Turbos.. T4 vs GT35
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My car runs a t4 turbo at the moment and its fine, Good power delivery, not too laggy and works quite well
But it is pretty much too its limits. The engine and pretty much everything else is uprated for more power and ive been thinking about going to an externally gated gt35
and i wondered if any one had any comparrisons between the two turbos i.e. would the gt35 be hurrendously laggy compared to the t4 and would it still be as nice to drive from day to day
Thanks in advance and your opinions are most appreciated
Steve
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Thanks in advance and your opinions are most appreciated
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Steve
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personally i'd stick with the T4...maybe have it modded for a bit more power...maybe even go external wastgate on it
GT35 is huge though really...i'd have thought one of the larger GT30 variants would have been more suited...unless you're just maddddddd
will you be out in it on Tuesday night at the BCRSOC meet? if so i'll see you there
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GT35 is huge though really...i'd have thought one of the larger GT30 variants would have been more suited...unless you're just maddddddd
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will you be out in it on Tuesday night at the BCRSOC meet? if so i'll see you there
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Originally Posted by Porkie
Why do you need more than 500bhp in a day to day road Cossie !?!?!? ![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
What gearbox and diffs you running matey?![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
What gearbox and diffs you running matey?
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And why need more power?? dont really know just thinking through a few options
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Steve
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Originally Posted by bud-weis
personally i'd stick with the T4...maybe have it modded for a bit more power...maybe even go external wastgate on it
GT35 is huge though really...i'd have thought one of the larger GT30 variants would have been more suited...unless you're just maddddddd
will you be out in it on Tuesday night at the BCRSOC meet? if so i'll see you there
![Banana](https://passionford.com/forum/images/smilies/banana_dance.gif)
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
GT35 is huge though really...i'd have thought one of the larger GT30 variants would have been more suited...unless you're just maddddddd
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
will you be out in it on Tuesday night at the BCRSOC meet? if so i'll see you there
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
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Yes mate, hope to be
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#6
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GT35 is quite a vague description, so lag etc is going to vary depending on the trim of the blades and the AR of the housings etc
But basically a GT35R will not be any laggier than a T4 as a general rule of thumb.
As above though, a GT30 woudl give you the power you have now but with more punch delivering it
But basically a GT35R will not be any laggier than a T4 as a general rule of thumb.
As above though, a GT30 woudl give you the power you have now but with more punch delivering it
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Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
At 8000rpm mine does 70mph in 1st gear and 100mph in 2nd and only 170mph in 5th
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Originally Posted by Chip-3Door
GT35 is quite a vague description, so lag etc is going to vary depending on the trim of the blades and the AR of the housings etc
But basically a GT35R will not be any laggier than a T4 as a general rule of thumb.
As above though, a GT30 woudl give you the power you have now but with more punch delivering it
But basically a GT35R will not be any laggier than a T4 as a general rule of thumb.
As above though, a GT30 woudl give you the power you have now but with more punch delivering it
Ill try and get some more info as ive been offered a deal on one with my T4
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Originally Posted by Chip-3Door
Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
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So if i lauch at 5k, to the red line, change up to second - where's the lag?
I i sit there cruising in 5th at 2k then floor it, course they'll be lag FFS. So changing down the box will get me back on song will it not?
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Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
Thanks
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#13
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Originally Posted by Franco
Originally Posted by Chip-3Door
Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
So if i lauch at 5k, to the red line, change up to second - where's the lag?
I i sit there cruising in 5th at 2k then floor it, course they'll be lag FFS. So changing down the box will get me back on song will it not?
If you are doing 2k in 5th, change down and then floor it, then where the lag is, is the time it then takes the turbo to spool up at 4000rpm in 3rd (or whatever the actual rpm works out at on your particular box)
you seem to be somewhat confused between the term "lag" and "boost threshold"
Boost threshold is the places within the rev range the engine is capable of spooling the turbo, lag is how long it takes to do so once you are in that threshold.
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Originally Posted by Porkie
Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
Thanks
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
I ship shit across the world, not build engines!
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#15
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Originally Posted by Porkie
Originally Posted by Franco
Why oh why do people bang on about lag, lags only an issue when you're too lazy to change gear's! ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Anyway this new T4 Euans testing might cure some of the response issues
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
Thanks
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
So much more sensible a reply than even having a go to try and explain it like I did, I really shouldnt bother!
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Originally Posted by Chip-3Door
Originally Posted by Franco
Lag, boost threshold...........yadda yadda yadda! ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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Its like trying to explain calculus to some elephants
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Anyways now we cleared that up, surely if the gear change keeps you in the Boost threshold the lag isn't going to be THAT noticeable on a well specced engine.
(PS Fuck off Lee!!
My mums food mixer is massive!).
PS i hear loads of people have/are downgrading from a 35 to a 30, so there's obviously something amiss with them.
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(PS Fuck off Lee!!
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PS i hear loads of people have/are downgrading from a 35 to a 30, so there's obviously something amiss with them.
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Originally Posted by Franco
Anyways now we cleared that up, surely if the gear change keeps you in the Boost threshold the lag isn't going to be THAT noticeable on a well specced engine.
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Originally Posted by Franco
PS i hear loads of people have/are downgrading from a 35 to a 30, so there's obviously something amiss with them.
Just like people going for 350bhp dont tend to use a T4, because its laggier than a T34
#24
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Steve,
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
), which will shift 4lb of air more than the one you have at the moment. Good for 550+bhp with a correctly specced engine
.
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
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he's just being a girl, not even driven the car properly since he's had it mapped
is bizzare doing 100MPH in 2nd though
Just keep your cash in your pocket and enjoy the car for once mate, Once the rear beam is sorted and you can launch it properly 0-100's and 1/4's are going to be seriously seriously mental
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Just keep your cash in your pocket and enjoy the car for once mate, Once the rear beam is sorted and you can launch it properly 0-100's and 1/4's are going to be seriously seriously mental
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Originally Posted by Mike Rainbird
Steve,
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
), which will shift 4lb of air more than the one you have at the moment. Good for 550+bhp with a correctly specced engine
.
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Grin](https://passionford.com/forum/images/smilies/icon_smile.gif)
Mmmm interesting.. Whats involved in changing the compressor?? and roughly how much to get it done??
Steve
#27
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Originally Posted by 4x4 ste
Originally Posted by Mike Rainbird
Steve,
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
), which will shift 4lb of air more than the one you have at the moment. Good for 550+bhp with a correctly specced engine
.
You certainly won't be able to have the ALS on the GT35 like you have on the Mar-M shafted T4 you currently have. If you want more power, why not upgrade your T4 that you have with the larger compressor (this is what I did and tested the turbos back to back
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Grin](https://passionford.com/forum/images/smilies/icon_smile.gif)
Mmmm interesting.. Whats involved in changing the compressor?? and roughly how much to get it done??
Steve
#28
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If your Tuner is able to correctly Spec your engine to get a GT35 working without surge its on a different planet to the T4. My 630bhp conversion was much more drivable & with less lag than the T4 inspired 500bhp engine. It was the ultimate squirt & go machine for the road.
Rod
Rod
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Originally Posted by MadRod
If your Tuner is able to correctly Spec your engine to get a GT35 working without surge its on a different planet to the T4. My 630bhp conversion was much more drivable & with less lag than the T4 inspired 500bhp engine. It was the ultimate squirt & go machine for the road.
Rod
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My dad reckons you only learn from asking stoopid questions!
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Originally Posted by Franco
Originally Posted by MadRod
If your Tuner is able to correctly Spec your engine to get a GT35 working without surge its on a different planet to the T4. My 630bhp conversion was much more drivable & with less lag than the T4 inspired 500bhp engine. It was the ultimate squirt & go machine for the road.
Rod
Rod
Because according to all the other gimps, i'm an elephant!
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
My dad reckons you only learn from asking stoopid questions!
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
I didnt see Rod saying his car had NO lag, merely that it was better than what other tuners did and so made a fantastic compromise between out and out power, and power delivery.
Mark still obeys the laws of physics, but he does seem to do a good job of bending them a little sometimes
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#31
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People seem to underestimate the GT30.
I'm running a GT30 hybrid core in a standard bolt on fit (yes you heard lol) housing on my Sccob currently. 1bar at 2700-2800rpm, full boost (1.5bar) at 3000rpm. 480bhp @ Fly at only 1.38bar boost (was on a hub dyno the other day and got 395 ATW) due to not having a strong enough actuator. This core will run 2bar all day, go figure what it would be capable of at this boost level (it made just under 400bhp at 1bar).
I am about to bang a different core in (but still a GT30 hybrid) and wind the boost up. The aim is to have the same response as present and make about 550bhp on pump fuel...... this will still be using a GT30 type core.
Plenty of life in a quick response GT30 Hybrid turbo me thinks.
I'm running a GT30 hybrid core in a standard bolt on fit (yes you heard lol) housing on my Sccob currently. 1bar at 2700-2800rpm, full boost (1.5bar) at 3000rpm. 480bhp @ Fly at only 1.38bar boost (was on a hub dyno the other day and got 395 ATW) due to not having a strong enough actuator. This core will run 2bar all day, go figure what it would be capable of at this boost level (it made just under 400bhp at 1bar).
I am about to bang a different core in (but still a GT30 hybrid) and wind the boost up. The aim is to have the same response as present and make about 550bhp on pump fuel...... this will still be using a GT30 type core.
Plenty of life in a quick response GT30 Hybrid turbo me thinks.
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#32
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Ste, why not speak to Karl about how you want the car to drive and get him to supply the exact spec turbo for your engine.
Surely he will be adjusting the map to suit the new turbo?
What does he suggest?
Surely he will be adjusting the map to suit the new turbo?
What does he suggest?
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Originally Posted by Stu.H
Ste, why not speak to Karl about how you want the car to drive and get him to supply the exact spec turbo for your engine.
Surely he will be adjusting the map to suit the new turbo?
What does he suggest?
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
Surely he will be adjusting the map to suit the new turbo?
What does he suggest?
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
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The car is awesome as it is and i need to learn the car as it is first and just looking at options for the near future.
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I cant believe you want to change the turbo spec already.
I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
Looks like were having another trip to Blackpool then mate.
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I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Looks like were having another trip to Blackpool then mate.
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#35
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Originally Posted by Chip-3Door
I didnt see Rod saying his car had NO lag, merely that it was better than what other tuners did and so made a fantastic compromise between out and out power, and power delivery.
Change down a gear then!
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Obviously to us mere mortals, we'd probably never notice a issue with a well specced engine
Originally Posted by Chip-3Door
Mark still obeys the laws of physics, but he does seem to do a good job of bending them a little sometimes ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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#36
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Originally Posted by boosthappy1
I cant believe you want to change the turbo spec already.
I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
Looks like were having another trip to Blackpool then mate.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Surprised](https://passionford.com/forum/images/smilies/shocked.gif)
I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Looks like were having another trip to Blackpool then mate.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Surprised](https://passionford.com/forum/images/smilies/shocked.gif)
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
![Banana](https://passionford.com/forum/images/smilies/banana_dance.gif)
![Banana](https://passionford.com/forum/images/smilies/banana_dance.gif)
![Smokin](https://passionford.com/forum/images/smilies/icon_smokin.gif)
#37
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Originally Posted by 4x4 ste
Originally Posted by boosthappy1
I cant believe you want to change the turbo spec already.
I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
Looks like were having another trip to Blackpool then mate.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Surprised](https://passionford.com/forum/images/smilies/shocked.gif)
I thought that 37 psi on a T4 with ALS and LC would of kept you
amused longer than a week.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Looks like were having another trip to Blackpool then mate.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Surprised](https://passionford.com/forum/images/smilies/shocked.gif)
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
![Banana](https://passionford.com/forum/images/smilies/banana_dance.gif)
![Banana](https://passionford.com/forum/images/smilies/banana_dance.gif)
![Smokin](https://passionford.com/forum/images/smilies/icon_smokin.gif)
I can imagine Stu and Comedy Dans faces as they think to themselves.............Oh no not these Brummie cooonts again.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#38
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would be interesting to be able to drive a few different cars with differenty specced engines and turbos to see how thy compare.
Most people on here can only really comment on their own car.
One thing I can remember is Mark telling me that he can make a GT30 respond like a t34 and make a GT35 respond like a T4.
he also said that a GT35 is good for about 100 bhp more than a T4.
Most people on here can only really comment on their own car.
One thing I can remember is Mark telling me that he can make a GT30 respond like a t34 and make a GT35 respond like a T4.
he also said that a GT35 is good for about 100 bhp more than a T4.
#39
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![Default](https://passionford.com/forum/images/icons/icon1.gif)
Originally Posted by rapidcossie
would be interesting to be able to drive a few different cars with differenty specced engines and turbos to see how thy compare.
Most people on here can only really comment on their own car.
One thing I can remember is Mark telling me that he can make a GT30 respond like a t34 and make a GT35 respond like a T4.
he also said that a GT35 is good for about 100 bhp more than a T4.
Most people on here can only really comment on their own car.
One thing I can remember is Mark telling me that he can make a GT30 respond like a t34 and make a GT35 respond like a T4.
he also said that a GT35 is good for about 100 bhp more than a T4.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
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#40
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[quote="rapidcossie"]would be interesting to be able to drive a few different cars with differenty specced engines and turbos to see how thy compare.
Most people on here can only really comment on their own car.
quote]
You can drive mine if i can drive yours.
Most people on here can only really comment on their own car.
quote]
You can drive mine if i can drive yours.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)