What turbo for 500-550bhp?
04-01-2009, 07:55 PM
#1
What turbo for 500-550bhp?
Which of the GT series turbo's is best to acieve 500-500bhp comfortably on a YB?
I'm tempted to go for a good old T4 but dont want it to be mega laggy as i'm led to believe they are.
What are the GT series turbo's like reliabilty wise compared to a T4 and would i have to have an external wastegated one to achieve this power?
How do they compare price wise also?
Sorry for all the questions but i want to decide on which turbo to go for before i have the head work done,
Thanks, Karl
I'm tempted to go for a good old T4 but dont want it to be mega laggy as i'm led to believe they are.
What are the GT series turbo's like reliabilty wise compared to a T4 and would i have to have an external wastegated one to achieve this power?
How do they compare price wise also?
Sorry for all the questions but i want to decide on which turbo to go for before i have the head work done,
Thanks, Karl
04-01-2009, 08:10 PM
#3
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Either the GT30 or the GT35.
just depends on what the rest of the engine is capable of, and which spec/variant of either of those turbo's you choose to go for.
just depends on what the rest of the engine is capable of, and which spec/variant of either of those turbo's you choose to go for.
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04-01-2009, 08:48 PM
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04-01-2009, 08:53 PM
#9
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Im am being real Rod.
There are no GT30 cars that went quicker than mine did.
What accelt figs are you on about?
The ones on the soaking wet freezing fog covered runway that I didnt get any grip til well into 4th gear?
04-01-2009, 09:11 PM
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This debate will rage for ages, T4 Vs GT30/35... some tuners prefer T4, some the GT series, and I would imagine it is SO dependant on engine spec what works best where it is a pretty open question really. Are there any alternatives like turbonetics etc that would fit between the T4/GT range?
04-01-2009, 09:15 PM
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04-01-2009, 09:26 PM
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I have seen lots of other tuners 500 ish engines on AVA rollers and none had the mid range of my engine.
Mine came on boost earlier despite being on low comp and pump fuel.
Mine came on boost earlier despite being on low comp and pump fuel.
04-01-2009, 09:27 PM
#15
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On a Std rear beam you hooligan
This debate will rage for ages, T4 Vs GT30/35... some tuners prefer T4, some the GT series, and I would imagine it is SO dependant on engine spec what works best where it is a pretty open question really. Are there any alternatives like turbonetics etc that would fit between the T4/GT range?
This debate will rage for ages, T4 Vs GT30/35... some tuners prefer T4, some the GT series, and I would imagine it is SO dependant on engine spec what works best where it is a pretty open question really. Are there any alternatives like turbonetics etc that would fit between the T4/GT range?
Never really did get round to upgrading that
Dave from PF has footage somewhere of me trying to get power down at Brunters.
04-01-2009, 09:51 PM
#16
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Turbonetics do a GTK-500 that would be interesting to see on a YB - would need an external wastegate though.
Alternatively - a GT30 and big boost should see that figure
Alternatively - a GT30 and big boost should see that figure
04-01-2009, 09:54 PM
#17
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I'm prob speaking out of turn here
but this is getting REALLY tedious! As soon as anyone mentions a fairly serious power figure, top speed or 1/4 mile time you're all over it like a rash. Take the recent 3 door top speed discussions and potential thrash for example!Yes, your car is quicker but so what? Euan has suggested what he feels is the most appropriate turbo for the job in hand, rather than just waving his willy around about how much he has spunked on a car that he's too scared of to even drive to its (theoretical) maximimum when its back together
!!!I've got loads of respect for what you and your car have achieved but just occasionally you could add some useful content, like, errr maybe what turbo you suggest as I'm sure you have had a 500 ish bhp engine at some point rather than pointing out that others are slower then you!
04-01-2009, 10:00 PM
#20
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so , what are people using at the mo for over 600bhp???
must be a few alternatives , what dose rod use , some of the scandanavians must have some different turbos????
must be a few alternatives , what dose rod use , some of the scandanavians must have some different turbos????
04-01-2009, 10:23 PM
#22
the norweigans and scandinavians use turbonetics t66's
but speaking to a well known tuner reecently whilst they all say t66 the housing and turbine blades have about 20 different combinations
so there all specced to suit the car ,
where as the garret and gt range are more foucsed to certain power levels , making it eaiser to spec a turbo for your desired power output ,
beef
but speaking to a well known tuner reecently whilst they all say t66 the housing and turbine blades have about 20 different combinations
so there all specced to suit the car ,
where as the garret and gt range are more foucsed to certain power levels , making it eaiser to spec a turbo for your desired power output ,
beef
04-01-2009, 10:40 PM
#23
Thanks for the replies people, which gt30 will do over 500bhp? I thought by other threads on here they were more of a 450-500bhp turbo (probably wrong though), the car will be a road car, not really interested in proving how fast it etc,
i want it to be as drivable as possible for a car with that sort of power and i'm not really chasing numbers if you know what i mean, dont want a really laggy, lazy engine that only makes the power high up the rev range, keeping as much torque as possible.
i want it to be as drivable as possible for a car with that sort of power and i'm not really chasing numbers if you know what i mean, dont want a really laggy, lazy engine that only makes the power high up the rev range, keeping as much torque as possible.
04-01-2009, 10:41 PM
#24
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the norweigans and scandinavians use turbonetics t66's
but speaking to a well known tuner reecently whilst they all say t66 the housing and turbine blades have about 20 different combinations
so there all specced to suit the car ,
where as the garret and gt range are more foucsed to certain power levels , making it eaiser to spec a turbo for your desired power output ,
beef
but speaking to a well known tuner reecently whilst they all say t66 the housing and turbine blades have about 20 different combinations
so there all specced to suit the car ,
where as the garret and gt range are more foucsed to certain power levels , making it eaiser to spec a turbo for your desired power output ,
beef
I know only one that's been running over 600bhp with Garrett.
Usually people change here Garrett to Holset around 400bhp.
I'm staying with Garrett on my update that is going on, either GT30 or GT35, trying to get up to 500bhp.
04-01-2009, 10:42 PM
#25
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go with the gt30 then mate
best for a quick spool up and still plenty of poke for a crazy fast car
unless your chasing numbers for the pub talk, then you'll be wantin the 35
best for a quick spool up and still plenty of poke for a crazy fast car
unless your chasing numbers for the pub talk, then you'll be wantin the 35
04-01-2009, 11:20 PM
#28
best thing to do is speak to the tuner thats going to map it mate then they will tell you the best solution of engine spec and turbo to go for i have never been in a gt30 motor but been in a t4 and when it spools up there is nothing like it imo
but T4 for me.....as i,m still in the dark ages
05-01-2009, 12:38 AM
#30
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Not forgetting that his car was running the small exhaust housing I seem to remember? Also he is on solids with cams to suit and 8200+ rev limit IIRC?
Turbo choice is so sensitive to the rest of the engine spec it really needs to be built as a package to work where/when you want it to.
Turbo choice is so sensitive to the rest of the engine spec it really needs to be built as a package to work where/when you want it to.
05-01-2009, 12:46 AM
#31
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well im going to have another engine built when i get my 500, and that will defiantly be running a roller bearing t4, the results speak for themselves, both Mike and Euan have proved that the T4 is still a wicked turbo.
05-01-2009, 06:09 AM
#34
PassionFord Post Troll
Same old argument.
Do you really think in 20 years and with a development budget of millions Garrett have been able to come up with anything better than a T4?? Of course the GT range are better.
Do you really think in 20 years and with a development budget of millions Garrett have been able to come up with anything better than a T4?? Of course the GT range are better.
05-01-2009, 07:05 AM
#36
PassionFord Post Troll
Better materials and machining that made better bearing options producable at reasonable production costs, advances in casting and materials that have allowed them to produce lighter and stronger turbine wheels.
Huge advances in CAD, FEA, and fluid dynamics that will have allowed Garret to model/design/optimise turbines and compressor wheels so that they have less inertia and better flow properties at all shaft speeds. FD will have also been used to optimise flow through turbine and compressor housings.
Huge advances in CAD, FEA, and fluid dynamics that will have allowed Garret to model/design/optimise turbines and compressor wheels so that they have less inertia and better flow properties at all shaft speeds. FD will have also been used to optimise flow through turbine and compressor housings.
05-01-2009, 07:28 AM
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Better materials and machining that made better bearing options producable at reasonable production costs, advances in casting and materials that have allowed them to produce lighter and stronger turbine wheels.
Huge advances in CAD, FEA, and fluid dynamics that will have allowed Garret to model/design/optimise turbines and compressor wheels so that they have less inertia and better flow properties at all shaft speeds. FD will have also been used to optimise flow through turbine and compressor housings.
Huge advances in CAD, FEA, and fluid dynamics that will have allowed Garret to model/design/optimise turbines and compressor wheels so that they have less inertia and better flow properties at all shaft speeds. FD will have also been used to optimise flow through turbine and compressor housings.
Be great to see a well specced engine push a GT30 (whatever sizes etc) and a T4 in back to back tests, no one has yet produced definative figures about whats better where
Some compressor maps:
T4 .60
T4 .57
Last edited by RWD_cossie_wil; 05-01-2009 at 07:35 AM.
05-01-2009, 07:42 AM
#40
Colossal Pervert
The GT3076 compressor map you posted shows the turbo is only happy flowing 500hp worth of air at about 1.6 bar of boost.. something which a YB isn't doing unless at very high engine speeds! Of course you can push the turbo past it's envelope...