I'm going to be changing turbo in a few weeks time, i've chatted with my mapper and we've discussed the options, but i'm unsure which one to go for i 'll be tracking the car only a few times it's mainly road use really....

Any advice please folks, who's running a GT30 and how are you finding it etc?? are they as STRONG as the T4?? What's the spool up like on the GT30?? ETC..

Dicisions...

 

The T4 is a massively strong turbo, very rare to have a problem with one and ultimatly has the ability to make more power than the gt30 unless you go for externally gated ect. Also if you have a l8 ecu why not get the msd mild anti lag would be fine on the T4 and just transforms the car


Steve

 

GT30 spins up quicker because it is a desiel turbo
Ahmed said they can make a T4 less laggy than my T34.63
Ask your tunner not this if he dont like it he will tell you why and what to do !!

 

Steve, i've got the L8 fella, getting a set of 1000cc injectors, just can't make my mind up over the turbo..

 

Then its got to be the T4 with Launch control and anti-lag then mate you know it make sense

Steve

 

I can't see why a T4 would take anti lag any better than any other turbo if it doesn't have a 247 shaft in it

 

Because the center core and bearings in the gt30 are different i think this is what helps it be less laggy but not sure

Steve

 

Ahmed worked wonders on my car, the turbo comes in so much earlier and is loads nicer to drive.

Staffi i would talk to your mapper and tell him what you want from it from eg. power, drivablitiy, lag, how much you will track it etc. They should then be able to recomend what turbo to use.

 

Oh yeah and you can rebuild a T4 for pretty much peanuts compared to having to buy a new gt30 everytime it expires

Steve

 

You didn't like my T4 mate...

The middle ground is the GT30 I think..... you should hopefully get the best of both worlds...

Jake

 

IIRC The GT series turbos weakness is the roller bearing if your using anti lag.

Heat is an issue on ANY turbo and this is why they use the Maram 247 shaft for anti lag applications.

I don't think the T4 on a RS500 would take anti lag any better than a T34 would tbh.

Ofcourse I could be totally wrong but I'm guessing no turbo came with a 247 shaft as standard so really anyone using anti lag on their turbo is playing with fire unless they have upgraded.




Whilst on this subject, a 247 shaft is LH thread yeh ? I have recently read about a guys evo on our forum and it has a Inconel RH thread shaft in his turbo, now I have a good idea why its RH thread but can someone give me a correct answer as I dont want to say what I think just yet

 

what the FUCK are you on about

there some properly retarded comments about turbos on here, people believe anything they get told, even people youd think would know better

 

Staffi...it really depends what GT30 you would use? Some should be good for alot more power than a T4 and some are around the same.

The all should more resposive than a normally set up T4 BUT there are ways and means to improve response on a T4.

My T4 is as resposive as a T38 is and Im sure Mike R's T4 was even more responsive again.

Im trying another type of T4 on my car as we speak so should have results from that very soon.

 

That is a classic comment

I'm also sure Ahmed didn't say that either

 

dont diesel make clothes? not GT30s's

 

Just popping down Topman to pick a up a GT35, anyone want one ?

 

make mine an XXL

 

GT42 it is then

 

Jake, yes mate i must admit the lag issue was a little disappointing with the T4 what boost was yours running the mate??





Think i may opt fot the GT30, I know a few of the Evo guys run them with good success and like i said, it's mainly for fast road really..



Cheers for the comments people, appreciated..




Euan, when are you testing this new turbo then??

 

staffi i always thought t4 = loads of lag untill i actually bought one and put it on my saff the only time its really bad is in 5th gear at about 60-70 its takes a while to pick up.

apart from that its spot on and the car drives so much smoother than it did with the t34

 

Dicko&Sarah

there are a few people thing tha tthey are laggy but until you have been in one there not that bad, depending on the set up of course.

 

my rs500 with the t4 was excellent once set up by kenny/stu.

you know you want to.....

 

i remember rainbird saying something along the lines of one of the bearing cages in a gt30 been made of plastic this is why it has to be water cooled and also not be ran with anti lag

 

next week

 

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Are you sure you want one..

 

hi euan


if you bring the t04 turbo in early say it's making boost @ 3500k then the turbo @ 7k would be running out of puff
the t04 only has a 3.5k power band where the gt30 has a 5k power band


marco

 

Surely that only applies to a normal T4 ? not one that has been altered ? or am I talking shit ?

 

jonny

that applys to any old garret turbo that the cossies have

they have only got 3.5k power band

so what ever they "come in at" after 3.5k that they are dead


my t34 came in at 3k it was flat out at 6.5k

same thing if you put a .48 housing on that t34 it will come in quicker but tails off quicker aswell because of the power band

you cant have both ...


marco

 

You learn something new everyday

 

Marco, have you a GT30 on your 3dr now then??

 

Thats not correct Marco.

Mines makes full 2.6 bar at 4k and power is still increasing at 8k rev limiter

 

fookin hell Euan, that's serious mate, pulling all the way to the 8k, bet yours is LIVELY in the wet then..

 

I bet is 'LIVELY' enough in the dry mate

 

TBH mate I couldn't see how that was right, I've seen enough dyno plots to show that doesn't totally ring true.

2.6 bar @ 4k must be ballistic, I so don't need that in a mk2 escort lol

A T4 can surely be altered in quite a few ways which is obviously how you and others get the results.

 

Euan, that's 38psi @ 4k..............

 

Pretty similar to my 3 door god i miss it sometimes

 

Give me 2 secs and ill get my boost graphs up

Staffi My turbo ran that for a year and when stripped for check over it was spot on.

T4s are strong

 

Wasn't that on a standard gearbiox and diff too

 

Because his turbo spins 'backwards' compared to our Cossie ones