New Supra project

[jamiep]

Turbo T said:

It will be nice when it's done Jamie, at the moment it's not a patch on the black one to drive. I will have a play with the map over the weekend if I get the chance.

GT 4088 looks a nice tubby... who would i speak with regarding getting one of them?

[Turbo T]

Moi

the silencers arent Burns ones, Burns are the back box that BL use

[jamiep]

Turbo T said:

Moi

the silencers arent Burns ones, Burns are the back box that BL use

Sort me a price and how quick you can get me one please mate.. [e-mail]

[Turbo T]

For reference Jamie I can get cracking prices on T67DBB at the moment

[Turbo T]

GT42R - depends on the trim. The comp wheels are roughly 70mm, 74mm & 76mm. Power aywhere from 750-950+bhp. Full boost anywhere from 4500-5400rpm

T71GTQ/S - Q outspools S trim by a bit, but S makes more power. Max 800bhp. Full boost approx 4400-4600 rpm

GT4088R - Max power about 700 bhp. Full boost approx 3700 rpm
T67DBB - Max Power about 720bhp. Full boost approx 3800 rpm

all the above are approx and from experience. All based upon race fuel. Road fuel the smaller turbos are a better bet as the are in their efficiency range.

[identti]

Does the number after the T in Txx turbo's equate to the exducer or inducer diameter of the compressor?

I know on the garretts the GTyyxx, the xx stands for the exducer (larger size) of the compressor wheel. Does this mean that your GT4088R is larger or smaller than a T71/4?

[Turbo T]

No one makes it easy TBH.

with Garrett, the first number eg GT40 is the frame size/range, the second eg the 88 is the compressor wheel exducer size so 88mm. The R denotes DBB cartridge. On top of that there are various trim options

The Precision turbos, use the compressor inducer size to name them, eg a T71 is a 71mm compressor inducer. The Q, S etc is the exhaust wheel type. So a Precision T71 is a fair bit bigger than a Garrett GT4088R

Then you get GReddy who's T78 & T88 have 66mm compressor inducers. Whether they have 78mm & 88mm compressor exducers I don't know, never bothered to check.

Hope that helps

Edited by Turbo T on Friday 20th October 21:52

[jamiep]

Turbo T said:

For reference Jamie I can get cracking prices on T67DBB at the moment

Yea homer was telling me...sounds good
I cant make my mind up what to go for... as per the thread on mkiv.net im thinking maybe a T71GTS now.

[Turbo T]

It wont spool that much faster than your T88 mate. 2-300 rpm tops

[jamiep]

Hmmm... do you think id be happy with a T67dbb?

[Turbo T]

I honestly dont think a T67 will make much less power than a T88 on pump fuel. The bigger turbo's only really start coming into their own with huge boost. I would definitely be a lot more fun to drive.

[jamiep]

Damm this turbo stuff is so confusing...ok let me think and ill call ya next week... thanks for the advice mate

[Turbo T]

NP. One thing I would say is you need to ensure the DBB's are installed correctly. We've never lost one, but it's easy to feck up the install if not careful.

[jamiep]

Noted and good luck with the new motor

[identti]

Turbo T said:

No one makes it easy TBH.

with Garrett, the first number eg GT40 is the frame size/range, the second eg the 88 is the compressor wheel exducer size so 88mm. The R denotes DBB cartridge. On top of that there are various trim options

The Precision turbos, use the compressor inducer size to name them, eg a T71 is a 71mm compressor inducer. The Q, S etc is the exhaust wheel type. So a Precision T71 is a fair bit bigger than a Garrett GT4088R

Then you get GReddy who's T78 & T88 have 66mm compressor inducers. Whether they have 78mm & 88mm compressor exducers I don't know, never bothered to check.

Hope that helps

Edited by Turbo T on Friday 20th October 21:52

Yep, that helps a lot. Silly that their isn't a standard convention though - it's very hard to compare sizes this way.

[Turbo T]

identti said:

Yep, that helps a lot. Silly that their isn't a standard convention though - it's very hard to compare sizes this way.

Yeah but then punters could make informed decisions, and that would never do

[jamiep]

Terry what do you think of the HKS T51 kai? i know a guy with one on a supra and he tells me it starts making boost by 2000rpm and hits full boost at 4200rpm.

[Turbo T]

it's basically a GT42R. I think the KAI version is the 70mm one so GT4294R.

Be careful when listening to people talk about their own turbo's, most tend to exagerated. Also it may have been in 6th gear up a hill, the higher the gear the more load, the sooner you will generate boost. I have a datalog of my black car hiting 20psi @2800 rpm, but that was in 6th

Edited by Turbo T on Saturday 21st October 20:18

[jamiep]

ahh i see

[jamiep]

edit... submited by mistake

Edited by jamiep on Saturday 21st October 20:53