Question For The Turbo Guru's ***pics Added***

[discopotato03]

Those results follow the usual trends , larger A/R turbine housing uncorks the hot side of the engine pressure balance equation and you often end up with the same power at lower boost pressure .

This is a good example of increasing the gas flow by removing a restriction , it also means lower charge air temps and lower fuel rail pressure so mostly good . The only downside is that the turbine spins up later in the engines rev range because the larger turbine housing passage means low gas velocity through the turbine housings nozzle until the engines revs climb a little higher .

Actually I always wondered what a GT3076R would be like with a 1.06 A/R GT30 turbine housing but its not a combination any ones tried as far as I know .

Throttle vs boost response works really well with larger A/R twin scroll housings but until Garrett gets the lead out and makes twin scroll twin integral gate turbine housings like IHI and a few other manufacturers do don't hold your breath .

Very interested to see how that real GT3071R 0.63 A/R build goes .

Noise , yep nearly always goes up because there is less pulse damping between the exhaust valves and the turbine housings nozzle .

Cheers A .

Edited March 1, 2008 by discopotato03

[Shaun]

yep,

I did the same conversion on an Rb26 with the same turbo. I just drove the car for the first time with the 1.06 turbine housing and its heaps louder. Actually, i dunno if i can live with it with the trust 3.5 inch exhaust. I also found that the turbo performs like a light switch; its nothing, nothing, nothing, then wheel spin. I love that banshee wastegate scream though!

Shaun.

[Guilt-Toy]

yeah its definatly much more agressive thats for sure

yep,

I did the same conversion on an Rb26 with the same turbo. I just drove the car for the first time with the 1.06 turbine housing and its heaps louder. Actually, i dunno if i can live with it with the trust 3.5 inch exhaust. I also found that the turbo performs like a light switch; its nothing, nothing, nothing, then wheel spin. I love that banshee wastegate scream though!

Shaun.

[SirRacer]

Sorry to dig up an old thread, but has anyone else since done this swap?

Really keen on getting some more information on it as im considering doing this at the moment. Id also be interested in seeing how much peak power increased by.

[discopotato03]

Turbine map for GT3582R/GT3540R .

Yep the 1.06 is quite a jump over the 0.82 , if you can look down the passages from the mount flange side with a torch the difference is very obvious .

http://www.turbobygarrett.com/turbobygarre...8-allturb_e.jpg

Cheers A .

[Guilt-Toy]

my power went from about 350rwkw to 380ishrwkw from the turbo upgrade.

[Brockas]

my power went from about 350rwkw to 380ishrwkw from the turbo upgrade.

Do you have a graph to compare boost response?

Sounds like it makes the car a lot less linear.

ps. I have a spare 1.06 rear for a GT35 if anyone wants it cheap....

[SirRacer]

That graph shows a hell of a lot more flow A so cheers.

GT, how did the thing feel? For someone like me who isnt going to use the car for drifting is it a worthwhile update? The 30kws comment is definitley encouraging as im going to use the car for drag racing primarily and that will make a big difference but dont want the thing to be too much of a dog to drive. You dont have any dyno charts do you?

Did you notice any boost control differences, as im having massive issues with my 44tial on the .82?

Brockas, cheers for the offer. Im in NZ and sending a housing may be a tad expensive.

Edited April 30, 2009 by SirRacer