Built Motor 32gtr + 34gtr Turbos

[Mike__]

Hey guys,

Posting this for my brother who also has a 32gtr. Has the following engine mods:

Built Motor: Forged pistons, ARP bolts, eagle rods, N1 oil/water pump, 33 crank, rebuilt head etc etc. Basically all the usual good bits

Turbos: Rebuilt R34 bb gtr turbos with N1 steel wheels

Exhaust: Upgraded Y piece with a 3" cat back. Dumps are stock

Atm boost is stock (~10-11ish psi judging by the factory gauge) whilst the motor is being worn in with only the boost restrictor removed & still retaining the OEM solenoid.

Fuel system is stock.

Looking at raising the boost shortly so my brother called a reputable tuner here in Perth. He suggested the following:

bosch 040 pump $500 installed

Greddy Profec B $550 installed/setup

Nistune $880.

+ Up the fuel pressure a little to achieve ~17psi reliably without having to go bigger injectors

Was thinking about purchasing the Nismo pump for $400 as its a straight drop in and setting up/ installing the profec B myself (done these before) to save a little $$$.

Questions are: is the volume of air produced by the 34gtr turbos greater than the stock 32's?

If we run 14-15psi without the tune would this be safe? Assuming the bigger fuel pump is in place

How much boost can these turbos produce whilst keeping in there efficiency & what would an approx power figure be?

Is it safe to up the fuel pressure a little for this application? Bigger injectors are a better choice but then + $800 for some sards which we'd rather avoid if not necessary

Thanx

Mike

[R31Nismoid]

N1 wheels in the front and rear? If so, 20-24psi is what most run being they arent ceramic.

Basically the same as -7 or GT-SS

Might not get there with just rail pressure as personally i wouldn't push R32 GTR injectors harder than factory pressures.

They are 15 years old and could fast become a weak link that could result in a pretty nasty death

With a tune, should be a nice 300-330rwkw car if you get injectors, VERY fast streeter.

[Mike__]

Thanx for the fast reply.

The receipt says R34 BB gtr turbos. Rebuilt with N1 steel wheels (exhaust). Previouis owner said the compressor is standard. Would N1 steel wheels fit the stock housing? Or is the housing changed. Arnt the compressor wheels steel from the factory & turbine ceramic?

Yeh should go nicely. Atm is slower than mine: stock with 14psi & cat back, but thatllm change.

thanx for the advice

N1 wheels in the front and rear? If so, 20-24psi is what most run being they arent ceramic.

Basically the same as -7 or GT-SS

Might not get there with just rail pressure as personally i wouldn't push R32 GTR injectors harder than factory pressures.

They are 15 years old and could fast become a weak link that could result in a pretty nasty death

With a tune, should be a nice 300-330rwkw car if you get injectors, VERY fast streeter.

[ali-turko]

no they usally bore the housings out the fit the larger wheels,

and if you are 110% certain there steel wheels they can handle more then 15psi, probably 20-25psi

[Mike__]

Guys,

Just read the receipt myself again. They dont say N1 steel wheels, just converted turbines to steel wheels. Sorry.

How much then would these turbos pump out efficiently?

thanx

Mike

Edited March 25, 2008 by Mike__

[R31Nismoid]

270/280 or so i'd imagine direct replacement... on around 18-20psi

[Mike__]

270/280 or so i'd imagine direct replacement... on around 18-20psi

Thanx Nismoid. Was about to post another reply as i just found the answers i was looking for in 2 threads on stock size steel turbines vrs N1 specs from 06 & 07 with your replies. Your info was consistant . Should have searched a little longer be4

Mike

Edited March 25, 2008 by Mike__

[R31Nismoid]

No worries mate, most of my replies generally wont change unless new info/development comes to light from myself or other users and so on that i've seen

Happy to help where i can