Definitive Guide To Building 300-330awkw Gt-r

[MrStabby]

-7s being a tad more responsive again (over -9) would be an excellent choice if response is your #1 goal.

FYI, here's stock vs -7 boost response (very few data points.....its rough) same engine and probably same cam timing.

[piranha]

Hey guys quick question.

I'm going from bathurst turbos to -7s.

Will I need oil restrictors for ball bearing turbos?

Cheers

[Harey]

FYI, here's stock vs -7 boost response (very few data points.....its rough) same engine and probably same cam timing.

I thought N1 turbos were different to -7 turbos?? The legend on your graph says N1 whereas your text says -7. I thought -7 were a lot more responsive then N1.

[R31Nismoid]

R34 N1 are not the same laggy POS that R32/R33 N1s are.

[piranha]

Do R34 N1s require an oil restrictor for the turbos?. They are going on a 32 gtr if its any different

[85URK]

Hey guys, great thread, some useful information in it.

i am slowly working on my car to achieve just this set up 300awkw

at the moment, i have just installed

GT2860-7 x 2 turbos

Tomei expreme dump pipes

already has a front pipe, and a hks preist cat back with a high flow 3" Catco cat. (looking at changing exhuast to one with a bit louder/better flow) any suggestions?? rear cannon style.

i have a vipec ecu (which i need to get retuned but going to wait till after mods) MAFless

it has pump incar already, so that is a non issue.

suspension is all done.

i am at the stage of buying injectors, i have been looking at seimens injectors, can anybody give me some info on which type to run if they know about seimens injectors? part numbers etc, im looking at about the 600cc mark for injectors

Also never really though about cam gears, but might also look into those b4 retune.

Cheers

Daz

[SiR_RB]

ive got very similar mods to urs Daz.

im running 600cc nismo injectors with a sard intake fuel pump with a direct 14v power supply.

im also running GReddy cam gears, i think they are great on an RB26. they gave me more flexability when it came time for tuning. ie i had a choice between getting them tuned for outright power or sacrifice abit of top end for more midrange power/torque

[Piggaz]

ID 1000's. Done. My ID 2000's idle and drive better than my SARD 800's. Very happy with them!

[N1GTR]

ive got very similar mods to urs Daz.

im running 600cc nismo injectors with a sard intake fuel pump with a direct 14v power supply.

im also running GReddy cam gears, i think they are great on an RB26. they gave me more flexability when it came time for tuning. ie i had a choice between getting them tuned for outright power or sacrifice abit of top end for more midrange power/torque

Whats your max injector duty? What power is it making and what boost is that at?

+1 on cam gears

[SiR_RB]

Not sure on injector duty, il have to find that out

296kw @ 19psi - cam gears adjusted for midrange, feels so responsive And just screams out of corners like a mofo I'm happy with it 100%

[R31Nismoid]

Duty couldn't be too high with 600s, im running 700s and only seeing max of 65% @ 350-360rwkw. Has a minor rail pressure bump so move it to 70-75%

600cc @ 300rwkw, rough stab would be 55-65%?

[J - Rad]

Had a good read of this thread before I started my round of mods for 300kw. My mods so far are

2860-9

Nismo 600cc

New PFC

HKS cam gears

Greddy dump/front pipe extension

Kakimoto Regu exhaust

Splitfire coil packs

Hasn't been tuned yet because of coilpack and EBC issues. But I'm hopeful I'll get close to cracking the 300 mark but at this stage I just want it tuned and running

[levinboy]

Currently running -9s with 335kw, nismo 600cc injectors and fuel pump, with a max injector duty cycle of 86%

Just for reference

[Don Dada]

Time and time again I see ppl try to estimate duty cycle in relation to power output but it seems like we are leaving out the most inportant fator which is afr.

A car with 600cc making 300rwkw tuned at 11.0afr will show higher duty cycle than if it was tuned to 12.0afr and making the same 300rwkw.

[Rolls]

and if it made that power at 9000rpm vs 5500rpm it would be a huge difference as well.

[linkems]

Can any one explain why my boost curve is fluctuating, at a glance i'd guess some sort of fuzzy logic function however im pretty sure the blitz spec r are theoretically just an open loop controller with simple duty cycle adjustment. The car is running the standard 8psi actuators on dash 7s and the blitz boost controller set to 86. When i eventually fit bigger dumps (i have stock 32), bigger afm and retune on e85, i'd like to run more boost. Is it worth while upgrading to 14psi actuators?

Cheers

Pat

[R31Nismoid]

Time and time again I see ppl try to estimate duty cycle in relation to power output but it seems like we are leaving out the most inportant fator which is afr.

A car with 600cc making 300rwkw tuned at 11.0afr will show higher duty cycle than if it was tuned to 12.0afr and making the same 300rwkw.

No different to estimating a dyno figure range or RPM turbos will come on.

There are always variables, however you can work out 'roughly' in most cases, hence its called an estimate...

[smithy85]

Currently running -9s with 335kw, nismo 600cc injectors and fuel pump, with a max injector duty cycle of 86%

Just for reference

What air flow meters are using to get up to that figure? Are the standard still coping or have they been changed to Nismo or Z32?

My car is getting tuned in just under two weeks with -9s and 720cc injectors so i'm thinking the AFM's are going to be the next limiting factor.

[R31Nismoid]

AFM's max out around the 300rwkw mark (+/- 15kw, all cars are different). You can tune past them if you wish, mine were.

Tune needs to be spot on however to accommodate this.

[N1GTR]

MAFless ECU's - win