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Help Me Get More From My Rb26!

groper

By groper,
in Engines & Forced Induction

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groper Explorer

groper

Posted
Posted

hi folks, have just aquired myself an r33 gtr which has been moderately modified and tuned, running 240awkw or 357kw at engine. i want to achieve 300-350awkw on stock internals.

the main mods so far-its running 19psi on stock turbos with steel wheels, big apexi fmic (125mm thick i think), power fc, stock fuel system, stock afm, big cold air intake with k/n filter, cam timing has been adjusted and a bunch of other supporting stuff like blasted intake manifold, oil cooler and catch cans etc etc...

it goes nicely but of course want more... from the tuners report/comments he says he has taken the engine to a point where the air flow meters and injectors are a problem if you wish to go for bigger turbos.

so, i want to get a pair of gt2860r or similar, turbos :D and want to make sure i have the other supporting stuff covered. the main question i have is about the airflow meters and what to do here? whats the problem with these and how best to overcome?

how many hp will the stock r33 gtr fuel pump handle and what size injectors should i go for keeping in mind my power goals?

do i need anything else apart from a tune once the above is completed?

cheers...

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Beer Baron Grand Master

Beer Baron

Posted
Posted

it's a simple (but expensive) step up from here as you are at (or near) the limit of a number of things. I would get the following:

a set of mild cams around 260degree 9.15mm lift

700cc injectors

nismo fuel pump

nismo or Z32 (VG30) air flow meters

some turbos. either R34 N1s, or HKS GT-SS or HKS GT2530 would be my pic, but the generic garret equivelant seems to be good too.

also upgrade the front part of your exhaust if not done already

that should see you somewhere between 300 and 340 wheel kw.

groper Explorer

groper

Posted
  • Author
Posted
it's a simple (but expensive) step up from here as you are at (or near) the limit of a number of things. I would get the following:

a set of mild cams around 260degree 9.15mm lift

700cc injectors

nismo fuel pump

nismo or Z32 (VG30) air flow meters

some turbos. either R34 N1s, or HKS GT-SS or HKS GT2530 would be my pic, but the generic garret equivelant seems to be good too.

also upgrade the front part of your exhaust if not done already

that should see you somewhere between 300 and 340 wheel kw.

ah yes, the exhaust has been done already, turbo back 3.5inch...

so the z32 are best replacement for the stock afm`s? there is 2 of them remember? i have been doing some more reading and it seems that the voltage is the problem??? or is it the diameter???

was gonna hold off on the cams, thought id get there without em? will i really need em to go over 300awkw?

one other thing, i think the tune is very rich as i get alot of soot on the back of the car from the exhaust? is this normal? i know its safer, but can you still have a safe tune without the soot?

Beer Baron Grand Master

Beer Baron

Posted
Posted

the problem with the afms is the calibration. not so much the physicaly size (unless you are running very big turbos, with a bit inlet).

yes I'm aware there is 2 afms. you need to reaplace your 2, with 2 new ones. personally I would chose the nismos as they are a Z32 sensor in an RB25 body which means they fit straight into your existing set-up. Z32s have a larger body so require some effort to fit them.

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