Stage 2 Mods - R33 Rb25det

[benl1981]

Ok.

Currently have:

PFC + 10psi + R34SMIC + 3" turbo back exhaust (not split dump)

This with a tune gave me 172rwkw with a nice smooth power delivery. (dyno is meant to be conservative also)

I have sourced a GCG high flow turbo. I'm thinking that 220-230rwkw will be adequate for me.

I'm wanting to hold a fairly tight budget.

I have a nissan patrol clutch - hopefully that will hold up.

So extra mods to reach the 220-230rwkw??

1. FMIC - Hopefully the same sided entry type, to allow easy fitting

???2. Injectors?? - I think the stockies will be at around 90% duty cycle at this power level?? - from peoples experience would this be ok? I know you can get a rising rate fuel reg but think this may be a pain to play with..I guess S15 injectors are an alternative

?? 3. Fuel pump - my stock one showed no signs of fading out up high in the rev range. can 230rwkw be had out of the standard pump? Is a 2nd hand R33/34 GTR pump a direct fit and much better?

Will I need around 15psi to get this power level? I would like to avoid adjustable cam gears and replacing the exhaust. Would a split dump really be required. I have a 3" bell mouth type..

Thanks for your help.

I assume 220-230rwkw would be a fair improvement - without the worry of the turbo wheel spinning off..

Edited February 4, 2007 by benl1981

[QRI05E]

If you currently have a PFC + Boost controller + Full 3" exhaust +GCG high flow... you need:

- Split dump/screamer front pipe (10 - 15rw/kw gain over 3" bell mouth)

- Z32 AFM

- Deatschwerks 555cc injectors ($555 delivered)

- Walbro intank pump ($300 supply & fitted) or Nismo/Tomei ($370)

- CRD/Just Jap FMIC kit ($350)

If your engine & turbo are healthy + decent tune then you should be seeing 240 - 260rw/kw

Cheers

[nizmo_freek]

FMIC: If you want to keep with "same sided entry type" i would suggest going for a Blitz LM fmic kit from nengun, they use the stock return pipes, i think they cost somewere around $1000 which is about twice the price of a cheap chinese intercooler kit which would problly do the same job as the blitz kit.

Injectors: The stock 370cc injector have been used for a few 230rwkw cars on this forum that i have read about, if you decide you want to make more power go for the nismo 555cc injectors, they are a straight bolt in injector and dont require any plug or fuel rail modifications.

Fuel Pump: I wouldnt use the standard pump for anything over 200rwkw, most people replace the fuel pump for good reason when they have fmic,full exhaust, 10psi etc etc, they seem to get tired pretty quickly and cant pump enough fuel, i would replace it with a nismo or tomei fuel pump as they are both once again and full bolt in replacement and both come on there own bracket,filter bag and all the other bits and peices, which means to dont have to muck around with modifing things like you would have to if you went for a bosch or a walboro pump (stay away from these)

The 3" bellmouth dumpipe you have sounds fine (depending on who its made buy ofcourse), i wouldnt bother going out and spending more money on a split dump, i too will be going for a 3" bellmouth style dump/front pipe made by Unique Autosports.

But if you only want to reach around 220-230rwkw then the mods you have listed are pretty much spot on, it should make that power on about 12-14psi depending on the condition of your motor ofcourse

Good luck reaching your goal

Edited February 4, 2007 by nizmo_freek

[sinistaGTR]

Deatschwerks injectors are plug and play....excellent value for money and they give you cash back on your stock ones

[benl1981]

Thanks for the ideas fellas.

I believe the Rb25 AFM is good up to about 240rwkw...from what I've been reading so I don't plan to replace that

So you think the injectors may handle around 220-230 rwkw..what duty cycle should I expect?

Edited February 4, 2007 by benl1981

[paulr33]

stock afm and injectors will be ok for 240rwkw

they will be on border line but should be ok

fit a fuel pressure reg so you can squeeze a bit more out of the injectors

make sure you replace the stock fuel pump too

[QRI05E]

you might get 220 - 230rw/kw out of the stock injectors but you will need a rising rate FPR and your duty cycle will be close to maxing out... I dont recommend you max them out too much otherwise you will be looking for an engine rebuild...

Strongly recommend a Z32 AFM over the stock..

For Injectors ($555) + Z32 AFM ($250 - $300) will unlock approx 20 - 40rw/kw with a high flow GCG + tune...

Do it once, do it right or dont do it at all...

Cheers

[tmc_2]

I only got arouns 200rwk with the stock airflow sensor maxing out?

230rwkw seems alot for a stock rb25 airflow. I reckon u need z32 for that sorta power level?

[VLT025]

I would think you'd pretty close with just a tune/boost increase and a FMIC. AFM bypass is a good cheap way to flow more air while still metering accurately also. Issue 318/319 of autospeed.drive.com has a good article on it.