What mods to do on a rb25det for around 400hp?

[rajie]

just call AC Motorsport n ask him how much for GTR engine ....he did a customer car from a R33GTT converted the engine to RB26 + haltech n bigger turbine i think it cost less than 40k with labour n the whp is higher than 400bhp ..

 

[DarkChild]

400whp on just ECU, Exhaust, EBC? Those are very optimistic figures mate.

To be honest, many of the stuff you see or read, don't actually tell you the whole story. They tend to confuse BHP, Flywheel HP, Hub HP, Crank HP and WHP. They are sometimes not very honest with the kind of fuel they used during the dyno. Realibility is also a factor. Also, different dyno's read differently. You'd be disappointed when you realize you cannot achieve 400whp on just ECU, Exhaust, EBC. 400 on the engine sounds more realistic.

For example, the stock GTR injectors are abour 444cc. A rough estimate is for 1hp, you need 1cc. So technically, you will only get a maximum of 444hp on the engine. To get 400 wheel hp, your car needs to be pushing at least 500-550 hp on the engine. This is because there is power lost through spring rates and aerodynamics, rotational mass, transmission, etc..etc.. Some people say it's 20%, other say more because we are running a 4wd system. In reality, it's very hard to say as different cars put down the power differently. So, as you can see, it is not possible without fueling modifications to your car to get 400whp. Next would be your stock turbines... and the list goes on.

Truthfully, I have had quite a number of mods done to my GTR and I can honestly tell you, in my personal opinion, you'd need a lot more than just ECU, Exhaust, EBC to get 400whp. I have a Nur engine and turbines on top of that...

 

[rajie]

well said ..... NUR engine

 

[Driftmeister]

400whp on just ECU, Exhaust, EBC? Those are very optimistic figures mate.

To be honest, many of the stuff you see or read, don't actually tell you the whole story. They tend to confuse BHP, Flywheel HP, Hub HP, Crank HP and WHP. They are sometimes not very honest with the kind of fuel they used during the dyno. Realibility is also a factor. Also, different dyno's read differently. You'd be disappointed when you realize you cannot achieve 400whp on just ECU, Exhaust, EBC. 400 on the engine sounds more realistic.

For example, the stock GTR injectors are abour 444cc. A rough estimate is for 1hp, you need 1cc. So technically, you will only get a maximum of 444hp on the engine. To get 400 wheel hp, your car needs to be pushing at least 500-550 hp on the engine. This is because there is power lost through spring rates and aerodynamics, rotational mass, transmission, etc..etc.. Some people say it's 20%, other say more because we are running a 4wd system. In reality, it's very hard to say as different cars put down the power differently. So, as you can see, it is not possible without fueling modifications to your car to get 400whp. Next would be your stock turbines... and the list goes on.

Truthfully, I have had quite a number of mods done to my GTR and I can honestly tell you, in my personal opinion, you'd need a lot more than just ECU, Exhaust, EBC to get 400whp. I have a Nur engine and turbines on top of that...

Sorry my bad...should be 400ps not whp. :sleep::sleep::sleep:

 

[naklaju]

good discussion here..but why 400hp?...not 400whp...

Bump: good discussion here..but why 400hp?...not 400whp...

 

[khoyos]

400hp is so low for skylines. 400whp should be the real target hehe

 

[Driftmeister]

For 400whp then it's safe to get the Tomei Stroker parts for the RB25.

http://www.nengun.com/tomei/stroker-kit-nissan-skyline-rb25-26-28l

http://www.tomei-p.co.jp/_2003web-catalogue/e018_kisyubetsu_rb25_ae.html

 

[EVO 6]

IF YOU WANT 400 HP AT THE WHEELS..

THERE'S A LOT OF THING YOU CAN DO..
BUT THIS IS WHAT I DONE TO MY NISSAN SKYLINE R32 GTS-T
I CHANGED THE RB20 TO A RB25..

THIS IS MY MOD LIST..

1) HKS T70 TURBO

2) GREDDY TRUST INTERCOOLER

3) TURBO SMART MANIFOLD AND WASTEGATE

4) HKS THROTTLE BODY

5) HKS SILENT HI POWER CAT BACK EXHAUST

6) TRUST OIL COOLER

7) SARD RADIATOR

8) HKS SUPERSONIC BLOW OFF

9) AFTER MARKET ECU SHIP

10) GREDDY TRUST TURBO BOOST CONTROLLER

11) TRUST GREDDY OIL CATCH CAN

12) WALBRO FUEL PUMP

13) HKS SPARK PLUGS

14) HKS ADJUSTABLE CAM PULLEYS

15) HKS CAMSHAFT

16) HKS TIMING BELT

17) HOLLY FUEL PRESSURE REGULATOR

18) XTREAM FLYWHEEL

19) HKS Surge Tank

20) SARD 800CC FUEL INJECTORS

THIS MAKES ABOUT 450 HORSEPOWER AT THE WHEELS
ON 2 BAR BOOST..

 

[khoyos]

bro, no engine internal mod? my car boost 0.8bar also all 6 pistons shit themselves already. oil pump?

 

[Dr.D]

wow, 450 on wheel.. thats awesome!!! wel , i guess the internals cantake it.. i read some rb25 making 570 bhp with stock internals.. before it melted of course..hehehe.. any ways, sir driftmeister, ur hitting 400 whp already at 1.4bar.. whats ur secret? n ur Top Secret tuner..hehehe

 

[eyong]

Looking at all the suggestions to mod the RB25 just to get to 400hp, why not just go straight for an RB26. At least the internals will be good for up to 500-600hp. A pair of GT-SS, mild ecu and boost controller, and you are almost there if not past your target :hmmmm:

And it would be a 26, for a much cheaper price tag too (say ~20-25k all up) ...

 

[iloveskyline]

if R34 GTT how to mod???i heard ppl say wan to upgrade the ECU also???

 

[Dr.D]

my opinion, thats the first thing u should do.. get gtt, put apexi pfc, z32 afm n cams..

 

[airtreknic]

i'm driving a er34 gtt auto, so is it the same method of modification with the manual gtt??? How about the auto gear box can it take that kind of hp??? I've just change the exhaust system and thinking to go further like air filter, ecu, oil cooler , intercooler and a boost controller. Engine internal maybe later. Any suggestion???

 

[JaHaX]

airtrecnic ...

some of my crazy mates used to say that

driving an auto is like having sex with ur wife ... kinda normal thingy
driving a manual is like having sex with ur mistress ... kinkyyyyyy

as for me, im not sure abt the above as im still pretty much a bachelor

by the way, stop all the bullshit, if u wanna convert ur auto tranny to manual tranny, u might as well cosult NAKLAJU as he has done that ... successfully

 

[naklaju]

its not only me the one that change the auto trans to manual...there is others also....hehehehee...but may be i'm the only one here in zth..

 

[V-Spec]

Benny also converted from auto to manual.

 

[airtreknic]

naklaju, how much did you paid to do the convertion, any any kacau after the convertion???

 

[RyDeL]

As for the conversion AT to MT do we need to remap the ecu or some of my fren says the ecu will self diagnose about the conversion

 

[JaHaX]

i think it is best for both of u to wait for naklaju's reply ... he has been there and done that