How Much Power For These Mods

[FSTR32]

Help guys.....i know its a stupid question but i dont know how much power i want?

The Car is a R32 Gtst

My engine which is an R34 Neo RB25DET is in the process of being fully rebuilt....

Im getting the works done to the engine - Bored out, forged pistons, bronzed valve guides, n1 water pump and oil pump, porting of heads and alot more other stuff etc

The setup i am running is a high mounted garret t4 avr50 (fully rebuilt to reduce lag and come on boost quicker) , 45mm turbosmart waste gate, sard fuel reg, gtr pump, microtek, fmic, full exhaust, aftermarket button clutch, full whiteline adjustable suspension kit.

I want it built so it is still very driveable and reliable on the street but i want it to be bloody quick aswell but still being able to keep traction. What sort of power figure should i aim for? How much power is too much before its just wasted because you cant put it to the ground. For those mods what should a realistic power figure be...thats what i am asking. Thanks guys

[fresh]

how much power you can get to the ground will depend on how wide your tyres are, wether you've got decent tyres on there, and your rear end suspension setup.

should be able to make a fair bit out of that engine though

[Craved]

some more details on the turbo would be good too.. like the actual model number.

or at least some details like front AR, and rear AR to start.

[R31Nismoid]

It wont be quick with an old shagger t04

[FSTR32]

I will get more details on the turbo...Thanks for that nosmoid....actually i beleive it will be very quick as the turbo is pretty much gonna be custom built to the set up. It wont be a t4 when they're done with it. The only t4 part on it will be the housing so yeh.

Thats a good point about the tyres and suspension setup...i nearly forgot about the tyres part of the build. My tyres are pretty damn wide at the rears tho. 9.5 i beleive

Anything else i should consider. Its mainly goin to be a street car but i wanna be able to hav the occassional quick dash at the creek.

The workshop hav asked me how much power i want and im still not sure....i quess i should go for the most power before it starts loosing traction? 250...300...350kw???Whats the most power you should go on this setup before u need to get bigger fuel pump and injectors because i will do all that after i have run the engine in

Thanks guys

[RANDY]

Injectors, ECU, fuel pump, and fuel reg will probably all have to be looked at, from what i've seen out of other people's mods.

Breaking traction... it's controlled by your right foot (and left to some degree). If you want 300rwkw, you'd have to do the above mods, but you'd have a VERY quick streeter capable of some quick sprints. If you mash the pedal, it will probably spin... this is where a lot of the skill of racing comes into it I beleive.

[wilch]

The workshop hav asked me how much power i want and im still not sure....i quess i should go for the most power before it starts loosing traction? 250...300...350kw???Whats the most power you should go on this setup before u need to get bigger fuel pump and injectors because i will do all that after i have run the engine in

Thanks guys

To get to 250+rwkW you will need a higher flowing fuel pump and bigger injectors.

btw, is your number plate FST32R and do you work at IBM CF?

[R31Nismoid]

I will get more details on the turbo...Thanks for that nosmoid....actually i beleive it will be very quick as the turbo is pretty much gonna be custom built to the set up. It wont be a t4 when they're done with it. The only t4 part on it will be the housing so yeh.

what t04 housing? front or rear?

the .7 comp is one of the most common comp housings, so its not a t04, if your using the rear, then the A/R is a factor here.

The t4 wasnt bush bearing, so unless they are rebuilding it with a Ball Bearing Cart, then i cant see it having the best response it could have (which is what you are after)

Anyhow, your asking what power will be achieved... but you cant provide the turbo spec.

Its like having a meat pie and no sauce, you cant have one without the other.

Get the turbo specs and then you'll see the technical answers flow forth

[paulr33]

you may wish to look into the stock internal limits for the 25neo as i dont think they are the same as the rb25

[FSTR32]

you may wish to look into the stock internal limits for the 25neo as i dont think they are the same as the rb25

The internals that are going into the engine are far from stock mate.....

[FSTR32]

To get to 250+rwkW you will need a higher flowing fuel pump and bigger injectors.

btw, is your number plate FST32R and do you work at IBM CF?

No my plates arnt FST32R and i do not work at IBM CF

[FSTR32]

what t04 housing? front or rear?

the .7 comp is one of the most common comp housings, so its not a t04, if your using the rear, then the A/R is a factor here.

The t4 wasnt bush bearing, so unless they are rebuilding it with a Ball Bearing Cart, then i cant see it having the best response it could have (which is what you are after)

Anyhow, your asking what power will be achieved... but you cant provide the turbo spec.

Its like having a meat pie and no sauce, you cant have one without the other.

Get the turbo specs and then you'll see the technical answers flow forth

Ok i will try get the turbo specs and yes they are replacing the bush bearings with nice new ball bearings so it is gonna flow alot better i'd say.

[Craved]

well i'll give you this idea, on 225's rear tyres im running 294rwkw with full boost at 4700rpm - GT3040 1.12 rear housing.

its spins top end in 3rd gear at over 120kph.. but with better 9.5" wide rims with good tyres... you might wanna do something with your diff if using sticky tyres..

oh and runing the rb25 GB too i'd hope.

fairly driveable off boost, but yeah streetable isn't really what i'd call it. can work but isn't nice for simple over takes, goota plan ahead to do it in a short distance.

theres some idea's for you

if i were you, plan foraround 300rwkw and as much low down as you can get..

[markimak]

apprently the Neo25 is near the same as the RB26 head. I SAID NEAR. i say ur lookin at more than 300kw dnt use a GTR pump. and put more fuel into her. 9.5 on rears r fat. if u use a potenza, GRiD III or yoko.? some good brand tyre. i believe this will be a nice quick street car.

[Craved]

NEO's have solid lifters and GTR rods std.. also i heard higher compression... but cant comment on that since the slugs have been changed..

044 pump, surge tank.. 550cc injectors would be fine..

[FSTR32]

well i'll give you this idea, on 225's rear tyres im running 294rwkw with full boost at 4700rpm - GT3040 1.12 rear housing.

its spins top end in 3rd gear at over 120kph.. but with better 9.5" wide rims with good tyres... you might wanna do something with your diff if using sticky tyres..

oh and runing the rb25 GB too i'd hope.

fairly driveable off boost, but yeah streetable isn't really what i'd call it. can work but isn't nice for simple over takes, goota plan ahead to do it in a short distance.

theres some idea's for you

if i were you, plan foraround 300rwkw and as much low down as you can get..

Hey thanks for your help...yeh im running a r33 rb25 gearbox aswell...what would u reccommend doin with the diff, im pretty sure its got something done to it maybe lsd???dont know. 044 and 550's, would i really need the surge tank? what would the benefit of a surge tank be remembering this is gonna be primarily a street car....yeh i think i should aim for 300 with bigger injectors and fuel pump...sounds like a nice round and beefy number..hehe

Cheers guys....keep the comments coming and i will let you guys know how it pans out.

[Craved]

wont need the surge tank, i used to use the car for track work when it was std, and will again, thats why i did it.. you just need to make sure that the tank is over 1/4 full..

lsd, you would notice the "skipping" on tight turns in car parks... where it spins the inside wheel

im just gonna see how long my diff lasts cos the i "HAVE" to change it

[FSTR32]

Ok guys for those that wanted to know the turbo specs....here they are

turbocharger has 0.58a/r Turbine, 0.50a/r compressor and rated at

500hp.

hope that helps in determining what kinda power and response i get outa this engine...

Thanks guys

[Craved]

i cant see how it could be rated at 500hp

the compressor housing is very small but should be responsive..

most 500ps rated turbos have around 0.70 compressor housings..

and the rear housing is small but will give good response, but might choke..

lets see if someone who knows more about it says ... *waits for Ash to come on lol

[FSTR32]

i cant see how it could be rated at 500hp

the compressor housing is very small but should be responsive..

most 500ps rated turbos have around 0.70 compressor housings..

and the rear housing is small but will give good response, but might choke..

lets see if someone who knows more about it says ... *waits for Ash to come on lol

well thats what the workshop have told me and trust me i think these guys know what they are talking about...those specs should be fine for 250 -300 kw's especially since the turbo will be pretty much brand new with ball bearings and all the good bits......smaller compressor should be a heap more responsive but then again there is also not the biggest turbine so we will see what kinda figures and response this baby will make