Fmic/turbo

[JET-33]

im lookin at gettin my car down into the 11s, and maybe 10s (in-time)

besides all the other stuff that obviously needs to be done, what do u guys think is the best size cooler and turbo to get?

at the moment im leaning towards a t4 cos i want to run mega boost in my car..over 20/25 psi, but i want it to kick in early, like still at 3k rpm, not 6k

any ideas?

[Steve]

What sort of hp figure are you chasing?

IMHO, you are better off running the lowest boost that you can. Dont confuse boost pressure with air flow. It is possible to get a turbo to pump more air at 1bar than another turbo pushing 2 bar, the lower the boost the less likely you will experience detonation. Also with higher boost pressure, you may have to decompress the engine = worse off boost response and less torque at lower revs, something I would like to avoid.

It appears to me that sometimes people use boost pressure to overcome a poorly flowing engine. If you get your head ported, manifold and plenum match ported (with a decent plenum), and a decent set of cams and cam gears, you will be able to get alot better power at lower boost - with the right turbo.

As an example, AED can flow an RB25 head to 403hp at atmo, and Darren is quite confident that 600hp would be easily achievable at 1 bar.

Just some food for thought, decide what your hp goals are, and see what the best setup would be to achieve this with lowest possible boost - within of course, your other requirements of where you would like boost to come on.

Remember aslo, that in an ideal world, we would be able to make 600bhp with boost hitting hard at 1500rpm, but this just will not happen - the bigger the hp you want, the more lag to expect within reason.

Just my 0.02

Steve

[benm]

Yup as Steve said, choose a HP figure and build around that.

I see way too many people buying the biggest turbo and biggest fmic they can find and it just doesn't work together and they either end up with serious lag or way under the power figures they were expecting.

[JET-33]

im prob after an 11/12 sec road car, what sought of hp should i b lookin at...400@wheels?

[Steve]

I would think that 400hp could get you there.

Zoom (issue 61) do a comparison between the Apexi RX6 and Trust T67 could (and does in the comparison) achieve that sort of power, also the HKS range - 3037S, or 3040 could be worth a look in.

Steve

[rev210]

You need between 350 and 400HP at the flywheel to get the 11's all things being equal. More horsepower makes that task easier all the same, so why not 800HP?

Readings at the tyres are not what you ought to interest yourself in. Get components together for an engine power rating.

A good ballbearing turbo, airflow rated at 420-450HP should do the trick, then a intercooler of the same rating. Then do everything else that needs doing for that power, to make the motor last.

[Steve]

.... and this will probably save you heaps of oxford schollars, internals aren't cheap

[JET-33]

what extent of internals r needed in an 11/12 sec 33

[rev210]

standard should be ok if its 400HP or less .

[JET-33]

is that at engine or wheels?

[rev210]

engine. don't make me slap you!

[JET-33]

:fight!:

[JET-33]

400 at the engine aint gonna run 11s, or 12s..would it?

i cant that happening

[rev210]

did you say you can't see that happening?

Thats ok it won't then.

[JET-33]

u know any1 with a line who runs 11s with 400hp at the engine?

what mods r done to it?

[whatsisname]

With very good traction (1.8-1.9 60') & a "genuine" 400hp engine I believe high 11's are possible. Certainly low 12's.

[Steve]

whatsisname,

what sort of internal work have you had done? Aslo what sort of turbo are you using to get 257rwkw at 13psi?

cheers

Steve

[predator]

hmmm..start saving!! to get you up to that is probably going to cost you the best part of $10k (depending on how you source your parts). Every second off is $$$ and it goes up and up.

Do you want to get those times for coolness factor or to actually use on a track in drag or racing??

You might actually find that as you go up you might have second thoughts about having something that quick (try that in the wet ). Seems like you are chasing something truly quick but as you get into it more, because of reliability, safety and above all cost (petrol costs, rebuilding engines, running back and foward, etc, etc) you might have second thoughts.

[Jay95R33]

If your after those sort of times, I think the easiest way would be to sell the GTS-t and buy a R32 GTR. Instant 12's.. And 11's not too far away.

J

[rev210]

Here is an example : 400Hp or just a snick under in a car that weighs the same as an R33 line (VH commodore) low 11's all day on street rubber, 10's with slicks.

Skylines are not a special case. Apply the basics with that much power and you will get the times.