hi, i have just bought an v7 sti jdm. with the car came a printout from a rolling road test that has recently been carried out. the engine power is 335 bhp, wheel power is 209 and torque is 404 Nm, being a total newbie is this normal (the difference from engine and wheel power) and what is the difference between Nm and ft lbs? any help would be grately appreciated. cheers dave.

 

404 nm torque is 297.94 lb/ft

Not sure about the wheel horsepower but 209 bhp does seem a bit low if the flywheel horsepower is 330 bhp??

 

330hp at the flywheel should that equate to around 230hp at the wheels? not eally sure if this is correct drivetrain lost of 40% for 4wd dynos?

 

330bhp should equate to around 260-270bhp@wheels, 209 is far too low.

Tony

 

It can depend which gear its run in
I used to have difficulty at Powerstation getting a reading in 4th - done in 5th the drag was much bigger and I had a power at wheels as ***** as this one is reading..........

 

rule of is 24% from lump to wheel

 

the results are dependant on which dyno has been used for the figures.

 

I suggest some people at first find out how certain RR's actually work their figures out, before disclaiming and suggesting how much the drag calculation should be...... without even knowing which RR was actually used.

jd5217,
Correct!

daveriley,
Which type of RR was your car run on. I will hazard a guess at a MAHA. If this is the case, ignore the PAW figure. All things being equal, your flywheel figure will be comparable.

Shaun

 

First of all thanks for all the replys, they are well appreciated. The printout is from powerstation if that helps.

 

lol - That is absolutely fine and believable. You have nothing to worry about.

Go to a Dyno Dynamics RR and you will get around the same flywheel BHP, but slightly more flywheel torque. All in, certainly in the same region.

 

had the same question when mine was dynoed at Powerstation, but got told to ignore the wheel figures.

 

Wheel power is really the only thing you are interested in and will give indications of how fast/powerful the car is on the road. Fly wheel figures are much better pub talk though.

Dave

 

but as mentioned above the wheel figures from the Maha can be ignored.

 

thanks very much for all your replys, iam going to book it in at rc developments on tuesday to get a proper reading. my aim is 400bhp what do you all think on a jdm, will the engine be capable with standard internals?

 

with a JDM, id say yes, a good type UK would have good enough stuff for 400bhp....just ...maybe a few bits and bobs here and there, turbo, injectors etc.

A sti jdm will be nearly 300bhp I think, so after a re-map and de-cat...your looking at 350bhp.........anyone care to correct me, am I thinking right with that?

 

I think the only things that have been modified on the car at the minuit are a 3" stainless exaust, dump valve and green panel filter. The fella i bought it of told me it has had a remap but there are no indications of that in all the receipts i've got. Think i'll wait till i've spoke to rc developments and see what they recomend, sure they will point me in the right direction.

 

Yep, don't think you'll go far wrong with RC, got a great reputation, even if its a standard JDM sti though, it should still be running a good 300bhp or thereabouts.

Great platform for modding as they have stronger internals than the UK ones

 

good read, i'm alwas wondering on what sort of power my uk 95 has.

i keep hearing about the sti's being better/stronger.
but as i've put sti v4 pistons in my uk engine. should this not help the strengh at all?

living in nottingham. any good riolling roads around there
sorry if it seems like a thread hi jack...

 

can happily do 400bhp on either UK or jdm.

 

Wasn't that sure with the uK one, id have thought a few new uprated parts would have been in order on the type uk, good to know though, seen as I have one, its just if it can run reliably at that spec...

 

turbo, injectors, fmic with cai, headers, exhaust, simtek ecu, fuel pump.

dyno dynamisc results 420bhp on V Power, 446bhp on 10% methanol.
powerstation results 464bhp & 394lb/ft on 10% methanol.

If you want 400bhp+ give Martyn a bell at Alan Jeffery - Engine Tuner they will put together a package for you.

 

yes i ran 340 at fly and 288 at wheels on my last set up.

Hoping for about 380 and 320 this time

 

I have JDM v7sti , stock its 280bph , they come stock with forged pistons and con rods in comparison to the UK model , at present car runs 475bph as a daily drive , our gear box is good for 500bph . I have no problems with that power on stock cams and internals .

 

Thats good to know, did'nt really want to start upgrading the internals, sounds like heavy money.