Gtr Dyno Reading Low?

[PHATR32]

hi guys,

I got my gtr dyno'ed a couple of weeks ago, and was wondering if the power figure was normal.

Its early 89, no doubt 200k+ on the clock.

got 225HP at 8psi boost

only mods are Apexi pods (no heat sheild)

Fuel was caltex vortex (couldnt fill up on bp98 at the time)

Its got the stock exhaust, cat, and boost restrictor.

I havnt run a compression test or leakdown test yet, and it doesnt seem to be using up oil.

so is that figure someting to worry about, or is it normal for a car of that age?

Thanks

Steve

Edited May 11, 2006 by PHATR32

[Beer Baron]

help my poor brain out, what's that in kw. and is it 4wheel dyno or 2 wheel?

[Quinny]

That sounds pretty good for a stock 200k+ km GTR. If the car was modified the it might be a different story. The figure is even better if you used a 4WD dyno as you get more drivetrain loss. I wouldn't worry too much about the actual power figure asy dynos always vary, your power & torque curves will tell more about the way your car is running.

Beer Baron: 225hp is about 168kw.

Edited May 11, 2006 by Quinny

[PHATR32]

yeah its 168kw, at the rear wheels.

i was just thinking about it last night, and it popped into my head that they are 206kw from factory form.

But then i just thought about it again a few mins ago (after a strong coffee) and remebered thats 206kw at the engine.

So therefore: drivetrain loss + 16 years of abuse + 200K = lower power reading?

did i just answer my own question?

steve

Edited May 11, 2006 by PHATR32

[Mandingo]

Jap tuning is shit. very few shops have A/F ratio meters let alone a dyno, so everything is overfueld. my guess is thats your problem you didnt just dyno for power did you?

[PHATR32]

i forgot to ask for a torque and a/f reading.

steve

[PHATR32]

so its looks ok then?

[PSI_GTSII]

Power figure looks fine to me for an 8psi run.

What did Ken / Glen say about it while you were there? they have dyno'd plenty of GTRs

[Simonster]

Looks good, nice solid power for such an aged car.

Ring Lumpy and ask him if he'll print you one with the AFR on it. Should still be in the computer.

You won't get a torque graph. Well you can but it won't be accurate, once you start running it through gearbox/diff etc the figures of the reading will mean nothing. all it will do is give you an idea where it's strong and where it isn't. Remember, to get an ACCURATE torque figure you need and engine dyno, once the gearbox diff/tyres come into the equation all it will give you is an ESTIMTAE of tractive effort.

Hope I've explained that clearly?

[PHATR32]

yeah thanx for that.

i dont remember asking ken about it though, although im sure he would have said something if it looked low

steve

[Gav]

yeah thanx for that.

i dont remember asking ken about it though, although im sure he would have said something if it looked low

steve

Ken has seen/driven/owned a shite load of GT-Rs. I'm sure he'd comment if there was anything untoward.