Tractive effort -> Torque (Nm)

[R32 GTSTT]

I made 1600 tractive effort on the dyno anyone know appox how much torque that is in Nm? Cheers

[dojobi]

I'm not too sure if that's possible to work out. If you know the power at the rpm where your torque curve is at its highest, you can calculate the torque with this formula:

T(Nm) = P(kW) x 9543 ÷ RPM

[R32 GTSTT]

power at wheels or engine?

[RedRocket]

it depends what shoes you were wearing...

seriously though, I have been told by tuners that you cant work it out.

It is dependent upon too many factors like gearing etc.

Having said that your tuner can make an educated guess if hes familiar

enough with the model of car.

[dojobi]

That formula would give you torque at the wheels because you're working off the power at the wheels.

Remember power is just the relationship between torque and rpm, so if you know the power and the rpm, you know the torque.

[R32 GTSTT]

ok so i made 172rwkw @ 2500rpm

T(Nm) = P(kW) x 9543 ÷ RPM

= 172 x 9543 ÷ 2500

= 656.5 Nm

thats more torque than a 300kw monaro are u sure this is right?

[dojobi]

well it'd be right if you were making 172rwkw @ 2500rpm, but I doubt that's what your car puts out. Your peak power might be that, but at 2500rpm, it'd be way lower. Post up your dyno sheet and I'll take a look at it if you want.

[R32 GTSTT]

haven't got a scanner but ive got a rb30det with to4. but i couldn't get it to hold boost, so it went to 16psi at around 4 then dropped down to 11 after that.

101rwhp at 1000

119rwhp at 1500

168rwhp at 2000

231rwhp at 2500

258rwhp at 3000

270rwhp at 4000

252rwhp at 5000

255rwhp at 6000

245rwhp at 7000

read them straight of the sheet hope that helps.

[Pieoter]

530Ft/lb @1000

417Ft/lb @1500

441Ft/lb @2000

485Ft/lb @2500

451Ft/lb @3000

355Ft/lb @4000

265Ft/lb @5000

223Ft/lb @6000

184Ft/lb @7000

Those are what i got.

[dojobi]

That'd be one interesting dyno to see! If you can get access to a scanner I'd love to see it.

So you're saying your dyno sheet essentially has a flat power line from 3000rpm all the way to 7000rpm?

If those numbers are right, then your car is indeed making 650Nm at the wheels because 172rwkw at 2500rpm is ridiculously good. As you say, this is well above a 300kW Monaro and at much lower revs too. What mods have you got? I knew RB30s were good, but this is amazing.

[dojobi]

With Pieoter's calculations there, it actually shows that you've got more torque at 1000rpm than you do anywhere else. I think there's something wrong with your dyno sheet.

[R32 GTSTT]

530Ft/lb @1000

i got that as well but it looks a bit out of place.

so 485Ft/lb @2500

485Ft/lb x 1.35582 is 657Nm????

[Cubes]

My RB30DET (RB30 Forged pistons, R32 RB25DE Head) with the stock rb20det turbo and a quick 1hr tune made 100rwkw at 2000rpm, boost was 12psi @ 2000rpm then tailed off to 9psi by 4400rpm where it made peak power of 175rwkw.

4950rpm it was still making 175rwkw.

6100rpm it made 137rwkw.

100rwkw at 2000rpm = 477nM

175rwkw at 4400rpm = 379nM

175rwkw at 4950rpm = 337nM

137rwkw at 6100rpm = 214Nm

This power is at the wheels.

Add ~50kw for drivetrain loss, even though at 175rwkw its more likely to be 60rwkw loss.

So

150fwkw at 2000rpm = 715nM

225fwkw at 4400rpm = 487nM

225fwkw at 4950rpm = 433nM

187fwkw at 6100rpm = 292nM

It rev's like a Nissan Patrol 3.0TDI.

[R32 GTSTT]

yes max power is 271rwhp 3500 and dips to 255rwhp at 5000. then is increases by 10rwhp to 7000.

it is a stock rb30 bottom end with a rb25de head. and a to4 turbo which has a rb25 exhaust housing which has been machined out. nothing much special. im running wolf 3dv4

[dojobi]

yep, which is what we got when we converted from the kW figures earlier. Very strange.

[Cubes]

R32 GTT, 101rwhp is 75rwkw.. I highly doubt you have that at 1000rpm.

Maybe the inlet temp sensor was in a hotter than air intake temp position?

[R32 GTSTT]

yer i prolly used 101 instead of 75 opps