Torque Question

[LOCO]

I got a question, I got my car dyno 2day and I want to know how much "NM" Of Torque do I have

Its says Torque = 1064ftlb@146kph
and the other side said Motive Force = 1158.5LB@146KPH

[cbwolf]

1064ftlb = 1443Nm so it's completely wrong unless you have something like a TT 427, in which case you wouldn't be asking those questions.

[Mungrel]

Not necessarily,
Diff gears will impact your torque figures, well to my knowledge they do. Happy to be corrected though!

I'd be estimating 3.9s or 4.11s.

[Wonky]

I'm with cbwolf on this one. I did what you could easily have done yourself and Googled for the conversion and from two different sites came up with the same answer as him. My VE has oodles more torque than standard at 620Nm, so given you've only got 245rwkw either something is wrong with your figures or we're barking up completely the wrong tree! :eek:

[RIDE:42]

or an auto dynoed in 2nd

[CarlFST60L]

My VE has oodles more torque than standard at 620Nm

620nm is measured on an engine dyno, where as your torque figures are measured at the wheels there fore multiplied by the drive train. Unless you have had your engine out?

[Oversteer]

And wheel diameter effects this reading too..20" wheels will require more engine torque to produce the same tyre torque as smaller diameter wheels (presuming the outside diameter of the wheel is larger on the larger wheel).

Then again if you had your engine out this is an accurate reading of massive torque and low power (like a diesel but i dont think you'd have a diesel ls1) haha

[VXSS346]

And with all these variables above, peaple still believe dyno rwkw figures are accurate. :lmao:

:confused:

My 2c

Cheers :)

[Micks]

And wheel diameter effects this reading too..20" wheels will require more engine torque to produce the same tyre torque as smaller diameter wheels (presuming the outside diameter of the wheel is larger on the larger wheel).

Then again if you had your engine out this is an accurate reading of massive torque and low power (like a diesel but i dont think you'd have a diesel ls1) haha

Significant on a 19" or 20" but little or no diff on the smaller rim sizes.

Cheers
VYT

[awddynotodd]

I got a question, I got my car dyno 2day and I want to know how much "NM" Of Torque do I have

Its says Torque = 1064ftlb@146kph
and the other side said Motive Force = 1158.5LB@146KPH

Have a read of this:


Australian LS1 and Holden Forums - View Single Post - 700 nm of torque out of a vt ss (http://www.ls1.com.au/forum/showpost.php?p=861945&postcount=17)

should clear things up for you.

[Oversteer]

As i said its the outside diameter that makes the difference, differing tyre profiles can counteract the outside diameter differences to a degree. The wheel size has no bearing unless your getting really technical on motions and forces as a larger wheel has more weight at a distance further from the point of rotation and thru centripital forces then this will also change the torque, but this is negligable.

So many variables here the only true way to measure torque is on an engine dyno!

[Mungrel]

And with all these variables above, peaple still believe dyno rwkw figures are accurate. :lmao:

:confused:

My 2c

Cheers :)

:rofl: indeed!

[awddynotodd]

As i said its the outside diameter that makes the difference, differing tyre profiles can counteract the outside diameter differences to a degree. The wheel size has no bearing unless your getting really technical on motions and forces as a larger wheel has more weight at a distance further from the point of rotation and thru centripital forces then this will also change the torque, but this is negligable.

So many variables here the only true way to measure torque is on an engine dyno!

The actual Tyre Diameter is really only a small influence as far as "Torque" figures goes, changing the overall tyre height from 26" to 27" is only a 1 in 26 ratio (less than 4%). Changing a diff ratio from 3:1 to 4:1 is a 1 in 3 ratio (33%) is going to effect the Roller torque a lot more obviously.

Did you read the link I provided, it may help you understand this.

[Evman]

And with all these variables above, peaple still believe dyno rwkw figures are accurate. :lmao:

:confused:

My 2c

Cheers :)

Think about all the variables with sending man to the moon, or even more complicated, a satellite to mercury (which has orbited the sun 3 times already during it's approach...). Accurate? To the millionth decimal. If it's done correctly, there's no reason why dynos can't be accurate either. A lot of it is just mathematics.

My 2c.

[PowerTorque]

read the link....

[Wonky]

read the link....

Thanks for that - I've read it and now my head hurts! :D Am going to have to go back and re-read it. :)

[RB30X]

Auto with larger stallies always give a monterous torque figure, my standard engine upped boost only VLT made 1000ftlb?? with a 3000rpm stall.

Another dick at work was bragging his stock 5L made over 1200 with a stally but only 130rwkw.

[Metal]

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