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Power and Torque figures from rolling road test



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quarterflash

Club Member

Mon 27 Nov 17 11:23

Power and Torque figures from rolling road test


Hi
I recently had my car tested on a rolling road. The figures are as follows:
Engine power - 285 bhp or 212Kw, Wheel power 222bhp or 166Kw and Torque - 214lb.ft
Max power at 132mph.
Bearing in mind that the engine is from a '95 vette do the figures seem about right?
I think the power might be in the right region but the torque seems low.

Thankx
Q


--------------------
Chevy and Porsche coming together

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roscobbc

Committee Member

Mon 27 Nov 17 18:06

Re: Power and Torque figures from rolling road test


Torque is rarely higher than BHP - seems about the correct balance IMHO


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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Invetterate

Club Member

Mon 27 Nov 17 21:29

Re: Power and Torque figures from rolling road test


Apologies Ross but I don't think it can be right....

The '95 LT1 was "advertised" with 300hp @ 5000rpm and 340 lbs-ft @3600rpm. So 285 seems about right. More to the point and assuming the 285hp is produced @ 5000, then the amount of torque needed to produce it is calculated as follows:

Torque =
HP x 5252 [The 5252 is derived from 33000 ft-lbs/min divided by 2pi]
RPM

= 285 x 5252 = 299.36 lbs-ft
5000

This, of course, is at RPM above torque peak so peak torque will be higher. As long as the RPM figure from the dyno is about 5000, the engine must be producing at least 299 lbs-ft.

Sure it is not 315 on the print out?



Last edited by Invetterate on Mon 27 Nov 17 21:31; edited 1 time in total. [9 %]

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roscobbc

Committee Member

Mon 27 Nov 17 22:53

Re: Power and Torque figures from rolling road test


I bow to superior (and better investigated/calculated) knowledge - and in hindsight I had it all 'ass about face' anyhow Willy (its age related........ Banghead)


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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Invetterate

Club Member

Tue 28 Nov 17 08:05

Re: Power and Torque figures from rolling road test


Know that feeling! silly

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roppa440

Club Member

Wed 29 Nov 17 11:34

Re: Power and Torque figures from rolling road test


At 5252rpm, horsepower will always exactly match torque because 5252 divided by 5252 cancel each other out.
So at that exact rpm HP=Torque.

Before 5252rpm Torque is always higher than HP and by 5000rpm will already be dropping past it's peak.

After 5252rpm HP is always higher than torque but in number terms can be close but not as high as torque was.

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