calculating Torque
Posted: Fri May 25, 2007 5:58 pm
To all you brainy people,
Can anybody tell me how to work out what toqure a engine will do?
Can anybody tell me how to work out what toqure a engine will do?
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calculating Torque
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Posted: Fri May 25, 2007 6:40 pm
There you go...
Posted: Fri May 25, 2007 7:41 pm
Or if you have VAG COM then view/log channel 120 whilst doing some runs in 3rd gear.
Posted: Sat May 26, 2007 8:21 am
cheers mate
Posted: Sat May 26, 2007 9:14 am
Is that in Nm or lbs/ft?MCB wrote:There you go...
Sorry - guessing it's lbs/ft.Posted: Sat May 26, 2007 9:39 am
No worries and you guessed right.
And just in case anyone is interested, where does 5,252 come from?
HP = 550 foot pounds per second
Engine RPM = 0.10472 radians per second
550 divided by 0.10472 = 5,252
And just in case anyone is interested, where does 5,252 come from?
HP = 550 foot pounds per second
Engine RPM = 0.10472 radians per second
550 divided by 0.10472 = 5,252
Posted: Sat May 26, 2007 10:05 am
Eee your'e just too quick - my next question was re the constant.
Anyone remember what point on the RPM peak torque occurs on a standard S4?
Anyone remember what point on the RPM peak torque occurs on a standard S4?
Posted: Sat May 26, 2007 10:17 am
Taken from the Audi S4 Engine PDF:
Posted: Sat May 26, 2007 10:30 am
Thanks:
1 Lb-Ft = 1.35582 Nm.
1 Lb-Ft = 1.35582 Nm.
Posted: Sat May 26, 2007 10:54 am
Posted: Sat May 26, 2007 11:01 am
Posted: Sat May 26, 2007 1:09 pm
Interesting stuff ...
Anyone know at what revs a K04 car (+ big injectors, no pre-cats or cats, RS4 i/c's, MRC custom re-map etc) would make its peak torque ... ?
Anyone know at what revs a K04 car (+ big injectors, no pre-cats or cats, RS4 i/c's, MRC custom re-map etc) would make its peak torque ... ?
Posted: Sat May 26, 2007 1:12 pm
No idea, but I'll be taking mine to the Janspeed Rollers again in the not too distant future. Be great to see yours on there...S4TAN wrote:Interesting stuff ...
Anyone know at what revs a K04 car (+ big injectors, no pre-cats or cats, RS4 i/c's, MRC custom re-map etc) would make its peak torque ... ?
Posted: Sat May 26, 2007 1:52 pm
I'm up for that Mark - Doug estimated mine to be about 430bhp/480ftlb ... so adjusting the formula to:No idea, but I'll be taking mine to the Janspeed Rollers again in the not too distant future. Be great to see yours on there...
RPM = (5252xbhp)/torque gives peak torque at ~4,700rpm ...
It "feels" like i'm getting peak torque a bit lower than that in the rev range (maybe 4.5Krpm), which puts me around 500ftlb... highly unscientific i know - so will be good to get it on the rollers and get some more definitive figures ... see how close Dougs estimate is.
Let me know when you're going ...
Posted: Sat May 26, 2007 1:58 pm
Get down to Aylesbury Julian, it's only local - dyno dynamics dyno same machine type as I see Doug and Mihnea's latest power runs were done on and also used by myself KayGee recently and DavidT in the past.
Comparing your and KayGee's car would be a good comparison.
Comparing your and KayGee's car would be a good comparison.