catamax944

A friend took his '87 951 to the dyno and the result is kinda strange.
Its making max hp at 6500 instead of 5800-6000 and max torque at 4600 instead of 3500.Also the torque is only 204 lb/ft lol.
Can anyone tell me what might be wrong with the car by looking at this chart?
What other things seem wrong to you in the chart?
ps: the car is completely stock.

Jeremy Himsel

Hmmm, Well I can't read the chart....dumb american.......but there is something wrong. HP and TQ curves need to meet @ 5250 and are 250 rpm's late (5500) so something was either wrong with the dyno set-up or the pickup. Was the test done in 4th gear?

catamax944

in 5th....

Jeremy Himsel

There's your problem. It needs to be done in 4th gear.

V2Rocket

oh lol gearing is too low duh.

+1 on the crossing being wrong but CVs are different than HPs and Nms are different than Tqs

catamax944

Ok,thanks guys.
That means that the guys at the dyno room are total idiots if they didnt knew something like that lol.

ps: CV is the same as HP , it means cavalli that translated means horse power.

V2Rocket

oh well i knew that but the American standard for what is equal to a HP is different from the Italian...some SAE thing

catamax944

You mean the difference between the two standards,DIN and SAE,(which is small anyway) but usually the standard used for CV is DIN here
And in the cars documents is written in KW but everybody uses CV as a measuring unit,kinda stupid and confusing but..........
Doesn't really matter anyway.....

Thanks again,

DrIftAgious

learn something new everyday! ^.^

V2Rocket

yea thats why the audi R8 is rated 420HP DIN but in the US its like 417

krystar

so what are the stock 951's numbers supposed to be?

i thought highest stock specs were 250hp 240tq . minus drivetrain loss, 216hp/204tq doesn't sound too out of norm.

V2Rocket

951 specs were 220HP/243 tqs, 951S 250/250

catamax944

the torque is what was more concerning and the very high rpm at which both power and torque were obtained.

Rogue_Ant

HP/Tq won't change much between gears. 5-10hp at most.

Also with HP on the left & Tq on the right, looks to me that Tq is ~280, and HP is ~215... And because they are different scales the HP/Tq curves don't 'appear' to cross at the correct point. But I'm willing to bet they will if both curves are scaled the same.


-Rogue

catamax944

Ok but.....
Tq is 276 Nm(204 tq) instead of 329 Nm (243 tq) . That seems like a pretty big loss considering that Hp is almost perfect.Why is that?If running in 4th gear gets it 5 more hp power will be perfect but torque will still be down by a substantial amount.
And why there are both obtained at such high rpm?