TurboS Dyno results
07-28-2004, 09:03 PM
#17
Rennlist Member
Join Date: Oct 2003
Location: Cherry Hill,N.J
Posts: 349
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by sl951
If both the torque and horsepower are messured at the same point, then the follow is true.
Torque and Horse power always cross at 5252.. period.. it's a physical LAW!
Since both the Torque and Horsepower are messured at the Wheels (same point).. the graphs should cross at 5252.... Regardless of gears.
T = HP x 5252
rpm
T = torque (in lb-ft)
HP = horsepower
5252 = constant (33,000 divided by 3.14 x 2 = 5252)
rpm = revolutions per minute
Torque and Horse power always cross at 5252.. period.. it's a physical LAW!
Since both the Torque and Horsepower are messured at the Wheels (same point).. the graphs should cross at 5252.... Regardless of gears.
T = HP x 5252
rpm
T = torque (in lb-ft)
HP = horsepower
5252 = constant (33,000 divided by 3.14 x 2 = 5252)
rpm = revolutions per minute
07-28-2004, 09:22 PM
#19
Nordschleife Master
Originally Posted by Wormhole
Adrial, on the Dynapack, the gear ratio is multiplied by the R&P to get the final drive ratio for correct calibration. Given this any deviation in gear ratio should impact RPM.
Not sure what it is for the TurboS, but my 86 gearbox we used 3.49 at demans.
I can't imagine why any SAE correction would impact RPM.
Not sure what it is for the TurboS, but my 86 gearbox we used 3.49 at demans.
I can't imagine why any SAE correction would impact RPM.
So if it was a hot humid day, horsepower would read higher and thus not cross at 5252.
3.49 vs. 3.489 I'm not really sure what the difference would be. It is the same for the turbo S, btw. It was just a matter of rounding, I think.
07-28-2004, 09:40 PM
#20
Three Wheelin'
Join Date: Jul 2001
Location: Reading PA
Posts: 1,667
Likes: 0
Received 0 Likes
on
0 Posts
billgot your first picture is a little hard to see but it looks like the HP and TQ scales on the left and right are different. If you look at the HP value at 5252rpm and the TQ value at 5252rpm they will probably be the same.
07-28-2004, 10:07 PM
#21
Race Director
Here's the same dyno-chart again with the HP-chart scaled to the same axis as the torque-curve and overlaid. They still don't cross at the correct RPM. something's not right. Also the torque drop form its 250 lb-ft peak all the way down to 140 lb-ft by redline is a little excessive. What's your boost at redline?
07-29-2004, 11:34 AM
#23
Track Day
Join Date: Jul 2004
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
which is corect. 1988 944 turbo or 1989 944 turbo "s". It states at begining of post that car is 1988 turbo "s" and se all know by now that a factory turbo "s" only in u.s. in 1989 only painted rose metalic unless speical orderd.
07-29-2004, 04:58 PM
#24
Rennlist Member
Join Date: Oct 2003
Location: Cherry Hill,N.J
Posts: 349
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by tazman
billgot your first picture is a little hard to see but it looks like the HP and TQ scales on the left and right are different. If you look at the HP value at 5252rpm and the TQ value at 5252rpm they will probably be the same.
07-29-2004, 05:00 PM
#25
Rennlist Member
Join Date: Oct 2003
Location: Cherry Hill,N.J
Posts: 349
Likes: 0
Received 0 Likes
on
0 Posts
As I got my tune better the merge got closer to 5200 This is all done in the same day on the same Dyno.So tune has to have something to do with the 5200 merge mark.
07-29-2004, 05:09 PM
#26
Originally Posted by racebryce
which is corect. 1988 944 turbo or 1989 944 turbo "s". It states at begining of post that car is 1988 turbo "s" and se all know by now that a factory turbo "s" only in u.s. in 1989 only painted rose metalic unless speical orderd.
07-29-2004, 05:12 PM
#27
Drifting
Join Date: Jul 2002
Location: Espoo, Finland
Posts: 2,668
Likes: 0
Received 0 Likes
on
0 Posts
Thomas, take a close look at your graphs; on the first one, where the hp/tq lines don't cross at 5252 rpm, the scale is different - on y-axis the values for hp range from 0 to 350, and for tq they're between 0 and 400... on the later charts, the scale is the same, from 0 to 400 on both... and they cross right where they should. Tune has nothing to do with it, honest!
07-29-2004, 05:16 PM
#28
Addict
Rennlist Member
Rennlist Member
Originally Posted by billgot
As I got my tune better the merge got closer to 5200 This is all done in the same day on the same Dyno.So tune has to have something to do with the 5200 merge mark.
EDIT: Sami just beat me to it with the same explanation.
