Dave

[quote]Originally posted by richglickel:
<strong>Dave,

Did you get a read out, or were you a clutch/slip guy like me?

Richard
'87 Carrera-3.6L <img src="graemlins/c.gif" border="0" alt="[ouch]" /> </strong><hr></blockquote>

Clutch slip, couldn't get past 3600 rpm/70 hp.

951Porsche, I don't know how much of this you caught, but of 7 cars, 3 had problems that were attributed to slipping clutches. The dyno run would start out fine but as the RPM climbed the car would start to buck, usually 3k to 4k, none of us have any sign of worn clutch on the road. Any thoughts?

adrial

[quote]Originally posted by 951porsche:
<strong>Hey guys,
I run a Dynapack dyno out in Colorado. The dyno's raw torque #s are calculated from the hubs, and those #'s are run though the SAE correction factor to show SAE corrected HP. This takes into account baro. press, temp, humidity. Dynapack dyno's don't correct for torque as there is not an SAE correction factor for torque, as I was told by Dynapack. Important things you guys should know is the TC (correction factor), and how they did the calibration for hub to rpm. It would also help if someone could get the dynapack files for all your dyno runs, that will have a text file with all data captured during the run. I somewhat doubt the curves would like the same as what porsche has released as that was done on an engine dyno and not a chassis dyno. Chassis Dyno values vary enough between dyno types, let alone comparing engine vs chassis plots. The dynapack is a great tuning dyno as it is load based and not a inertial dyno. Anyhow, if you get the .pts files from Rick I can tell you guys a bit more about your pulls. If you have other specific questions, let me know...

Pete</strong><hr></blockquote>


This is very interesting...I asked Rick if it was correcting based on the temp readings and such and he said no. The temp monitor was right by the computer monitor and was reading 90 degrees F. If torque is not corrected and HP is, then it would make sense that my HP would be so much higher than torque...However this does not explain why this doesn't hold true for everybody else...

What is the formula for SAE correction?? The calibration for hub to RPM I believe they plugged in the gearing...they may have done more but not to my knowledge...but I didn't ask. I'll see if I can get the .pts file... The TCF as shown on my dyno charts is 1.00.

EDIT: I did my own little SAE correction test. I plugged in various torque and rpm values from the graph...and all the hp values I got from doing this were 5-10hp lower than what I got on the graph. When I plugged hp into the formula and did a backwards calc, i got similar results...5-10lb/ft of torque that would have had to exist for me to get those hp values, uncorrected.

OK, so we found where 5-10 hp came from...what about the other 20-25?

thanks!!

Oh, and I figured out how to test if I have stock chips or not. If I get an MBC and crank up the boost I should see the overboost protection right? Well if they are actually not-stock chips...I won't see any overboost protection!

951porsche, do you know if there's any way to turn off SAE correction?

Alan C.

I don't know about the rest of you but this thread is tough to read. I have to scroll back and forth to try to read the posts. It must be 1.5 screens wide

Alan

adrial

Alan, I agree. I'm at 1280x1024 so I can get it big enough to get all the text on one screen...but it is big, probably because of the images. Thought it was just me but apparently not.

I'll make a new post