Tuning
From the Dynorad, before tuning on the dyno...
Maximum Horsepower (SAE Net)-
153 @ 3500 (my Saab currently)
135 @ 3,500 rpm (stock Saab)
Maximum Torque Range, ft/lbs.-
229 @ 3500 (my Saab currently)
160-172 @ 3500 rpm (stock Saab)
Drag data from the Dynorad:
Then I baselined the car and the Dynorad by getting on a local shop dyno. Here are the results. Shop dyno on the left and Dynorad on the right.
Max HP in 3rd gear:
Dynorad - 242hp
Dynojet - 151hp
Max Torque in 3rd gear:
Dynorad - 256 ft-lbs
Dynojet - 170 ft-lbs
The Dynorad tracks the shop dyno pretty well, although with a significant offset. Since I was running on a steel drum, rather than down the street, the offset could be a combination of missing drag and transmission losses. One thing missing from the Dynorad data is the Air/Fuel ratio, which would really be nice.
I retarded the timing a couple degrees for runs 4 & 5 and picked up about 20hp. There's some weird things going on in the A/F ratio. It's running real lean and then runs pretty rich. Hmmm, more to do.
OK. I know what the difference is now. The "mass factor" was set to 23 in the Dynorad. That's correct for a 1st gear pull, but I was in 3rd. When I changed it to 7, then the results were much more alike. I'll post an updated chart when I get a chance.
Page 1 - Summary
Page 2 - Tuning
Page 3 - Wheels
Page 4 - Water Injection
Page 5 - Brakes
Page 6 - Interior
Page 7 - H.I.N.
Page 8 - Racing
