The quest for more torque
Join Date: Sep 2008
Location: Sheboygan, Wisconsin
Posts: 855
Rep Power: 17
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Update:
Got the new clutch (It looked pretty neat, I may get some pictures up later).
Installed Turbo drivetrain in the car.
Pedal effort is a little high, but the engagment is very smooth (as long as you don't try to drive gently).
The new tranny is excellent (has synchros in all gears!!)
After I finished with the drive train swap, I decided to take the car to the dyno again (more money...)
Unfortunately, I had to give up my easy turning transmission, my ultra-lightweight flywheel, etc so I figured that I would lose a couple wheel horsepower.
I was happy as a clam when I put down 203 WHp and 152 Wlb-ft of torque on my first run (Identical numbers to last time). I then decided to adjust the ignition timing some more.
Here is a summary of what I found
Ignition Advance at 8000 (Degrees BTDC),Peak Power,Peak torque
38,203,152
43,198,154 (I think the torque was inaccurate)
33,198,148
So now I decided to try fueling.
AFR (Average),Horsepower,Torque
12.5,203,152
12.8,210,155
13.0,216,158
13.3,216,160
13.8,200,145
Going back to 13.3:1 I started adjusting trailing split
Trailing split (degrees),Horsepower,Torque
15,216,158
10,216,158
5,216,159
0,216,160
-5,212,157 (I swapped leading and trailing plug wires for this test).
So peak power was 216.4 WHp at 7575 rpm and 160.2 Wlb-ft at 6100 rpm w/ 38 BTDC timing, 13.3:1 AFR,0 degree split.
(The glitch in the air fuel chart was corrected later, but after the AFR was steady, we quit including it on the trace.)
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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