Intake manifold modifications

NoDOHC · 08-02-2009, 04:33 AM

Update:

Right before the scheduled pull, I lost my leading plugs. I didn't have time to troubleshoot what had happened (corrupted something in Haltech trying to get a Tacho output working). I went anyway, as I was not willing to miss my appointment.

With no leading plugs, the car starts hard and has no low end (I didn't know why at the time).

Interestingly enough, the high end was fine.

First run of the day was 163 WHp and 123 lb-ft (13.8:1 11 degrees of timing (which I thought was 26, but I had the trailing plugs only)

Richened it up to 12.8:1, went to 181 WHp and 142 lb-ft

Gave it 10 degrees of timing (21 BTDC) went to 198 WHp 150 lb-ft

Richening to 12.2:1 and giving another 5 degrees (26 BTDC) gave 201.3 WHp and 150 Lb-ft

Made 3 runs at 12.2:1 and adjusted the timing around 3 degrees in either direction yielded 200.6 WHp and 203.2 WHp.

At this point, my clutch was starting to slip and I was running out of time, so I had to head home. It is really a pity that I had no leading plugs, as this would most likely have helped my low end torque.

Sadly, I probably won't dyno this car again until I get the turbo on it.

Dyno plots are yet to come.

08-02-2009, 04:33 AM	#21
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	Update: Right before the scheduled pull, I lost my leading plugs. I didn't have time to troubleshoot what had happened (corrupted something in Haltech trying to get a Tacho output working). I went anyway, as I was not willing to miss my appointment. With no leading plugs, the car starts hard and has no low end (I didn't know why at the time). Interestingly enough, the high end was fine. First run of the day was 163 WHp and 123 lb-ft (13.8:1 11 degrees of timing (which I thought was 26, but I had the trailing plugs only) Richened it up to 12.8:1, went to 181 WHp and 142 lb-ft Gave it 10 degrees of timing (21 BTDC) went to 198 WHp 150 lb-ft Richening to 12.2:1 and giving another 5 degrees (26 BTDC) gave 201.3 WHp and 150 Lb-ft Made 3 runs at 12.2:1 and adjusted the timing around 3 degrees in either direction yielded 200.6 WHp and 203.2 WHp. At this point, my clutch was starting to slip and I was running out of time, so I had to head home. It is really a pity that I had no leading plugs, as this would most likely have helped my low end torque. Sadly, I probably won't dyno this car again until I get the turbo on it. Dyno plots are yet to come. __________________ 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)