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Join Date: Sep 2009
Location: Hillsboro, OR
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Opinions on my AFR curve?

I pulled the car out of storage today and did some data logging, and would like some expert opinions on my AFR curve. As background, my car is nominally a stock '87, with a fabspeed muffler and andial intercooler. Last year I replaced the injectors and the rear pump with stock pieces from our host. The lambda system is still in place, although I have the O2 sensor disconnected.

From what I've read here, a stock car should be dropping to low 10's or even high 9's at peak boost, and lean out to low 11's or so at max RPM. I'm in the low-mid 11's at torque peak. Should I be worried about this?



Backing HP and torque out of the accelerometer data from my LM3, and assuming 15% drivetrain loss, I'm seeing the following curves. Seems in the right ballpark to me with these simple mods.



Last edited by pdx930; 03-08-2015 at 09:21 PM..
Old 03-08-2015, 09:09 PM
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You dont want to be in the 9s or 10s at any point. Your number look great for a stock car.
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'86 930 Guards Red - EFI MS3Pro, 80lb inj, 3.4, GT35R, Tial 46, Bosch 044, B&B Headers, 3.2 carrera manifold, Turbokraft Full bay IC
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Old 03-08-2015, 09:20 PM
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You dont want to be in the 9s or 10s at any point. Your number look great for a stock car.
Ditto.

From my experience, 9's yield severe loss of power and misfires.
Old 03-08-2015, 09:43 PM
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If that is accurate (WB) data then you have extremely good tune!
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79 930: HX40Super, MS3pro+ID1000+044+E85, Ignition: 123/TUNE/MSD6A, BB+2*turbosmart38, WMI. Weight 1110kg
Old 03-08-2015, 10:37 PM
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Looks great to me, I would leave it....
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Old 03-09-2015, 10:25 AM
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Thanks guys. That makes one less project for this spring. Moving on to tearing out my noisy ER polybronze bushings in the spring plates and refreshing the brakes.

Old 03-09-2015, 04:29 PM
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