J N's MiniRam backfire

[Walter Sherwin]

Backfire when exactly.  During throttle opening or closing maneuver?  The
short burst of data below is a bit inconclusive.

Walt.



> Jason sent me an XLS spreadsheet with data from a scantool that shows a
> backfire happening when he blips the throttle.  Car = 1987 Vette w/
MiniRam.
>  Its pretty interesting.  (Jason, I am posting here because I can't find
> your e-mail, thirdgen appears to be down, and I also want to share this
> info with others here).
>
> The data clearly shows Jason 'blipping' the throttle from off idle.  There
> are 4 data points on the throttle blip and you can clearly see the O2
volts
> going from the switching behavior at idle (TPS=0.53V) to 0mV on a Throttle
> blip.  The data is below.  This appears to be a fueling issue (expecially
> when viewing the SA in relation to the throttle blip and LV8).  Its
undetermined
> as to whether or not it is a PROM fueling issue or a mechanical fueling
> issue.  What do you guys think?
>
> RPMs,TPS, O2, AFR, Knock, SA, LV8
> 875, 0.530, 836, 14.7, 0, 25.4, 57
> 875, 1.630, 712, 11.7, 0,13.8, 189
> 875, 3.310, 292, 11.7, 0,15.9, 177
> 1300, 2.94, 0, 11.8, 0, 28.2, 175
> 1725, 0.90, 13 ,14.7, 0, 45.5, 124
>
> Jason - quick question for you.  The MiniRam has ZERO provisions for EGR.
>  What PROM are you running?  Are you running $6E code, $32B code?  Is your
> PROM image based off an original TPIS image or did you start with the
stock
> image as a base?
>
> A separate issue is that IMHO, knock -should- be detected and isn't.
>
> Tim

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