BluByU

Now that I;ve got the fuel tables pretty much in line I'm moving over to adjusting the spark tables... I've noticed at a rolling idle (car in drive, foot off brake, without pressing the accelorator pedal down - the car begins to move like most cars do... however, it surges.. or should i say rolls.. the rpms go up than down then up then down.. only about a 100 rpm or so.. but enough that it effects the speed of the moving idle.. barly

I'm not an expert, but it seems to me this would indicate to much timing in this location of the spark table.... also at crusing speeds i think i feel a itty-bitty surge... could that be because of the EGR? I still have the EGR active even though I have a cam with a much larger overlap than stock.. I tried turning the EGR off to try and eliminate this with this spark table with no success...at this point should I leave it off or turn it on

Here are the spark tables I'm running... see sig for cam specs! (CLICK TO ENLARGE)

Spark. Vs RPM Vs Load (0-4000RPM)


Spark Vs RPM Vs Load (4000-7500RPM)


Coolant Temp vs. Spark




what am I doing wrong?

BluByU

BTW: As of yesturday I programmed in LT4 GS corvette tables.. the car runs about the same (event with tons less timing) but it still has a slight surge at cruise speeds (same as before).. be it 30mph or 65mph.. I thought it could be a leaking TB gasket since I reused it which adjusting the bypass hole.. so i installed a fresh one I had lying around the garage.. this solved nothing.. could this ever so slight surge be caused by the A/C compressor engaging and or the alternator?

I dropped quite a bit of timing (see below) with little effect to performance and or surging.. before that I had tried eliminating the EGR but that didnt help either...

here is the table which illustrates the difference between the GS table which i'm running now and my old table from PCMFORLESS..


values shown are how much less timing i'm running now in the indicated spark cell..




wtf :mad

BTW: The surge is less than 100rpm at any given cruise speed..

11sORbust

if you have datamaster then send me the log, I'll look it over.

BluByU

I'll log one tonight and send it to you..

11sORbust

Make sure to capture your car while it's acting up. When you email me the log make sure to tell me the record number it starts to "surge".

BluByU

gotcha

your email address is locked on the board.. so i don';t know where to send it.. I also tried your web address but that dosent work either..?!?!