knock knock goes the jeep....

[CSH-HQ]

Did you mess with the EST recovery rate?.
Interesting strategy.
Grumpy


>If you have Terry Kelly's GMe Pro you can print the actual spark map and
>plot where on it you were with rpm and load and plot the actual advance that
>the ecm should be putting out.  If it is different then you could be
>experiencing PE spark advance, or HWY spark advance or HWY fuel problem.
>>From what little experience I have with a friends 89 TPI with Vortech, we
>pulled the boost retard out and allowed the ecm to take out up to 14 deg of
>timing when in pe and with only about 5 psi of boost the ecm rarely pulled
>out more than 5 deg of timing when on the throttle and the car ran much
>better without the boost retard.
>
>I graph (Using diacom) rpm, LV8 and spark knock, 02 sensor voltage,
>commanded afr and tune the spark map from there.  I have also noticed that
>the 02 sensor still reads high (Over 850mv)  but the car just seems to lay
>down if it's not rich enough.
>
>Took me a while to find PE spark advance (Now all zero'd out) and I have
>been playing with hwy spark and hwy fuel.  I only put in about 4 deg of hwy
>spark and have hwy fuel set at  16.0 to one.  It seems to surge a slight
>amount on very slight decel, but other than that, no detonation.
>
>Hope this helps.
>
>Mark
>-----Original Message-----
>From: Peter Fenske <Peter_Fenske at bcit.ca>
>To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>Date: Thursday, December 30, 1999 9:25 AM
>Subject: Re: knock knock goes the jeep....
>
>
>>
>>
>>Hi John
>>
>>Been a while but I think you gotta disable the hwy spark..
>>What happens GM tries to eak out the best CAFE MPG by advancing
>>the timing at steady state.. Also there is a hwy fuel enleanment
>>function which can give you AFRS of 17 to 1. all for MPG.
>>
>>I am not sure if these functions are enabled in your cal.. check em out
>>
>>:peter
>>
>>
>