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Old 07-30-2010, 01:17 PM   #23 (permalink)
Tygen1
Master EcoModder
 
Join Date: Dec 2008
Location: South Jersey
Posts: 553

Little Blue - '98 Ford Escort ZX2 Cool
Team ZX2
90 day: 44.75 mpg (US)

Big Red - '00 Ford Excursion XLT
90 day: 15.53 mpg (US)
Thanks: 5
Thanked 45 Times in 29 Posts
Opps, I forgot one thing...let me elaborate.

Less power means a higher TPS which the PCM thinks means a higher load which normally means pulled timing. Typically our PCM's are designed to not have as much ignition advance as they could run. Short of buying nice software to reporogram the PCM, I ended up fooling the PCM into thinking it was at a lower load, even if the TPS was high. You may have read some threads I had about the vacuum leak giving me better mpg. Once I got the wideband I found that I was not lean like I thought, it was simply just more ignition timing. The vacuum leak made the PCM not believe the MAF and therefore it determined I must be at a lower load and that advanced the timing to near max. When this was coupled with the HAI, that's when I started to see the nice low GPH's and tremendously improved highway mpg. The ZX2 is starved for timing. With the lean burn set up I am using now, I am just bleeding off voltage from the MAF, which no doubt makes the PCM believe there is a light load. So I see max advance when bleeding off voltage from the MAF.

This may help you, but I don't know how your Saturn will react?
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