V/e Changes After H/c Install ?
11-21-2005, 07:56 AM
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V/e Changes After H/c Install ? How many people have had to change the V/E tables after a h/c install ? I am having a problem with hot starts. The v/e tables have been changed to 85% on 400, 800, and 1200 rpms. should it be set back to stock settings ? Any help in this matter will help me sleep better.
Thanks, C5JIM
Thanks, C5JIM
11-21-2005, 08:14 AM
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I had the same problem and was able to cure it by bumping up "Idle Airflow Park" up a point across the board (grams/sec) and raising my idle to 900 rpm.
I also lowered my VE table by 30%@400, 20%@800 and 10%@1200.
I also lowered my VE table by 30%@400, 20%@800 and 10%@1200.
11-21-2005, 08:20 AM
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The shaving of the VE low end is not something to
do by "rule of thumb", every cam with different LSA
(overlap) and duration will want a different profile.
Also the VE depression on larger ones may extend
up as far as 2000RPM or so.
Starting also wants you to look at the cranking VE
table, this covers the even-lower RPM and needs
to be roughly right and consistent with what you
did to the running VE table(s) - probably further
depressed at the cranking RPM range.
do by "rule of thumb", every cam with different LSA
(overlap) and duration will want a different profile.
Also the VE depression on larger ones may extend
up as far as 2000RPM or so.
Starting also wants you to look at the cranking VE
table, this covers the even-lower RPM and needs
to be roughly right and consistent with what you
did to the running VE table(s) - probably further
depressed at the cranking RPM range.
11-21-2005, 09:19 AM
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Me on the other hand I really didnt have to do the scaling in the 400 800 1200rpm columns. I found that once I had the car in SD mode and was able to log my LTFTs during drives to and from work, I adjusted my VE table to get my LTFTs between 0 and -4 and from that day forward I never seemed to have a problem with hot starts. I manually smoothed the VE table for values that I obviously couldnt not get LTFTs for like anything in the 400 column.
But looking at how much ive learned, not sure how I managed to fix it because technically at idle when the LTFTs are being logged im looking at fuel cell 20-22 and technically you dont want to be making adjustments for those cells based on those values coming from those fuel cells.
Dixit
But looking at how much ive learned, not sure how I managed to fix it because technically at idle when the LTFTs are being logged im looking at fuel cell 20-22 and technically you dont want to be making adjustments for those cells based on those values coming from those fuel cells.
Dixit