VE tables and timing
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 59
From: Fremont Oh
Re: VE tables and timing (AS84)
AS84,
I use LT1 edit im sure others may chime in but at least with the LT1's we generally don't do any changes with the VE , generally timing and perhaps the fuel enrichment..
hope this helps
Mo
I use LT1 edit im sure others may chime in but at least with the LT1's we generally don't do any changes with the VE , generally timing and perhaps the fuel enrichment..
hope this helps
Mo
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Re: VE tables and timing (AS84)
Changes in the VE tables can be either adding or removing fuel. Generally this is done in Speed Density MAP based systems. I would get the fuel map done first then fine tune by moving on to the Spark Tables for PArt throttle
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Re: VE tables and timing (AS84)
It is not necessary to take out timing if you take out some fuel in the VE tables. It is best as the other forum member mention to make small changes one at a time and then datalog to see the cause and effect of your changes. If you make to many changes all at once you won't know which change really made the difference for either the good or the bad.
Are you having problems with the idle speed? Changing the cold start enrichment typically will not change the idle speed. Unless for some reason the enrichment is so far off that its affecting the idle speed. First of all I would make sure that I didn't have a mechanical problem causing idle degradation (if this is your problem) before trying to make any tuning changes. No amount of tuning can fix a mechanical problem other than bandaiding it temporarily. If you have an cold idle problem make sure that there are no vacuum leaks, injector issues, sensor issues or fuel pressure issues.
Are you having problems with the idle speed? Changing the cold start enrichment typically will not change the idle speed. Unless for some reason the enrichment is so far off that its affecting the idle speed. First of all I would make sure that I didn't have a mechanical problem causing idle degradation (if this is your problem) before trying to make any tuning changes. No amount of tuning can fix a mechanical problem other than bandaiding it temporarily. If you have an cold idle problem make sure that there are no vacuum leaks, injector issues, sensor issues or fuel pressure issues.
Thread Starter
Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
Re: VE tables and timing (tjwong)
no mechanical problems. I recently switched from a super ram to a single plane efi and the flow characteristics really effected my map sensor. I seemed to have fixed my cold idle issue by pulling more fuel out (3%) in the VE table from 400-900 rpms at 40-55 kpa. It idles better but due to rain I was unable to datalog. It seems as though every small change effects the IAC slightly. I also zeroed out the startup enrichment table and now it starts up on the first crank......something it has never done.
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