VE Table Values Who knows
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Teching In
Joined: Aug 2002
Posts: 2
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From: Melbourne Australia
VE Table Values Who knows Is there any one out there who has had success at how the Values in the VE table for LS1EDIT are derived. I have spent hours and hours trying to work this out but can't come up with logical results. At the moment I am adjusting these values testing, adjusting, testing etc etc.
But I could be here for ever at this rate.
I have seen suggestions on other posts, but has anyone actually tried them because they don't work.
This is obvously for a MAFless tune.
But I could be here for ever at this rate.
I have seen suggestions on other posts, but has anyone actually tried them because they don't work.
This is obvously for a MAFless tune.
TECH Addict
Joined: Nov 2001
Posts: 2,207
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From: College Station, Tx
Re: VE Table Values Who knows I posted some info on an earlier post that definitely works for 93's and 94+'s converted to speed density. The theory is still sound, the reason it isn't working for LS1's is probably a matter of units - I have no idea what the units are/how the ls1 VE table is derived - it doesn't match any schema that I am familiar with. This precludes any sort of direct calculation.
You can still try using a multiplier technique though - put your car in SD with the stock table and log your MAP, RPM, and LTFT values - just driving around normally (try not to decell in gear, go into PE mode, etc. - let the car warm up to temp first).
Once you have a good amount (it will take quite a few) open them as a .csv in excel and format them into a pivot table with map on the y axis and rpm on the x axis. Group them so the unit spacing matches the stock VE table. Add ltft's to the center and tell it to average.
We now have a summary of average fuel trim corrections (in percent) for each point on the VE table. You will be short a few data points and will probably have to manually fill them in/interpolate the table - just follow the general trends. When you have a complete table you should enter you stock VE table into the spreadsheet. Now create a new table that consists of the stock values multiplied by the LTFT values (convert them to a scalar multiplier first - e.g. if you had 15% fuel added, multiply by 1.15 - if you had -15% fuel (fuel pulled out) multiply by 0.85). Multiply this factor by your stock table on a cell by cell basis. This will result in a new table - enter that table into the VE table in the pcm.
This allows you to tune the table without knowing what the units are.
Chris
You can still try using a multiplier technique though - put your car in SD with the stock table and log your MAP, RPM, and LTFT values - just driving around normally (try not to decell in gear, go into PE mode, etc. - let the car warm up to temp first).
Once you have a good amount (it will take quite a few) open them as a .csv in excel and format them into a pivot table with map on the y axis and rpm on the x axis. Group them so the unit spacing matches the stock VE table. Add ltft's to the center and tell it to average.
We now have a summary of average fuel trim corrections (in percent) for each point on the VE table. You will be short a few data points and will probably have to manually fill them in/interpolate the table - just follow the general trends. When you have a complete table you should enter you stock VE table into the spreadsheet. Now create a new table that consists of the stock values multiplied by the LTFT values (convert them to a scalar multiplier first - e.g. if you had 15% fuel added, multiply by 1.15 - if you had -15% fuel (fuel pulled out) multiply by 0.85). Multiply this factor by your stock table on a cell by cell basis. This will result in a new table - enter that table into the VE table in the pcm.
This allows you to tune the table without knowing what the units are.
Chris
