Scaling IFR to - LTFTrims for 60lb injectors-26%!!!
06-04-2006, 10:26 PM
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Scaling IFR to - LTFTrims for 60lb injectors-26%!!! I plugged in Redhardsupra's injecter scaling spreadsheet. Got my values. fired the car up did some logs and the car was never in the negative. Anyway to make a long story short-had to scale the injectors almost 26%( or mulitpy by .74) to get an average value of -5 to -8 for LTFTm's. This on a 02 Z06 with a A&A P1SC -FMIC, 224/230 cam, headers, 317 heads. Still running factory 1 bar and I was told by almost anyone who tunes blower cars to leave the VE and MAF alone until I go 2 bar-does this sound right?
06-05-2006, 09:31 AM
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Averages are for ****. They obscure reality and hand
you a steaming pile of statistics. You want to look cell
by cell and fix what is wrong, where it's wrong. With
headers and cam you have a lot of change to low end
and mid-range VE and I think you should set the
injectors back to the mathematical result (after you
sanity-check it) since these are simple pieces with
predictable behavior (know your fuel pressure). The
MAF is probably not needing work unless you messed
it around physically, or it's descreened in a bent
intake (like crazy blower plumbing...). But the MAF is
a bit player in the lower RPM and if your bad trims are
around idle and low pedal it's the VE table, straight
from the cam. The work you do should not be wasted,
the VE results are transferrable to the lower half of
the enlarged 2-bar table later and a swell place to
start, with that. I'd go see if you can find a blower
& cam car tune file on the repository site, and rip off
the VE tables from that as a starting point.
you a steaming pile of statistics. You want to look cell
by cell and fix what is wrong, where it's wrong. With
headers and cam you have a lot of change to low end
and mid-range VE and I think you should set the
injectors back to the mathematical result (after you
sanity-check it) since these are simple pieces with
predictable behavior (know your fuel pressure). The
MAF is probably not needing work unless you messed
it around physically, or it's descreened in a bent
intake (like crazy blower plumbing...). But the MAF is
a bit player in the lower RPM and if your bad trims are
around idle and low pedal it's the VE table, straight
from the cam. The work you do should not be wasted,
the VE results are transferrable to the lower half of
the enlarged 2-bar table later and a swell place to
start, with that. I'd go see if you can find a blower
& cam car tune file on the repository site, and rip off
the VE tables from that as a starting point.
06-05-2006, 09:38 AM
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So bro are you saying that I should set the injecters back to "plugged in value" , the disable the maf and do a ve tune-then scale the maf to match? This is the write up that's founds in the help file of the latest HP right? I asked the fellow who wrote this and he told me not to do this for a blower car?
