Has anyone got an xdf for ddrh that has decel fuel cut in it.Im tuning one and it surges on decel and when scanned you can see the decel fuel cut going on and off in time with the surge ive tried everything else to stop it and would lick to turn decel cut off as you can see the mixtures go lean on the dyno when it does it.Ive noticed a lot of supercharged cars do it so id like to see if i can get rid of it.
Cheers Shane
VT V6 1.9 $a5k decel fuel cut
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yoda69
- Posts: 1226
- Joined: Sun Mar 15, 2009 10:20 am
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2004 VYII Berlina sedan V6 Auto
2005 VZ Monaro CV8 manual - Location: Geelong, VIC
Re: VT V6 1.9 $a5k decel fuel cut
Try the following for DDRH
$51B2......X*25............RPM High, above this DFCO active. In DDRH is $29 = 1025 RPM
$51B3......X*25............RPM Low, below this DFCO inactive. In DDRH is $28 = 1000 RPM
Earlier bins had these set higher, but there are also other parameters that affect DFCO (mgc, vehicle speed, tps, etc.)
Having said that, if you increase the High setting to $FF, DFCO would only be enabled above 6375 RPM, would also up the low setting to $FF to ensure all is OK.
Good Luck,
yoda69
$51B2......X*25............RPM High, above this DFCO active. In DDRH is $29 = 1025 RPM
$51B3......X*25............RPM Low, below this DFCO inactive. In DDRH is $28 = 1000 RPM
Earlier bins had these set higher, but there are also other parameters that affect DFCO (mgc, vehicle speed, tps, etc.)
Having said that, if you increase the High setting to $FF, DFCO would only be enabled above 6375 RPM, would also up the low setting to $FF to ensure all is OK.
Good Luck,
yoda69
Re: VT V6 1.9 $a5k decel fuel cut
Problem solved you were spot on yoda turned of dcfc smooth as silk on coast down.I rewckon this is a fault on most s/c cars as this isnt the first s/c car that ive felt it on.Thanks for the quick reply cars off the dyno ,tuned and a happy customer.(Made 170rwkw not bad for 10psi).
Thanks again Shane
Thanks again Shane