I'm currently running Maft-Pro speed density with Greddy 720 injectors. My main scale is at -25. I don't have a problem with WOT tuning but at idle if I tune it to 14.7 A/F the car tends to die if I press the gas lightly. Just cracking the throttle a small amount and releasing the RPM's raise slightly then drops, the car will shudder at the low RPM's before dying. If I tune the A/F ratio at idle to a more lean condition (16-17) the car won't die so easily when I press the throttle barley at idle but the car sounds terrible when the idle is set so lean. I was wondering if any of you other guys have any advice for tuning the Maft-Pro while running large injectors. Thanks.
Need advice for Maft-Pro with large injectors
- Thread starter johnnyddn
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dbsupra90 said:what is your base fuel pressure?
what version firmware do you have on the pro?
:withstupi
and why the heck do you need 720s?
whelp, there's one problem. ALWAYS check fuel pressure w/o the vac line on. the TSRM call outs on fuel pressure are "base fuel pressure"- I.E. w/o the vac line.
for your use, i would drop fuel press to <35 psi base....
for your use, i would drop fuel press to <35 psi base....
drjonez said:whelp, there's one problem. ALWAYS check fuel pressure w/o the vac line on. the TSRM call outs on fuel pressure are "base fuel pressure"- I.E. w/o the vac line.
for your use, i would drop fuel press to <35 psi base....
10-4
that's a lot of fuel pressure. id start with 32psi with the vac line off. i would also take a bit out of your mainscale. instead of -25% id go back to say around -10% or even back to 0% to see where you are. changing base fuel pressure that much you are gonna put a lot less fuel in the car than you have now.
also, i hope you are tuning w/ a wideband 02. just want to be sure.
ok, just wanted to be sure you were using a real wideband.
do you have a laptop? if so record a run and post it back here.
other than that, you can try to do a reset on the pro itself. be sure you write down your setting first.
edit- here is a quick vid of my car at idle and rev up to 6k w/ the pro and 680cc
http://videos.streetfire.net/search/project+06/0/161db5f8-8cac-4e13-9402-98ae016131da.htm
do you have a laptop? if so record a run and post it back here.
other than that, you can try to do a reset on the pro itself. be sure you write down your setting first.
edit- here is a quick vid of my car at idle and rev up to 6k w/ the pro and 680cc
http://videos.streetfire.net/search/project+06/0/161db5f8-8cac-4e13-9402-98ae016131da.htm
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johnnyddn said:Well I tried backing off the fuel pressure to around 35 but that didn't help. Also I am tuning with a LC-1 wideband so I know my A/F ratio's are good.
5 psi w/vac on isn't going to make much diff given how rich you're running....USE BASE FUEL PRESS!