11 to 11.5 for safe afr in boost. Better more fuel than less, mine spikes to 10 sometimes before it levels off to 11ish.
V3 Install Under Way Finally
- Thread starter JD1964
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84Ttop sold me the V3 kit and Pro M Maf for my 30lb injectors. He also sold me the SCT chip which he pre programmed for initial setup. In all fairness to him, I changed the equation by going from a 6" blower drive to a 6.87" blower drive. It seems to me that this might be the thing that bumped his initial settings slightly under par. The extra boost from the larger pulley affected fuel delivery on the top end. So initially, it seems that bumping the pressure up is a quick remedy. In the end, I may be driving it to NJ for some dyno tuning.
Does this make sense?
84Ttop, is it acceptable for me to run higher pressure to find the sweet spot given the combo of things I currently have, or, am I suffering any loss by not re burning the chip?
Does this make sense?
84Ttop, is it acceptable for me to run higher pressure to find the sweet spot given the combo of things I currently have, or, am I suffering any loss by not re burning the chip?
Raising the base pressure in essence is doing the exact same thing as what an FMu does under boost except you don't have yours at 80 psi yet lol . The chip is still gonna try an go for its programmed parameters to meet what it's told it should be AFR wise . It sounds like by how little it's off that the extra boost could be causing it to run slightly lean . Either way the ride to the dyno is well worth it in my opinion .
Sent from my iPhone using my fingers while my auto correct makes me seem illiterate
Also, I reported earlier in this thread that it was way lean at idle initially. That is actually wrong I think. It was just an initial start up condition where the PCM was figuring things out. Initially it was actually surging back and forth between rich and lean. It fixed itself on that respect.
Like I said though, right now, at 50psi (setting with vacuum line disconnected), it gets to 12:1 AF at WOT.
Like I said though, right now, at 50psi (setting with vacuum line disconnected), it gets to 12:1 AF at WOT.
You have that fmu still? Slap a 6:1 disc in it, or tune it if it's a super fmu. To get the afr down a bit. It's archaic but will work just fine.
I still have the FMU that came with the kit. Would installing that be a better alternative that raising overall rail pressure like I've done so far?
It will bring the afr down only when in boost. So your idle and cruise afr will not be effected. It will raise fuel pressure when the boost comes in.
I'm not suggesting adding an FMu . That's the point of having a chip , real injectors and the pump to supply it . I was just comparing what you were doing raising the pressure to what a FMu does to the Injectors as its working . FMu is a bandaid . I'm sure nick can fix you right up with the turn aspect of it as it seems the table in boost up top just needs to be richend up some more .
Sent from my iPhone using my fingers while my auto correct makes me seem illiterate
Sent from my iPhone using my fingers while my auto correct makes me seem illiterate
I agree but it will let him drive the car safely for now until the tune is done.
What heat range plugs are in it?
I will get plug part # for you and post back. Is there an inclination to go colder than what stock calls for in boosted applications?
I'm ok with a 12:1 af with only 6 lbs but base timing needs to be 10 degrees. Typically 11.8 is the goal for great performance, 11.3-11.5 keeps you in the super safe zone imho
If the base pressure is raised, then the computer will just shorten the duty cycle at lower rpm, it will not cause it to run rich.....that is unless you have some huge amount of fuel pressure, way above where he is now. I suspect that the injectors are about maxed out if he is needing fuel pressure to get the AFR richer.
Joe
Joe
mikestang63
SN Certified Technician
I would not add back the FMU. use the tune Nick gave you and let the computer learn it. Just don't put the pedal through the firewall untill you get it dialed in.
I wish mine would learn. Mine is not tuned for boost. Any small adjustment to my fuel pressure changes my afr even at idle and cruise....
BAMA TUNES!
BAMA TUNES!
mikestang63
SN Certified Technician
I wish mine would learn. Mine is not tuned for boost. Any small adjustment to my fuel pressure changes my afr even at idle and cruise....
bama tune....amazing how they manage to sucker people in with their phony "tune for life" bs
If the computer can learn to cut the pulse width for cruise and idle as Joe says, I see nothing wrong with a few more lbs of rail pressure to get me in the sweet spot at WOT. I don't need much. .5 in the AF is all the additional I really need. Slight FP adjustment should bring that. Gonna set timing to 10 tomorrow and bump up pressure a tad more.
I know the tune was done years ago when I did a lmaf. Now they won't touch the tune... now they only do "bolt ons".
Right but isn't it true that they advertise up front that they do not do custom tunes?
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