How do you acount for the injectors getting smaller under boost? Or does the EFI live custom OS acount for this in the IFR table? Or do you just tell the pcm that it has more airflow than reality, and acheive the additional fueling in that manner?
Either way, 1000hp on a stock pcm hardware is an impressive feat.
Tdorne... have you tried subtracting .2 from the small pulse adjust from a 1.70 commanded and below? This WILL knock the pulse width down to 1.50. when the pcm is commanding 1.70 or below.
If a boost reference regulator is not used you must scale the IFR table proportionatly to compensate, not just put in a standard value all the way down. That is how the pcm knows to add or subtract more fuel based on manifold pressure.
'71 chevelle
Twin turbo ls1
1000 HP 93 octane street car!
96 lb injectors
I've been working on a similar issues with the SVO 42's. Seem like at 1.7 or less IPW, they just quit flowing.
You can see it in the logs, as things get real lean real fast like. I redid my minimum pulse so I get no smaller than 1.8 and that seems to work well.
What fuel pressure are you running? You should not be rich with that injector if I am getting a 96 to idle lean??? Have you played with the IFR??
'71 chevelle
Twin turbo ls1
1000 HP 93 octane street car!
96 lb injectors
I'm waiting on my fuel pressure sender to arrive as we speak. But I'm guessing around the stock 58psi range.
Andrew
EFILive Crew
Originally Posted by nitrorocket
Have I played with it??? I've beat it up against the wall
I have 63 psi at idle, drops to 53 under WOT. This condition usually occurs under light decel (not enough to engage DFCO) with 63 psi fuel pressure.
Tordne's car is stock in the fuel department (other than the injectors) and demonstrates identicle behavior.
Seems the 1.8 pulse is a tad too much and cause's a slightly rich condition - BEN's around .94 and at 1.7, it goes very lean, BEN's in the 1.20's. makes me think the SVO's don't support a small pulse width very well.
What is the cobra fuel pressure??
'71 chevelle
Twin turbo ls1
1000 HP 93 octane street car!
96 lb injectors
Not sure. Good question though (KISS)
I scaled the injectors using 43.5 as rated. BEN's didn't change afterwards
The SVO pintle injector has no where near the low end control the delphi plate injectro has , you can get big plate injectors down to about 1ms without to many issues , getting a pintle injector below 2ms is a headache.
We stopped using the Ford SVO injectors about 2 years ago due to these issues.
Where do you get your Delphi injectors from Delco?
Andrew
EFILive Crew
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