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Injectors too big?
Posted: Tue Oct 26, 2010 6:13 pm
by hiperf402
I have a sbc 355 with twin turbos. Calculations called for 60 lb/hr injectors which I have installed. Problem I have is hard starting. Have to clear flood to get started. My ve analyze live autotunes cells at idle to 5's and 7's for 14.0 AFR and injector pw is around 1.2ms. Is this telling me that my injectors may be too big. Shouldn't my injector pw be around 3.4 or more?
SBC 355
Twin T04E turbos .63 a/r turbine and .60 a/r compressor
MSII running 2.891
Tunerstudio
Techedge wideband 02
Re: Injectors too big?
Posted: Wed Oct 27, 2010 3:56 am
by Matt Cramer
I think you've set the opening time too high, so even with a pulse width equal to the opening time it's dumping in a bit too much fuel.
Re: Injectors too big?
Posted: Mon Nov 01, 2010 2:23 pm
by hiperf402
Sorry for the delay Matt. I know you stay very busy. I uploaded my tune here. Could be way off though. I am still working on it.
Your thoughts on it are very much appreciated.
Re: Injectors too big?
Posted: Mon Nov 01, 2010 2:28 pm
by hiperf402
Don't know if these will help. Probably just trash.
Re: Injectors too big?
Posted: Tue Nov 02, 2010 4:11 am
by Matt Cramer
Hard starting is going to be a matter of dialing in the cranking pulse widths. I see you've backed down the opening time; you'll probably need to retune that VE table now as it seems you have patches where it's running pretty much off the opening time and not the VE table.
Re: Injectors too big?
Posted: Tue Nov 02, 2010 11:11 am
by hiperf402
Thanks Matt. I'll work on it.