HELP Running lean with 50lbs injectors

04 Mach1 · 11-18-2005, 04:39 PM

I have recently went to a set of 50lbs injectors and now running extremely lean. I got the maf recali for the 50's increased fuel preasure to 43. The car run great with 30's and a FMU. I am sure they are 50's. Is there a way to check the maf voltage? and if there is what should the voltage be with the 50's and the recali? Any Suggestion?

fireguy50 · 11-18-2005, 05:13 PM

recal's loose their accuracy the larger (injector) you go.
What is your dyno numbers?
Go back to smaller injectors or use tuning software to get everything sorted out.

04 Mach1 · 11-18-2005, 06:18 PM

Yes I understand the loss cali with the larger injectors. I thought that it would have a problem idling by running rich but with these its running lean thoughtout the dyno pull. I talk to Blake and he runs kinda the same setup with no problem. Is there away to check the maf without sending it in?

QWKSNKE · 11-18-2005, 09:01 PM

Are you running any kind of tuning software or are you just trying to correct it with fuel pressure? What kind of MAF are you using?

Scothew · 11-18-2005, 09:44 PM

He's trying to correct through a AFPR and a A9L with no tuning devices. Marc came out to the TMS dyno day, I wish I had gotten the run files from Blake to post up. Maybe I can once Blake gets his internet working again.

Also I think its a Pro-M maf, but unsure as to what model.

fireguy50 · 11-18-2005, 10:56 PM

what were the dyno #'s

QWKSNKE · 11-19-2005, 03:57 AM

Quote:

Originally Posted by Scothew

He's trying to correct through a AFPR and a A9L with no tuning devices.

uh oh

You can't do that now if you are at the power level to require that high of an injector (not safely anyways) Time to pay somebody to tune it or to get a tunable setup

Wicked · 11-19-2005, 07:53 AM

Quote:

Originally Posted by QWKSNKE

uh oh

You can't do that now if you are at the power level to require that high of an injector (not safely anyways) Time to pay somebody to tune it or to get a tunable setup

Right.

Is he still running an FMU?

Just because he has 50's and the MAF is cal'ed, he still has to have some way to increase the injector pulsewidth(software) or increase the fuel pressure(FMU) as the boost comes on. I'm assuming there is boost involved or you wouldn't need 50's.

Only difference between the 30's and 50's is he won't need as much FMU ratio and his base fuel pressure will not have to be as high.

QWKSNKE · 11-19-2005, 08:42 AM

Quote:

Originally Posted by Wicked

Right.

Only difference between the 30's and 50's is he won't need as much FMU ratio and his base fuel pressure will not have to be as high.

He could probably run a BAP and do fine but I would still recommend a good tune with it though

04 Mach1 · 11-19-2005, 09:51 AM

Not running any tuneable software. Have a 75mm pro-m bullet. No longer using fmu have regulator with a 1.1 ratio. BAP?????? I have the dyno sheet I'll try to load.

11-18-2005, 04:39 PM	#1
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	HELP Running lean with 50lbs injectors I have recently went to a set of 50lbs injectors and now running extremely lean. I got the maf recali for the 50's increased fuel preasure to 43. The car run great with 30's and a FMU. I am sure they are 50's. Is there a way to check the maf voltage? and if there is what should the voltage be with the 50's and the recali? Any Suggestion?

11-18-2005, 05:13 PM	#2
fireguy50 Senior Member Join Date: Sep 2005 Location: MI Mental Health Dept Posts: 182	Re: HELP Running lean with 50lbs injectors recal's loose their accuracy the larger (injector) you go. What is your dyno numbers? Go back to smaller injectors or use tuning software to get everything sorted out. __________________ Ryan J McCormick Parts replacement is not auto repair, if you can't diagnose, don't open the hood!

11-18-2005, 06:18 PM	#3
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	Re: HELP Running lean with 50lbs injectors Yes I understand the loss cali with the larger injectors. I thought that it would have a problem idling by running rich but with these its running lean thoughtout the dyno pull. I talk to Blake and he runs kinda the same setup with no problem. Is there away to check the maf without sending it in?

11-18-2005, 09:01 PM	#4
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: HELP Running lean with 50lbs injectors Are you running any kind of tuning software or are you just trying to correct it with fuel pressure? What kind of MAF are you using? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

11-18-2005, 09:44 PM	#5
Scothew Censored Jihad Join Date: Dec 2004 Location: B'ham, AL Posts: 4,108	Re: HELP Running lean with 50lbs injectors He's trying to correct through a AFPR and a A9L with no tuning devices. Marc came out to the TMS dyno day, I wish I had gotten the run files from Blake to post up. Maybe I can once Blake gets his internet working again. Also I think its a Pro-M maf, but unsure as to what model. __________________ Theres only one way to get to Carnegie Hall..... .... Practice.

11-18-2005, 10:56 PM	#6
fireguy50 Senior Member Join Date: Sep 2005 Location: MI Mental Health Dept Posts: 182	Re: HELP Running lean with 50lbs injectors what were the dyno #'s __________________ Ryan J McCormick Parts replacement is not auto repair, if you can't diagnose, don't open the hood!

11-19-2005, 09:51 AM	#10
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	Re: HELP Running lean with 50lbs injectors Not running any tuneable software. Have a 75mm pro-m bullet. No longer using fmu have regulator with a 1.1 ratio. BAP?????? I have the dyno sheet I'll try to load.