I Need Help!!!
06-28-2004, 03:50 PM
#1
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I Need Help!!! I have the problem posted in the PCM/tuning section but since it is a FI car and probably is FI related I posting a link in the FI forum too.
I NEED HELP!!!!
I NEED HELP!!!!
06-28-2004, 04:26 PM
#2
you have a factory fuel filter? try a fresh one?
i am surprised you are pushing the stock fuel lines and rails that far.. i would certainly swap over to something high flow...where are you measuring your fuel pressure from?
you have alternator voltage going to both pumps? what is your current edit pe table?
as an aside i have been running both my pumps full time for the last 4 months and have yet to have issue doing that.
i am surprised you are pushing the stock fuel lines and rails that far.. i would certainly swap over to something high flow...where are you measuring your fuel pressure from?
you have alternator voltage going to both pumps? what is your current edit pe table?
as an aside i have been running both my pumps full time for the last 4 months and have yet to have issue doing that.
06-28-2004, 04:43 PM
#3
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Originally Posted by MIGHTYMOUSE
you have a factory fuel filter? try a fresh one?
i am surprised you are pushing the stock fuel lines and rails that far.. i would certainly swap over to something high flow...where are you measuring your fuel pressure from?
you have alternator voltage going to both pumps? what is your current edit pe table?
as an aside i have been running both my pumps full time for the last 4 months and have yet to have issue doing that.
i am surprised you are pushing the stock fuel lines and rails that far.. i would certainly swap over to something high flow...where are you measuring your fuel pressure from?
you have alternator voltage going to both pumps? what is your current edit pe table?
as an aside i have been running both my pumps full time for the last 4 months and have yet to have issue doing that.
Im measuring the Fuel pressure with a Mototron 0-5V sending unit on the
front of the fuel rail.
The Racetronix kit pulls its power right from the + terminal on the battery.
PE/RPM table
1.0136(2400rpm) 0.9690(2800) 0.9661(3200) 0.9302(3600) 0.8983(4000)0.8527(4400) 0.9041(4800) 0.9070(5200) 0.9041(5600) 0.9264(6000) 0.9157(6400) 0.9545(6800)
I have the Speed Inc fuel rails but am using the stock lines for now.
Wouldn't the Injector Duty Cycle go up if I was running out of fuel? Not Down?
06-28-2004, 04:48 PM
#4
your pe table is crazy low. you have a stock maf and stock maf curve?
the 'target' a/f is 14.7 divided by the number in the p.e. table.. example 14.7/1.28= 11.4 afr. now this assumes all the other values that it depends on are correct, cid, injector scale, maf curve and whatever else.
the 'target' a/f is 14.7 divided by the number in the p.e. table.. example 14.7/1.28= 11.4 afr. now this assumes all the other values that it depends on are correct, cid, injector scale, maf curve and whatever else.
06-28-2004, 05:05 PM
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Originally Posted by MIGHTYMOUSE
your pe table is crazy low. you have a stock maf and stock maf curve?
the 'target' a/f is 14.7 divided by the number in the p.e. table.. example 14.7/1.28= 11.4 afr. now this assumes all the other values that it depends on are correct, cid, injector scale, maf curve and whatever else.
the 'target' a/f is 14.7 divided by the number in the p.e. table.. example 14.7/1.28= 11.4 afr. now this assumes all the other values that it depends on are correct, cid, injector scale, maf curve and whatever else.
My LTFT are about -2
It is a stock 1999 screened MAFS. Only thing I did to the MAF table was extend the curve to 511.99@ 11750Hz. The MAF is maxxed by about 5000 rpm in every gear.
That PE/Table gives me a flat 10.6-10.8 AFR curve in 1st-3rd gear and 4th until 5500 rpm. Like I said I tried adding 20% @ 5600 & 6000rpm and worked in every gear but 4th.
I have not messsed with any other tables with LS1edit except timing.
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06-29-2004, 04:05 PM
#11
6.16 is really low for those injectors.. they must not flow near as well as the mototron 60's which i had sent to 7.87, using my same calculations the 57's would like to run around 7.4.. i can understand why this would make you need to pull fuel in p.e. below what it adds for stock.. but it should still give -25 ltrims with that flowrate near idle.
your fuel pressure with the vaccum unhooked at idle is 60 correct?
sent mail.
i am a believer in that if a fuel or timing curve looks good, it will run good. and should mimic your powerband (or it's inverse)your pe table is up and down and all over the place (no offense).. try to keep everything smooth and swoopy.
your fuel pressure with the vaccum unhooked at idle is 60 correct?
sent mail.
i am a believer in that if a fuel or timing curve looks good, it will run good. and should mimic your powerband (or it's inverse)your pe table is up and down and all over the place (no offense).. try to keep everything smooth and swoopy.
Last edited by MIGHTYMOUSE; 06-29-2004 at 04:17 PM.
06-29-2004, 05:58 PM
#12
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Originally Posted by MIGHTYMOUSE
6.16 is really low for those injectors.. they must not flow near as well as the mototron 60's which i had sent to 7.87, using my same calculations the 57's would like to run around 7.4.. i can understand why this would make you need to pull fuel in p.e. below what it adds for stock.. but it should still give -25 ltrims with that flowrate near idle.
your fuel pressure with the vaccum unhooked at idle is 60 correct?
sent mail.
i am a believer in that if a fuel or timing curve looks good, it will run good. and should mimic your powerband (or it's inverse)your pe table is up and down and all over the place (no offense).. try to keep everything smooth and swoopy.
your fuel pressure with the vaccum unhooked at idle is 60 correct?
sent mail.
i am a believer in that if a fuel or timing curve looks good, it will run good. and should mimic your powerband (or it's inverse)your pe table is up and down and all over the place (no offense).. try to keep everything smooth and swoopy.
After I bought the T76 & wideband I turned the base fuel pressure up to 60psi(with the vacuum line un-hooked) and 6.16 was the IFR that gave me an ave LTFT of -2 cruising around town. After I got the LTFT's to -2 using IFR the car was running about 9.0-9.5:1 AFR across the board at 100% Throttle. I reduced the whole PE/table by about 15% to get an approx 11.0:1 AFR and thats where the tune is right now.
I have the alcohol kit(100% methanol) turned all the way up and the Turbo-Smart activates it along with the second fuel pump at 8psi. I verified both relays and pumps are working by using a air compressor attached to the hose going to the Turbosmart unit and both pumps turned on at exactly 8psi. When I went to the track on friday using the alcohol for the 1st time, I thought for sure I would see a dip in the AFR when the alcohol turned on at 8psi but I didnt.
The alcohol was definetly getting injected at the track because the bottle was about a 1/5 gone after every pass.
06-30-2004, 12:12 AM
#13
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Personally, I think with both pumps in-tank and stock lines, you are out of fuel volume in the higher RPM's and more load (3rd gear). Even though you technically have more than adequate fuel pressure. In fact, I think if you were to tune the car without the 1:1 hooked up (i.e. 62psi constant), it would probably be fine even with stock lines.
Just a guess....
Just a guess....
