Fuel Pressure drops to 25 psi
#3
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1. The video was at the 1/8 track.
2. No
I started noticing it after I changed my tune. I orginally scaled my injectors. Now I have the correct numbers in my IFR table. I also descreened my MAF as a test. (Screen is going back in)
I went to the track to tune my PE. And couldn't get my AFR down below 13.xx above 5600 rpms.
I actually thought my wideband was wrong because I didn't get any KR.
And just 2 weeks ago on my old tune. My AFR was 11:1 at the dyno. :dunno:
2. No
I started noticing it after I changed my tune. I orginally scaled my injectors. Now I have the correct numbers in my IFR table. I also descreened my MAF as a test. (Screen is going back in)
I went to the track to tune my PE. And couldn't get my AFR down below 13.xx above 5600 rpms.
I actually thought my wideband was wrong because I didn't get any KR.
And just 2 weeks ago on my old tune. My AFR was 11:1 at the dyno. :dunno:
#4
Your fuel pump is probably going bad if you were not loosing pressure before...How long abo did you install it? A while back there were problems with failing pumps from racetronix. They have now fixed the problem.. I would not do any more WOT runs untill you have fixed it...
#6
Yep...
Originally Posted by chriswtx
Your fuel pump is probably going bad if you were not loosing pressure before...How long abo did you install it? A while back there were problems with failing pumps from racetronix. They have now fixed the problem.. I would not do any more WOT runs untill you have fixed it...
I've seen that happen on several turbo BUICKS..the hose that connects the pump nipple to the hanger tube leaks.
I've also seen the install go bad when the OEM noise attenuator is re-used to connect the pump/hanger tube, instead of using the hose and clamps...
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#8
Joined: Mar 2002
Posts: 2,029
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From: A Racetronix dealer near you...
Originally Posted by Ed Blown Vert
Besides changing out the fuel filter. What else could cause this?
Currently using the Racetronix setup with their wiring kit.
Gauge
Currently using the Racetronix setup with their wiring kit.
Gauge
Some pressure drop is normal when supporting high HP numbers if you are not using a FM FPR system. You may also be beyond the HP support range of this system.
If you suspect your are having problems please contact your authorized Racetronix dealer for technical support.
You will get faster accurate info on diagnosing your problem and be on the road to a solution much quicker this way.
Thank you
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Last edited by Racetronix; 02-04-2006 at 10:19 PM.
#10
Joined: Mar 2002
Posts: 2,029
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From: A Racetronix dealer near you...
Originally Posted by chriswtx
Your fuel pump is probably going bad if you were not loosing pressure before...How long abo did you install it? A while back there were problems with failing pumps from racetronix. They have now fixed the problem.. I would not do any more WOT runs untill you have fixed it...
There was no problem to fix and this information is nothing but rumor spread by a small handful of misguided people.
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#11
New motor and now this, along with the bad plenum and low boost, looks like you got that taken care of, you got to be bumming now.
Watched the video
Its even low at idle, mine sits around 60 and and with WOT might drop to 53-55. I would defiantly try a new filter. Just curious when you last replaced it did you drop the tank or do the "Hatch" method. If thats not it I would say time for a new pump, or maybe you will get lucky and find a leak which might count for the low pressure at idle.
Watched the video
Its even low at idle, mine sits around 60 and and with WOT might drop to 53-55. I would defiantly try a new filter. Just curious when you last replaced it did you drop the tank or do the "Hatch" method. If thats not it I would say time for a new pump, or maybe you will get lucky and find a leak which might count for the low pressure at idle.
#14
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From: Sunny San Diego
Originally Posted by Racetronix
Some pressure drop is normal when supporting high HP numbers if you are not using a FM FPR system. You may also be beyond the HP support range of this system.
If you suspect your are having problems please contact your authorized Racetronix dealer for technical support.
You will get faster accurate info on diagnosing your problem and be on the road to a solution much quicker this way.
Thank you
If you suspect your are having problems please contact your authorized Racetronix dealer for technical support.
You will get faster accurate info on diagnosing your problem and be on the road to a solution much quicker this way.
Thank you
If it is the pump, do you sell just it??
#15
Your making too much HP for that single pump.It's a very common problem.We run out of fuel volume at about 550-580rwhp on M6 cars ussing there pump and might get 600rwhp with a BAP. Time to rethink your fuel sytem.
#16
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From: Sunny San Diego
Originally Posted by 618HAWK
New motor and now this, along with the bad plenum and low boost, looks like you got that taken care of, you got to be bumming now.
Watched the video
Its even low at idle, mine sits around 60 and and with WOT might drop to 53-55. I would defiantly try a new filter. Just curious when you last replaced it did you drop the tank or do the "Hatch" method. If thats not it I would say time for a new pump, or maybe you will get lucky and find a leak which might count for the low pressure at idle.
Watched the video
Its even low at idle, mine sits around 60 and and with WOT might drop to 53-55. I would defiantly try a new filter. Just curious when you last replaced it did you drop the tank or do the "Hatch" method. If thats not it I would say time for a new pump, or maybe you will get lucky and find a leak which might count for the low pressure at idle.
I dropped the tank. Guess I will be dropping it again.
#17
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From: Sunny San Diego
Originally Posted by Slowhawk
Your making too much HP for that single pump.It's a very common problem.We run out of fuel volume at about 550-580rwhp on M6 cars ussing there pump and might get 600rwhp with a BAP. Time to rethink your fuel sytem.
That vid was a boost only run.
#18
Originally Posted by Ed Blown Vert
I didn't think 526 rwhp would be too much for the pump.
That vid was a boost only run.
That vid was a boost only run.
#20
Joined: Mar 2002
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From: A Racetronix dealer near you...
Originally Posted by Ed Blown Vert
Changed the filter. No change, has to be the pump. Still no answer from Thunder or Racetronix.
Perhaps you should try again! Call Thunder directly if e-mail is not working out for you.
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Please support a Racetronix dealer near you for personalized service.
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Please support a Racetronix dealer near you for personalized service.
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