Problem with Scheid Lasercuts!!! Will not idle!!!

I checked my fuel pressure last night and i had about 40-45 at idle and at WOT down the road i was getting close to 15-20! Does this sound correct or was the gauge a total piece??

Lance
 
Sounds about right to the level of HP you have. I think the limit you want to see is 18psi WOT. Just to let you know, I went with a FASS 180gpm@45psi when my fuel pump was on the way out and I am loving it. At WOT run to around 3800 RPM I can make it drop to about 43psi from 45. It is rock solid. Just for comparison, I have 503 HP so I should be flowing real close to the same amount of fuel as you.
 
If 18PSI is the safe limit for WOT it sounds like I was way below it as I could get the stock LP down to 7-9 PSI at WOT...
 
yeah, you are below it. The more pressure the better with the p7100. To a limit of course. However, the limit is well above 7-9psi. I could draw my pressure to 5-6psi before I changed mine. It still ran well, but you could tell it was running out of fuel on the upper RPM's.
 
acc1079 said:
yeah, you are below it. The more pressure the better with the p7100. To a limit of course. However, the limit is well above 7-9psi. I could draw my pressure to 5-6psi before I changed mine. It still ran well, but you could tell it was running out of fuel on the upper RPM's.
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Judging by my smoke quality in while sled pulling at those RPM's you couldn't tell it was low of fuel though.. It was probably a factor in some of the issues I had last year.

This year that will be all taken care of.
 
acc1079 said:
Sounds about right to the level of HP you have. I think the limit you want to see is 18psi WOT. Just to let you know, I went with a FASS 180gpm@45psi when my fuel pump was on the way out and I am loving it. At WOT run to around 3800 RPM I can make it drop to about 43psi from 45. It is rock solid. Just for comparison, I have 503 HP so I should be flowing real close to the same amount of fuel as you.
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oldsmokey:

I am running the exact same set-up as "acc1079" and am very happy with it.
I have me pressures set somewhat higher, 60lbs. at idle and it never gets below 57-58lbs at WOT. This is at about 3800-4000 RPM like "acc1079."

I may need to turn it down some as my Isolator on my "DiPricol F.P. Gauge" leaks occassionally and I feel it is probably due to the high pressure.

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John_P
 
but how low can i get before i start losing power on the upper rpms??? 10-15?? or what?

lance
 
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