effects if high fuel pressure?
effects if high fuel pressure? Car 98 H/C vette TR 230 cam on a 112lsa
I'm just curious what side effects would be caused by high fuel pressure? The guy bought the car used and it already had mods. I checked the fuel pressure on the rail and at idle it was 68 psi. I think the previous owner did that to keep from replacing the injectors?? That's the only reason I can think of. The drawback is the car is rich at idle and low rpm cruising. I'm just making sure that my theory is correct.
I'm just curious what side effects would be caused by high fuel pressure? The guy bought the car used and it already had mods. I checked the fuel pressure on the rail and at idle it was 68 psi. I think the previous owner did that to keep from replacing the injectors?? That's the only reason I can think of. The drawback is the car is rich at idle and low rpm cruising. I'm just making sure that my theory is correct.
That's pretty much it... At a higher rail pressure, your injectors are flowing more than they are expected to by the PCM's calculation. Thus, the window that the injectors are open for are allowing more fuel then needed and causing your richness and surging. The fix:
IFRs
IFRs
Thanks for the replies. I think the first thing I'm going to do is put his fuel pressure back to 58psi and see where his injectors are at and maybe have him buy new injectors. I already know he's going to need some. I figured his injector duty cycle and even with the high pressure he was right on the fringe at 80%. Lower that fuel pressure by 10 psi and those injectors are no longer cutting the mustard. Since it's a 98 he has the 28 lb/hr injectors. How much difference would there be between those and 30 lb/hr? I know 2 lb/hr 
but I mean as far as his duty cycle. Will 2 lb/hr be enough?
but I mean as far as his duty cycle. Will 2 lb/hr be enough?
Originally Posted by 0rion
Thanks for the replies. I think the first thing I'm going to do is put his fuel pressure back to 58psi and see where his injectors are at and maybe have him buy new injectors. I already know he's going to need some. I figured his injector duty cycle and even with the high pressure he was right on the fringe at 80%. Lower that fuel pressure by 10 psi and those injectors are no longer cutting the mustard. Since it's a 98 he has the 28 lb/hr injectors. How much difference would there be between those and 30 lb/hr? I know 2 lb/hr but I mean as far as his duty cycle. Will 2 lb/hr be enough?
but I mean as far as his duty cycle. Will 2 lb/hr be enough?
Originally Posted by 0rion
Thanks for the info. So I shouldn't mess with taking everything back to stock and starting over? Just figure the IFR table at the low RPM's and be done with it?
Trending Topics
I had the same problem with my car after I added my fuel pumps. I have scaled my IFR table by 3% and found out that after I got my VE table dialed in and smooth, the psi went back to a solid 62-64 psi. This is with a inline and intank 225lph pump on stock 28lb inj. I have since fixed the rich idle, smell, and other problems.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
