Base fuel PSI

92 Ty 1173

92 Ty 1173

Active member
Ok, I have a .030 block, L-35's 2.02/1.6 p-n-p, 20G, 3 Bar, stock injectors. What is the recommended base fuel pressure? I have it at 52 now. I know stock injectors aren't the best choice, i ran out of $$. In spring I'm getting bigger ones.
 
neildemo

neildemo

Administrator
Re: Base fuel PSI

Hopefully Dave P. Jumps in But I beleive he said at idle 42 is good.
your a little high what kind of boost u running? if your running a 3bar and 17psi keep it there.
just my two cents
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Base fuel PSI

42 psi at idle with the hose disconnected from the MAP sensor.

Do not run more boost than your AFRs can handle. The L35s will flow more air and at 17 psi I expect you'd be lean. 11.5-12.0 at 17 psi is healthy. Below that = KABOOM.

Was the 55psi to compensate for smaller injectors? If so, your pump may be struggling. Have you got a Walbro 255 in there? (watch out for fakes that sound like drills)

Don't get 50s if you can avoid it - get the SIEMENS 65#ers.
 
92 Ty 1173

92 Ty 1173

Active member
Re: Base fuel PSI

Yeah i have a 255 and an afpr. I will crank it back after I get Hood's chip in. Thanks.
 
B

bonesdmz

In Mother Russia Typhoon drives You!
Re: Base fuel PSI

midnightbluS10 said:
Arent you suppose to plug the hose also?
Click to expand...
It doesn't matter IMO, there will still be normal atmospheric pressure if you plug it or not. And that's the baseline.

**
Yeah, right :) ^^ this goes to FPR connector, not the hose :)
 
sytyguy

sytyguy

Moderated User
Re: Base fuel PSI

Truck at idle, vac line removed from FPR and plugged (thumb or bolt or whatever), set base psi to 45 for that chip. If lean at WOT and you see the integrator (and BLM over longer period of time) constantly above 128 (significantly above like 140, 150, 160.....not 129 or 130) then increase base by 2 psi until you get the results you're after. Every truck is different and I've had people run that same tune (20G, 3bar, L35s, stock otherwise) and require 52 psi base and some require 42 psi base. Just adjust for what works for your truck.
 
92 Ty 1173

92 Ty 1173

Active member
Re: Base fuel PSI

Thanks Mike. I set it at 45 on saturday when I put it in. I gotta get a laptop to log it cause it still has alittle stutter in it. When I had the ultimate in it I had a fairly regular knock lite, even when just cruising, no boost. I think my converter is alittle noisy and it might be picking that up. I may have to back the sensor off, might have torqued it too much. Thanks again, I'm glad to be driving it, it's only been 4 years. LOL
 
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