Non Oem Efi Questions

[70bird]

Well, after reading the responses in my earlier post, I thought I better post a new set of questions that arose from that discussion, so as not to bury my new Q’s in old thread. Here: https://www.pro-touring.com/forum/sh...ad.php?t=38321 Thanks for taking me to school, so to speak!

Now, a little more educated, I’m looking for answers pertaining to AFTERMARKET fuel systems ie: plumbing, and component locations.
Here’s my current set -up:
A-1000 in the tank
#8 line to F/wall mounted regulator Aeromotive #13101 adj. 30-70 psi
# 6 return line from reg. back to tank
#8 from reg. to Y block
#8 from Y block to EACH fuel rail and “deadheads” (will be looping)
1999 LS1 stock injectors and cam
1998 factory ECM (required with Painless (full?) wiring harness.

Here are my questions:
1- Where in the plumbing, should a fuel damper be located? (I suspect close to rails) Alternative locations?



2-What fuel pressure should I start at? (in 99 GM changed to smaller injectors to 26.3 lbs/hr. from 28.5 lbs/hr. in earlier LS1’s, while increasing pulse width times to compensate for the smaller injectors) So, I have the ECM(98) giving shorter pulse times, AND smaller injectors (99) My head hurts now!

3- Should I use a pump controller?

Thanks in advance for any ideas or advice!
Mark

[andrewb70]

1. NOt sure where you would mount the damper since you are using an aftermarket fuel rail. I think you can safely go without.

2. 58 psi

3. I don't see why you would have to unless the A-1000 is pumping so much fuel through the system that its heating the fuel. Which can happen. I did not read all of the last thread. Unless you are going to use some kind of forced induction, the A1000 is overkill. A walbro, bosch, or Denso Supra pump will provide plenty of fuel.

Andrew

[70bird]

Andrew, thanks for the help!

Yeah, the A1000 is overkill.............for now!

[68Formula]

1. If you mount your adjustable regulator to the front of the fuel rail (or vary close), it will partially act as a damper.

2. 68psi. New pressure = old pressure * (old flow/new flow)^2. Factory was 58psi.

3. Shouldn't be required unless your boosted with that pump.

[andrewb70]

2. 68psi. New pressure = old pressure * (old flow/new flow)^2. Factory was 58psi.

While all that might be true, what he needs to do is get it tuned and not monkey with the factory pressure settings.

Andrew

[68Formula]

While all that might be true, what he needs to do is get it tuned and not monkey with the factory pressure settings.

Andrew

Yes, but if the injectors don't flow enough he could lean out under WOT. 68 psi should still work with those injectors.

[70bird]

Yes, but if the injectors don't flow enough he could lean out under WOT. 68 psi should still work with those injectors.

This is what concerns me. I'm planning for a bigger cam, intake and head mods in the future, but for now I just want to make sure this thing is ok to run at WOT without going lean. (I REALLY need a wideband O2 or EGA) I don't want to spend money on tuning or dyno time just yet,(saving for paint) so I'll take it easy on her for now.

The engine runs well . At 60 psi. vac. regulated to 47psi @ idle, but it does "smell fat" (dating myself LOL) at cold start up. Seems to clean up at hot idle (no EGR?) runs well going down the road, and pulls strong @ WOT.

Any additional thoughts on this? Should I just look for a compromise between 58 and 68 psi? Am I just OCD'ing on this too much?

Thanks, Mark

[andrewb70]

.....At 60 psi. vac. regulated to 47psi @ idle.....

Can you elaborate on this some more? Are you saying that your fuel pressure regulator is hooked to a vacuum sourse?

Andrew

[70bird]

Can you elaborate on this some more? Are you saying that your fuel pressure regulator is hooked to a vacuum sourse?

Andrew

Yes, vac. regulated, as well as adjustable. (30-70 psi) F/wall mounted, and readings were taken at regulator.

[andrewb70]

Yes, vac. regulated, as well as adjustable. (30-70 psi) F/wall mounted, and readings were taken at regulator.

Stock LS1 EFI systems do not have a vacuum referenced FPR. I would disconnect the line. At the very least spend the money on a mail order tune and stop being ocd about it...LOL

Better yet, save some money and buy EFI Live or HP Tuners. Learn how to tune and save yourself a bunch of money in the long run.

Andrew

[70bird]

Stock LS1 EFI systems do not have a vacuum referenced FPR. I would disconnect the line. At the very least spend the money on a mail order tune and stop being ocd about it...LOL

Better yet, save some money and buy EFI Live or HP Tuners. Learn how to tune and save yourself a bunch of money in the long run.

Andrew

I'm calling my therapist first thing in the morning!!!!!!!!!!!!!!!!

Thanks for the help, Mark

[andrewb70]

I'm calling my therapist first thing in the morning!!!!!!!!!!!!!!!!

Thanks for the help, Mark

Good luck with the project Mark.

Andrew