Just wanted to pop in and say hello again to everyone. My car has been back up and running for about 3 or 4 weeks now thanks to R/T tuning. I just finished getting my "break in" mileage and I'm waiting for my CJM kit to arrive before I can go back for a retune and see what numbers it puts down..car still has the basic BP kit, but now with a built motor. Eagle H-beam rods, wiesco 9:1 Pistons, and ARP L-19 head studs. Can't wait to see what happens!!

congrats bro !

Thank you jay!

Ditto. Keep us posted

When I finally get my retune, I'm probably going to be pushing the limit of the basic kit. I'll probably max the injectors out first but we will see what happens. Give some numbers of how well this lot performs. Previous numbers were 554whp 491wtq at 12lbs.

You are definitely going to need 1000cc injectors.

I completely agree. Although Im going to give Vince a call to see what kind of duty cycle my current ones are at. If it's not too bad may just run them out. Who knows, a lot has been going on and a lot of money been going out the past few months. Haha

I'm upgrading to 1000cc, going to E85 and ecutek in the fall.

:eek:oh my lawd. Lol I wanna stay on 93. And maybe a 110 or c16 tune but that's a maybe. I don't want to strickly stay on e85 so that got ruled out for me. Definitely need to share your numbers lol

So I had Seb/Greg - load a Ecutek tune yesterday. And the first thing he noticed was my idle fuel pressure is 72 psi. And this might be causing an issue with the cranking tables. As hot start issue is still there, uggg.

But during a few of the base runs - they also noticed my fuel pressure at wot drops to 62 for a couple secs then it drops to around the 40 psi range. :confused:

8 psi got me to 478 hp/torque of 394 then did a 10 psi pull and it got me to 525 hp but it was lean - and unsafe - so they got me to back it down to 8 psi of boost. And that's where it stays until I find the issue with the fueling.

Seb/Greg recommended a fuel return system. So I know Jmac88 here does not run a return system, and he has no problems running with pressure loss.

And Mitco here does have a return system, and has had a couple fueling issues.

So how many of you guys have return systems? Do you guys think maybe I have a bad fuel pump?

It should be around 42 with the stock system at wot. I did notice that my pressures do fluctuate on a cold start with my return system though.

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I do not run one. My fuel pressure stay pretty rock solid expect at idle when it runs high.

You can fix the high idle pressure by doing the Venturi diameter drill out procedure in Phunks ultimate fuel pump thread.

58PSI at 0 psi of boost, and ~70ish at boost :D. My stock system was droppign into the 36-40 range stock. Now even with my Areomotive 340 my fuel pressure sits at an even 52-53PSI (I hooked it up to a 1:1 with a vac/boost source).

I drilled out my venturi as well.

I was very close to building my bottom end till I started to realize the only way I would really get to use it is if I was running race fuel or E85. I am pushing our 94 octane about as far as Ill ever get it, I mean you could lower the compression but I love the responsiveness of the engine out of boost and I wouldn't want to lose that. This kit now has 25,000miles on it and is still going strong.

Stock pressure is 52. It sounds like your fuel pump module was not properly modified to accommodate the larger fuel pump you have, and its causing a low load pressure spike. The regulator is unable to do its job during low fuel consumption. As fuel consumption increases pressure will come back down to the proper setting. Then it should hold there around 52 until you are maxing out fuel system and then pressure starts to drop again.

Do the idle pressure fix and that will solve your spikes. The return system will solve the drop on the top end.

A VVEL engine should really have the regulator hooked up to only a boost source, with no vacuum, before the throttle bodies. Its not the end of the world, but your closed loop cycle will be really struggling to keep A/Fs in check during steady load cruising.