zapp168

iTrader: (7)

Having trouble at the track, The car runs fine around town and pulls nice and hard to 6000 RPM, never a problem.
At the track, WOT it just stops pulling. My specs are in sig. Is this a symptom of inadequate fuel supply? I have yet to dyno the car so I am unsure of the horsepower, but I know I have to at least have it running to get it on the dyno. What is the easiest fuel preasure gauge I can hook up to monitor Fuel preasure? The fuel system is stock except for the pump, injectors, and hot wire kit, is there an immediate fuel system issue at this HP that I should address?..
Thanks

zapp168

iTrader: (7)

19 seconds at 70MPH....Ya fixing this is important!

fenix999

iTrader: (17)

Maybe belt slipping problems causing less boost or no boost at all?? Anyways yea fuel pressure gauge will be your best bet to see if its fuel related. Fuel pressure should be AT LEAST 57psi and more when combined using a fuel pressure regulator. Weird that it runs fine on the street tho and not at the track. I'd say its those two ideas first....after that i have no idea
Good luck either way tho!

zapp168

iTrader: (7)

I have had the belt slip before, and the car was still fast, just not as fast. I mean this is so bad, when you step on the pedal it feels like someone shut off the engine,the RPM's drop, If I coast for a bit with my foot out of it, it comes back. When I drive home, the car has been fine thus far, I actually wish the problem would get worse so I don't keep driving to the track to try to diagnose.

jmdgto

get a fuel pressure gauge. monitor it. if you run lean you will be buying a new engine. happened to me. you have never had it tuned? go to a shop and have them check it.

zapp168

iTrader: (7)

I ordered the gauge. I tune the car myself. I just asked if this sounds like a maxed out fuel system. I guess I am the only person to ever have this happen to them????? I mean on the street the car will break the tires loose at 60 MPH and kick out sideways. I figured 600-650 HP, now I am reading on other posts that my fuel system is probably not enough for what I have. The wideband was at 13ish to 1 but the car was at 4000-4500 and not pulling, so for WOT I was lean, but for 4500 and gagging I don't think 13:1 is horrible. Well I will keep digging

dcvingv6

iTrader: (3)

Hey man, if its any indication, i have a fairly similar setup to you, i am just under 600hp, and my single hotwired racetronix pump is turning out to be not enough... my pressure is ok till about 5800, then from there it drops fairly quickly. I get out of it before i do any damage. I am going with a dual walbro setup, and well see what happens.

Good luck, hope you get it figured out!!!

--Mike

zapp168

iTrader: (7)

THANK YOU MIKE!!!!!!

dcvingv6

iTrader: (3)

No problem!!

I was figuring i was going to be OK with the single pump on my current setup.

It's scary when your racing, and the car falls flat on its face, and the fuel pressure is down near 40psi, and your on the stock bottom end. Wideband wasen't logging correctly, so i am not sure how lean i got, i noticed 12.7 as i got out of it.

I knew i was going to have to go with a dual setup (atleast) when the new forged 370 goes in, i guess i get to get that done and worked out now...

Welcome to the world of FI on LSx motors i guess!!!

Also not sure if you have seen it before, but there is a sticky at the top of this section showing how to do a twin walbro setup for fairly cheap. I have it all set ready to go, just waiting on the pumps to show up.

--Mike

zapp168

iTrader: (7)

Ya I noticed that sticky tonight.......more reading...more work, let me know how it works out for ya

jmdgto

i have had the same problem. i am at 650 rwhp with a bosch 044 pump. you need to change your fuel systems .srry if i was not clear.

zapp168

iTrader: (7)

Thanks man....just did not want to poke around in the dark