Over 100psi at the rail
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Over 100psi at the rail Ok, I've been playing with my tuning since I have Racetronix 38lb/hr injectors. No matter what values I placed in the IFR table, it came out fat. Finally had a chance to put a gauge on the rail tonight and pegged it. Showing well over 100psi at key on, and running. Here's a quick run down of my fuel system, where did I go wrong.
1999 Camaro orignally a V6
Stock V6 fuel tank
Stock V6 fuel lines
LS1 fuel bucket
Walbro GSS-341 Pump
Stock LS1 fuel rails
Racetronix 38lb/hr injectors
I thought the LS1's were regulated at the bucket? If not, where do I need to regulate? I'm under the impression that I can't use the Vette filter/regulator assembly, since my system is returnless.
1999 Camaro orignally a V6
Stock V6 fuel tank
Stock V6 fuel lines
LS1 fuel bucket
Walbro GSS-341 Pump
Stock LS1 fuel rails
Racetronix 38lb/hr injectors
I thought the LS1's were regulated at the bucket? If not, where do I need to regulate? I'm under the impression that I can't use the Vette filter/regulator assembly, since my system is returnless.
it sounds like you dont have the regulator working at all. the feed comes out of the tank, goes through the filter, and then t's off back to the return. there was a very useful thread on thirdgen.org about it, but i cant find it now. another option would be to run a c5 vette fuel filter, the regulator is in the filter and it has three ports, in, out, and return
You can install a returnless regulator, it will work just fine. You can go either way tho
- Fuel regulator
- Fittings
- Fuel hose
- Hose clamps
- Teflon paste or loctite thread sealant (Some regulators have O-ring fittings, so they don't need any sealant)
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Verdad Gallardo
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Get the Vette regulator and put it on the ends of your V6 lines under the hood. Then just run a single line from the output of the regulator up to the fuel rail.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Thread Starter
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From: Chicago IL/ Lake Geneva WI
Joined: Nov 2001
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From: Anderson, Indiana
If your V6 lines will reach to the middle of the fuel rail, just plug the output of the regulator directly on to the rail, and then hook your V6 feed and return lines to the feed and return ports.
Instant filtered and regulated 58 psi.
Instant filtered and regulated 58 psi.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
You said you had a return line still on the car from the V6.
Where's it go??
Your plan won't work too well if the return line just spews out under the car somewhere!
Where's it go??
Your plan won't work too well if the return line just spews out under the car somewhere!
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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From: Chicago IL/ Lake Geneva WI
The hard line is still there. It still goes back to the fuel tank. I should have worded that better. My concern was that the V8 bucket doesn't have the right provision to flow fuel back inside. Looks like I just need to remove the regulator though. If someone had a diagram of the top of a fuel bucket, it would be really helpful.
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Ok, got it plumbed in tonight. Had to "persuade" the fuel rail inlet a little bit because the regulator wouldn't fit over the coil packs. Had good pressure at 'key on' priming, but went to 85psi at cold idle. I couldn't run the car very long, because it's late, I have bitchy neighbors and open headers. Where ya at Speartech?
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Yep. Bad regulator, plugged return line, or possibly if you are using a vapor line instead of an actual fuel return line, these usually have an orifice restricter in the line somewhere and will not work as a return line without modification.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Thread Starter
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From: Chicago IL/ Lake Geneva WI
That was my first thought when I saw this, my friends that were 'helping' me said there was no way there could be a restriction down the line causing this. Really, thanks for all your help here!