Safe timing for pump gas
Safe timing for pump gas I have tried searching with very little luck so I am asking the experts. I Recently built a 5.3 with ls6 cam with a 78mm turbo in a 1985 foxbody mustang. I am running a th3500 with 3800 stall and trans brake. I am running on 9 psi. What kind of timing should I be running with 91 octane fuel. I have been running around lately on 14 degrees with good luck. Am I pushing my luck or is 9 psi with 14 degrees timing alright for pump gas. Also If I decide to run 105 octane race gas what timing would you guys recommend.
I am going back to the track friday to try the new gears. I recently had 3.73 gears and ran a 11.48 @ 122 mph but I could not get full boost in first and I had major traction problems. So I am hoping for some low 11's to high 10s with the new 2.73 gears and traction. Thanks, Jared
I am going back to the track friday to try the new gears. I recently had 3.73 gears and ran a 11.48 @ 122 mph but I could not get full boost in first and I had major traction problems. So I am hoping for some low 11's to high 10s with the new 2.73 gears and traction. Thanks, Jared
Look at denmah's JY builds. He's got the hand of moderate boost pump gas LS motors similar to yours. 10-12* 12-17psi with a very basic water/meth injection kit seems to be the sweet spot on most of his builds.
Probably 6 or 8 build threads floating around here... Here is an example.
https://ls1tech.com/forums/forced-in...68-145mph.html
Probably 6 or 8 build threads floating around here... Here is an example.
https://ls1tech.com/forums/forced-in...68-145mph.html
Ya. I would do race gas but I drive this on the street alot for fun And that gets expensive. And we dont have e85 available here. As the weather has cooled to 60-70s I have been running 14 degrees timing. I Hope that should be safe for winter and as it gets back to the 90-100 degree temps I will back it down to 12 or so.
make a pass then back it off to 12*and see if it runs the same. or if the mph picks up just see what it likes within reason. mine is 10# boost and 11* timing on pump 93 only.mine runs mid 10s at 130 that way. but its a 6.0 w/3.23 gear.
I run 17 degrees at 9lbs with my L33 on 91 pump gas. Been doing this for 3 years now. I have it pull timing if the intake or water temps get too high. I could probably add more timing after peak torque but it's just a street tune. I don't suggest you start that high, but you could end up there. Watch mph at the track. When it stops picking up pull a degree out and you should be good.
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On The Tree
Joined: Sep 2006
Posts: 104
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From: Greensboro NC
I ran mine a lot at the track with 14psi and 15 degrees timing on just 93. Now im at 17-18lbs and 15 with about 1/3 110 in tank. Plugs look good and actually could use more timing. It has picked up mph every time I turn it up. I kept waiting on it to slow down but it never did so I just left it at 15 for now.
