5.3 turbo/timing questions
Thread Starter
Staging Lane
Joined: Jul 2007
Posts: 71
Likes: 19
5.3 turbo/timing questions So got some runs in on Monday. Sn95/lc9/vs80/96 t4/th400/3.55 etc. Car is about 3300 lb race weight. Ended up going a best of 9.3@149 on pump e85, 1.47 60'. 21psi. The trap speed/et didn't change adding boost. I went up to 23.5 and no change. Worst IAT on any run was 134. I tried shifting 6700-7100 and no measurable change. My timing was 14*.
1. Based.on your experience, am I out of turbo? Was hoping to see more gains with the increased boost. It's a billet wheel vsr 80/96 1.25 t4. Tr1245 ic, 2.25 hotside coming from gen 2 cts-v manis.
2. Is my timing likely too low? People are all over the place from what I can see. It's 10.3 to 1, 243 heads, btr stage 2 cam, pump e85. Plugs look ok, I'm no expert but don't see anything weird on them.
Looking for thoughts/experience on the matter, thanks.
1. Based.on your experience, am I out of turbo? Was hoping to see more gains with the increased boost. It's a billet wheel vsr 80/96 1.25 t4. Tr1245 ic, 2.25 hotside coming from gen 2 cts-v manis.
2. Is my timing likely too low? People are all over the place from what I can see. It's 10.3 to 1, 243 heads, btr stage 2 cam, pump e85. Plugs look ok, I'm no expert but don't see anything weird on them.
Looking for thoughts/experience on the matter, thanks.
Speed’s fast for the E.T. How much boost and rpm were you leaving on? Knock the 60’ down and it’ll pick up (obviously). It runs out the back, needs to sixty foot about a tenth better. That’ll get you 9.1-9.0s.
Thread Starter
Staging Lane
Joined: Jul 2007
Posts: 71
Likes: 19
3100rpm and 5 psi. I just got the trans brake in it so I'm still figuring that all out. Even without a brake going 10.1, the trap was still the same. I understand I've got some work to do on the launch but it should have picked up trap with the increased boost.
FYI, 6.0@120 1/8
FYI, 6.0@120 1/8
The trap shows horsepower. Try leaving at more boost and/or rpm. 3100 and 5 psi are really low. RPMs at the launch make a more subtle change where more boost is typically more drastic of a change. 120 in the 1/8 should be 5.70s.
How do the plugs look?
How do the plugs look?
Last edited by 3 window; Sep 7, 2021 at 08:38 PM.
Thread Starter
Staging Lane
Joined: Jul 2007
Posts: 71
Likes: 19
I understand all that. It's still primarily a street car. Poly bushings, single adjustable stuff, no anti roll bar, small tire, tighter converter, etc. I'm not asking how to launch better, I'm asking about my turbo and ignition timing.
Teching In
Joined: Jul 2015
Posts: 36
Likes: 4
Your timing was at 14* @ 21psi? that seems considerably low for e85. I can't tell you what timing your motor wants, be sure you have verified your timing before taking anyones advice. For example, at 32psi my L33 is right around 14-15* in the high rpms and the spark plug strap shows it on the top side of the bend. So I would say yes, timing is low. Do all of the proper steps to raise it safely, verify it, and watch your plugs....all of them.
Your timing was at 14* @ 21psi? that seems considerably low for e85. I can't tell you what timing your motor wants, be sure you have verified your timing before taking anyones advice. For example, at 32psi my L33 is right around 14-15* in the high rpms and the spark plug strap shows it on the top side of the bend. So I would say yes, timing is low. Do all of the proper steps to raise it safely, verify it, and watch your plugs....all of them.
yes this. And make sure to verify the timing, there's lots of videos out showing that.
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Well to add to 3 Window's comments, the MPH will go up if you 60 stronger.
If you are SBE, 14 timing on E85 might be the ticket. People would tell you to make a rip and pull some plugs to look at timing mark on the strap. Steve Morris has a good YT video on this.
If you are SBE, 14 timing on E85 might be the ticket. People would tell you to make a rip and pull some plugs to look at timing mark on the strap. Steve Morris has a good YT video on this.
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Nice to see someone actually racing!
I finally attempted my local track after a 3 year absence because the track just sucks! I’ve been driving an hour south where they actually prep.
Anyway, my track got a real track sprayer. Although they didnt use it in the night I went. Was still ok traction wise.
L33 at 18 psi in low and 22 psi 2nd and 3rd.
I am E85, timing at 17. Verified with a timing light.
9.01@152. 3450 approx race weight.
Try a couple degrees and report back.
Ron
I finally attempted my local track after a 3 year absence because the track just sucks! I’ve been driving an hour south where they actually prep.
Anyway, my track got a real track sprayer. Although they didnt use it in the night I went. Was still ok traction wise.
L33 at 18 psi in low and 22 psi 2nd and 3rd.
I am E85, timing at 17. Verified with a timing light.
9.01@152. 3450 approx race weight.
Try a couple degrees and report back.
Ron
Thread Starter
Staging Lane
Joined: Jul 2007
Posts: 71
Likes: 19
Nice to see someone actually racing!
I finally attempted my local track after a 3 year absence because the track just sucks! I’ve been driving an hour south where they actually prep.
Anyway, my track got a real track sprayer. Although they didnt use it in the night I went. Was still ok traction wise.
L33 at 18 psi in low and 22 psi 2nd and 3rd.
I am E85, timing at 17. Verified with a timing light.
9.01@152. 3450 approx race weight.
Try a couple degrees and report back.
Ron
I finally attempted my local track after a 3 year absence because the track just sucks! I’ve been driving an hour south where they actually prep.
Anyway, my track got a real track sprayer. Although they didnt use it in the night I went. Was still ok traction wise.
L33 at 18 psi in low and 22 psi 2nd and 3rd.
I am E85, timing at 17. Verified with a timing light.
9.01@152. 3450 approx race weight.
Try a couple degrees and report back.
Ron
@RonSSNova , I have a friend with S483, forged 370, 3200 r/w, T400, 3.25, C16 just ran 9.22@147 on 14-15 lbs, he's try to run as little boost as possible and go 8.99 lol. Then will start to turn it up. He's been reading plugs, he's slightly conservative on timing vs. what was reccomended but the mark is by the bend.