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What's the more knowledgeable people think about this timing table in boost? I'm on e85 and I'll give a complete rundown of my set up below. I'm not new to boosted LS's but I am new to "leaning" on timing, although this still isn't as aggressive as others. I know every engine is different on what it likes, this is just a starting point. I'll take data logs and read plugs, but for a starting point how is this? I ran about 6° less than this when tuning my fuel tables. Now that the fuel is complete, I need to put some timing in it. I'm not a professional, I tune my own stuff just for fun as a hobby. My last engine was a gen 3 5.3 that made 800whp and went 10.30's in a 4500lbs truck. Is this too aggressive? Should I knock a few degrees out for now? I do however need to pull a couple degrees in peak torque.
Current set up:
LQ4, gen 4 rods and flat top pistons (with these heads it's basically an iron LS2)
Ported 799 heads and LS9 head gaskets, head studs. 10.9:1 compression
on E85 with enough fuel for about 1600whp (WAY more than I'll need)
TBSS intake/LS3 throttle body
VS racing 80/96 t6 1.32ar on 18psi for now, 4" intercooler
LSXceleration "stage 2" (as they call it) turbo cam 226/230 .625"/.625" 114+4
Holley Terminator X max ecu
Last edited by Y2K_Camaro; Mar 13, 2026 at 06:47 AM.
That timing table tells me I've been a wuss with my setup, lol. It looks pretty reasonable, but I'm new at tuning as well so don't take my word as gospel. I've only been running about 15 degrees at 18PSI.
That timing table tells me I've been a wuss with my setup, lol. It looks pretty reasonable, but I'm new at tuning as well so don't take my word as gospel. I've only been running about 15 degrees at 18PSI.
Oh I am too haha, I haven't ran this aggressive timing yet. I'm pretty sure on 18psi I've only been around 12-13° while I was dialing in my fuel map lol. It's wild when I see some of the fast people talking about running 30+psi and 20+° timing, I'm like holy crap!
Read those plugs my friend, they'll tell you everything you need to know.
I guarantee those guys running big boost and lots of timing are reading their plugs after every pass.
If you don't want to mess with that then just leave the timing low.
Read those plugs my friend, they'll tell you everything you need to know.
I guarantee those guys running big boost and lots of timing are reading their plugs after every pass.
If you don't want to mess with that then just leave the timing low.
Definitely for sure going to be reading plugs. I just want to make sure I'm headed in the right direction is all.
Here is my timing table. I run 91 octane spraying 2000cc of 100% methanol. I'm about 18ish degrees at 25 psi and according to the plugs I could continue adding timing
Here is my timing table. I run 91 octane spraying 2000cc of 100% methanol. I'm about 18ish degrees at 25 psi and according to the plugs I could continue adding timing
thank you for this. I’ll be taking some notes, it looks like I’m headed in the right direction then.
Man some of you guys are running some pretty aggressive timing...
If I were up at 10.9:1 compression I would certainly be starting lower than that and reading plugs to come up with my final timing.
I know last year at LS Fest I just kept reading plugs. The number that was in my timing table on that particular car, I'm guessing wasn't accurate. It was a completely SBE car I never setup a piston stop on. I won't say the timing number, but it's a Supercharged car with 21# of boost through it on E, and the timing and boost numbers were similar 🤣
I was actually waiting for the 60' timing to bite me first.
Man some of you guys are running some pretty aggressive timing...
If I were up at 10.9:1 compression I would certainly be starting lower than that and reading plugs to come up with my final timing.
You think I should knock about 5° out of everything in boost and start there?
Side note, you tuned my '00 Camaro back in the 2009 time frame in Az. Man that car ran great its whole life, I eventually sold it. But when I left the dyno that day and drove back to Yuma, the whole way home anybody and everybody could get a race. Couldn't tell me **** haha
I know last year at LS Fest I just kept reading plugs. The number that was in my timing table on that particular car, I'm guessing wasn't accurate. It was a completely SBE car I never setup a piston stop on. I won't say the timing number, but it's a Supercharged car with 21# of boost through it on E, and the timing and boost numbers were similar 🤣
I was actually waiting for the 60' timing to bite me first.
It's crazy how far off actual timing can be on some cars compared to commanded. Not sure if the reluctor wheel is just off or if it's slipped on some cars, SBE stuff especially with pressed on reluctors that aren't welded and are on 2 steps banging away I'm sure have something to do with it.
You think I should knock about 5° out of everything in boost and start there?
Side note, you tuned my '00 Camaro back in the 2009 time frame in Az. Man that car ran great its whole life, I eventually sold it. But when I left the dyno that day and drove back to Yuma, the whole way home anybody and everybody could get a race. Couldn't tell me **** haha
Damn, small world! Yes I personally would knock 5 deg out by 12 psi on up for starters just because you have a relatively high compression setup. Just remember, E85 actually burns faster than gasoline. It may not show knock, but it very well could be on the wrong side of the curve so to speak. Dyno's for verifying more timing actually adds power and reading plugs are your friend.
Damn, small world! Yes I personally would knock 5 deg out by 12 psi on up for starters just because you have a relatively high compression setup. Just remember, E85 actually burns faster than gasoline. It may not show knock, but it very well could be on the wrong side of the curve so to speak. Dyno's for verifying more timing actually adds power and reading plugs are your friend.
Damn man yall have me curious about my timing tables now, my tuner set them up for me so I really don't know to much about how they should look. When I get around my laptop ill post a picture of them just to see what yall think.
It's crazy how far off actual timing can be on some cars compared to commanded. Not sure if the reluctor wheel is just off or if it's slipped on some cars, SBE stuff especially with pressed on reluctors that aren't welded and are on 2 steps banging away I'm sure have something to do with it.
We are doing a real build now. This one is getting a timing pointer, piston stop, checking the timing against the Holley, you know, the complete works package 🤣
The owner will probably want more timing and I'm going to have splaining to do
Piston(20 over) and rod lc9, 243 head port, polished and milled .040 on e85
That has a little less timing in the one I tuned based simply on numbers in the Holley, but IMO you definitely should be reading plugs. I'm not going to say your dancing with the devil, but I think I hear music in the distance 🤣
That has a little less timing in the one I tuned based simply on numbers in the Holley, but IMO you definitely should be reading plugs. I'm not going to say your dancing with the devil, but I think I hear music in the distance 🤣
lol my tuner did all that when he tuned the truck, he built my shortblock as well. My heads were done by a placd called Calhoun motorsports. I had them on my stock block(lm7) and it at one time in its like snapped a rod in half and I had to mill. 040 to get the heads back right. He told me this is conservative.
lol my tuner did all that when he tuned the truck, he built my shortblock as well. My heads were done by a placd called Calhoun motorsports. I had them on my stock block(lm7) and it at one time in its like snapped a rod in half and I had to mill. 040 to get the heads back right. He told me this is conservative.
Well, it's really all relative though right because every combo is different.
It might be conservative for your combo at a given boost level?
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Boosted Timing Table 
