Boost and timing
Boost and timing im one of those kind of guys who likes information. I’ve done some searching and I can find four cylinder threads on timing but no ls specific threads. I did read the boost and sbe thread and some but very few people listed their timing. I’m curious to know what you guys are running for boost pressure and timing under boost. If you know your iat’s and and afr’s that would be cool to list too. I’m interested in what you guys are running.
Lot of threads on this subject. I know you searched, but I've seen plenty. Everyone will say to read the plugs and that'll tell you what timing the motor wants. Plenty of people start at 14 psi and 14 degrees and drop from there. I'm more conservative than that and verified with plug reading. Usually anything over 10 psi on a 76mm turbo build and I'm in the 12* range. 93 pump, no meth.
Lot of threads on this subject. I know you searched, but I've seen plenty. Everyone will say to read the plugs and that'll tell you what timing the motor wants. Plenty of people start at 14 psi and 14 degrees and drop from there. I'm more conservative than that and verified with plug reading. Usually anything over 10 psi on a 76mm turbo build and I'm in the 12* range. 93 pump, no meth.
im definitely not meaning to repeat what we have, but doing a search I came up fairly empty handed except when I started sifting through threads. I did find some info but it was tid bits added into threads created for other reasons. My reason was I hoped that we could talk about just thinking and boost. And I forgot to mention the fuel being ran. I personally am mainly interested in pump gas because we don’t have much access to e85 just yet. So forgive me if there is a thread like this that I couldn’t find
I’m more specific than just copying a whole area with the same timing number. At higher rpm I’m running 5 degrees more timing than I am at say 4000 rpm in boost. For a street car in some very low rpm in high gear I have way less timing.
so say I have 7psi then you’d have it at 21? Hmmmm. I was told my 18 was too high for pump gas and 7psi. I’m not doubting what you say by any means. I just find it interesting. My car does seem to run better at 18 degrees too. I haven’t done a lot yet to see if it’s pulling timing. Being lazy right now because it’s so hot Outside i don’t even want to drive it.
understandable. I’m just trying to rough it in for now. I’m actually so burnt out from building the turbo setup that I haven’t felt like doing much tuning. Just wanted to get some experienced guys answers before I delved back into it. Plus I’m sure I’m not the only noob this info would help!
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understandable. I’m just trying to rough it in for now. I’m actually so burnt out from building the turbo setup that I haven’t felt like doing much tuning. Just wanted to get some experienced guys answers before I delved back into it. Plus I’m sure I’m not the only noob this info would help!
My peak is only 17 on E70 stock ls1 compression and 10 psi but I will not add any more until I can get to the track to see if I gain any mph from it. Currently zero kr and timing mark just past the bend. Afr between 11.0 and 11.5 on the gas scale.
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understandable. I’m just trying to rough it in for now. I’m actually so burnt out from building the turbo setup that I haven’t felt like doing much tuning. Just wanted to get some experienced guys answers before I delved back into it. Plus I’m sure I’m not the only noob this info would help!
I've been told that its way too much timing dozens of times, especially for an engine with 10:1 compression. 3 engine tear-downs and there isn't even the slightest hint of detonation anywhere.
21 degrees at 7 PSI is still relatively safe, especially with a good AFR.
I run 12 degrees of timing at anything above 14 PSI on 93 pump gas. That includes when I set it to kill at ~26 PSI.
I've been told that its way too much timing dozens of times, especially for an engine with 10:1 compression. 3 engine tear-downs and there isn't even the slightest hint of detonation anywhere.
21 degrees at 7 PSI is still relatively safe, especially with a good AFR.
I've been told that its way too much timing dozens of times, especially for an engine with 10:1 compression. 3 engine tear-downs and there isn't even the slightest hint of detonation anywhere.
21 degrees at 7 PSI is still relatively safe, especially with a good AFR.
My cam cam is a 227/234 non turbo cam. Some of you know that, some don’t. Maybe that’s why I’m getting away with 18 degrees like I WAS lol. Because it’s backed down a couple degrees now because some of you guys in another thread scared me lol.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
My thoughts are (and take them however you want). Start at what i consider NA timing for a stock 5.3, 24ish, take 1/1 but dont start for a few psi. Be all out before meat of the torque hits, and stay out until 5500+, then you can bring some back in as rpms continue to go up. Seems like 93 vs e85 is around 6 degrees more timing allowed for E. This is just stuff I've gathered from reading others posts.