Ltx total timing at WOT
Ltx total timing at WOT I have a solid roller 385 lt4, 11.6-11.8 compression and always ran 36* degrees at WOT. Starting to see some run upwards of 40*. What are most you guys with a good aggressive tune running? Just curious.
Is that 37* in the timing tables? If so, that sounds like way too much.
If the 37* is what's reported with a datalogger like Datamaster, it's probably still on the high side.
I run 29* WOT in the tables, which is 33 to 34 degrees total, as reported by Datamaster. Ported LT1 castings. 12:1 CR
If the 37* is what's reported with a datalogger like Datamaster, it's probably still on the high side.
I run 29* WOT in the tables, which is 33 to 34 degrees total, as reported by Datamaster. Ported LT1 castings. 12:1 CR
You cannot ask an across the board question, it depends on a lot of things, Like 96 stated, depends on chamber efficiency. then there is quench, how efficient you heads are ect. I have seen as little as 33* and upwards of 39* on a setup with that compression..
....and also depends on the mechanical variations/ tolerance stackups of every part from crank to cam to opti. That's why we have to dyno tune or track tune to find the sweet spot 
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
....and also depends on the mechanical variations/ tolerance stackups of every part from crank to cam to opti. That's why we have to dyno tune or track tune to find the sweet spot
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
Thanks for asking that question, That is whats entered in the tables, actual vary as you say, due to DA?, Humidity? ect dont know. I have not seen actual as low as yours, but in the 31-33 range...Again maybe Octane limited or type of fuel.
Trending Topics
....and also depends on the mechanical variations/ tolerance stackups of every part from crank to cam to opti. That's why we have to dyno tune or track tune to find the sweet spot
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
Moe, is that 33 to 39 range actual total advance? not what's entered in the timing tables?
Mine at 29* is the extreme low number AFAIK. The other few that I personally know of with compression, quench, and heads similar to mine range from 30 to 33 in the tables for best power, not limited by octane.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Apprentice
Joined: May 2009
Posts: 323
Likes: 2
From: NW AR
I ran 41 degrees timing on the distributor, with a weak advance spring to allow for starting but essentially the distributor was locked. Dart Pro 1s ported, ~13:1, flat top pistons, 396ci.
It was on methanol though. I was aiming at mixing nitro with the methanol which would require even more timing.
Was running high 30s with 150 shot nitrous, race gas, and methanol. Never did start leaning out the shot or playing with advance while reading the plugs. Could have really worked towards the edge. Just would look at the plugs to see if any problems and would take EGT readings every run.
It was on methanol though. I was aiming at mixing nitro with the methanol which would require even more timing.
Was running high 30s with 150 shot nitrous, race gas, and methanol. Never did start leaning out the shot or playing with advance while reading the plugs. Could have really worked towards the edge. Just would look at the plugs to see if any problems and would take EGT readings every run.