i was wondering how to set timing to 28* for total timing. on edit do you just set everything to 28 or only certain cells any help appreciated

 

You select the cells that you want to have 28*. I would hope that your entire timing table is not going to be 28*

 

I think he wants to know what kind of curve he should set.

Maybe he wants to increase the timing at idle but doesn't know if he should keep the rest of it the same.

 

well i have seen in diffrent articles where they state the total timing set to 32* and others where the timing is 32* at 3200 rpm i want to know also what is a safe timing to run 150 to 200 shot wet nitrous.

 

I would bump the entire WOT part of the curve enough to get the top number to 28. I wouldn't change the shape of the curve without doing carfull and repetitive knock sensor monitoring.

 

Sorry for the question. Trying to learn.

Don't you usually back off timing at WOT and add it at idle? How does that help?

 

idle/partial load timing is TOTALLY different than WOT timing (and generally higher)

WOT 27-28* seems to yield best results ... (note this is 28* only under WOT situations...

however... unless you have a scanner software (Like HP Tuners and EFI Live come with ... unless LS1 Edit has made a new version since 12/04, which was 1.00F ... I would invest in some real scanning software... or trade in Edit for a full tuning suite) I wouldn't touch timing (or rather wouldn't raise it... lower is fine.. raise it w/out scanning feedback... and you're tuning blindly)

 

here is a stock 01 WOT timing chart, vs the GM Racing ASA spark table for WOT. Note the shape is generally the same, but more aggressive in slope and total timing.

This is for a 12:1 engine running 100 octane fuel, ported heads, open exhaust, largish cam, etc.

 

I'm trying to learn too...but the first thing I noticed on Dave's reply is the 100 octane fuel. Most of us don't have access to 100 octane fuel for our daily or otherwise modded cars. I usually don't fill up with 104 when I leave the racetrack

What would be the timing on 91 or suspect 91 octane? If I read the graph right, it looks like about 20-22 degrees of timing for the stock car.

 

I would probably only go a couple degrees lower than on a 93 octane tune, 91 I would say around 24-25* WOT timing, i have it set at 26-27* on mine, i run 93.

Chris

 

it was not my intent to show the proper curve, just showing two extremes, and how the shape of the curve can vary. Please don't try and run your street car with 32 deg on 91 octane!

btw, since gas has gotten so expensive, paying $3.99 for 100octane really doesn't seem so bad anymore! Unfortunately, it's around $8 at the Pro Races (for the same stuff)