How much timing on 7 psi ATi
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From: Beaver Falls, PA
Re: How much timing on 7 psi ATi what are you tuning with? do you have a scanner of any sort? intercooled right? extra pump? cold tstat? how many rpm do you want to turn(boost is porportonate to rpm)? how long do you want it to last? plan on rebuilding/replacing your transmission soon?
did the plumbing that came with yours suck as much as mine did? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
did the plumbing that came with yours suck as much as mine did? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
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Joined: Feb 2002
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From: ohio
Re: How much timing on 7 psi ATi Cold T stat Large intercooler(22x12x3 with 3" inlet and outlet) in a light car(2900lbs) with 390 gears. 255lph pump LS1 edit with wideband O2 on dyno, and Snap On scan tool.At what rpm should 18 degrees be seen?
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From: Raleigh, NC
Re: How much timing on 7 psi ATi I ran 22 degrees at .80 to 1.00 kpa with zero to max 1.9 KR with 5 PSI (6000 RPM's) to 7 PSI (6600 RPM's).
I STILL ran 22 degrees timing running 10 PSI boost, but it took mixing 100 Octane with 93, or adding 1/2 can of TORCO Octane Booster. I did that for street driving and mixed 100 Octane when I went to the strip.
The difference in power between 18 degrees and 22 degrees is substantial. But, you got to be willing to do what it takes to keep KR below 3.0 and detonation eliminated.
I personally don't stress over 1 or 2 degrees of knock retard. Audible knocking or greater than 3 degrees of KR I do something about.
Good luck!
I STILL ran 22 degrees timing running 10 PSI boost, but it took mixing 100 Octane with 93, or adding 1/2 can of TORCO Octane Booster. I did that for street driving and mixed 100 Octane when I went to the strip.
The difference in power between 18 degrees and 22 degrees is substantial. But, you got to be willing to do what it takes to keep KR below 3.0 and detonation eliminated.
I personally don't stress over 1 or 2 degrees of knock retard. Audible knocking or greater than 3 degrees of KR I do something about.
Good luck!
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From: Raleigh, NC
Re: How much timing on 7 psi ATi PS: I ws only running 11.7:1 peak A/F ratio at the time I did this, too. With more optimized A/F, I may not have been able to do this... I don't know.
Running rich kills power, too.
<small>[ February 21, 2003, 08:56 AM: Message edited by: Black LS1 T/A ]</small>
Running rich kills power, too.
<small>[ February 21, 2003, 08:56 AM: Message edited by: Black LS1 T/A ]</small>
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Joined: Nov 2001
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From: Pleasanton, CA
Re: How much timing on 7 psi ATi I run 17. Since 91 octane comes out of the CA pumps, we tuned to that. Anything 18 or higher just put me into KR, and I didn't want that. I also run my A/F under 12.0, more like 11.5 - 11.6
I suppose I could make more than 462 on my stock engine if I got a bit more aggressive with tuning. But I didn't want to be a slave to that 100 octane mixed fuel on my daily commuter.
Mike M
I suppose I could make more than 462 on my stock engine if I got a bit more aggressive with tuning. But I didn't want to be a slave to that 100 octane mixed fuel on my daily commuter.
Mike M
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From: Austin, TX
Re: How much timing on 7 psi ATi </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1slowCamaro:
<strong> How much of a power difference is there between 17 degrees and 22 degrees timing? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is a guess but I would say about 40hp if you can get there with no KR.
22 seems way too high at peek tq on pump gas. 22 up top might be good.
You need it to be a few degrees lower at peek tq and then ramp it up towards redline. I would start at 15 and add until you see KR.
<strong> How much of a power difference is there between 17 degrees and 22 degrees timing? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is a guess but I would say about 40hp if you can get there with no KR.
22 seems way too high at peek tq on pump gas. 22 up top might be good.
You need it to be a few degrees lower at peek tq and then ramp it up towards redline. I would start at 15 and add until you see KR.
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From: Maple Grove MN
Re: How much timing on 7 psi ATi I might try and bumb it up a litte since I run straight 100 octane all the time. But I'll have to tune while using nitrous or I could set myself up for some problems. Still probably wont go over 20.
Justin
Justin
