Dynoed today (stock) comments please?
Thread Starter
Staging Lane
Joined: May 2004
Posts: 92
Likes: 0
From: Loma Linda, CA
Dynoed today (stock) comments please? Well I dynoed my car for the first time today. I had warranty work done a few months back and they gave me a new engine, it has about 6500~ miles on it. I'm content with my numbers. After reading a couple posts I was just wondering about my A/F ratios and if they are ok? or are they a little rich? So if someone could just comment on my dynograph that would be great!
TECH Enthusiast
Joined: Sep 2004
Posts: 564
Likes: 0
From: Omaha, NE
Almost every stock car that we have dynoed are biased too rich at WOT from the factory, high 11s, low 12s for N.A. engines. Possibly two reasons why they do that, the old addage, if were going to be off let's be too rich and the CATS can overheat and plug if too lean at WOT. Yes, you could pick up another 5-15 RWHP, varys from car to car, by leaning to approx 13:1 but this should be done with a custom reflash of PCM. Your power graphs indicate something going on after the mid 4000 RPM range, possibly knock retard. If you are getting KR on an enertia dyno you probably are really getting it on the street, running good fuel? Again, for max power a custom reflash while monitoring KR custom ign timing curves may be in order. Three pulls on a stock engine should have identical graph overlays or look for problems.
EJ
EJ
Thread Starter
Staging Lane
Joined: May 2004
Posts: 92
Likes: 0
From: Loma Linda, CA
Originally Posted by dynocar
Almost every stock car that we have dynoed are biased too rich at WOT from the factory, high 11s, low 12s for N.A. engines. Possibly two reasons why they do that, the old addage, if were going to be off let's be too rich and the CATS can overheat and plug if too lean at WOT. Yes, you could pick up another 5-15 RWHP, varys from car to car, by leaning to approx 13:1 but this should be done with a custom reflash of PCM. Your power graphs indicate something going on after the mid 4000 RPM range, possibly knock retard. If you are getting KR on an enertia dyno you probably are really getting it on the street, running good fuel? Again, for max power a custom reflash while monitoring KR custom ign timing curves may be in order. Three pulls on a stock engine should have identical graph overlays or look for problems.
EJ
EJ
