LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Help Evaluate my Dyno Graph

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Old Jan 25, 2004 | 02:15 PM
  #1  
whontime's Avatar
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From: Cullman,AL
Help Evaluate my Dyno Graph

I wanted to get some opinions on what my problem may be. My car is not pulling as high as I expected that it would and I really don't know what to pinpoint as the problem. On this dyno run we pulled the car until it stopped pulling which was about 6200 or so. You can see how the dyno just falls off rapidly. The car feels like it hits a brick wall at 6200. I know XE's are known for not pulling high, but on a ported heads car I should see more. Thanks in advance for any help.
Dyno Graph
Hopefully this link will work.
EDIT: Hold up the graph is crappy looking and unreadable. Give me a few minutes to fix it.
Sorry guys, this is as good as I can get it. You may not be able to make the entire graph out, but you can see that it falls off right after 6K and dies out by 6200-6300.

Last edited by whontime; Jan 25, 2004 at 02:39 PM.
Old Jan 25, 2004 | 02:50 PM
  #2  
Fastbird93's Avatar
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From: Waynesboro, PA
Honestly I would expect more out of that combo. That's pretty low considering the cam and head combo.

Your A/F ratio is rich (thanks tripintaz!!). You should try to get that brough up to about 13.0 at WOT. It's definitely costing you some HP across the board.

Looks like the HP peak comes at about 5600 RPm and drops off pretty quickly after that. Could be an A/F thing because you were only at 11.8 at 5600.

Last edited by Fastbird93; Jan 25, 2004 at 04:09 PM.
Old Jan 25, 2004 | 03:10 PM
  #3  
TriPinTaZ's Avatar
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Your air fuel ratio is RICH, not lean. that is defianatly costing you some power. lean it out some to about 12.8-13.2 you will gain some more power
Old Jan 25, 2004 | 04:10 PM
  #4  
Fastbird93's Avatar
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From: Waynesboro, PA
Fixed.
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