Just had Stang dynoed again. Have ???

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DCBigpimpin

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Jul 9, 2003

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TN

Sep 6, 2004

#1

• Sep 6, 2004

• #1

Ok my #'s are higher than the last dyno of 249.98 rwhp & 289.xx rwtq (sae). But my A/F ratio is still super, fat & filthy rich @ 12.5. I leaned it out by 5% to get it in the 13.0 - 13.1 A/F range with my Diablo Predator. So my question is how much of increase would I see if any? Now I'm not expecting an 100% accurate answer. Just want to know from others experience from leaning the A/F ratio out how much of an increase did you get .

 

Redfire03GT

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Sep 10, 2003

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Newark, CA.

Sep 6, 2004

#2

• Sep 6, 2004

• #2

12.5 isn't that bad. At what rpm range were you hitting the 12.5? I hit 12.5 a/f ratio at around 5k and it stayed there until 6k. Personally, I feel safer with it being that rich at higher rpm's.

With the leaner a/f ratio, it would all depend on where it was leaned out at. Potentially, you might see another what... 5-10hp, tops, me thinks. Nothing dramatic.

 

D

DCBigpimpin

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Jul 9, 2003

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Sep 6, 2004

#3

• Sep 6, 2004

• #3

Redfire03GT said:

12.5 isn't that bad. At what rpm range were you hitting the 12.5? I hit 12.5 a/f ratio at around 5k and it stayed there until 6k. Personally, I feel safer with it being that rich at higher rpm's.

With the leaner a/f ratio, it would all depend on where it was leaned out at. Potentially, you might see another what... 5-10hp, tops, me thinks. Nothing dramatic.

Click to expand...

Well from the graph it looks like it's 13.97 A/F (lean) @ 2240 rpms and drops to ~ 12.7 @ 2800 rpms. Then goes up to 13.0 A/F @ 3100 rpms. After that it's a steady drop down hill to 12.25 A/F @ 4500 rpms then another drop to 12.1 A/F @ 5570 rpms

 

Redfire03GT

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Sep 10, 2003

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Newark, CA.

Sep 7, 2004

#4

• Sep 7, 2004

• #4

That's not bad really. Sure, a tune could help but, I wouldn't expect much out of it at this point. A flat 13.0 would be ideal, me thinks.

 

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blkchevyz

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Sep 3, 2004

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st charles MO

Sep 7, 2004

#5

• Sep 7, 2004

• #5

DCBigpimpin said:

Well from the graph it looks like it's 13.97 A/F (lean) @ 2240 rpms and drops to ~ 12.7 @ 2800 rpms. Then goes up to 13.0 A/F @ 3100 rpms. After that it's a steady drop down hill to 12.25 A/F @ 4500 rpms then another drop to 12.1 A/F @ 5570 rpms

Click to expand...

what would probably help is get some more fuel on the low end, try and get around 12.5... and after peak torque lean it out to around 12.9 13.1

torque likes to be on the rich side.

i just order a predator so with it and my wide band o2 i hope to get it dialed in

 

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GinoGT

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Aug 11, 2002

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Sep 7, 2004

#6

• Sep 7, 2004

• #6

On an N/A car, I wouldn't be worried about going 13:1. Forced induction is where I would want to play it safe because of the risks involved.