HELP! I think I got burned by a bad tune!

nightfire

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I had the car tuned about a week and a half ago. I was disappointed with the results but that was because I was experiencing massive belt slip.

Since then, I've posted the dyno graph on facebook (mod motor mustangs) and it has been taking an absolutely ass-raping. Just about everyone is saying that it is the worst graph they've ever seen.

Mind you that this is through a stalled 4R70W automatic tranny.

How bad is it :cry:

15xslcg.jpg
 

Musturd

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That's a pretty nasty looking graph . What were the air fuels like ?
 
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nightfire

nightfire

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That's a pretty nasty looking graph . What were the air fuels like ?

I didn't get to see the AFR's but he assured me that they are solid and a bit on the rich side for safety. Would the belt slip explain the erraticness (say it was crazy bad slip)?
 

g36 monkey

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If you were slipping REALLY bad, I could see it making your numbers erratic
 
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nightfire

nightfire

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It's slipping REALLY bad. The 3" pulley just doesn't like the stock 6-rib/tensioner. My tuner said that it was literally slipping off idle. 3" is coming off ASAP.
 

RichV

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I have some power vs MPH graphs and they are not as smooth as power vs RPM.

Belt slip, MPH graph, and not seeing AFR is tough to diagnose a tune IMO.
 

g36 monkey

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I have some power vs MPH graphs and they are not as smooth as power vs RPM.

Belt slip, MPH graph, and not seeing AFR is tough to diagnose a tune IMO.

Good call on the MPH, didn't notice it, usually expect them to be RPM relevant lol
 

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