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From 373 to 430 now less acceleration???


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2011 F250 6.2 gas lifted 4" on 35" tires.

 

Just changed out the stock 373 for 430. Dealer said my 35" tires reduced my 373 to about 340 and a 430 would put it about 410 so I did it. Put 300 miles on it (hiway) and the mpg jumped from 12 to 14.5 hand calculated I guess cause the engine is not working so hard.. Happy about that.

 

I know this sounds unbelievable but I punched it at an intersection and my jaw dropped open!! The acceleration has been cut drastically!! Went from pretty snappy feeling to a DOG.

 

I'm wondering if they did something to the computer when they reprogrammed it for the lower gears for the speedo?

 

Maybe a tuner is the next step?

 

Thanks for any input.

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Yes it was snappy before. Been running the 35" tires and 373 gears for 33K miles. Maybe it will be better when the computer re-learns my driving style?

 

Hmmm, strange. Re-learning by the TCM may help a bit. I would expect it to be a bit more peppy with 4.30 over a 3.73. Could be as simple as a bad tank of fuel, too.

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2011 F250 6.2 gas lifted 4" on 35" tires.

 

Just changed out the stock 373 for 430. Dealer said my 35" tires reduced my 373 to about 340 and a 430 would put it about 410 so I did it. Put 300 miles on it (hiway) and the mpg jumped from 12 to 14.5 hand calculated I guess cause the engine is not working so hard.. Happy about that.

 

I know this sounds unbelievable but I punched it at an intersection and my jaw dropped open!! The acceleration has been cut drastically!! Went from pretty snappy feeling to a DOG.

 

I'm wondering if they did something to the computer when they reprogrammed it for the lower gears for the speedo?

 

Maybe a tuner is the next step?

 

Thanks for any input.

No speedo gears anymore. Everything is electronic. Did the dealer re-calibrate the PCM and the dash for a different rear axle ratio and tire size ?
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