loss of power in 4th and 5th gear
May 3, 2014, 06:05 PM
#1
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loss of power in 4th and 5th gear
So recently I noticed my car had a very noticeable loss of power. I was on the highway, did a 5th gear pull and at 5k rpm or so it starts bogging a little and making a growling vibrating sound. Definitely not marbles in a can as I've read about detonation.
So now it will rip 1st through 3rd like it always has, but 4th and 5th bog down. The car was tuned on the rich side for e70 and to lean out with e85. So this did start happening after I started filling up on e85.
Could this be my tune? Please, any help will be much appreciated
So now it will rip 1st through 3rd like it always has, but 4th and 5th bog down. The car was tuned on the rich side for e70 and to lean out with e85. So this did start happening after I started filling up on e85.
Could this be my tune? Please, any help will be much appreciated
May 3, 2014, 06:37 PM
#3
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Really? I am having a 2nd gear pop out if I downshift into second really hard. I don't have another map, all I can do is go to the gas station that has e70 all year round a fill up.
The tranny was gone through recently and anything needing replaced was replaced.
The tranny was gone through recently and anything needing replaced was replaced.
May 3, 2014, 07:04 PM
#4
It is possible for 2 gears to be no good but it would happen at all rpm's i would think. Does it happen at cruise on 4th and 5th? or only when your at WOT and over 5k rpm?
And why wouldn't you have a pump gas map lol that would be an easy way of seeing if its your fuel thats causing the issue.
And why wouldn't you have a pump gas map lol that would be an easy way of seeing if its your fuel thats causing the issue.
May 5, 2014, 05:48 PM
#7
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It has to be your tune. You said it happened after switching fuels. Pretty cut and dry to me. In the higher gears you hit higher load cells and therefore a different section on your timing and fuel maps. Also you boost is typically higher in those gears. Do you have a wideband? What are your afr at wot
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May 5, 2014, 06:10 PM
#8
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I do have a wideband, I glanced at it once when it was wot and I'm not sure, but I think it was 11.8-12. I'm going to switch back to e70 to see if it goes away, that is after I swap my radiator out. That won't be for at least a month
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