Is a E85 chip needed?

[BABY BOEING]

I'm considering using E85, my question is can I just use a race chip with lets say 24-28 timming and just increase my fuel pressure 20% to start and then tune boost and fuel pressure to get O2's in line? Is high 780's-820's O2 voltage still a good number to shoot for using E85? Thanks in advance, Jon.

 

[novaderrik]

i think the readingso nthe O2 sensor should be about the same as what you shoot for with gas- it is, after all, a reading taken after combustion that measures the amount of free oxygen in the exhaust stream.

 

[TA49-WE4]

One problem you may run into is that the car may be VERY hard to start when the engine is cold if your going to run 100% E85. As the cranking pulsewidth needs to be alot more with E85.

You do shoot for the same numbers when you tune 750 to 800 on a scanmaster etc.

I say give eric at turbotweak a call and just get a E85 chip. No use in having your tune all messed up and trashing your engine over a less the $100 dollar chip when there is one out there to buy that works. Just my .02 cents.

 

[BABY BOEING]

Thanks for the reply's guys.

 

[novaderrik]

One problem you may run into is that the car may be VERY hard to start when the engine is cold if your going to run 100% E85. As the cranking pulsewidth needs to be alot more with E85.

You do shoot for the same numbers when you tune 750 to 800 on a scanmaster etc.

I say give eric at turbotweak a call and just get a E85 chip. No use in having your tune all messed up and trashing your engine over a less the $100 dollar chip when there is one out there to buy that works. Just my .02 cents.

my experience with straight E85 and the stock 84 ecm with what i think are the stock injectors was that it started al ittle bit harder and ran a little choppy for about 30 seconds when the air temp got below about 40 degrees- but with the 87 ecm and the LeSabre chip that was in it when i got it (don't worry-a TT E85 chip and 60# injectors are in it's not so distant future) was that it started right up and purred like a happy little kitten with the air temp right at about 30 degrees last weekend. that was with a half a tank of fuel that i got last June before the stock fuel pump died. i drove it 35 miles last weekend and it ran smoother than it's ever ran since i got it.