Quote:
Originally Posted by 135iam
I think the answer is both, and I am wanting to know the same.
I have been running between 40-45% E85 mixed with 93 octane for 8 months with no issues in the logs (JB4 map 5). I dont really understand the whole "backend flash" process, so I need to get educated on that
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Piggybacks have limited control over fueling. Actually, they have almost no control over fueling. So you need to add a flash tune to properly handle VANOS, timing, fueling and trims, etc. You'll run out of headroom with a piggyback around E30-40. With that said, the JB4 has some nice features when it comes to AFR failsafes.