tbh i retune around 3 e85 cars a week from other shops (please understand i dont mean all just some) and tbh some tuners still dont understand E85, we generally get a gain every time. we dont do drag cars (i have 0 intrest in drag) but EVERYTIME the owner will better their PB at any given circuit track.
70-80% of our tuning is now e85 so we live and breath it daily, some cars dont get the benefits but many do, the cars that do are the ones limited on 98 by a fundamental element not turbo sizing and -7's fall smack bang in this category. S15 are another good example 220rwkw on the std turbo up from 195rwkw is a common result.... normally restricted by a so called too small a turbo.... 11% increase on such a small output is super impressive.
Generally a GTR making 310-315 will always make 340-350 on e85 with no increase in boost if tuned correctly (providing there are no intake or exhaust bottlenecks). The basic rule of this extra power is the same rules that gain power on 98.
i know we are getting legit results just by the numbers in the mapping, anyone who understands the fuel will know what im referring too.
Ash im happy to show you in person where these other tunes are falling short. i have all the saved maps from the cars im referring too.
Also if anyone is not getting the results they should im more than happy to view their ecu file and give feedback on why they havent got the results.