| A stock ecu. Newer standalones (pro efi, Infineon) and alot of oem manufactures use this on stock tunes(I know every car isn't custom tuned ). I believe you just set the target o2 and the the tune will adjust to hit that A/F. As far as the E85 I just ordered this sensor for my Z
Gmc flex fuel sensor 113577394
Pigtail 13352241
The software should take your 91 tune and e85 tune and use those maps to average and deliver a safe power level based on your ethanol level, they sell gauges too so you can constantly view your ethanol content. Luckily my E85 update allows my serial data gauge to pick up the sensor reading. It came to less than $100 and it's the same sensor that zetronixs buys and just marks it up double. I don't use it, I use an AEM boost solenoid, but check out the Mac boost controller on ebay. Some have barbs, some quick connect. Suppose to be the same solenoid just not marked up. I recently saw a post on here were ol' buddy is using two solenoids, at first I thought it was over kill but then he explained it to me and it clicked. 2 is better than one in our instance.
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