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Research will show how a J&S Knock Controller works but to sum it up, it is a module that works in conjunction with the stock ecu by intervening ignition signals and it retards the timing when detonation is detected. Add the meter and you can see it happening, raise your boost levels until you see it light up the gauge and then back off boost until you don't see it. It is that simple. Will you be extracting every ounce of power? No but you will protect against variances in fuel and get the most out of your current tune. Aren't you worried that the super unleaded 91-93 octane your buying at the pump is really 91-93 octane? Are you sure the gas station owner didn't cheap out and have it switched out with a lower grade fuel every now and then? Pump gas may not have as much of a content swing as E85 but.... E85 is awesome. I too was going to run Q16, I mean if you have looked at any high horsepower dyno graph then you can't help but desire the stuff, and then I tried to buy some. Called all of the race shops and fuel suppliers that I could find by word of mouth and google within a 2 hour drive from my home, none found. I was running 108 low lead and I tuned it, honing it in for weeks. Best run was around 550 hp with nitrous on using Virtual Dyno (around 480 without nitrous), switched one evening to E85 running same stock fuel pump, same Nismo 740cc injectors, same stock regulator, same everything. Tuned it in less than an hour and Virtual Dyno went up to 672 HP without nitrous. Car was excellent and ran stronger all of the way through and no need for nitrous afterwards. Both tunes were at max boost at 2.1 bar but I was able to add timing from bottom to top. Unfortunately I hadn't tried E85 before going to ZNationals this past year but I can tell you that Virtual Dyno was within 20HP compared to Z1's Dyno and I turned 584HP with nitrous on and I can't remember exact numbers without nitrous but it was just under 500. That was using 108 low lead. I will add that I was running Nistune, Innovative Widebands, and a J&S Knock Controller to tune my car. The E85 numbers was not on a Dyno rather an estimated HP using recorded runs on Nistune and laid into Virtual Dyno. Not only did the numbers go up but the car felt so much better and spun Nitto NT05 275/35/18 at 80+ mph consistently and it would not before. There are a million reasons not to step out on the E85 ledge, one of which is the unknown long term effects, but I for one will be running it until I find a better, more accessible fuel. Ask any of the guys from the St. Louis SZ tune they know what E85 is all about. If you know me, then you know my current build is centered around the corn.
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