Quote:
Originally Posted by NG329
I run E40 and the car loves it.
I've seen guys drive themselves crazy over this but honestly it's very simple.
Pump 93 is 10% Ethanol near me and I have access to E70. For street driving I start with a full tank of 93 and whenever I get to half a tank I just fill up with 9 or so gallons of E70. Gets me in the ballpark every time. If I get it wrong, as long as I'm in the range of E35 - E45 the tune will still run great.
When I go to the track, I carry 20 Gallons of E70 with me and in the morning I fill up with Pump 93.
After the first 2-3 morning sessions I'm down to just a little below half a tank. I fill up with two jugs of E70 and I let rip during the 3rd and 4th sessions. Then when I get down to half a tank again, I fill up halfway at the pump and I pour in the 3rd jug of E70. For sessions 5 and 6. Very rarely will I use the 4th jug of E70 unless we go open track or I'm flying out there and buring more fuel than usual.
If your MAF is set properly you only need to give attention to the Power Enrichment in HP Tuners. That should get you around Lambda 0.78 - 0.82 and with 93 I like to be around 0.82 - 0.85. Maybe one of the super technical guys will check me on these numbers but so far it has worked for me and nothing has blown up yet.
Install a Wideband ASAP to take the guesswork out of things. I just put mine back into my '21 over the weekend and I wish I've done it sooner.
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.78 is too rich imo. Pump gas should be richer than Ethanol. I target .81-.82 on pump and .83-.84 on E with LT4 stuff. If the pump gas tune is dialed then you don't need to change much for E far as AFR. The ECU will adjust if the tune is setup correctly.