You def need a tune to run e85 unless you have the regular regal turbo
No doubt, i was running fine under 4k rpm on E85 but for shits i did a pull in 6th gear on the highway on the way to ZZP and it threw 3 or 4 codes.. i took a pic of them il post... Regardless, it still drove fine all the way there.
Update: I dropped my regal off at ZZP when they opened this morning, originally, my plans were to do an
intake cam w/ upgraded fuel pump lobe, and maybe some goodies like
intake piping etc. with a nice clutch. Tim @ ZZP is undoubtedly one of the nicest guys i have ever met at a speed shop and hands down the best customer service. Originally i was going to net around 320-330 whp with the e85 and tune, then do a precision wheel upgrade and net around 380whp max. However, Tim believes that my clutch being 10k miles on it will last quite a few more miles and is going to make the boost come on more gradually. I decided to go with a ZFR turbo, and i will sell my stock one. We also think our piping is somewhat strong, and will hold around 25lbs no problem. The last issue is the trans, at which point my research showed that our trans (F-40 if im correct) is actually very strong, granted it wont take much over 400 TQ... the 6 speed is an upgrade for the 5's in cobalts and much stronger.
This set up, ZFR, conservative 85 tune- should get me around 380whp, with the option in the future to do cams/springs/clutch and net around 450whp no problem. As far as and LSD, which i mentioned to Tim-- thinks that with the amount of power il be pushing it will blow both tires off the ground. Ultimately, it should not be a limiting issue. Again, im no mechanic, nor am i claiming to know everything. So for those that want to bash it, take it elsewhere. I am simply experimenting and will report back as i drive the car. I rarely beat on it, but expect it to be ran through its paces.
The regal should be done no later than Wednesday... hell, before i left the shop it was already being torn apart

. I told Tim that maybe in a couple months when i get more time i will drop it off for a couple weeks and have some IC piping/front mount mocked up so we will have some more
mods available.