I have a 2.8 and 60's. I could literally **** on a e85 station from my house. So, with the very real possibilty of getting HPT within the week. I figure why not? I have found some tunes on HP forums that are similar to mine so far as mods go. 2.8/60s blah blah....whats the suggestion? Can I flash a tune from there on my car, and tune from there with e85. Switch back to another tune when I cant run e85?

 

From what I hear most that are running e85 are running 80's. I haven't heard of guys running on 60's

 

Yup. You need 80s to do E85.

 

Yes, you'll need 80s. I also have the ZZP BRFPS and a new fuel pump, but those aren't basic needs for E85.

 

80s are needed. I have tuned E85 on a 2.8" with 60's but it was too close to static for my liking.

 

I ran a 2.9 on 60s and I think thats the lowest safe pulley size

 

Also, be aware that if this is your only E85 station that i see these pumps as "unavailbale" quite often. I swear its annoying when i drive 10 miles out of the way just to see the 2 stations E85 pumps have bags over them.

Something to keep in mind, i just advise never running too low on gas and getting stuck.

 

Yep. Treat the 1/2 tank mark as if it were E. I got screwed on this one time. Station was completely out and I didn't have enough to get the car to another station.

 

You can always call ahead....

 

Hey do you consider a certain IDC static. I have 60s with a 3.1 on my 2.4l and I was seeing 110% IDC at 7200rpms. I was still able to easily dial in the afr at this point no problem though. Does the pcm use the injector flow rate table to calculate this? I am wondering if the IDC is off since it can only read ~63.5?

Also what afr do you run on e85? I have two tunes I was playing with. I was trying rich and lean afrs @ .74 and .84 lambda. I made noticeably more power(butt dyno) with the richer afr, but I didn't want to go richer(for testing) since I was seeing such a high IDC which is why I was wondering if it is even calculated properly with large injectors. @ .84 I only saw 91% IDC.

I picked up 80s so I can pulley down to 2.7" as well, just won't get around to that for a few weeks.

I was told I will need the BRFPS as well. How is the tuning without it?

 

80s is a must. id also invest in a return style fuel system or ZZP Boost reference fuel system. it allows for much more aggressive tuning because in theory each injector is getting the same amount of fuel, youre not starving number 4cyl from fuel. which is a common reason why people always nuke number 4 piston. and unless you feel like carrying your laptop with you or a spare pcm to swap back from e85 and premium fuel tunes id suggest you stick with one fuel. "flex fue"l cars are equiped with an ethanol sensor and that sensor tells the pcm to adjust accordingly depending on which fuel you are running at the time. our cobalts do not have this sensor unless them came from the factrory as "flex fuel" which i dont think there are any? someone can correct me on that.