I've been running E85 on the stock fuel system for a couple weeks now and it runs good (aside from cold start) and seems to like boost. I did a mix trim of 25% on the Microtech and then fine tuned for cruising. First time under boost it leaned out really bad so I had to let off. I added like 5 notches, then 4 notches under boost and still lean. Finally just added a whole millisecond on each spot and now it's too rich so I'm close. This is of course on top of the 25% trim setting.

Anyway, I can't seem to find decisive info on if my Walboo+Marren injectors and stock system will last. Main concern is fuel tank, if I do need to replace where can I get one or is there a coating they could do inside? Then fuel lines and FPR. If I need to do fuel rails I should be fine just getting the stock ones anodized.

Also, what about timing? It was tuned for premium before conservatively by a good mechanic. The max advance it will do is +28. I did a trim setting of 3 degrees advance and just doing that raised that idle by 150rpm. Being 105 octane what is a safe timing advance due to the slower burn? I'm at 14psi on the stock turbo and large streetport. It does drop down to 9psi at higher rpms.



I like running this and am going to do it for sure and eventually distill my own.

i think the tank is ok, but ALL of the rubber in the system might not be. pulsation damper, regulator, lines....

You need more injector.



What AFR are you tunning for?

First off my email notify isn't working, will have to look into that.

I'm tuning for standard gas settings of 14 cruise, 11 boosted. It's a starting point anyway. I read somewhere if your O2 is setup for gas just divide by 1.5 so 14/1.5 is 9.3 with 9.8 being stoich for alcohol. The reason I'm doing that is my gauge stops at 10 so I'd always be pegging it and it would be useless if switched to alky. Because it runs cooler do you run it that rich under boost like with gas? 11 gas gauge would equal 7.3 acutal.



I've got 550 primaries and 860 secondaries on the stock s5 turbo right now. But I have a pair of 1200's sitting around if needed (for later turbo upgrade). Are you running it Ronin? I remember seeing your name when I was trying to find info, but I can't remember if you were or just thinking abou it. Oh and I am premixing MMO, not sure if that's the best choice or not. I have some Petit synthetic I was saving for once I get it all tuned up good.



I found a fuel tank coating called Red Kote that is alcohol safe, now I just gotta find a place that does it. If I can find my old fuel rails I have an aftermarket FPR I can put on (running s5 rails atm.) The rubber stuff is all new within the last couple years so I think I'm okay with that. I think I just figured out why it's leaning out at first, it was because my secondaries weren't kicking in soon enough (3000rpm) for the quick boosting. I thought it was the throttle pumps or something but I watched the digital rpms on the AVC-R and it was boosting before 3k.



CURRENT MAIN ISSUE: I still don't know what's going on with the cold starting, it backfires like crazy and takes many tries when cold to get her going. When warmed up shes fine. This morning it sounded like someone fired a gun at one point, and most of it happens after you let the starter off and give it a little throttle to help. Anyone have any ideas on this? Am I getting too much fuel, not enough, or maybe need a timing adjustment?

actually you can tune to the lambda number, and use the same target ones you'd use for gasoline.



you can either put the larger injectors in now, or wait and see...



that premix should be ok, id maybe run a little more



the rubber issue is a compatibility one, if the fuel systems rubber isnt compatible it doesnt matter how old it is, its going to turn into a bananna. keep a close eye on all that stuff and i guess we'll see



you current main issue; whats your cranking timing? fsm says 5btdc, start there. if its backfiring into the intake it might be too advanced

I need to figure out why I'm not getting notified of new replies. Anyway, I thought I broke something when I was forced to run 4 gallons of leaded race gas to get me to an e85 station and then went draggin' Turned out to be a boost leak on the TMIC connections. It's an ongoing thing, I think I'll change out my connectors to the ones I was saving for the FMIC. Nothing has changed yet, still tuning under boost (I don't boost that often and don't want to take too much out at once) and will try dumping more fuel in at startup. It's set to factory timing for startup. Still haven't located any parts.