General target for e85 is roughly 11.8 afr on a gasoline WB setting which gives a good safety variance in weather conditions when AFR swings around due to density of air changing and so forth.

I haven't seen any power gains from 11.5 to 12.5 on my personal car on its old setup. Some cars do see gains though. it depends on the parts, the actual accuracy of the sensor itself, and other things. when tuning someone else's car you have to be on the safe side. For all i know his 11.5 on his wideband could be 12.5 in reality inside cyl #1.

he said that because its his car.

I ran 12.8 for 2 winters straight on my personal evo. You can do a lot with E85 and not have issues. I would personally recommend you stay around 11.8ish AFR though.

I agree. It would have been a lot better to do it part by part instead of throwing them all together and guessing which part is responsible for the gains.

Off the top of my head Id say 20WHP difference between a R2 and S3 uptop. DSport i believe did a cam test and compared the R2 and the rest of the GSC cams so that might be good information for you to look up.

I have S3's in my personal car.



Yep and 2.4's. More displacement the better if you can keep the car on the road.

you need torque. lots of it

 

I could stay around 11.8 but then wheres the fun in that
For a car that will only see one tune, I could understand, accommodating for the various weather conditions. Needless to say my laptop rides more in my passenger seat then any passenger will ever see. One of the reasons I run those afr's.

Have you ever heard of anyone hurting thier engine due to being lean on E-85?

 

Yes you're fine in the 12's.

Yes if you go really lean your EGT will shoot through the roof and you will heat things up so much that they will never return back to normal strength then eventually something will fail on you.

I had a inconsistent pressure switch failure in my old 2.3L setup at around 20K miles on the engine, and all it took was about 15-20 pulls in the 15~ AFR on wideband and it broke a wristpin. It was probably much leaner then that in some of the cyl's though. What sucked is, sometimes it worked, and sometimes it didn't, so troubleshooting it was hard at the time. One single walbro 255 will provide just enough fuel to cause severe issues when you really need that 2nd one to kick on and it fails to do so.

I have only had 2 other customers see pressure switch failures out of hundreds so its a rare occurrence but it can happen. We fortunately caught it before having a failure. If you don't do what i did chances are you can get away with it a few times. I had the mentality that my engine was bulletproof so i did things i shouldn't have. I never had a failure before like that so i was ignorant per say to what the engine could take and not take as far as abuse goes. Now im way more cautious with what i do with my car.

Main culprits with fueling issues usually are caused by running injectors out to far to their max injector duty cycle limits, or a fuel pump not providing the rail with good rail pressure. Even when the wideband shows ok, sometimes in some cyl's its not ok. Keep an eye on your IDC and make sure you are safe if you want to run it out in the 12's like that.