Switching from E-85

[mmdohc281]

I have a 4.6 2V with 11 to 1 compression on E-85. Can't get E -85 in western Washington anymore. What can I do to get it to run on Premium? I appreciate all the knowledge here.

[Turbov6Bryan]

You will need a new tune for 91 octane.
Hopefully no knock or ping with pump gas, might have to use torco fuel octane booster since you have a bunch of compression

[Blown3.8]

Put some thicker head gaskets on it, install meth injection. But I think you should be able to get it to run on premium with just a tune. Do you have aftermarket cams in it?

[mm svt]

11:1 still not terrible your tune just won’t have as much timing with 91

[Mackdombles]

I am at 10.5 to 1 with a blower running 13lbs of boost. 11-1 won't be a problem A tuner will be all you need as if you have the fuel components to run e85, the you have the equipment to run any octane available at most pumps.

[mmdohc281]

Not sure of the cams, but has 32 lb injectors. Will those need to be changed?

[Turbov6Bryan]

Not sure of the cams, but has 32 lb injectors. Will those need to be changed?

Find a good tuner and you can run any size injectors you want, drivability with 210lbers off idle might stumble a bit... but 32lbers your tuner should not have to worry about those little guys

[Blown3.8]

Injectors are fine.