Quote:
Originally Posted by dj2020
I'm thinking of doing this soon and Shawn Church says it's no problem for him doing a 91/e85 flex fuel tune. I'll probably run e85 full time but he says he can make it safe when on 91 for road trips.
He also said something interesting that I never thought of, which is to add a wastegate to the intake tube to limit your boost to 9psi on the HBP. That would be another way of making the HBP safer for 91 octane. I did some research and it looks like a lot of domestic muscle cars on centrifugal SCs will run a higher boost pulley but limit the actual boost at the top end with a wastegate. That way you'll have higher boost levels at a lower rpm. Just thought I'd share and have a discussion.
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Yeah, we have done this on different applications. There are additional components, cost, and complication associated with it. But yes, it works.
If you are planning to run E85 most of the time, it really would never be used. Also, guys are running around with 91/E85 flexfuel without the wastage system. We don't recommend using 91 octane with the high boost pulley because the benefit of the additional boost is taken away by the amount of timing you need to pull out.