Quote:
Originally Posted by Jackson Racing
This is all dependent on how your tuning is setup with your tuner. A lot of guys are doing 91/E85 flexfuel. So yes, in that case you can run the high boost pulley on 91... If your tuner has setup the tuning for it.
I would not blanket trust all tuners to put in the necessary safety that allows a 93+ octane tune to be ran on 91. I also don't trust myself to not go WOT. 
In the end, the way your custom tuning setup is between you and your tuner. The safety of the high boost pulley on your car is in your tuner's hands. |
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.