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How much boost on 91 octane?

Imp2Dom

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I would like to know this as well. Is a reliable and safe 700 RWHP possible on 91 octane?
 

Barrel

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I think closer to 600rwhp is "safe" for 91.
 

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Glenn G

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Depends on the tune
Depends on alot more than the tune, intake temps being the most important, compression ratios (11 on a stock coyote) altitude, type of forced induction to name a few.
 

beefcake

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depends on the tune, fuel quality, etc.. I have seen some 91 that was better than some 93 and some not as good as some 89

with the 15, I think 600 or so, personally for a customer car is where I would like to see it kept at, doesn't mean you can't make more

simply means for longevity, these engines are still so new
 

rio16

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sucks being in Cali... only 91 or 100/101 octane
 

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Chummel

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beefcake

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What are the downsides to e85? Only have 91 octane available but there are a couple e85 pumps in town.
less mileage, but cost is lower so it balances out

less mileage even more, because your foot will be in it a lot more with the newfound power
 

Chummel

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less mileage, but cost is lower so it balances out

less mileage even more, because your foot will be in it a lot more with the newfound power
Sounds like a good option down the road. I don't think the stock clutch or half shafts will like that too much.
 

Mike@KenneBell

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That so far is the only downside I have seen. I have been on E85 for about 3 years now. I was paranoid about making the change worried about finding it. So I set my car up with 2 tunes-one with 91 and the bypass locked open and the other E85 and 20psi. I did make sure all my fuel line was E85 compliant and I haven't had an issue yet. There are a lot of E85 stations around me that I never knew about until I started using it. I run around with 740RWHP. Stock heads and cams.
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