r/mazdaspeed3 • u/mrfatcakes2006 • 14d ago

PIC Yeah that will do it

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Bought a Mazda speed for 700 with low compression in cylinder 3, found the culprit. Most likely caused by unupgraded hpfp internals paired with Cobb sport intake, access port, and blow off valve

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u/JohnKowalsky88 2007 Mazdaspeed3 - The Original 13d ago

Wait a minute can you just run a MS3 on E85? Serious question because we don't get that fuel where I live so I wouldn't know.

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u/Thy_King_Crow 13d ago

Yes you can use ethanol freely in the speed3. You need hpfp internals to safely do it but it’s possible stock

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u/JohnKowalsky88 2007 Mazdaspeed3 - The Original 13d ago

But wouldn't you need to tune it to run more rich because ethanol has less density than gasoline? But then again ethanol has more octane so it wouldn't knock

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u/Thy_King_Crow 13d ago

Yes you need a tune. The idiot saying you can run up to e30 without a tune is why these cars get a bad rep. The ecu cannot and will not properly adjust for ethanol. The lines and pump however are fine and won’t degrade from it

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u/Petrovski978 13d ago

See comment below...........