R61 Anyone Run Mid-Grade Fuel?
#4
concur that you read up and decide for yourself
I'd suggest beginning with figuring out what "octane" means. Hint, there is a connection between 'compression' and octane. A turbo's purpose is to increase compression.
short answer is today's engines are smart enuf to sense what octane you have put in and adjust the fuel/air/ignition so you won't damage anything (up to a point). If you use a lower octane than what's recommended you will loose a little power ... and for the most part if you run higher you just waste money
My current daily driver is also a 2 liter 4 cyl turbo and in the owner's manual they give chart of the HP and torq' for various commonly available fuels .... top to bottom is only a couple of HP . . .
I recently posted this link: https://grassrootsmotorsports.com/articles/fuel-truth/
*******
btw .. my 79 calls for 93 octane or better. I once filled with 89 .... this car does not have computers to adjust automatically. I have NEVER NEVER made that mistake again! It would hardly hold an idle, kicked and bucked under load - aka 'pre-ignition knock - and would run after the ignition was turned off (- also pre-ignition ... "dieseling")
I'd suggest beginning with figuring out what "octane" means. Hint, there is a connection between 'compression' and octane. A turbo's purpose is to increase compression.
short answer is today's engines are smart enuf to sense what octane you have put in and adjust the fuel/air/ignition so you won't damage anything (up to a point). If you use a lower octane than what's recommended you will loose a little power ... and for the most part if you run higher you just waste money
My current daily driver is also a 2 liter 4 cyl turbo and in the owner's manual they give chart of the HP and torq' for various commonly available fuels .... top to bottom is only a couple of HP . . .
I recently posted this link: https://grassrootsmotorsports.com/articles/fuel-truth/
*******
btw .. my 79 calls for 93 octane or better. I once filled with 89 .... this car does not have computers to adjust automatically. I have NEVER NEVER made that mistake again! It would hardly hold an idle, kicked and bucked under load - aka 'pre-ignition knock - and would run after the ignition was turned off (- also pre-ignition ... "dieseling")
Last edited by Capt_bj; 04-10-2016 at 01:56 PM.
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