Having some trouble with my 2015 s550 (tuning)

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Dec 21, 2023 | 07:37 PM

Bigant32312

Thread Starter

Joined: Jul 2023

Posts: 3

From: Georgia

Having some trouble with my 2015 s550 (tuning)

Hi I recently bought a 15 s550 and can’t figure out if it has a tune on it or not ( I believe it has a e85 tune) . It has a lot of upgrades (cold air intake, catch can, lowering springs and paddle assist). It did not come with a tuner. I’m just wanting to know if there’s any device I can buy just so I can see what gas I should put in it, I am not trying to get a new tune if it already has one. It goes over 7,000 rpm that’s why I think it has one. Or should I just get a new tune?

I also asked a dragster and he said to put 10 gal 97 and 5 gal of 85 and see how it drives. Not sure if I should do that though.

Dec 22, 2023 | 12:39 PM

Derf00

Gentleman's Relish

Joined: Feb 2005

Posts: 13,189

From: AZ

Two ways to handle it...go to a dealer and see if they can tell you. Go to a dyno shop and have them tune the car to what your preferred fuel grade is and be done with it. 87, 89, 91, or 93 octane.