M Engineering

Costco gas is generally a gas associated with higher knock than other brands. If you were to fill up with that gas, a quick datalog and analysis could tell you how much knocking is going on and you could compare this to other fill-ups. Another cool thing about our product!
Try each gas and log each one, the empirical data will let you know which is better, and we are happy to review logs for free from our software.

-Charles@M

mattchow

interesting, I didn't even think about gas brands being better than another, would it be that much of a noticeable difference between brands?

22CarreraS

Costco gas comes out of the same hose at the distribution point as shell and Exxon gas. The only difference between brands is additives added into the tanker for the specific station it’s going to. Walmart, a lot of grocery store brands etc have no additives. Exxon has a different additives package than Shell. The gas is all the same.

TheGooch

Great shop!!

DButcher

How realistic / safe is it to frequently switch between E85 and 93? I live where both E85 and 93 are readily available but often travel with the car to places that E85 is not (rural Tennessee, etc).

M Engineering

Switching between the different fuels is fine to do as many times as you like. Since these cars don't have active flex fuel, you do need to make sure you are letting the tank get low so that when you switch tunes you haven't diluted things too much. For example, you wouldn't want to fill up on e85 if you have a 1/4 tank of 93 left in the car. Your e85 would be diluted to like an e50 or something and would not be compatible with the tune (that being said, we can make tunes for blends as well. For the 992 Turbo we have an E30 tune since the HPFP can't support full E85 on that car).

Different gas brands most certainly can make a difference and is noticeable in datalogs looking at knock events. When we have clients with excessive knock in their logs we sometimes recommend trying another brand or station and that sometimes does the trick if the gas was in fact the issue. The gas comes down to age, ethanol content, additives, etc. There are lots of variables going on.

-Charles@M

DButcher

Awesome, thanks! Loving the 93 tune so far but with E85 so readily available here in Ohio I’m willing to give it a shot. Never used it on any of my cars before so very curious (and ignorant) lol.

AlterZgo

Can our cars run E85 indefinitely for years? Or would you recommend running a tank of normal gas through car every few months or a couple of times a year? Still contemplating whether to switch from 91 octane Stage 1 to E85.

Also, should we change spark plugs to a colder plug or gap them differently to optimize E85 running?

M Engineering

We always recommend running stock plugs gapped to .022 as this works best for prevent spark blow out.

We haven't seen any issues arise yet on cars running e85 for long periods of time. That said, it's not good for ethanol to sit for long periods of time, so if you don't drive your car often I wouldn't leave it sitting with e85 in it. E85 is meant to be driven on.

-Charles@M

LifesAnesthesia

So what all do we need to do to our cars to be eligible for stage 2?

M Engineering

Stage 2 is upgraded link pipes.

Here are the official map notes: https://m-engineering.atlassian.net/...ibration+Notes

-Charles@M

AlterZgo

So it says exhaust for stage 2. Does this include cat back exhaust only with stock cats? Or does stage 2 work well with high flow cats on stock exhaust? Or do you recommend an actual cat-bypass link pipe to run Stage 2?

M Engineering

A catback is still Stage 1.

Sorry, I realize those map notes are a bit vague but our official wording needs to be.

Stage 2 would be upgraded link pipes. This would be upgraded high flow cats or better.

-Charles@M

dixonk

Just installed my Soul Sport Cats and the stage 2 tune. Very nice improvement. I haven’t tried out a launch on it yet but I was able to increase acceleration by .10 g. Had to run a couple different versions to get rid of a pesky CEL but Scott got it taken care of.

shrimp money

I really want a Stage 1 tune for Christmas this year. Mainly so I can open my exhaust valves 100% all the time.