thought i'd treat my g5 right this week and put 93 in her (not tuned for it, actually not tuned at all). dear god wtf!! thing hauls ass like it never has before. does this make any sense? ive been tempted to put only a 1/4 tank of e85 to see how it performs, but thought i'd get some insight before I go that far.

 

Dear god do not put e85 in your tank. I'm sure some of it is placebo effect, but running midgrade or premium can help since they generally have a high detergent content

 

Don't do E85 haha

But yeah, 93 should help clean some **** out, but it's just a waste of money on that engine

 

It's not a waste of money if tuned for

 

Only worth it if tuned for. Stock it's not tuned to take advantage of premium.

 

He said he wasn't tuned for it

 

I was saying that towards itoastie

 

There's a high and low octane table stock. It makes a difference just maybe not as significantly as a tuned car. I added 2-3 degrees of timing on my tables via HPT. I have full bolt ons but not everyone does. The extra timing really makes a difference when paired with:

Disabling the throttle opening delay
Setting PE delay to 0 RPM
Increased trans pressures so it doesn't make ricer shifts anymore

 

the OP doesnt. high test is tossing money down the drain. low test makes more power than high test on that engine with a stock tune

 

I only run 93 but at least I'm tuned for it.

 

Now that you mention it I put 91 in my stock untuned once and it ran like **** LOL. But that was at a shady gas place in the ghetto part of town. It was probably half water haha

I can't find 93 anywhere but I found 92 at a heavily used Sinclair. I want to find 93 so bad...

 

Chevron's up here have 94

 

It's in your head.

 

On a stock tune there is usually some part throttle knock for gas milage reasons, probably got rid of that. Would result in gains at low and medium loads.

 

im running 93 right now, but that's bc all the stations around here have/are switching to the lovely winter blend and I get a little bit better mileage per tank then i would on 87. but the rest of the year I run 87-89, and put 93 with cleaner every once in a while to clean everything out.


Posted from Cobaltss.net App for Android

 

Maybe added a degree of two of advance? Not sure. Reset the PCM with a full tank of premium and see how it runs

 

All cars are built to handle just about every octane of fuel available...though I commonly see 87, 89, and 93. Idk about 94 or 100 I think you need a tune to run those effectively but I've run 100 in my car before with no issues but I don't do it very often...the price alone is enough to keep me away.

You can run 93 without a tune and supposedly it helps clean the engine, though I don't know if that's just a myth. You can just use an additive if you want to clean the fuel system.

Definitely do not run E85 in your car unless your engine was specifically designed for it. I think E85 cars have a placard on the gas cap. If you try running E85 through a normal engine you're going to destroy it. I've even heard of these flex fuel cars having problems with seals going bad when using E85.

 

cant these n/a engines hit max brake torque on 87 octane anyways? if so, running over that is pointless even if you are tuned

 

More octane more timing

 

Partially in your head, partially the cold spell actually making more power...

 

right, if you continue adding timing past mbt youll lose power. im asking if its possible to hit mbt on 87 on these naturally aspirated cars. if so, anything past 87 is a waste

 

OP said GT=LE5/2.4L
Factory recommended fuel 91 octane.

 

depends on the year, 2008 or 2009 they put the 2.2 in the GTs and sports.


Posted from Cobaltss.net App for Android

 

try this thread if you like

Lower octane = more power, higher mileage? | Mercedes-Benz Club of America

 

I put 93 in my car for the first time this week. Runs about the same. Got it for 3.10 though lol