I'd go with the 93 then I like E in my fuel

 

so it doesn't run too hot? obviously when I boost it, I'll get it tuned for 91 ethanol free

 

E runs colder it's way better for boosted when running E47

 

but what about putting in spark plugs that are a step colder? Most efficient combustion with lower heat.

 

on what fuel? If you add boost you should try a step colder because there will be more heat in the combustion chamber but you may get away with the stock plugs on e47+

I'm not a 2.2 expert so someone else should chime in here. I'm running meth on 28psi on my LNF with stock plugs just gapped down

 

91 ethanol free with colder plugs with a supercharger on it. It would pretty much be the same as lsj. Plus, supercharger is constant boost opposed to turbo so you would want to run a step colder?

 

I'd run 93 supercharged with a tune you'll get more from it

Boost equals more air in cylinder so more fuel so hotter so either way turbo or supercharger it'll be the same outcome

 

more fuel would depend on the tune . I thought it was just the octane level?

 

Sorry that last post was unclear. Wouldn't it not matter the octane level?

 

Yes boost is adding more air and fuel into the cylinder which creates heat and detonation higher octane fuel get rid of detonation

 

boost is air and the injectors put in the gas creating the fuel and it would just matter on the psi you have and your injectors, fuel pump and tune

 

Boost = compressed air
Compressed air = hot
more psi = hotter air
hotter air needs colder plugs and higher octane fuel to reduce detonation.
detonation happens when the air in the cylinder gets too hot and self ignites.

 

and then a good heat exchanger right?

 

Yea you need that to keep the Intake air temps down.

 

that's what I thought. I have a good idea of how that works due to when I was young, the best upgrade I could do to my dirt bike was gas and exhaust.

 

I guess the main question is, can I run 93 octane. Haven't had a sure yes or no.

 

I think you can but there isn't much of a point to it. Try it and find out lol.

 

I think I will.

 

That is the idle of ethanol free 90 octane on my Balt, w/o the PnP throttle body. (Racetrac has the 91, it doesn't matter though)

 

Btw the coolant level dropped. My car used to sit around 190-193 but now its from 185-187. Would the fuel be a factor? It's also a lower octane level than before and I know it's at normal operating temp. It hits 189 sometimes too now but not for too long before it drops back to the 185-187 range.

 

Don't worry about coolant levels and such unless they are really high. Mine used to run between 190 and 205 without the blower but now it can get up to around 215. Fuel shouldn't affect it

 

You're probably making this a bigger deal than it needs to be. Gasoline is gasoline. With higher octane you generally keep the same stoich, but can get away with more timing or boost. What really matters is when you switch to ethanol, which would be running lean as **** if you didn't change the stoich in your tune. Running 93 will do nothing more than allow your main spark tables to shift closer to the high octane and farther from low octane table.

 

Yes you can but you have a stock tune so there is no point. when boosted run 93 you will make more hp

 

yeah I am probably making a bigger deal out of this than I need to but I just don't wanna mess up my car and this website has a lot of people with a lot of knowledge.

 

This thread...is why I miss being a regular. Entertainment before bed.