do you need to run premium gas with super charger or not?

Man y'all ask the dumbest things. If they recommend 91 you better run 91.

 

Troll in training
https://www.tacomaworld.com/threads/tw-official-bs-thread.397428/

 

I don't have a supercharger or a 3.4 so I can't say for sure really, but the minor difference in cost to me just seems like a no brainer really. I know my turbo Volvo runs like dog shit on 87 and pings really bad. But on 93 it will happily boost to 22 psi all day long. Granted the supercharger is a lot less boost, but regardless I'd personally run the 91, the peace of mine to me would be worth the extra 20 cents a gallon.

 

Wut?

 

Lmfao you'll never understand if your not troll material

 

Just remember that SC's really hate heat & behave badly if atmospheric temps are too hot/too dry

 

Cause I'm not.

 

you're right. i guess i should have mentioned i was referring to stock/unmodified vehicles. I guess I didn't mention it because in my original post i mentioned that an upgraded fuel delivery system was needed. or did I? i don't remember that far back

knock is strictly an issue involving motors with higher compression ratios. from what I understand, at said higher compression ratios, the fuel can actually ignite just from the hot cylinder/chamber walls and not by the ignition spark.

kinda the idea behind diesel fuel and glow plugs. if i recall correctly, you cannot ignite diesel fuel by spark. therefore you use a glow plug. glow plugs stay at a certain hot temperature until the diesel fuel mix is ready to be ignited. then it's given a little more juice and heated to the point where the fuel mix will ignite at the designated compression ratio.

 

Didn't think that one through

 

Life was easier naturally aspirated...but it's more fun now!! Haha

 

TRD recommending premium fuel isn't a surprise necessarily, but what I don't understand is why the existing knock sensor(s) don't simply make the ECU retard timing when that happens.

Then again, thefatkid's description on p.1 makes it sound as if that's exactly what happens on cheap gas, so, why would it still ping?

 

The issue comes from the range when ECU monitors and changes timing based off of knock sensor input. Also the range of correction is very narrow. If you watch scan tool data you can see that while the engine computer can see sensor input from the knock sensor, no timing change occurs.

 

A gas engine does not rely on or want compression ignition. Different engine theory form a diesel engine.

Any compression knock in a gas engine is bad. Pre ignition where maximum combustion pressure occurs before top dead center is bad. Same with detonation, where heat ignites the fuel in another point besides/before the spark ignition, causing a flame front collision. Typically with a supercharged 3.4 the spark plug is starting the ignition too early causing ignition before TDC. The fuel trying to expand before the piston is ready start downward travel creates excessive heat and could burn internals.

 

a zillion years ago people used water injection for a simple, cheap fix for this, didn't they?

 

Yeah people use meth injection shot right i to the intake

 

I tried that too but the pharmacy kept wanting my info.

 

I forgot to add this to the nonsense. Funny it says, "butt hat". I'm guessing this person wears one, cause they are full of shit and clearly reads too many books, but doesn't understand the material.
The last line of this comment clearly show this person knows nothing about having a SC.
Running lean IS a problem with forced induction and improper tuning. Using low grade fuel causes ignition problems and will through timing off and cause fueling changes in the ecu. This could cause running too lean, which is NOT a good thing and could fry the motor.
lack of knowledge about diesels is evident in thinking glow plugs have something to do with combustion in diesel engines. It's compression that cause combustion, has nothing to do with glow plugs.

 

Yup....^^^....

 

ok guys the thing is it knocks, I think that's because its not burning all the gas fast enough if its low octane, I "think".

the last time I compared premium to regular cost of gas it was close to being a wash because premium got a little better gas mileage which offset the extra cost. again I "think" it worked out to about an extra 2-3 cents a gallon by the time it calculated it out. not sure if the SC would change this regular vs premium mpg you get from it vs cost formula.

just trying to understand all the little "oh you need this and that now that you have a SC" stuff.

what about the different fuel pump, larger sized injectors, urd pulley, and 7th injector with black box stuff? is all that stuff only to squeeze out a little extra hp or does it help in any way to get better mpg? or does it make you get worse mpg?

also can anyone tell me the before and after mpg average they get before they SC and now after?