meth with 89 or below octane?

[vacuum 6]

Anyone running this?

 

[vacuum 6]

Really?!? No one is running 89 octane and alky?

 

[TurboBuRick]

I would like try it myself. Seeing how the alky turns on at 5 psi, you would think that it would work fine.

 

[vacuum 6]

I would think the need for two nozzles would come sooner. Plus more HP on lower octane?

 

[TurboBuRick]

Alright, you try it first. :biggrin:

 

[vacuum 6]

No 411 from Julio?

 

[Razor]

Should work. Worse case is you use more alky

 

[vacuum 6]

Should work. Worse case is you use more alky

Yeah that what I was thinking. What about lower octane = more HP?

 

[Razor]

Yeah that what I was thinking. What about lower octane = more HP?

Dont knw.. to me its not worth the savings going from 93 to 87. 20 cents per gallon on a fillup is 3.00. taking away that extra layer of protection from the higher octane gas.. could cost a whole lot more.

 

[vacuum 6]

Dont knw.. to me its not worth the savings going from 93 to 87. 20 cents per gallon on a fillup is 3.00. taking away that extra layer of protection from the higher octane gas.. could cost a whole lot more.

Agree regarding the cost differance. I'm just wondering if anyone is doing it (using 89 or lower with alky).

I guess some would say the same thing with alky/93 vs race gas but whatever I'm an alky.

 

[SIXBANGR]

been doing it for the past 3 years. Not by choice, 89 is all I can get unless I drive 37 miles to a bigger town , then I can get 91.

 

[gusszgs]

I tried it! Don't bother......waste of time.
When this thread first appeared I thought "what the hey" why not try 89 and see. Ended up getting ALL kinds of KR.......was a joke, even under 5-6 psi I was getting anywhere for 3*to 7*KR.
Brought the car home and dumped the fuel out and put it in my wife's minivan and my Century. Yes, I tried turning up the gain knob, no difference.
So, it was straight over to Sunoco for a fresh load of 94...........0 KR :biggrin:

I will point out, I did have my overall timing up from the default of 128 to 137.....so there was a few more degrees of timing in there. Went back to default and was still getting KR, just not as bad. Didn't even want to drive the car!

 

["Turbo-T"]

So I guess the verdict is in....89 just ain't gonna cut it. I can only wonder how those in areas w/o 91 cope.

 

[aminga]

Dont knw.. to me its not worth the savings going from 93 to 87. 20 cents per gallon on a fillup is 3.00. taking away that extra layer of protection from the higher octane gas.. could cost a whole lot more.

So I was thinking about adding a kit to the wife's DD (03 GTP) so she could run 87 Octane.

 

[Roc87]

91 octane isn't too bad, wish we could get 94 here. It's either 91 or 100 for about $7 a gallon

 

[BlackBandit]

Yeah that what I was thinking. What about lower octane = more HP?

Lower octane=easier to detonate NOT more HP.

 

[Razor]

The lower the octane, the easier it is for a fuel to burn.

Putting 116 octane where 87 is needed cuases the engine to run terrible. As high octane fuel requires a lot of timing to burn.

If the question is which "can" make more power.. the 116 wins. Vs which makes more power the 87 wins.

 

[BlackBandit]

Basically octane is just a measure of how much energy the fuel can absorb before igniting. Some of the higher octane fuels actually release more energy when burned than the low octane fuels which means they can absorb more energy AND make more power.

 

[turbo nasty]

Good thread.. Octane rating in jist is its tolerance for cylinder psi's and timing and boost raises that.

 

[Razor]

Basically octane is just a measure of how much energy the fuel can absorb before igniting. Some of the higher octane fuels actually release more energy when burned than the low octane fuels which means they can absorb more energy AND make more power.

Wouldnt a setup optimized for low octane run poorly with higher octane? Additives would be I guess a whole other issue. Just thinking out loud.

My own experience with race gas has been lots of timing and lots of boost. If not the motor wouldnt run correctly. On pump fuel the only downside is knock. But the idle, drivability, etc have always been better with the lower octane gas.

I personally have never dyno'd on 87, then dyno'd with 110+ under same conditions. Keeping timing the same. So I dont know. I do know street settings the higher octane fuel wasnt welcome.

BlackBandit, Good points