aug181983

iTrader: (3)

so my tuner says i need to run 100 octane so i was wondering if i can run 93 and mix some 108 octane in with it. Plus i really dont want people to know that im running Candy Gas cause then they wont want to race i street race at a spot that is alittle over 1/4 so i built my motor for track you can say.

chavez885

iTrader: (12)

Why do you need 100 octane? What are you running exactly?

aug181983

iTrader: (3)

383 13.1 my tuner said 100 octane

ss.slp.ls1

iTrader: (36)

What's the point of mixing 108 octane with 93 instead of just using 100 octane?

Puck

iTrader: (17)

What dynamic cr? What cam?

13.1:1 static CR with a big duration cam and lots of overlap can lower the dynamic CR enough to run 93 pump gas.

One of the benefits of reverse cooling.

LM97Z

iTrader: (4)

+1 You need to calculate Dynamic compression.

SPEEDYTRANSAM1996

iTrader: (37)

how bout them bottles of octane

aug181983

iTrader: (3)

i havent got a cam yet but ill be going threw AI for that, ill mention to him that id like to run 93 so well see what he says. Now the reason i said mixing the 2 cause it can save me some coin cause that octane is about 6.50-7.00bucks.

RamAir95TA

iTrader: (2)

Octane booster only raises your octane by tenths of a point - not full points.

SPEEDYTRANSAM1996

iTrader: (37)

thats what my brother just told me RIGHT NOW....i understand were AUG is coming from cause that **** is pricey. I remember someone putting 60 octane/40 93 and there car ran ....

z_speedfreak

iTrader: (3)

toluene, just make sure you mix it right.

My95Z

iTrader: (8)

Thought it killed fuel pump/lines?

myltwon

iTrader: (1)

as long as you mix toulene right it can be an awesome additive but you have to be careful

My95Z

iTrader: (8)

Cool, nice to know. Looked into it b/f and seemed like it would do more damage then good, I'll have to give it another look.

aug181983

iTrader: (3)

even that tolulene is expensive now a days to mix the right blend of that and the other gas you might as well just buy the 100 octane

RamAir95TA

iTrader: (2)

Build a motor with less compression?

SPEEDYTRANSAM1996

iTrader: (37)

^^^^^lolol there you go

James Montigny

iTrader: (13)

Sad, but true.
You want to be in around 11.1 - 11.4 to maximize cam selection in an N/A car running on pump gas.
Otherwise, you have to run race fuel or pull timing.

Common mistake

Puck

iTrader: (17)

Still depends on the combo...personally I think it is a much more common mistake for people to rebuild with too low compression instead of too high. How many 10:1 383 LT1s are there running around built by guys stuck in the SBC train of thought and scared to go higher? I would aim for 12:1-12.5:1 for NA use assuming you are running a cam with a lot of overlap...which you should be if you did your homework before building a high compression NA engine anyway. Any tuner worth their pay can tune a healthy cammed 12.1 LT1 on 93 octane.

If its just a street car and will be running a small cam that keeps the dynamic CR too high then 11.1-11.4:1 like you mention would be a safer bet

LM97Z

iTrader: (4)

I would listen to this guy, he makes a very good point. No reason to be scared of alittle more compression, gives you room for more overlap/dur., & if its matched right with the rest of the combo, it'll only run better & stronger.