Adding race gas..opinions

[RON]

Here in Ca it's 91. Has anyone with SC added race fuel (101) say 2-3 Gal per tank for DAILY driving (in case I want to have a quick shoot out at the stop light). I calculated that 2 1/2 Gal added to 91 fill up should render around 93.

Thanks
Ron

[Dawgz]

Here in Ca it's 91. Has anyone with SC added race fuel (101) say 2-3 Gal per tank for DAILY driving (in case I want to have a quick shoot out at the stop light). I calculated that 2 1/2 Gal added to 91 fill up should render around 93.

Thanks
Ron

Im pretty sure if ur tuned with 91 octane gas, a big jump like 101 octane would require u to have a tune to run it safely/efficiently.

And as for 93 octane by mixing diffrent levels of 101 and 91, i dont know how you would be able to calculate it on the fly like that.

[trd4life]

Ron most guys run a methanol kit that activates at a set boost level or my MAF voltage , much much cheaper in the long run. But yes i have added a Xylene (117 octane) to my camry and solaras at the race track on hot days to prevent detonation.

[jetbtkng]

i filled my lara up with 101, 8 bucks a gallon, about $160, ran like the wind but alot of mony, so i just put a meth inj kit on, way cheaper by far.............

[RON]

And as for 93 octane by mixing diffrent levels of 101 and 91, i dont know how you would be able to calculate it on the fly like that.

I was looking at a calculator chart on line. Actually, I found a place near by that has 100 race unleaded. According to the chart, if I mix 5 gal of that with 13 of 91 ( I assume tank holds 18 gal?) an I should get 93. That's for EVERY DAY driving..not on a race track or drag strip. I just want added knock resistance for a *street race* here and there. Since I fill up 2X a month, that should only add about $50 a month in gas cost.

[1gSE]

so i just put a meth inj kit on, way cheaper by far.............

meth injection kits go for about 300 bux, add in a bottle of windshield washer fluid every so often and it works out better

[RON]

meth injection kits go for about 300 bux, add in a bottle of windshield washer fluid every so often and it works out better

What kits are they using here....any tutorials or threads?

Thanks

Ron

[trd4life]

i'm using snow performanc stage 2 with the 175 nozzle activating at 4psi ( i am hitting 7.3 psi with the 7psi pulley)

[RON]

i'm using snow performanc stage 2 with the 175 nozzle activating at 4psi ( i am hitting 7.3 psi with the 7psi pulley)

Are using BOOST imput or MAF? If MAF, what voltage did you settle on.

Thanks

Ron

[trd4life]

Boost input

I wasnt sure what to set the voltage at for the maf setting, i'm using a much larger Supra TT MAF sensor which operates on a lower voltage scale. For now i am running on boost activation currently but may switch over to MAF activation after i get a chance to monitor the TT sensor scale.

[RON]

Do a search on Google>>>

*93 octane supercharged*

Interesting.

[RON]

From Kenne Bell (The KING of supercharging)...

Typically it takes about 1.5 octane per pound of boost over a certain level to run safely without knock, but there are quite a few variables like temperature, load, air/fuel ratio and total spark advance that REALLY affect the required octane level, so to "pin a number on it" is difficult to do.

Here's our basic recommendation: "Always go with the highest octane you can get over what everyone else recommends to be safe". I know that is vague, but again, there is NO PROTECTION for these engines other than YOU and OCTANE.


According to that rule, going from 4Lbs (*safe level*) to 5.5Lbs gives you 92.5 min Octane (call it 93).

[RON]

From the Magnuson Site ( Makers of Eaton SC that we have)>>>

The deciding factor when building a blower motor is to decide how much boost you plan on running, and what type of gas you will use. Compression tolerance (the amount of compression gas will take before detonation) of 91-octane is 13.5:1.

The EFFECTIVE CR (static corrected for boost) of our car at 4lbs boost is 13.3. This was taken from a CR calculator on the web, given a static (stock) of 10.5 and 4lbs boost at sea level. It's no coincidence that TRD went with the 4lb pulley. OK..back to the 5.5 lbs.....the EFFECTIVE CR is >>>14.4 (1 bar)....6lbs is 14.8 and 7lbs is 15.5. Again...drive with 91 octane using a 5.5lb and over at your own risk. Sure...add fuel mods and tune....use a stonger knock sensor...call it ambient *noise* from the SC causing the *problem*. I'm convinced the underlying fundamental problem with added boost in this instance is LACK of octane to support it. I'm not saying *93* is the answer....but it goes a LONG WAY in solving the detonation delima for daily drivers on added boost (me). I'm going to be the *guinea pig* now....maintaining 93 in the car. Let's see if I can make it through summer without blowing a sensor.

[panic]

The EFFECTIVE CR (static corrected for boost) of our car at 4lbs boost is 13.3

Are they still posting this?
That "calculator" is simply adding boost to atmospheric pressure, and multiplying the result by static CR.
Doesn't work like that. The actual math, where
ECR: effective CR
B: boost
A: atmospheric pressure

ECR = CR × ((B + A) ÷ A)^.74074

ECR with 4 psi and 10.5 CR is 12.55:1

Read my article: http://victorylibrary.com/mopar/blower-engine5.htm#ECR

[TMMK Toy]

Or you could just move out east and buy 93 at the pump