curtisad

iTrader: (4)

I want to run 112 octane at the track, but run 93 octane on regular days. Can this be done if I don't jump on it when I am running 93? This is a 85% track car

HCI2000SS

iTrader: (2)

So you want it tuned for 112, but not on 93?

curtisad

iTrader: (4)

I want it tuned at wide open throttle for 112. If I do that can I still run on 93 if I don't stomp on it?

QTR FMS

if 93 doesnt contain ethanol i think you can get away with at,
93 stoich is 14.63 and 112 is 15 so about 3% leaner but if it has ethanol it would be 14.1 which is 7% leaner,

either way you would need to run closed loop, i think some ecu add more fuel on power enrichment with high long fuel trim,
you would need to setup your low octane table for 93 and high octane for 112 and adjust the bias learning table to use 112 most of the time,

im not sure if this would work the main issue is if you are on track and the ecu uses the low octane table and you lose alot of power or when you fill 93 and it uses high octane table and it knocks and maybe your knock sensor is desensitized and doesnt hear the knock you could damage your engine,
its gonna be eaiser if you have hptuner with you and switch tunes everytime you change fuel,

or just use race e85 with flexfuel sensor would save you lot of trouble

LSX Power Tuning

iTrader: (4)

If you dont have the compression for 112 it will make more power on 93.

gametech

iTrader: (1)

You would be totally wasting your money on 112. You will see no benefit, other than the weight reduction from your wallet.

curtisad

iTrader: (4)

I have .5 over stock compression. I had my heads fly cut a while back and that's what he said.

98CayenneT/A

What motor?
Is this the setup in your sig?
So you're at 10.5 : 1 cr ?

brandon6.0

iTrader: (32)

If anything i would run a splash of 112 mixed with 93.

Like said, if u dont have the correct compression ratio/need for race gas its useless.

G Atsma

Good anti-knock insurance policy...

98CayenneT/A

Maybe..... he has not posted his cr, motor, what he is trying to do or reasoning (nitrous ect.)

pdxmotorhead

Race 93 or 104 until your closing in on 14:1...

If you go pump 92/3(which will have some ethanol) ,, and switch to race 93 or 104 at the track, your close enough to be safer, saving a ton of money and not having to dink around is worth something to me... YMMV You can also help by running your rev limiter lower on the street, especially if its a add-on that has a dial or a pill..

I worked a bit with Sunoco and got to talk to a lot of chemists that do fuel, they all agreed that mixing street gas is bad enough, mixing race fuels is a crap shoot ,, you have to know the exact chemical mix to make sure they are additive and not subtracting octane. the additive packages change dynamically on almost every fuel run depending on the chemical packages cost , its sold like crude oil ,, the various Oxygenation chemicals that is. Mixing race and street fuel is even worse..

curtisad

iTrader: (4)

currently I am running a 50 shot of NO2 when I'm at the track. If I added 112 octane would it be safe to run a 100 shot without pulling timing?

LSX Power Tuning

iTrader: (4)

Instead of trying to mix fuels which will be very inconsistent unless our going to drain your tank and mix and re-fill with the new mix it will be much safer to pull the correct amount of timing which on a 50 shot wont be very much. Your factory O2 sensors will not like leaded race gas either.

98CayenneT/A

why not run a stand alone fuel cell?

HCI2000SS

iTrader: (2)

Let's back up a few steps here first. First of all do you know if your setup is octane limited? In other words does your car make more power with more timing that 93 octane can't support?

gametech

iTrader: (1)

Get the **** out of here with your logic and reason. Seriously, though, a disturbing number of people have no idea as to the true answers to the questions you just posed. They just assume more timing equals more power when it may not be the case. They follow that assumption to the idea that more octane rating plus more timing equals superhero power, when it may actually have no benefit.

HCI2000SS

iTrader: (2)

I know I know, damn logic takes all the fun out lol. I totally agree with that, which is why I asked the OP that question. I was willing to bet on the fact that he had no clue, which would validate my point.

curtisad

iTrader: (4)

You are right. I don't know if I am octane limited. I just want to run a 100 shot at the track without taking it to my tuner and have him retard the timing for the NO2. I figured that adding 112 octane wouldn't hurt with an N/A run and would allow me to also run a 100 shot with no problems. That is what I am asking?

LSX Power Tuning

iTrader: (4)

You would have to ask your tuner. Without knowing what your timing is at now, seeing data logs or plug pics no way to know if 100 oct would work or not vs pulling timing,