Just wanted to hear some more input from guys out there that may have tried this.

I'm up in canada. The best 2 options I have are Shell Vpower 91 octane 0% ethanol and Husky 94 octane with 10% ethanol.

I know the Shell will yield better gas milage. But i'm more concerned with power and detonation.

I've read on mayn other forums showing the 94 octane to be able to add more timing than the 91 stuff. But a couple porsche guys swear that 94 octane ethanol stuff is snake oil and the 91 octane shell zero ethanol stuff is better.

I'm running alpha3076 with all the supporting mods.

Thanks in advance!

 

Why dont you put some 94 octane ethanol stuff and log it as you turn the boost up in small steps.

Not saying to get there on this 94 gas unless good timing on logs, but I was able to run over 1.35bar on european 100 pump gas that should be quite the same with your ethanol gas.

 

I researched this not too long ago. 94 all the way for turbos. When I was reading all the threads, I noticed majority of the guys pushing shell 91 were non-turbo Porsches.

 

Select PetroCanada stations in Alberta also sell 94 Octane now, also Ethanol blended. So if you're going 94, there's another option. A buddy with a Supra tells me that it's better than the Husky gas, but I've not tried it yet.

 

HI,I played with almost that same case scenario with my high output motorcycles on the dyno..Was able to pick up more HP with higher octane mix over srtaight gas...Was able to run more timimg..

 

Maybe I'll toss some 94 in and do some logs.

 

Street or track?? Porsches have this uncanny ability of changing their ECU profiles based on the fuel they get. Sitting and drooling here in California where we have the worst fuel in the nation, 91 with 10% crap added to it on a good day ( now threathening to add up to 15%) ... our cars still skoot around pretty well. Wish I had your problem :-)

 

I was able to run more timing, during Dyno testing, with the 94.

 

Here are some logs I did. Shell91 ocatne was done a couple days ago. And over the weekend I burnt off as much gas as I could and filled up with husky 94 octane 10% ethanol blend and did a run.

Both done on the same basetune from my tuner. I sent both to him to see what he thinks also.

 

Max we talked about some of this on the phone but I will add some more here that I think we did not cover.
I tried once before several days ago but I pressed send and the page disappeared.

Alcohol fuel is bad on different levels and so many.
It is dry fuel with poor lubrication properties, you may not think that is a big deal as your engine has oil in it but it is also a solvent that strips away that lubrication. So in the absence of oil and the fuel having poor lubrication properties that dries things out you have a recipe for accelerated engine wear; also store an engine running alcohol fuel for any time and you have potential for stuck valves, rings and such.

Alcohol fuels do not store well as they are hydrophilic; meaning they absorb water.

Alcohol is added for environmental reasons not because it makes a better fuel, Small amounts of alcohol in a fuel adds the appearance of better octane ratings when in fact it is all smoke and mirrors as the constituent elements that would make alcohol enriched fuel better are too costly to add for a company that is just concerned with meeting minimum standards and making a profit.

Alcohol fuel has a lower enthalpy of heat then a regular premium fuel. What that means is per a certain volume it has less energy. To get the same amount of energy you need more of it.

The specific gravity of alcohol enriched fuel changes more with temperature. And living in a country like Canada where 70 degree temp changes during the course of a day are a regular occurrence for many months it is harder to tune an engine for consistent performance.

Alcohol enriched fuels may evaporate easier but they have a lower heat of vaporization, The higher a fuel’s heat of vaporization, the better its ability to cool the intake mixture which is a bonus for making power.

Alcohol enriched fuel burns slower, hence why some engines are good at pulling back timing to allow them to burn more completely. So many people think that is an indication that there engine is making more power but in reality it is only trying to burn the fuel that is yielding LESS power... The alcohol enriched fuels we get continue to burn past 20 deg ATDC (After Top Dead Center) which adds nothing to the overall power output of an engine.

The fact is these low alcohol fuels are missing the those expensive components to make them something other than some environmental propaganda.
Now this is just a very very basic over view of why I do not like alcohol enriched fuel, a person could write a book on the subject and still not do it justice.



That is the nature of alcohol fuels for many reasons but some of them are above. Just because you added timing does not make them better.

Alcohol enriched fuels are hog wash forced on us from states like California that have the people power to effect and entire continent.

 

While the enviro's have really screwed up Cali gas with 91 craptane and 10% ethanol. If you build the engine and full fuel system to run on 100% ethanol that would be a different story. If I know i'm going to be really pushing the motor I can get pump 95 and 100 VR at two locations in San Diego (it's just expensive). If you got the proper location VR can set you up with mini pump system (about $300) and deliver 55 gallon drums to you. If I can a choice between 91 octain ethanol free or 94 octain with 10% ethanol, I got with the 94.

 

Experimented a bit with this. I have a stock 996tt. When I run 91 that I have confirmed has no ethanol the boost will max at .6 and stay there. When I'm running 93 with ethanol it is at .6 as well. When I run 91 with no ethanol plus a can of Torco, the boost will hold at .7 and will occasionally spike at .8. I have not tried the torco w/ the ethanol fuel, but it likely slows it down a bit.

 

Hi,Can of Torco?? What are you referring to?? There is also more in the equation then just boost,,timing also..

 

Torco is an octane booster in a can. There are a lot of bull**** octane boosters that you can get at autozone or whatever, but Torco is one of the few legitimate ones. I did a ton of research on it. It is popular with the supercharged corvette crowd. One even mixed a tank and sent some of the fuel in to be tested at an octane testing lab and confirmed it's worth. My car runs much stronger on Torco. Only downside is that it leaves a yellowish powder coat in your exhaust, but I haven't heard of anyone having any real problems with the product. I run it all the time. Give the quart can a try. http://torcoracefuel.net/1-pix-torco...or-bottles.jpg

 

Here is the lab test. http://forums.corvetteforum.com/c5-t...t-results.html