K04/RS6/What Octane is best in the city Q&A

[R_Ethug]

K04/RS6/What Octane is best in the city Q&A

[fazda]

Re: K04/RS6/What Octane is best in the city Q&A

i have 94 right by my house and always run it, in every car i own, they seem to like it alot more than the 91.

[The Brice]

Re: K04/RS6/What Octane is best in the city Q&A

HAHA! nice move, anyways back on topic or is it back off topic!?

Regarding this RS6 debate, I don't care much about what most of the guys over on AZ say, most have them have never seen anything other than a K03 or K04 in their life, much less driven anything different. I have a fair bit of experience with these cars, but when Mike Shimon speaks, I listen.

VAST sells an OTS tune for the RS6's, but they are always willing to tweak your pump file if you want in order to set a semi-custom tune. I agree with not running race gas on a stock motor with RS6 turbos. In Calgary if we were to run race gas we would approximate the performance you could expect at sea level with pump gas, which is right at the limit of what the stock motor can handle.

I think you taking this wrong Jordan I'm not going against what your saying at all, my point with the AZ attachment is that there is a discussion as to whether or not 2 separate pump files would be needed for the RS6 tune, one for stock and one for rods. This is where "AAAA" talks to Prince who says that Vast uses 1 file for their pump program and that yes it can be used on the stock motor. I chatted with another individual in Ontario who had his RS6 tune done with Vast and he says the same thing, his engine is stock and the Vast said with your engine in good shape you have nothing to worry about, even when he adds some meth into the mix as was planned. You can use their full potential is my understanding on pump gas tune, the Vast file is about 26psi tapering to 24psi, just if you wanted a full on race gas file where guys are pushing 30psi and nearly 550whp (sea level mind you) you should probably get some rods, you would be borderline for sure. After all I've heard of guys throwing rods at less than 500whp.

[RONDAL]

Re: K04/RS6/What Octane is best in the city Q&A

because of the elevation you dont "NEED" 94 to run a 94 program. That same program at sea level would require a higher octane.

As you rise in elevation the amount of octane required to avoid knocking decreases. Go up high enough and you could theoretically get away with 87 on a 94 program.

Obviously running 94 at elevation will give you greater benefit than running 91, im not disputing that. If you were comparing it to sea level though it would be like running 98 octane or thereabouts.

There is a mathamatical calculation that shows octane to feed in elevation relationship. If someone want so dig it out throw it up i'd love to have it again. I came across all of it when looking into high boost programs for the VRT here versus when I went home.

[The_Jerbel]

Re: K04/RS6/What Octane is best in the city Q&A

HAHA! nice move, anyways back on topic or is it back off topic!?




I think you taking this wrong Jordan I'm not going against what your saying at all, my point with the AZ attachment is that there is a discussion as to whether or not 2 separate pump files would be needed for the RS6 tune, one for stock and one for rods. This is where "AAAA" talks to Prince who says that Vast uses 1 file for their pump program and that yes it can be used on the stock motor. I chatted with another individual in Ontario who had his RS6 tune done with Vast and he says the same thing, his engine is stock and the Vast said with your engine in good shape you have nothing to worry about, even when he adds some meth into the mix as was planned. You can use their full potential is my understanding on pump gas tune, the Vast file is about 26psi tapering to 24psi, just if you wanted a full on race gas file where guys are pushing 30psi and nearly 550whp (sea level mind you) you should probably get some rods, you would be borderline for sure. After all I've heard of guys throwing rods at less than 500whp.

I agree with that 100%. Even on race gas here in Calgary, I doubt you'd push more than 525WHP with RS6 turbos..

I've heard of guys throwing rods with 250 chp
The key here is to have a "healthy engine" if you want to run RS6 turbos on a stock motor.

As to the 94 octane thing....all I can say is that when using 94oct vs. 91oct in the same cars on the same stretch of road, I get roughly the same knock values and CF's using both fuels. I haven't tested since the winter, though, so maybe it's different now. I'll try some and see.

[R-Audi]

Re: K04/RS6/What Octane is best in the city Q&A

Ok.. so maybe im completely missing the point on this...

BUT If say 91 octane here... is actually the equivalent of say 93 because of the altitude, wouldnt that mean that our gas is actually better? (93->95?) I know the altitude also affects the density of the air negatively when it comes to cars, but how much difference does the 'increased' octane of the gas have?

[R_Ethug]

Re: K04/RS6/What Octane is best in the city Q&A

i use 91 on my 91 program and 94 on my 93 program with no complaints.
never tried 91 on 93.. dont' feel like bothering

but if thats the case you mise as well run regular 87 on a 91 program

or i'll start filling up the AR with 87 then because its a ***** to fill 75l tank!!

[dogbreath]

Re: K04/RS6/What Octane is best in the city Q&A

Is there a differnece in types of W/M kits? can I put any kit on my car and how long does it take to install I have freind that has a honda will that w/m kit fit on my car?

[R-Audi]

Re: K04/RS6/What Octane is best in the city Q&A

Most are universal... you just have to have the proper size jets.

[Orvis]

Re: Allroad Turbo Project

Does anyone know why we only get 91oct gas?

This is how it was explained to me. The reasoning behind why we (Alberta) see only 91 at all the pumps is because of our higher elevation.
For example, Calgary sits at approximately 3400ft above sea level. At this elevation a 91 octane fuel will burn the same as a 93 octane fuel at a lower elevations such as Toronto at 253ft (where they have higher octane gas at the pumps.)
Now I took this explanation at face value, but I have never bothered to confirm if it is fact.

On that note, my Alpina calls for 98ROZ - 93octane because of the high compression rate of 10:1, but I use 91 octane with no adverse affects.
I refuse to use Husky's 94 blended as I have been told the ethanol can eat away plastic/rubber parts in of the fuel system in older cars as well as alot of newer cars.

[The_Jerbel]

Re: Allroad Turbo Project

People have said that high elevation causes fuel to act as if it were higher octane, but I haven't seen that to be the case in actuality. Scientifically it doesn't make sense either. With lower density air the fuel will release less energy and make less power during combustion, but when the fuel is being compressed in the cylinder, a 10:1 compression ratio is a 10:1 ratio, regardless of the outside air pressure. The fuel compression in the cylinder is an isolated system relative to the ambient air pressure. Lower outside air pressure doesn't make the fuel any more resistant to "detonation" (there you go aliencurv ), and therefore shouldn't increase it's octane rating. Has anybody found any solid evidence that I'm wrong here?

During testing I've found our fuel to require more timing retard and give higher knock voltages than equal rating fuel at lower elevation...

This is how it was explained to me. The reasoning behind why we (Alberta) see only 91 at all the pumps is because of our higher elevation.
For example, Calgary sits at approximately 3400ft above sea level. At this elevation a 91 octane fuel will burn the same as a 93 octane fuel at a lower elevations such as Toronto at 253ft (where they have higher octane gas at the pumps.)
Now I took this explanation at face value, but I have never bothered to confirm if it is fact.

On that note, my Alpina calls for 98ROZ - 93octane because of the high compression rate of 10:1, but I use 91 octane with no adverse affects.
I refuse to use Husky's 94 blended as I have been told the ethanol can eat away plastic/rubber parts in of the fuel system in older cars as well as alot of newer cars.

[R-Audi]

Re: K04/RS6/What Octane is best in the city Q&A

"Scientifically" I dont know exactly how it works, but I have to beleive that someone in the gas world does. From what Ive read, thats the reason why we get gas that is in the 87ish octane level... that gas wouldnt cut it for cars at sea level.

[Disturbo]

Re: K04/RS6/What Octane is best in the city Q&A

They even sell 85 Oct fuel in the US. now thats really asking for problems

[T-Dubbs]

Re: K04/RS6/What Octane is best in the city Q&A

my trailblazer knocks the same with shell 91 and sunoco 94.
the gas isnt much better in toronto, than in the west.

[The_Jerbel]

Re: K04/RS6/What Octane is best in the city Q&A

"Scientifically" I dont know exactly how it works, but I have to beleive that someone in the gas world does. From what Ive read, thats the reason why we get gas that is in the 87ish octane level... that gas wouldnt cut it for cars at sea level.

As Dom pointed out, they have gas down at sea level with octane ratings just as low as ours which works for them just fine.

What I'm asking is this: Is there any reputable reference which states that high elevation causes fuel to act as if it had a higher octane rating than it really does, or is this just hear-say?

From my understanding and testing, it's just not the case. But again, I may be wrong, but it'll take more than a few kids on AZ to convince me that I'm wrong. I'm wondering where you guys are hearing this from?