Stock RS3 HP with 91oct vs 93/4 oct

[Orpo]

Afraid to ask...

I heard a YouTuber make the following statement on a stock RS3 and I’m curious if it’s true.

The statement was. A stock RS3 will make 400hp with 91 octane fuel, however, if you use 93/4 octane the RS3 will make 420 hp.

I have my doubts, but is there any truth to this?

Thx



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[ChrisR14]

It depends on the ECU software they're running. Higher octane ratings give you (or your ECU) the ability to utilize more aggressive ignition-angles which leads to more power and torque.
This is commonly a benefit you can take when you're running a tuned map on your ECU which includes more advanced ignition timings.

The 2.5 TFSI has a quite modern and intelligent ECU so the above statement seems possible since the european RS3 comes with the recommendation to fill with "Super Plus RON98" which equals to 93 AKI.

You can check it yourself by logging the ignition angles in VCDS with 91 oct. If you see the ECU pulling timing you'll most likely have more power with 93 oct fuel.

[Potatohead_RS3]

It will probably make more on 94, but 20hp I doubt it. Maybe 5-8.

Around here we have 91 10% ethanol and 94 no ethanol, I bet they're about the same. You can't really compare to anything in Europe because the engine mapping is different.

[comingabriel]

Stock, on average (comparing all dyno's), will yield, imo, over 425chp.
Would guess +/-436chp on 93 octane.

[Audibot]

Audi does have a tendency to underrate their engines on paper. The B8s were notorious for this. So I wouldn't be surprised to see >400 hp, though by how much is another story altogether.

[Brian@Unitronic]

you will see a good bump in power on the stock calibration switching from 91 to 93/94 octane.

you can see this in the trap speeds of guys running e20 on the stock calibration

[tegxsi]

If you have access to E85 in your area , you can mix up to E30 on the stock ECU without issues.

[Orpo]

I’ll admit I was skeptical.
But maybe there is something to it.

Thx all


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[SlowSedans]

It will probably make more on 94, but 20hp I doubt it. Maybe 5-8.

Around here we have 91 10% ethanol and 94 no ethanol, I bet they're about the same. You can't really compare to anything in Europe because the engine mapping is different.

No it isnt

[Ross_T_Boss]

Not sure on the values, because I've seen some put stock at 395-400hp and others at 420-430hp (on 93ron). My TTRS is almost identical on 1/4 and 100-200kmh times to one that pulled 410hp on the dyno, but then that doesn't mean anything either...

What I will say is that my local 99RON is 93.5AKI and I've done a bit of ethanol/methanol blending, given some of the test times in Germany seemed a bit faster than I was achieving. At about E15 equivalent I was achieving similar times which should be about 102RON/95AKI by my calc. Aral 102 pump gas in Germany is 102RON. Perhaps the Audi engineers stopped off at their local Aral before handing it over to the ECU calibrators...

[TheContrarian]

I used both 91 and 94 on the stock calibration and I didn't notice a difference subjectively. Now that I have a dragy I could do some testing in Mexico, but there are so many other variables.

[sti-tom]

I used both 91 and 94 on the stock calibration and I didn't notice a difference subjectively. Now that I have a dragy I could do some testing in Mexico, but there are so many other variables.

What ethanol content do you have in Winnipeg? In Edmonton we have 91Vpower with no ethanol and 94Husky with 10% ethanol. I am really interested to known what the difference in power could be. For SCCA autox you are allowed up to 15% ethanol, so I would also like to see what power would be made by mixing some E85 with the 94.

[r26372]

What ethanol content do you have in Winnipeg? In Edmonton we have 91Vpower with no ethanol and 94Husky with 10% ethanol. I am really interested to known what the difference in power could be. For SCCA autox you are allowed up to 15% ethanol, so I would also like to see what power would be made by mixing some E85 with the 94.

On the stock tune not much. With a 93 tune adding a couple gallons of e85 can help if the tune is a little aggressive to prevent knock. Not recommended as the tunes aren't setup ideally for e25, but several seem to like this.


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[SolarRS3]

What ethanol content do you have in Winnipeg? In Edmonton we have 91Vpower with no ethanol and 94Husky with 10% ethanol. I am really interested to known what the difference in power could be. For SCCA autox you are allowed up to 15% ethanol, so I would also like to see what power would be made by mixing some E85 with the 94.

Im in winnipeg as well, we have the same as you in Edmonton, 91 vpower 94 10%e husky. I did not test with 91 only but with 94 i got 11.89 @ 115

[Carguycbf]

How would 100 octane work with a Uni stage 1+ tune? I am in CA and no 93 but I live near Laguna Seca and they have 100. Would the Uni Stage1+ tune work or would custom tune be required to get bump from stage 1 with 91 octane. E85 is not readily available in my area.

[Jeff_Jeske]

UNI probably has a 100 unleaded map available if you ask for it. That would rip! However you can always put a few gallons of 102 in the tank to bring the overall octane up to the level you are trying to achieve.

[doady22]

If you look on APR's website they measure a 26hp 18ft-lbs from 91 to 93 so yes there is some to gain. I believe Audi tunes their cars to run optimal on 93 from the Factory.