Mixing e85 + 93 to get APR 100 Octane

[i8snitches]

Ok so I have APR Stage 2 and curious if anyone has done the 1:4 mix of e85 with 93 Octane to get to 100 Octane. I've been rummaging around the B8 forums where a few have done this but closest I found was with stock tune.

At this point it's just a question of, 'Is this possible?" or "You crazymad scientist you'll blow your engine.".

Welcome some feedbacks and insight... Granted this is my daily driver so not sure my wallet can handle 100-octane other than for 1/4 mile and track runs.

[RReddington]

E35 should be good for 100 file, whatever you try, make sure to log.

[bajan01]

E35 should be good for 100 file, whatever you try, make sure to log.

I agree on the logging. I am running about 4 gallons of E85 per full tank of 93 and I did notice less timing being pulled on a 4th gear run. This is on my daily driver SQ5, EPL DP tune.

[i8snitches]

What are you guys using for logging?VCDS?

[bajan01]

What are you guys using for logging?VCDS?

Ross-Tech VCDS and a laptop with Excel to analyze after.

[Loe]

you'll likely be fine. The shift-points of the A6 doesn't pose too much of a fuel system threat, however you may still want to purchase an Autotech HPFP rod just in case. The 3.0t fuel system runs into issues moreso after 6,500rpm - 7,700rpm zone (or higher depending on who sets the tune).

[i8snitches]

Well made the plunge and did the AutoTech Piston and new Hitcahi fuel pump... running e85 (4gallons) to every full tank... with the APR 100oct file

major improvement and so far everything is operating efficiently. I am looking to the install the flex fuel kit to monitor... Anyone have experience with this kit: https://www.fuel-it.com/audi-s4-flex-fuel-kits/

[BlueSteW8]

Well made the plunge and did the AutoTech Piston and new Hitcahi fuel pump... running e85 (4gallons) to every full tank... with the APR 100oct file

major improvement and so far everything is operating efficiently. I am looking to the install the flex fuel kit to monitor... Anyone have experience with this kit: https://www.fuel-it.com/audi-s4-flex-fuel-kits/

I know they are well respected, I've been looking at them and also Zietronix (? ) with an eye towards also adding the P3 vent gauge before getting the 100AKI file.

[ModItNow]

I've had the fuel it kit on my car for a few years. It's solid. If you have a gauge such as p3 there's a option so you can wire it

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