What is required to run e85 in my b5 a4?

[volkswagensRus]

It's basically the same exact price as premium in my area, which is all I run in the 1.8t anyhow. My mods will basically be motoza tune, a turbo (undecided: might go t3/t4, k04 etc), possibly injectors, possibly tubular exhaust manifold, 3" catless downpipe custom 2.2" OD exhaust all the way back, plus a few other little things. Nothing crazy at all, but the numbers I see on e85 vs premium and being that the 2 fuels are basically the same exact price.... why not??

So what exactly would be involved?

Thanks!

[CarlWeasly]

For starters with E85 you would need to upgrade your fueling system. You use way more E85 than gasoline per hp made, especially at higher boost levels, so a high flow compatible pump, new lines, big injectors(someone can correct me if I'm wrong, but i believe at least 1000cc's), the works. You would also want to tell you tuner that you want to run e85 so you can get a specific file. Given that you're in NY, having a winter tune for regular gasoline wouldn't be a bad idea. Running a flex fuel sensor is also quite difficult (if not impossible) with the stock ECU IIRC. If you end up running standalone it'd be much easier. Before you make the jump on E85 it'd be a good idea to have your turbo, etc, set in stone. I also don't think you'd see the gains of E85 running a K04 if thats what you end up using, it's just too small to see any reasonable HP gains from it, as it would run out of flow very quickly

[Davdraco1]

Yeas the motoza tuned E85 thread. He made over 300 chp on a stock ko3 with E85.

[B5nDisciple]

Yeas the motoza tuned E85 thread. He made over 300 chp on a stock ko3 with E85.

If you're talking about my setup (which I assume), I made over 300 crank torque, not hp. Crank torque was around 220ish.

OP, you've got a 2001 which is tunable from Motoza (prior model B5's are not). You don't need standalone, or to upgrade your fuel lines. All you'll need is injectors and a drop in fuel pump. The DW200 is a cheap option that will work with slight modifications to make it tight in the basket.

I believe Dave (at Motoza) likes 750's for the K04 (F21 Frankenturbo), but I'm not sure about the GTRS. Either way E85 WILL yield more power and torque than 91 Octane, because it's equivalent to ~105 and is super knock resistant. Meaning the timing can be super advanced without knock, thus making more power.

Rods are always a good option unless you want to run a somewhat conservative tune on E85. My tune is at the stock rod limit for E85 and the stock K03, and it's an absolute blast to drive.


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[CarlWeasly]

If you're talking about my setup (which I assume), I made over 300 crank torque, not hp. Crank torque was around 220ish.

OP, you've got a 2001 which is tunable from Motoza (prior model B5's are not). You don't need standalone, or to upgrade your fuel lines. All you'll need is injectors and a drop in fuel pump. The DW200 is a cheap option that will work with slight modifications to make it tight in the basket.

I believe Dave (at Motoza) likes 750's for the K04 (F21 Frankenturbo), but I'm not sure about the GTRS. Either way E85 WILL yield more power and torque than 91 Octane, because it's equivalent to ~105 and is super knock resistant. Meaning the timing can be super advanced without knock, thus making more power.

Rods are always a good option unless you want to run a somewhat conservative tune on E85. My tune is at the stock rod limit for E85 and the stock K03, and it's an absolute blast to drive.


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Disciple, great info for ethanol with a K04! my mind was going on a tangent about BT applications,etc...

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[B5nDisciple]

Disciple, great info for ethanol with a K04! my mind was going on a tangent about BT applications,etc...

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You're welcome. That's fine, it's a big decision. Read through my thread and you'll learn about E85 a bit. It's the "Motoza Stock Turbo E85 Dyno Results" thread.

E85 will deteriorate the stock components faster than gasoline, but it's not as bad as everyone thinks. It's not much more corrosive than pure gasoline.

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[Davdraco1]

Sorry Dicipline. I meant torque.

[B5nDisciple]

Sorry Dicipline. I meant torque.

It's cool Dav, lol.

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[Rodgman15]

I've been curious as to how the stock fuel filter will hold up, from what I've read the e85 likes to eat the glue that holds paper filters together. Trying to rig up a stainless replacement in the stock location but haven't found the banjo dimensions yet.

[S4NIK8]

I never had an issue with the oem fuel filter in 100k miles of e85 use

[Rodgman15]

Good to know!

[wolfe2118]

I've been curious as to how the stock fuel filter will hold up, from what I've read the e85 likes to eat the glue that holds paper filters together. Trying to rig up a stainless replacement in the stock location but haven't found the banjo dimensions yet.

I used E85 exclusively in a 95 Eagle Talon over a decade ago. I never once had any corrosion issues(or any fuel related issues for that matter). It was my daily for two years. Get yourself a wideband O2 if you are really worried about it. I've been using E85 in everyday street cars for years, some with no modifications, others have needed nothing more than a fuel pressure regulator to raise the fuel pressure.