Like the E10 debate on the Pug forum, I thought I'd start a similar thread on E85 for performance, and in particular, racing applications. As most are probably aware, the V8 Taxi's have moved to E85. The use of a high ethanol blend the way I see it, is mostly a big plus if you're chasing horsepower. ie
- high latent heat of evaporation and higher octane rating (108?) allow higher compression ratios and thus higher efficiency, resulting in more hp.
One of the downsides is of course you use a lot more fuel as the calorific value is approx. 70% of petrol. Thus you need bigger injectors. As the cost of fuel is a relatively small part of a racing budget (compared to tyres and entry fees), that's not a huge issue. Here are some other thoughts. Please add yours.
Blends - unless you buy in 200L drums, the other 15% could be 91RON rather than 98RON.
Lack of outlets - It easy to fill up with pump fuel on the way to the track. Caltex 98 is reliably the same.
Compatibilty - fuel pump and hoses?
Shelf Life - how long does it last before going stale?