danb wrote:Interesting - which tables are switchable in this manner - is it just fuelling? So your not just using the SI-drive to control/modify the fuelling?
I have a EDM (UK) 3.0 spec B - which is 05 but has a 1mb rom ( D2WD701C )
The CEL flash for knock is actually what interests me the most - as E85 isn't available in the UK (although it is in France and the option to use it when driving over there might be useful...)
SI Drive is just different throttle maps and how they influence the throttle
Fuel and timing tables are all the same.
Fueling, timing along with AVCS' angle change, plus throttle tip in and cold start table are mandatory for optimal tuning.
Sgottlieb wrote:How does the car test ethanol content without an ethanol sensor? Wouldn't it be just guessing otherwise?
Same way Koenigsegg does
It has worked flawlessly in the 20+ turbo test cars and one NA 09 Foz during last few months. Only hassle has been my own FXT with E85 so my Foz is running complete open loop tuning, no O2 sensor fueling feedback except the O2 sensors heater element
jay.ritchie wrote:I've been reading mixed messages about the economy of e85, is it more or less efficient?
I read that its less efficient, which is the reason its priced 20% cheaper than unleaded- (to stay competitive).
Yay or nay?
Tuned correctly, E85 can make more cruising torque despite the rich AFR's. Since AFR's are a ratio, a lot of people automactically assume a rich AFR means bad fuel economy. However, if on 98RON you need 60 grams per second of airflow to generate enough torque to overcome wind drag, tyre resistance etc and maintain constant road speed, you need roughly 4 grams of fuel to get 14.7:1. If you maximise torque then you can cut airflow back to say 36g/sec as you need less throttle to keep a constant speed which means you are using the same 4 grams of fuel since the AFR's are 9:1
The O2 sensor still has closed loop feedback to maintain optimal fuel economy as well.