I was going to use all 3 maps for differing fuel types(regular U/L, Super U/L and E85 bioethonol) but the practicalities of having lots of cans of fuel put me off. I ended up driving in with regular U/L in the petrol tank and getting it mapped then draining what was left into some cans and then putting some E85 in the tank.
The E85 is a high octain(105ron?) that in theory allows you to advance the timing more than normal which will give you more power. In PPC Dave Walker mapped his 924 Turbo with it and got about 15 % more power.
Dave knocked a quick basic map up to suit the E85 and went straight on to working on the WOT settings to see if the gains warrented making a full map but my non-turbo engine didn't respond well to it and it didn't allow much more timing to be dialed in. All it gained me was 8lbft in the mid range and 2bhp top end so we decided not to bother with it.
It's probobly the dogs danglies for a turbo engine so it's worth considering using if you get it mapped and reap 15 % gains.
Below shows the results from using regular U/L, there's two lines that closely follow each other, one is the final map and the other is basically the same but with -2 degrees on the igntion.
The power plot lines that are lower are from 2003 when the engine was mapped in my old E34, it's nice to see how my mods since then have helped lift the torque and the power.
If you look at the old torque curve at 2k it was making 180lbft, it's now making apx 30lbft more at the same point. One point of the power plot i'm not too happy about is that peak power drops off to soon in the rev range, if it made it's peak power at around 6-6.2k then i'd may be have another 10bhp. Dave suggested this was down to some sort of bottle neck in flow and to me the most obvious culpret would be the stock exhaust manifold ??
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