MembersPage/MattiasSandgren/BmwJonasMtenTurbo (2007-08-19 22:41:34)

Jonas Olhssons BMW 1602

jonas_blackrace_20040703.jpg


News

2007-08-20

We had our first tuning session with the car on the road tonight. As I expected the low load was pretty much impossible to get right with the basic Speed-Density approach and I can't use Alpha-N either because of the fact that this engine uses a turbo. It's the range 2000-4000 rpm that is especially hard. One can tune the VE map to work driving up hill, going down hill the same load site is used which makes it run pig rich. If it wasn't for the CDI ignition box we would've fouled a few plugs.
Any suggestions to a better approach to tune the low load with the feature set we got now ?

2007-08-03

Engine has been started, we had to add the R30 pull-up resistor because it was not mounted (I assembled and built this system myself) but after that the trigger worked. MAP is steady, about 85 kPa @ 1500 rpm idle. As expected this engine needs lambda 0.85 (or at least below 0.90) to idle properly. This engine could _really_ use mappable fuel injection angle to get a reasonable idle and low load quality, or at least development should be pushed towards Alpha-N with pressure compensation.

The engine was only warmed up today and an oil pressure problem appeared that must be resolved before any more is learned.


Engine specification