Three different perspectives:

SAE (4th gear)=199/236
Uncorrected (4th gear)=163/193
SAE 3rd gear run=199/218
(This one in third gear I included because the fuel curve is interesting compared to 4th gear. The 4th gear runs generate more torque/PSI/heat and therefore it appears the ECU dumps fuel and probably retards timing toward the end of the 4th gear runs? I would think a little 100 octane would make a positive difference.)




First, realize SAE overcorrects and "uncorrected" doesn't correct enough for altitude with turbos in comparison to sealevel. Dyno numbers just aren't that comparable from state to state or from dyno to dyno for that matter. So...don't compare directly. Somewhere in between SAE and "uncorrected" would be a true sealevel number. (And considering the sealevel numbers we have seen, this statement holds true).

Another 2007 R56 was dynoed the day before mine on the same dyno and got nearly identical numbers as mine.

I still can't believe how fast these 07's are!!

Enjoy!

Kelly

 

So, do you want a co-drive for the Prosolo Finale?

 

Very fascinating AFR's! My AFR's look similar, in that it keeps adding fuel until about 5500 rpm when it goes back to stoich-ish, then starts going rich again 'til redline. I've never seen anything so odd before. Yours seems to oscillate twice whereas mine just oscillates once. In your 3rd gear pull, the AFR is much more stable, wonder if that's because the ECU has less time to "mess it up", LOL! GDI is going to be a steep learning curve. Any of the tuners that has seen this engine's timing curve at WOT knows GDI is some strraaaange stuff versus Port Fuel Injection!

Thanks Kelly for posting your plots!
Cheers,
Ryan

 

I think I will do some pulls in the near future with 100 octane. The heavy load/heat/ECU detected detonation created by 4th gear pulls I'm guessing is cause for addition of fuel and timing retard leading to a decreasing hp curve at high rpms. 100 ocatane should allow that curve to remain flatter toward the end.

Notice how flat the third gear hp curve is toward the end of the run comapred to 4th gear. 3rd gear wasn't adding fuel either (cooler, less load?).

It is kind of humorus and wierd to see the car at 14.7:1 at full throttle/redline. Standard tunning methods would call that a "blowed up engine".

 

From my datalogging Kelly, it's not knocking at all. My ignition charts show a very predictable and smooth ignition advance plot; no knock-induced retardation at all. Based on this, I don't feel 100 octane will help with a stock ignition map. I agree that 14:1 AFR is scary for a 15psig & 10.5:1 compression ratio; but remember the direct injection vastly reduces combustion temps and chamber hot-spots from a more homogeneous charge mixture.

What I want to know is why the stock fuel mapping is doing this sawtooth AFR thing?

 

Good to hear that it is not knock. What do you think is driving the hp curve down toward the end of the 4th gear run, and for that matter adding fuel in 4th gear but not 3rd?