So... on Sunday I headed over to Badger5 to spend some time on the dyno, making sure everything was running OK and optimising my fuelling, which also gave a chance to compare my previous rolling road results on the same dyno when it was owned by Craig at GotBoost. The results were "interesting" to say the least.
Previously the car made 296.9 BHP and 344.4 lb/ft with 8 Deg C ambient temps.
After 5-6 runs on the same dyno since Bill has calibrated it as he sees fit I saw very different, but consistently repeatable results with a best run of 273 BHP and 282 lb/ft with ambient temps of 31 Deg C.
Peak airflow was down to 215 g/s from 227 g/s which accounts for an approximate drop of 284 BHP down to 269 BHP - probably accountable from much warmer, less dense air being sucked past the MAF.
Peak boost of 24 PSI is still being met, with 6 degrees of ignition advance thanks to WMI which kept IATs in the 20s run after run.
Obviously a huge difference in ambient temps is going to account for some discrepancy between these results, though it's the curves themselves that paint a very different picture when compared side-by-side. My initial run at GotBoost is shown in red below, vs my latest runs at Badger5:
Notice how the power appears to come in much
lower in the rev range compared to my latest runs, which just doesn't make sense... even running the car on different ramp rates we weren't able to emulate these characteristics. Wheel spin would appear to be the only real plausible explanation here, which we saw none of on Sundays runs.
So, all a bit strange, though these latest figures would appear more credible than the last so perhaps not quite the torque monster I'd been led to believe!
Initially this was a bit depressing to watch on the dyno, but not forgetting that the car isn't actually down on any power and happily educates M3s, RS4s and a fair proportion of Porsches then it doesn't actually change anything, other than perception.
For a hybrid like mine that's running all the bells and whistles I'm intrigued as to what "real" figures others will see on this particular dyno, time will tell
This aside, the map itself seemed pretty much bang on with a nice smooth power curve and the car is running really well, with some minor fuel trimming adjustments made to
help even things out.
Next up may be Castle Combe for an open track day in early October, unless I opt for a session on the Action day, we'll see
