Joe240 wrote I think everyone is missing some things here. My Dyno of the M40i May show higher numbers than the Supra Dyno, but these numbers are mute because they were takin at different environmental conditions (ambient temp, cooling fan setup, humidity, altitude, etc.). While they give a relative idea, mine showing more HP doesn’t equate to faster times.
Look at that drag race for instance. Off the line, BMW tunes for more wheel spin than the Supra. And from a roll, the Supra pulls at higher RPM which is why it took a minute before it started pulling the M40i. The tunes were made for different environments all together. The Supra is meant more for the autocross/track where it’s more likely to stay in higher RPM. The M40i is a cruiser where it’ll spend most of its time in the low to mid RPM.
The fact the EU Supra beat the EU M40i doesn’t surprise me because of this. Sure the US M40i puts out more HP, but that still doesn’t equate to faster. The US M40i might be faster 0-60 and in the quarter, but I still wouldn’t be surprised if the Supra edged ahead. I do think the times should be much closer together though and until the Supra starts delivery stateside we won’t know.
I will say this, my Dragy showed me 4.1 0-60 with a quarter of 12.35 which is much closer to what the Supra put down for that drag race. To me, it only makes sense that Toyota published the power figures of the stock engine on BMW tuning, but they most likely tuned it to hit higher target values after the fact because they’d be crucified for letting a convertible clone be the faster of the two all the time (JDM bois are ruthless I’ve noticed).
I hear what you're saying and one dyno run each is hardly going to tell us everything. I have a bit of a drag racing background too and in order for that Supra to pull that Z4, it was making more power.....it isn't about 50 lbs, a bit of wheelspin or the difference in how the Z8 is set up. At the end of the day, that Supra was making more power.....for whatever reason. I agree with you that the your car (or mine) and a Supra will likely be much closer. We should end up on top but who knows. .....I guess I'm just surprised that BMW would tune what is supposed to be the same engine (-M1) differently the two cars.
Time will tell, I suppose. Of course the Supra guys are all pumped about them getting the -O1 shortly. ....if so, it must be because it makes more power....otherwise, why bother?
Dave
