MINI2 - MINI Forum - View Single Post

obehave · Oct 6th, 2004, 03:47 PM

Quote: Originally Posted by phaedrus

Yes, the flap opens at 4500 rpm -- where greater airflow is actually needed -- drawing air from under the left pollen bezel. But that's all the intake really is -- the stock intake with an added flap, actuator, and JCW logo. I'm assuming they chose this 'cost-effective' way in order to keep the JCW kit's price in check.

That's a good point about the strain on the injectors, though -- I've always wondered if there were any such issues with adding an after-market intake, as well as why JCW initially did not choose to modify theirs.

During some independent testing, an acquaintance with the previous JCW package installed found that the fuel mixture ran too rich at high throttle. This likely means that not enough air is mixing with the fuel for proper combustion. Naturally he opted for an after-market air intake and the problem quickly went away.

That last bit is a little contrary to a lot of information that has been posted here.
The MINI runs rich, period.
Intake, exhaust, 15% pulley and throttle body on one and it'll still run rich. The rich mixture is intentional at full boost and is used to help cool the supercharger.
Just changing out an intake isn't really going to make much difference.

The stock injectors seem to be fine at 200 or so BHP.

Oct 6th, 2004, 03:47 PM	#4
obehave Mini Mod Join Date: Sep 2002 Local Time: 11:59 PM Posts: 9,310 Offline	Quote: Originally Posted by phaedrus Yes, the flap opens at 4500 rpm -- where greater airflow is actually needed -- drawing air from under the left pollen bezel. But that's all the intake really is -- the stock intake with an added flap, actuator, and JCW logo. I'm assuming they chose this 'cost-effective' way in order to keep the JCW kit's price in check. That's a good point about the strain on the injectors, though -- I've always wondered if there were any such issues with adding an after-market intake, as well as why JCW initially did not choose to modify theirs. During some independent testing, an acquaintance with the previous JCW package installed found that the fuel mixture ran too rich at high throttle. This likely means that not enough air is mixing with the fuel for proper combustion. Naturally he opted for an after-market air intake and the problem quickly went away. That last bit is a little contrary to a lot of information that has been posted here. The MINI runs rich, period. Intake, exhaust, 15% pulley and throttle body on one and it'll still run rich. The rich mixture is intentional at full boost and is used to help cool the supercharger. Just changing out an intake isn't really going to make much difference. The stock injectors seem to be fine at 200 or so BHP.