Quote:
Originally Posted by GyroF-16
Here’s the link:
https://bringatrailer.com/listing/2007-bmw-m-coupe/
The part that I’m referring to was posted in the comments on Feb 19th at 6:17 pm
Excerpt:
“One note the description omits is that this final version of the S54 engine as BMW built only into the E86 MC and MR, has the Siemens engine management system that is superior to the old Bosch system in many ways. This is actually about a 350+ hp engine in factory trim except that BMW put a restrictor baffle in the intake airbox to hold back intake airflow. Removing that immediately uncorks the engine up to what the Siemens engine management and the sweetly done dual exhaust is capable of. There’s another free 10+hp in other little tweaks where BMW built in dumb restrictions that keep the power down to the old Bosch managed S54 engines put out.”
I don’t know who the guy is, but he makes it sound interesting.
I certainly don’t see anything in the “box” prior to the air filter, so I’m not sure what he’s referring to, but I’m certainly interested in whether it makes sense to anyone else. |
There is no intake baffle in the airbox. There is a charcoal filter in the lower half of the airbox that is actually used as part of the emissions system, and below that there is a mesh screen that has to do with laminar air flow into the intake. Removing either of those will not get you +10 HP, and will probably mean a decrease.
The only other thing I can think of that the poster could be referencing is found behind the front left (driver) grill. Rather than having a straight air path or ram air path, BMW actually installed a plastic cup they call a deflector. This deflector "cup" pulls air into the intake likely from a low pressure area behind the grill. The air opening is facing up. Some aftermarket solutions like the RPI scoop and the Eventuri intake scoop remove this deflector "cup" and replace it with a scoop that pushes more air into the intake at speeds above 45 MPH. Some think the deflector was used to prevent water intrusion into the intake, or to pull from a low pressure zone.
Intake Air Deflector
https://www.ecstuning.com/b-genuine-...r/13717519243/
Salty