Intake for 3.4L Conversion?

[galtenbaugh]

I have installed a 3.4L crate motor in my 2000 Boxster and I'm having some trouble getting a valid signal from the MAF. I've stumbled through a number of configurations and nothing has worked so far. Currently I have the Boxster airbox with the MAF hole covered, a 90 degree elbow, a MAF housing cut out of a 996 airbox, a 12" silicone tube, and then a final 90 elbow going into the throttle body.

I have a FVD 3.4L Boxster Conversion Mapping.

I dyno'd the car and the AF ratio is erratic and very rich (as rich as 10:1).

I know now that putting the MAF after a 90 degree elbow is never going to work because of the turbulence introduced by the elbow. Tonight I'm going to move the housing to the middle of the 12" tube but that's probably not ideal. The MAF should probably be right after the filter, before the airstream is disturbed.

TTP makes 3.4L Boxster Conversion airbox at http://www.t-t-p.de/english/airbox.php but they want $1500 for it. That seems a bit pricey.

What have other's done? Does anyone make a MAF housing that would work? I believe that the 996 MAF housing has an inside diameter of about 85mm.

Thanks for any suggestions.

George

[VRsyncro]

What have other's done? Does anyone make a MAF housing that would work? I believe that the 996 MAF housing has an inside diameter of about 85mm.

Thanks for any suggestions.

George

Hi George,

I also have a 3.4L converted Boxster that continues to get MAF related CEL's.

I have purchased the airbox lid from a 996 3.4L and have had the MAF Housing professionally removed (i.e. Cut Out) to install in the Boxster.

On my conversion, the builder installed a resistor inline with the MAF to block the signal and ran the conversion with the stock Boxster MAF housing.

The plan is to remove the resistor, install the 3.5" MAF Housing and a K&N Kone filter intake.

Due to my work schedule I won't be able to complete this for the next couple of weeks but will update once completed.

Cheers,

Michael

[catmanluge]

I used a 3.5 inch x 12 inch exhaust tube that I placed my MAF sensor mounting section that was cut out from my original Boxster manifold, I also cut out a section of the metal tube so that it is open below the mounting section then rivided the mounting plate at four points on to the larger tube with some heat applied to slightly flaten the mounting section. A little silicone between the two surfaces helped with a tight seal. It is located in about the same location as it was when stock. I made a cold air box out of aluminium which has a K & N filter. The first filter I had was to restrictive so I had too go to a larger filter. At the end of the steel pipe is 3.5 inch Silcone Flex Tubing extending to the Throttle body from the cold air box.

:renntech:

What have other's done? Does anyone make a MAF housing that would work? I believe that the 996 MAF housing has an inside diameter of about 85mm.

Thanks for any suggestions.

George

Hi George,

I also have a 3.4L converted Boxster that continues to get MAF related CEL's.

I have purchased the airbox lid from a 996 3.4L and have had the MAF Housing professionally removed (i.e. Cut Out) to install in the Boxster.

On my conversion, the builder installed a resistor inline with the MAF to block the signal and ran the conversion with the stock Boxster MAF housing.

The plan is to remove the resistor, install the 3.5" MAF Housing and a K&N Kone filter intake.

Due to my work schedule I won't be able to complete this for the next couple of weeks but will update once completed.

Cheers,

Michael

[tholyoak]

George,

Send me a PM and I'll give you my phone number so we can talk about your situation.

-Todd

[tholyoak]

Cutting up the 996 airbox was a reasonable solution, however a better solution, albeit more expensive, is to buy the 987/Cayman MAF housing. It is the proper diameter and has the screens installed to smooth out the air turbulence. This can be coupled to your custom airbox of choice, or mated to the factory 987 airbox. You can sell the MAF that comes with the housing to recoup some of your $$.

-Todd

Edited June 19, 2009 by tholyoak