Intake diameter of Cayman S?

[Porsche_Monkey_4life]

I was wondering if anyone knows the inner diameter of the Mass Air Flow sensor housing in the Cayman S. I have a 986 with a 3.4 996 engine and I need a 3.5 inch mass air flow sensor housing to get my car running properly. Anyone have any ideas? Thanks :renntech:

[qikqbn]

My original 1998 986 boxster maf housing measures inner diameter of 70-72mm.

(76mm or 3 inch outer diameter)

The 3.4 liter 996/Cayman maf housing measures inner diameter of 83-85 mm

(90mm outer or 3.5 inch outer diameter)

A difference of close to 20 percent in size.

[berty987]

The cayman is also variocam plus, I think the 996 will be variocam only. A lot of cayman 3.4 owners fit the Gt3 throttle body from a 996 as part of the softronic ECU upgrade, this releases another 20-40 Hp when installed with a sports exhaust. Possibly worth considering at the same time as you will be creating a hybrid anyway.

Edited August 21, 2009 by berty987

[catmanluge]

I used a 3.5 inch metal tube and mated the MAF from my original with silicone and rivets. It works fine plus made a cold air intake box out of aluminium to relace the stock air box. 3.5 inch Silicone tubing connects the tube coming out of the new air box to the Throttle Body..

The cayman is also variocam plus, I think the 996 will be variocam only. A lot of cayman 3.4 owners fit the Gt3 throttle body from a 996 as part of the softronic ECU upgrade, this releases another 20-40 Hp when installed with a sports exhaust. Possibly worth considering at the same time as you will be creating a hybrid anyway.

[jaykay]

My original 1998 986 boxster maf housing measures inner diameter of 70-72mm.

(76mm or 3 inch outer diameter)

The 3.4 liter 996/Cayman maf housing measures inner diameter of 83-85 mm

(90mm outer or 3.5 inch outer diameter)

A difference of close to 20 percent in size.

Would your 98 MAF housing diameter be the same for the 2000 S 3.2L. I am suprised to hear that there was such a variance in diameter. Would this not affect the reading and ECU?

[Brad Roberts]

All Boxsters utilized the same air box and MAF tube from 97-2004 (except the 550 anniversary edition which utilized the 987 air box that hadn't been released yet)

97 utilized a variation of the last 993 computer, 98-99 utilized the same computer as the 99 3.4. All computers changed when they went to fly-by-wire throttle in 00, then changed again in 02 when they went to variable valve lift.