986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - IPD Plenum

michaelpetersen3 · 08-08-2021, 07:33 AM

Husker / Blue - All good. We're all in the learning mode, thx for your comments ;-)

Azlvr, the larger TB on the larger motor is directionally correct to improve HP. But it might not make any improvements if the TB is not in the critical path of the air flow resistance. You can test this either on the dyno, or on a flow bench (less common but cheaper way to test intakes).

If you have both TB's, use the larger 81mm, but don't expect much, and don't spend big $ to incorporate it. My 3.2L tests suggest you will find the most benefits from the exhaust flow improvements.

08-08-2021, 07:33 AM	#51
michaelpetersen3 Registered User Join Date: May 2019 Location: Deephaven, MN Posts: 21	Husker / Blue - All good. We're all in the learning mode, thx for your comments ;-) Azlvr, the larger TB on the larger motor is directionally correct to improve HP. But it might not make any improvements if the TB is not in the critical path of the air flow resistance. You can test this either on the dyno, or on a flow bench (less common but cheaper way to test intakes). If you have both TB's, use the larger 81mm, but don't expect much, and don't spend big $ to incorporate it. My 3.2L tests suggest you will find the most benefits from the exhaust flow improvements.