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jb92563 · 03-29-2014, 03:47 PM

Someone had said that there would be no AC at idle with a 4" UDP, so I thought I'd post my results to clarify.

I installed my Tarret 4" under drive pulley and all went well and better than predicted.

Particularly, I am happy to report that a 2001 S with the 4" under drive pulley still allows full operation of the air conditioning at idle!

Here is the Proof below:

With the Tarret UDP installed and the engine up to full operating temperature,
Ambient temperature 70 F as shown on the guage, and ~750 rpm at idle for over 5 minutes, airconditioning set at full the temperature of the air leaving the vent is ~38 F.

Tarret UDP and Original

03-29-2014, 03:47 PM	#30
jb92563 Registered User Join Date: Apr 2012 Location: Riverside, CA Posts: 1,665	Someone had said that there would be no AC at idle with a 4" UDP, so I thought I'd post my results to clarify. I installed my Tarret 4" under drive pulley and all went well and better than predicted. Particularly, I am happy to report that a 2001 S with the 4" under drive pulley still allows full operation of the air conditioning at idle! Here is the Proof below: With the Tarret UDP installed and the engine up to full operating temperature, Ambient temperature 70 F as shown on the guage, and ~750 rpm at idle for over 5 minutes, airconditioning set at full the temperature of the air leaving the vent is ~38 F. Tarret UDP and Original __________________ "It broke because it wants to be Upgraded " 2012 Porsche Performance Driving School - SanDiego region 2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP, Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)