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Shuie's Avatar
 
Join Date: Feb 2003
Location: ....down Highway 61
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ITBs w/Motronic ECU, cam choices for 3.2 Carrera rebuilds

Do ITBs gain anything over a stock Carrera intake if the Motronic ECU is retained?

Cam choice is what Im really curious about. I know I cant use anything hotter than a 20/21, 964, or 993 Supercup cam with the common plenum carerra intake due to fuel reversion issues. Can the Motronic ECU be chipped to use a hotter cam like a GE40, GE60, or GE80 if ITBs are used instead of the Carrera intake? Or would I need to go to full engine management if I wanted the hotter cam?

TIA
Old 05-21-2005, 09:11 PM
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Sherman:

You may use any cam you wish with ITB's & Motronic.

The real issue here is that such combinations require custom mapping done on either an engine dyno or load-type chassis dyno and thats NOT cheap. Full engine management is easier for someone to build the maps needed to retain any semblance of durability.
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Steve Weiner
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Old 05-21-2005, 09:23 PM
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The only other consideration is valve to piston clearances. The close lobe centers with some of these cams can cause a problem with V to P.
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John Dougherty
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Old 05-21-2005, 11:36 PM
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Thanks guys. Great info as always
Old 05-22-2005, 08:03 AM
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How do you retain the motronics AFM w/ ITBs? Can it be chipped to do alpha-N or speed-density? Just curious...

SMD
Old 05-23-2005, 10:49 AM
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