Anyone here installed an underdrive pulley?
#1
Intermediate
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Join Date: Jul 2015
Location: Sydney, Australia
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Hi All, has anyone here installed an underdrive pulley on their GT3?
If so, how did you get the M16x15 Bolt off? ....is this another case of me not being forceful enough
If so, how did you get the M16x15 Bolt off? ....is this another case of me not being forceful enough
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#4
Race Car
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There is a specific pulley holding tool that porsche uses in the shop that's pretty trick but expensive and difficult to get. As was stated put the car on the ground, put someone in the drivers seat standing on the brakes with the e brake set and it should come off with a breaker bar.
#5
Three Wheelin'
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I also find it very useful to use an impact wrench (battery powered) to loosen bolts and nuts. Best tool if a nut sits on a shaft or bolt that can also rotate with the nut you are trying to remove.
But as you said, I dont recommend use to fasten.
#7
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#8
Racer
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I can't comment on fitting the pulley to my current GT3, but I fitted one to my Boxster S a few years ago.
Jake Raby (Flat 6) believed it added about 5 hp max to the engine (which I doubt you would feel) but the improvement was in the low / middle rev range where a quicker pickup could definitely be felt.
The nay sayers said that with the alternator turning over slower @ idle, you would discharge the battery in heavy traffic, but I never experienced that in 6-7 years of ownership.
Jake Raby (Flat 6) believed it added about 5 hp max to the engine (which I doubt you would feel) but the improvement was in the low / middle rev range where a quicker pickup could definitely be felt.
The nay sayers said that with the alternator turning over slower @ idle, you would discharge the battery in heavy traffic, but I never experienced that in 6-7 years of ownership.
#11
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Cup pulley here. No issues...