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      06-16-2011, 08:20 AM   #1
Len_Beach
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Difference between early and later underdrive pulleys

Hi Guys,
I've been offered an Underdrive pulley but the Guy doesn't know what year of car it came from.
Apparently there was a big change around May/June '08 and it would appear that the pulleys aren't inderchangeable.
My car is a 57 (UK so Sept' '07 to Feb' '08) so should fall sqaurely into the early category.
What physical differences should I be looking for in the early and later pulleys to establish if this will fit?
Thanks.
Ben
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      06-16-2011, 08:28 AM   #2
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I dont know about the pulley itself but, I do know they changed from a single sided belt to a double sided belt. My car is a July 08 build and uses the double sided belt.
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      06-16-2011, 08:59 AM   #3
FVM3
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so when do they start to build double sided belt?
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      06-16-2011, 11:21 PM   #4
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Go to www.dinan.com and check the two models they offer. Dates and all are listed.
If you have further confusion, call them.
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2009 Silverstone II E92 M3 Coupe - DCT
Dinan Exhaust, RPi scoops, Dinan Tune, Dinan Pulley, BMC filter, LCI Taillights, MS 15mm spacers, Huper Optik tint.
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      06-17-2011, 12:00 AM   #5
tom @ eas
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Quote:
Originally Posted by christopherchenm View Post
so when do they start to build double sided belt?
There are 2 different configurations, the change happened on or about 5/08 on the manual transmission and was always present on DCT:

SOP-5/08 6MT - Configuration 1
6/08+ 6MT, including all DCT models - configuration 2

Belt routing:

2008-5/08 6SPD models (non DCT) belt routing


6/08+ and all DCT belt routing


Hope this helps, pulleys provide great (and inexpensive) hp gains.
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      06-17-2011, 01:41 AM   #6
Len_Beach
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Thanks Tom,
So the crankshaft pulley is unchanged, it's just the belt routing and the use of a different type of belt?
Cheers,
Ben
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