Under Drive pulley question - IMBOC
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post #1 of 7 (permalink) Old 04-17-2019, 04:42 PM Thread Starter

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Question Under Drive pulley question

who is running a set, what did you gain in hp if any?
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post #2 of 7 (permalink) Old 04-17-2019, 05:20 PM
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Don't recommend them. Can cause oil pump damage if the damper pulley is not balanced right. Also possibility of over heating, stiff PS, and undercharging. Not worth it for a few HP. IMHO


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post #3 of 7 (permalink) Old 04-17-2019, 05:36 PM

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I have BBK UDP's put in, in 2010, I got 8 HP to the wheels never an issue so far, had this done when I got the HR Cams. Car now has 127,000km no issues still, finally parking it during winter. Replaced the stock battery after 6 yrs. Just my 2 cents
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post #4 of 7 (permalink) Old 04-17-2019, 08:39 PM
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Originally Posted by bullit4404 View Post
Don't recommend them. Can cause oil pump damage if the damper pulley is not balanced right. Also possibility of over heating, stiff PS, and undercharging. Not worth it for a few HP. IMHO


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post #5 of 7 (permalink) Old 04-17-2019, 09:04 PM
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The Steeda underdrive is SFI approved and the damper pulley is a replacement of the OE. Some other types that piggy back on the original pulley are not as good.


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post #6 of 7 (permalink) Old 04-17-2019, 10:45 PM
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yep, steeda udp on my snake....good!!!!
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post #7 of 7 (permalink) Old 04-18-2019, 03:52 PM
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Steeda crank and WP pulleys on my 08. Not a dramatic feeling by the seat of the pants dyno, but they do seem to give you a little more top-end, where the parasitic losses were previously at their worst. No dyno testing to prove anything, just musings.
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