No power gain from Underdrive Pulley?...

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No power gain from Underdrive Pulley?...

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Boxtaboy No power gain from Underdrive... 01-18-2017, 10:15 AM

NewArt When I installed a UDP, it... 01-18-2017, 10:30 AM

WorkInProgressK Correct. Pumps cavitate (the... 01-18-2017, 11:00 AM

Boxtaboy I don't doubt that statement.... 01-18-2017, 10:50 AM

Nine8Six VJ should have included a... 01-18-2017, 10:50 AM

thstone +1 ^^^^ The dyno baseline... 01-18-2017, 01:52 PM

WorkInProgressK Considering the difficulty of... 01-18-2017, 02:46 PM

Boxtaboy I think he says in the video... 01-18-2017, 10:53 AM

Nine8Six oh did he. missed it 01-18-2017, 10:55 AM

steved0x * Torque the bolt to 50 NM... 01-18-2017, 11:46 AM

heliguy I don't wanna believe this. :( 01-18-2017, 01:23 PM

steved0x Me neither... Maybe... 01-18-2017, 02:12 PM

heliguy Agreed. I thought I could... 01-18-2017, 03:48 PM

Boxtaboy Any truth to some comments in... 01-19-2017, 03:01 AM

Quadcammer not on the 986. Its a simple... 01-19-2017, 04:08 AM

Gilles On my 987 the OEM pulley did... 01-19-2017, 07:01 AM

Porsche9 My UDP has been on my car for... 01-19-2017, 08:25 AM

Topless Wow, 273.8 RWHP sounds like a... 01-19-2017, 09:15 AM

Gilles I am sorry but forgot to... 01-19-2017, 10:22 AM

jaykay -parasitic engine torque load... 01-21-2017, 12:26 PM

Nine8Six Can't personally confirm this... 01-19-2017, 03:16 AM

Boxtaboy Hmmmm...interesting. Anyone... 01-19-2017, 03:35 AM

edc It's not wheel horsepower.... 01-19-2017, 06:09 AM

tommy583 Wouldn't you want to compare... 01-19-2017, 06:49 AM

heliguy Good point. 01-19-2017, 06:56 AM

Timco I have absolutely no doubt it... 01-19-2017, 06:50 AM

particlewave Placebo effect. ;) I see... 01-19-2017, 09:23 AM

The Radium King less rotating mass (lighter... 01-19-2017, 09:41 AM

particlewave Inertia. The difference in... 01-19-2017, 10:05 AM

jcslocum A lighter flywheel will add... 01-22-2017, 03:45 AM

Anker Getting 10HP from an... 01-19-2017, 10:22 AM

Boxtaboy Hey, it proved the mod gained... 01-19-2017, 10:33 AM

edc I've done this mod twice now... 01-19-2017, 10:35 AM

Boxtaboy So you're saying it's worth... 01-19-2017, 10:37 AM

edc I've never thought it would... 01-19-2017, 10:57 AM

edc The mod is cheap if you know... 01-19-2017, 10:58 AM

heliguy So what would an ECU flash... 01-19-2017, 02:10 PM

JFP in PA Not a lot. 01-19-2017, 02:20 PM

edc I dyno'd about 6 bhp from a... 01-19-2017, 03:35 PM

Anker The underdrive pulley reduces... 01-19-2017, 02:39 PM

j.fro Are we talking 4" or 5"... 01-19-2017, 03:19 PM

Steve Tinker I think there is some... 01-19-2017, 03:30 PM

Gelbster Makes perfect sense. 01-21-2017, 09:42 AM

itsnotanova I wish Jake Raby was still... 01-21-2017, 10:25 AM

Porsche9 Did I miss something? 01-21-2017, 08:42 PM

More replies below current depth...

rfuerst911sc I have a few comments to ad ,... 01-22-2017, 07:22 AM

Lapister That UK guys video on his... 01-21-2017, 07:55 PM

heliguy Has anyone seen this on... 01-22-2017, 04:38 AM

Nine8Six Blk on white bud:... 01-22-2017, 04:53 AM

BrokenLinkage Wait a minute. This forum,... 01-22-2017, 06:27 AM

Gelbster This Thread is a perfect... 01-22-2017, 09:04 AM

10/10ths Can't we all just get along? 01-22-2017, 09:42 AM

heliguy http://986forum.com/forums/upl... 01-22-2017, 06:43 AM

edc Looks just like the usual... 01-22-2017, 06:50 AM

Gelbster Agreed. The Jake-baiters won.... 01-22-2017, 09:58 AM

BrokenLinkage Jake- thank you, both for... 01-22-2017, 10:31 AM

Gelbster Yes, because it is a... 01-22-2017, 12:14 PM

njbray Sad that Jake Baby will no... 01-22-2017, 06:08 PM

WorkInProgressK Where is the nut? Then it's... 01-22-2017, 06:29 PM

JFP in PA Re read what the quote says;... 01-23-2017, 02:00 AM

01-19-2017, 10:57 AM

#14

edc

550 Anniversary

Join Date: Jul 2012

Location: Surrey, UK

Posts: 747

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I've never thought it would make any significant power so have never bothered to dyno the mod. That's saying something as my 2 Boxsters have probably been on the dyno about 8 times between them measuring the mod difference.

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Current: 550 Spyder Anniversary- Carnewal exhaust - 100 cell cats - stainless manifolds - 4" underdrive pulley - poly gearbox mounts - rear lower alu brace - adjustable rear toe links
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