Hi, Guest
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Underdrive Pulley
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10-07-2006, 01:04 AM
How much HP do you gain with an underdrive pulley on a stock engine?
3-5 HP? Are they easy to install? Got an AEM one yesterday for a good deal.
Dan
10-07-2006, 01:09 AM
Kelowna_Focus,Oct 6 2006, 11:04 AM Wrote:How much HP do you gain with an underdrive pulley on a stock engine? Mine was easy to install after I got the damn bolt off. :blink: The engine reved faster, more response but I dont think it added any top end power. ![[Image: ncclogo.jpg]](http://img.photobucket.com/albums/v76/Flofocus/ncclogo.jpg)
10-07-2006, 01:26 AM
I don't know about "real" numbers, but my 50% crank UDP definitely added a lot more responsiveness to the SPI, cleaned up the midrange doldrums and got me back on the high side of 40 MPG on the highway.
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned. Daily driver 2: 2006 Subaru Legacy GT COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
10-07-2006, 02:24 AM
Flofocus,Oct 6 2006, 09:09 AM Wrote:^^^Ditto. Found the exact same results; very rev happy, little or no power increase. You say pulley-as in one? You will need a new, shorter belt as well. And a friend with an impact gun, to get the pulley off.Kelowna_Focus,Oct 6 2006, 11:04 AM Wrote:How much HP do you gain with an underdrive pulley on a stock engine? 
10-07-2006, 02:31 AM
^^^im running the same belt as before and no problem :blink:
over all i like this mod
2002 Ford Focus ZTS (Gave it away)
125whp/129wtq 2006 Subaru Impreza WRX with JDM 6 speed 207whp/273wtq Innovative tuned on Mustang dyno (Stage 2)13.9@99mph 320whp/330wtq Innovative tuned on Mustang dyno (Stage 3) 352whp/360wtq Dynojet 13.3@106mph 2004 Ford F-150 Lariat 2008 Honda CBR600RR "Silver Bullet" R.I.P. 2009 Honda CBR600RR "To Punish & Enslave" 2001 Honda CBR F4i Stunt bike "Burn the Rubber, not your soul" 2013 China 90cc dirt bike 
10-07-2006, 03:09 AM
If your ever going to s/c your engine this is a waste, just an fyi.... I had a udp, and now I have an overdrive pulley :P
10-07-2006, 03:41 AM
Yeah it comes with it's own belt, so I'm set in that regard.
Gas savings is a great way to justify a purchase to the wife!!
Dan
10-07-2006, 04:15 AM
hardk0re,Oct 6 2006, 12:09 PM Wrote:If your ever going to s/c your engine this is a waste, just an fyi.... I had a udp, and now I have an overdrive pulley :P is overdrive pulley just a stock one?
2002 Ford Focus ZTS (Gave it away)
125whp/129wtq 2006 Subaru Impreza WRX with JDM 6 speed 207whp/273wtq Innovative tuned on Mustang dyno (Stage 2)13.9@99mph 320whp/330wtq Innovative tuned on Mustang dyno (Stage 3) 352whp/360wtq Dynojet 13.3@106mph 2004 Ford F-150 Lariat 2008 Honda CBR600RR "Silver Bullet" R.I.P. 2009 Honda CBR600RR "To Punish & Enslave" 2001 Honda CBR F4i Stunt bike "Burn the Rubber, not your soul" 2013 China 90cc dirt bike
10-07-2006, 04:17 AM
NikiterZTS,Oct 6 2006, 02:15 PM Wrote:hardk0re,Oct 6 2006, 12:09 PM Wrote:If your ever going to s/c your engine this is a waste, just an fyi.... I had a udp, and now I have an overdrive pulley :P 5.7" C-F-M overdrive crank pulley.
10-07-2006, 04:32 AM
No supercharging for me. Only so much I can do in my apartment's poorly lit outdoor parking lot.
Dan
12-02-2006, 07:09 AM
Kelowna_Focus,Oct 6 2006, 05:41 PM Wrote:Yeah it comes with it's own belt, so I'm set in that regard. I know what you mean I tell my GF that this part will give me better gas mileage, and she is happy i'm buying it. Wonder if I can get away with saying that the turbo kit I want will double fuel economy. :P 
12-02-2006, 09:31 AM
Kelowna_Focus,Oct 6 2006, 03:04 PM Wrote:How much HP do you gain with an underdrive pulley on a stock engine? Do you get the belt as well? coz the stock belt won't do. the biggest adv of having a UPD is you won't get performance hit when A/C is on, and maybe rev a bit faster. That's about it. yes it is easy to install, IF you can get the bolt off.
2000 ZX3: KW coil-over/IceMan/FC UPD/Megaflow cat-back /energy bushing all over/Ported TB/home make ground wires
260000km and counting..... 
12-29-2006, 08:35 AM
You sure that your AEM unit is a CRANK pulley? Most of them are only alternator pulleys, which are a PITA to install, and don't do squat.
White 2001 ZX3
17" FRPP White Rally Wheels, KW Cup Kit (1.6"  , Progress 22mm Rear Sway, Short Ram Intake w/K&N Cone, Steeda 65mm TB, Ported 2k Manifold, FRPP 9mm Wires, MAC UDP, Clear Markers, OBX 4-1 Shorty Header, OBX ORP, FS Flex, 2nd Gen. MBRP Exhaust, FS/SCT Multi ChipMy Focus My Photography 
12-30-2006, 04:54 AM
Its funny how all you guys had big problems taking off your crank pulley. I never did to tell you the truth lol. Maybe because my car had an UDP slapped on it before it even hit its first oil change :lol:
2004 Ford Focus ZX5 MTX75 - Liquid Grey -
15.7 @ 86mph 1994 Pontiac Trans AM 25th Anniversary 6 spd - 12.3 @ 110mph 2013 Ford Focus ST - Oxford White 1/4 TBD ![[Image: image,Burnin1,black,blue.png]](http://www.sloganizer.net/en/image,Burnin1,black,blue.png)
12-30-2006, 05:00 AM
started moddin it in the first days eh
2002 Ford Focus ZTS (Gave it away)
125whp/129wtq 2006 Subaru Impreza WRX with JDM 6 speed 207whp/273wtq Innovative tuned on Mustang dyno (Stage 2)13.9@99mph 320whp/330wtq Innovative tuned on Mustang dyno (Stage 3) 352whp/360wtq Dynojet 13.3@106mph 2004 Ford F-150 Lariat 2008 Honda CBR600RR "Silver Bullet" R.I.P. 2009 Honda CBR600RR "To Punish & Enslave" 2001 Honda CBR F4i Stunt bike "Burn the Rubber, not your soul" 2013 China 90cc dirt bike
12-30-2006, 06:03 AM
put in ratch in place, add breaker bar against the ground, turn the key and let the battery do the job for u.
2000 ZX3: KW coil-over/IceMan/FC UPD/Megaflow cat-back /energy bushing all over/Ported TB/home make ground wires
260000km and counting.....
12-30-2006, 06:18 AM
that sounds risky.... :ph34r:
2002 Ford Focus ZTS (Gave it away)
125whp/129wtq 2006 Subaru Impreza WRX with JDM 6 speed 207whp/273wtq Innovative tuned on Mustang dyno (Stage 2)13.9@99mph 320whp/330wtq Innovative tuned on Mustang dyno (Stage 3) 352whp/360wtq Dynojet 13.3@106mph 2004 Ford F-150 Lariat 2008 Honda CBR600RR "Silver Bullet" R.I.P. 2009 Honda CBR600RR "To Punish & Enslave" 2001 Honda CBR F4i Stunt bike "Burn the Rubber, not your soul" 2013 China 90cc dirt bike
01-03-2007, 06:09 PM
NikiterZTS,Dec 29 2006, 07:00 PM Wrote:started moddin it in the first days eh I had an AEM Cold Air Intake, Unorthodox Racing UDP and a Magnaflow Cat Back on my car before 5000km's :lol: I'll never forget those good ol' days :)
2004 Ford Focus ZX5 MTX75 - Liquid Grey -
15.7 @ 86mph 1994 Pontiac Trans AM 25th Anniversary 6 spd - 12.3 @ 110mph 2013 Ford Focus ST - Oxford White 1/4 TBD
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