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+--- Thread: Underdrive Pulley (/showthread.php?tid=7940)
Underdrive Pulley - Kelowna_Focus - 10-07-2006
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.
Underdrive Pulley - Flofocus - 10-07-2006
Kelowna_Focus,Oct 6 2006, 11:04 AM Wrote: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.
[right][snapback]210425[/snapback][/right]
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.
Underdrive Pulley - NOS2Go4Me - 10-07-2006
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.
Underdrive Pulley - 02ztsian - 10-07-2006
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?
3-5 HP?
Are they easy to install?
Got an AEM one yesterday for a good deal.
[right][snapback]210425[/snapback][/right]
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.
[right][snapback]210426[/snapback][/right]
Underdrive Pulley - NikiterZTS - 10-07-2006
^^^im running the same belt as before and no problem :blink:
over all i like this mod
Underdrive Pulley - hardk0re - 10-07-2006
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
Underdrive Pulley - Kelowna_Focus - 10-07-2006
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!!
Underdrive Pulley - NikiterZTS - 10-07-2006
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
[right][snapback]210449[/snapback][/right]
is overdrive pulley just a stock one?
Underdrive Pulley - hardk0re - 10-07-2006
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
[right][snapback]210449[/snapback][/right]
is overdrive pulley just a stock one?
[right][snapback]210457[/snapback][/right]
5.7" C-F-M overdrive crank pulley.
Underdrive Pulley - Kelowna_Focus - 10-07-2006
No supercharging for me. Only so much I can do in my apartment's poorly lit outdoor parking lot.
Underdrive Pulley - Mike Rudat - 12-02-2006
Kelowna_Focus,Oct 6 2006, 05:41 PM Wrote: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!!
[right][snapback]210453[/snapback][/right]
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
Underdrive Pulley - Focus Is Art - 12-02-2006
Kelowna_Focus,Oct 6 2006, 03:04 PM Wrote: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.
[right][snapback]210425[/snapback][/right]
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.
Underdrive Pulley - Casper - 12-29-2006
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.
Underdrive Pulley - Burnin21 - 12-30-2006
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:
Underdrive Pulley - NikiterZTS - 12-30-2006
started moddin it in the first days eh
Underdrive Pulley - Focus Is Art - 12-30-2006
put in ratch in place, add breaker bar against the ground, turn the key and let the battery do the job for u.
Underdrive Pulley - NikiterZTS - 12-30-2006
that sounds risky.... :ph34r:
Underdrive Pulley - Burnin21 - 01-03-2007
NikiterZTS,Dec 29 2006, 07:00 PM Wrote:started moddin it in the first days eh
[right][snapback]221765[/snapback][/right]
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 :)