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View Full Version : Underdrive pulley, what can I expect?


4drcbra
11-28-2011, 08:11 PM
I know I will gain throttle responce and a quicker rev. Will any of my accessories (water pump or altenator) suffer from this mod and will I need to change my fan at all?
RacerX
11-28-2011, 08:17 PM
I know I will gain throttle responce and a quicker rev. Will any of my accessories (water pump or altenator) suffer from this mod and will I need to change my fan at all?
You may have to up the idle to keep the alt pushing juice. I think the water pump isn't that much of a change.
You will also gain 1 Alabama Hotpocket. :beer:
4drcbra
11-28-2011, 08:23 PM
Hmmm. If an alabama hot pocket is better than a mississippi molly whopper than count me in!
slickster
11-28-2011, 08:26 PM
I think it like 5rwhp. Also a bit more mpg
fastblackmerc
11-28-2011, 08:31 PM
I know I will gain throttle responce and a quicker rev. Will any of my accessories (water pump or altenator) suffer from this mod and will I need to change my fan at all?

The engine will spool up quicker, nothing will suffer from adding the underdrive pulleys, in fact they may last longer since they will rotate less. The fan is electric so there is no affect on it from the underdrives.

As mentioned, bump up the idle RPM by 200 so your lights won't dim when in gear and stopped.
guspech750
11-28-2011, 08:37 PM
I loved them for the short time I had them on. I'd buy them again if I was going to own a Marauder that's not S/C.


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Eaton Swap + 4.10's = Wreeeeeeeeeedom!!
fastblackmerc
11-28-2011, 08:51 PM
I loved them for the short time I had them on. I'd buy them again if I was going to own a Marauder that's not S/C.


---
- Sent from my iPhone
Eaton Swap + 4.10's = Wreeeeeeeeeedom!!

Same here..... took them off when I went to a electric water pump.
RF Overlord
11-28-2011, 09:14 PM
Agree w/fastblackmerc...

Have them on Phoebe and it's a small but noticeable improvement...by itself perhaps not worth it, but in combo with a PHP intake spacer and/or a JLT or K&N cold-air kit and it's definitely worth it. There is no down side.
slickster
11-28-2011, 11:48 PM
Same here..... took them off when I went to a electric water pump.

Can't we have both
bigmerc281
11-29-2011, 12:23 AM
Agree w/fastblackmerc...

Have them on Phoebe and it's a small but noticeable improvement...by itself perhaps not worth it, but in combo with a PHP intake spacer and/or a JLT or K&N cold-air kit and it's definitely worth it. There is no down side.


The combo of the k&n and u/d pulleys is good or you have to have the spacer as well?
too make it good
RoyLPita
11-29-2011, 05:47 AM
I've had u/d pullies on my MM for a while. I've had no issues.
tbone
11-29-2011, 11:25 AM
I loved them for the short time I had them on. I'd buy them again if I was going to own a Marauder that's not S/C.


---
- Sent from my iPhone
Eaton Swap + 4.10's = Wreeeeeeeeeedom!!

Still wanting to have mine installed that I got from you Joe. Something always interferes with my evil plan.:mad:
guspech750
11-29-2011, 11:31 AM
Still wanting to have mine installed that I got from you Joe. Something always interferes with my evil plan.:mad:

Chop chop bitchh!!!


---
- Sent from my iPhone
Eaton Swap + 4.10's = Wreeeeeeeeeedom!!
RacerX
11-29-2011, 11:41 AM
Still wanting to have mine installed that I got from you Joe. Something always interferes with my evil plan.:mad:
It's a half hour job if you have the crank pulley puller. :P
CodeMan
11-29-2011, 12:44 PM
I've had u/d pullies on my MM for a while. I've had no issues.


had udp's in my beast for 18 months now. After installation, I did notice a better throttle response and lil bit of increase of RPM’s while on the highway (+ 200rpm). No ill feelings about purchasing them...:up:
Pops
11-29-2011, 01:05 PM
My car picked up a tenth of a second at the track with them. Cheapest gain of anything we did!
MrBluGruv
11-29-2011, 01:24 PM
lil bit of increase of RPM’s while on the highway (+ 200rpm).

That's not possible from pulleys, unless I'm misunderstanding what it is you're trying to say.
tbone
11-29-2011, 01:37 PM
It's a half hour job if you have the crank pulley puller. :P

I don't have one and I'm feeling lazy.:rolleyes:
fastblackmerc
11-29-2011, 02:38 PM
had udp's in my beast for 18 months now. After installation, I did notice a better throttle response and lil bit of increase of RPM’s while on the highway (+ 200rpm). No ill feelings about purchasing them...:up:

No way that can happen with underdrives.

If you did 4.10 gears, then yes your RPMs will increase.
Mr. Man
11-29-2011, 02:54 PM
What does the intake spacer do? I've always heard these were a waste and often caused a whistling sound.
MOTOWN
11-29-2011, 03:34 PM
What does the intake spacer do? I've always heard these were a waste and often caused a whistling sound.

:popcorn::popcorn:
MrBluGruv
11-30-2011, 08:54 AM
http://bb.bc4x4.com/showthread.php?7163-Throttle-Body-Spacer...Does-it-REALLY-Work

This forum post actually shed more light than anything I bothered to find before.

For those that don't want to click through, the key notes were that a member there that was part of a study on spacers found that on a Chevy 350 that produced 180hp, no intake spacer shorter than 1 meter (read: nothing that fit under the hood, by a long shot), produced any difference, except for throttle response lag.

Honestly, I just don't buy that they are effective. The only way I can imagine them giving some improvement would be the same way that backpressure would be beneficial: it's giving a side-effect gain based on a system that isn't designed to run at the highest efficiency in terms of power as it sits.