underdrive pulley feedback - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

cipriank · 07-29-2013, 10:12 PM

can anyone tell me how different the car drove after the under drive pulley install? noticeable improvement ?

SSMickey · 07-29-2013, 10:27 PM

I consider a UDP one of those since I'm in here mods to do when you do a cam. I don't feel the return is worth the trouble unless you already have a reason to have the factory pully off. Car is not going to drive differently, but the butt Dyno might be able to feel it a little. Don't even waste your money on a 10% UDP, get a 25% one.

TXM62SS · 07-30-2013, 05:50 AM

I agree with Mickey. Only bother with it if you are doing something else that requires the labor to pull the old one off. My car drives fine with it. Zero problems.

Jason 98 TA · 07-30-2013, 10:52 AM

We typically see 8 rwhp from a pulley install.

Hang tight, we are finishing up a run of TSP's new underdrive pullies & I promise the price will be nice!

Kelly@PCMofNC · 07-30-2013, 12:22 PM

Quote:

Originally Posted by SSMickey

I consider a UDP one of those since I'm in here mods to do when you do a cam. I don't feel the return is worth the trouble unless you already have a reason to have the factory pully off. Car is not going to drive differently, but the butt Dyno might be able to feel it a little. Don't even waste your money on a 10% UDP, get a 25% one.

Agreed!

Nightmare2012 · 07-30-2013, 12:46 PM

Quote:

Originally Posted by Jason 98 TA

We typically see 8 rwhp from a pulley install.

Hang tight, we are finishing up a run of TSP's new underdrive pullies & I promise the price will be nice!

Do you got a projected time when it'll be out? I'm about to order my long block from you guys and would like an under drive pulley very much to go with it.

Rhino79 · 07-30-2013, 12:57 PM

It will rev quicker, and yes pickup 7-8 hp/tq

Bell040 · 07-30-2013, 01:02 PM

but if you stall in parking lots when taking tight turns at low rpm (like I do because of having a big cam)... an underdrive pulley will make it worse (reduced power steering pump power).

Camarojt · 07-30-2013, 01:38 PM

On my car, I noticed that if I sit in the parking lot at work like I sometimes do at lunch, it will go into Battery Saver mode on the DIC and the AC will reduce power. But I'm a bit different, due to the fact that most of my driving is under 35 mph commute to and from work so rpms dont turn that high to charge the battery. Not to mention I have a BIG A$$ stereo system with 2 BIG AMPS.

Pro Stock John · 07-30-2013, 02:17 PM

Your stereo is most likely the culprit, I commute today I never went above 30 mph. I have 9,000 miles on my 25% underdriven pulley, trouble lights or battery issues. I did 3 other mods at the same time so can't comment on the performance.

LeanPocket · 07-30-2013, 02:51 PM

its about 8-12 hp and about .1 off the 1320' for 300$.. if u can justify that, then I say its well worth it.

TXISKING · 07-30-2013, 04:04 PM

Does the 8-12 hp numbers increase to a bigger number, if you have done heads and cammed already? Or is it a static number?

SSDan · 07-30-2013, 05:25 PM

Quote:

Originally Posted by TXISKING

Does the 8-12 hp numbers increase to a bigger number, if you have done heads and cammed already? Or is it a static number?

A UD pulley doesn't cause a gain in HP as much as it reduces parasitic loss from spinning the accessories 25% slower. So my guess is the 7-8 HP is a static number.

For those with cams and stalling and/or charging issues - might the idle be too low more so than impact from a UD pulley?

OP - I did my UD pulley with the cam swap. As others have said I can't recommend it as a stand alone mod.

MarylandSpeed · 07-30-2013, 05:35 PM

I would not do a pulley unless I was doing a cam. The install is a pain on it's own for the little bit of gain you get. Thanks!

07-29-2013, 10:12 PM	#1
cipriank Drives: 2010 camaro 2ss Join Date: Feb 2011 Location: boca raton, fl Posts: 247	underdrive pulley feedback can anyone tell me how different the car drove after the under drive pulley install? noticeable improvement ? __________________ 2010 2ss L99 Mods: ADM race intake, ADM scoop w/ washer bottle, SLP long tube headers, SLP 25% UDP, SLP Loud Mouth 2 exhaust, Vmax TB, BER intake manifold,3.45 gears, MSD wires, SLP 160 t-stat, SLP Springs, EFI live tune by Redline Motorsports

07-29-2013, 10:27 PM	#2
SSMickey Drives: 2010 IBM 2SS Join Date: Feb 2010 Location: Columbia S.C. Posts: 1,455 View My Garage	I consider a UDP one of those since I'm in here mods to do when you do a cam. I don't feel the return is worth the trouble unless you already have a reason to have the factory pully off. Car is not going to drive differently, but the butt Dyno might be able to feel it a little. Don't even waste your money on a 10% UDP, get a 25% one. __________________ ProCharger P1X, Vengeance Racing Kaotic Cam, ARH Headers and Exhaust with Borla ATAK mufflers, MGW Shifter, MTI Drop Springs, Forgeline RB3C Wheels, 3.91 gears, Night Owl LED Control System

07-30-2013, 05:50 AM	#3
TXM62SS Drives: 2012 2SS/RS LS3 Join Date: May 2012 Location: Pearland, TX Posts: 388	I agree with Mickey. Only bother with it if you are doing something else that requires the labor to pull the old one off. My car drives fine with it. Zero problems. __________________ Victory Red 2012 2SS/RS LS3 Camaro Pat G. Spec Cam from Cam Motion 228/236 .599/.599 112+2LSA Kooks 1-7/8" LTs w/ Cats Roto-Fab, Bo White TB, Borla Touring Catback 3.91 1LE Gears, MGW Tuned by Pat G

07-30-2013, 01:02 PM	#8
Bell040 Drives: 2SS/RS - Black - GFX Join Date: Nov 2008 Location: B'ham, Alabama Posts: 2,458 View My Garage	but if you stall in parking lots when taking tight turns at low rpm (like I do because of having a big cam)... an underdrive pulley will make it worse (reduced power steering pump power). __________________ Ordered: 10-13-08 Built: 3-30-09 (#1691) Recieved: 6-12-09 Blacked out, Cammed (Lunati Voodoo 233/245, .578/.598 @114°, +4°), ARH LTs, VR OTR CAI, Cutouts, and lots of other fun mods.

07-30-2013, 02:17 PM	#10
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	Your stereo is most likely the culprit, I commute today I never went above 30 mph. I have 9,000 miles on my 25% underdriven pulley, trouble lights or battery issues. I did 3 other mods at the same time so can't comment on the performance. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

07-30-2013, 10:52 AM	#4
Jason 98 TA Drives: Camaro Join Date: Apr 2009 Location: Texas Posts: 1,669	We typically see 8 rwhp from a pulley install. Hang tight, we are finishing up a run of TSP's new underdrive pullies & I promise the price will be nice!

07-30-2013, 12:57 PM	#7
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	It will rev quicker, and yes pickup 7-8 hp/tq

07-30-2013, 01:38 PM	#9
Camarojt Drives: 2011camaro SS Join Date: Nov 2012 Location: Allen, Tx Posts: 2,202	On my car, I noticed that if I sit in the parking lot at work like I sometimes do at lunch, it will go into Battery Saver mode on the DIC and the AC will reduce power. But I'm a bit different, due to the fact that most of my driving is under 35 mph commute to and from work so rpms dont turn that high to charge the battery. Not to mention I have a BIG A$$ stereo system with 2 BIG AMPS.

07-30-2013, 02:51 PM	#11
LeanPocket Drives: 2010 2SS Join Date: Jan 2013 Location: Corpus Christi TX Posts: 634	its about 8-12 hp and about .1 off the 1320' for 300$.. if u can justify that, then I say its well worth it. __________________ Build Thread

07-30-2013, 04:04 PM	#12
TXISKING Drives: '13 ZL1 725 rwhp / 700 ft lb tq Join Date: Jul 2009 Location: Andrews, Texas Posts: 165 View My Garage	Does the 8-12 hp numbers increase to a bigger number, if you have done heads and cammed already? Or is it a static number? __________________ '13 Black Manual trans , Heads, Cam, Injectors, Ported Snout, Vmax throttle body, RotoFab, Headers, No Cats, 9.55 lower pulley, D3PE heat exchanger, - 725 rwhp/700 tq

07-30-2013, 05:35 PM	#14
MarylandSpeed Account Suspended Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 3,378	I would not do a pulley unless I was doing a cam. The install is a pain on it's own for the little bit of gain you get. Thanks!