Results 11 to 20 of 21
Thread: under drive pulleys
11-06-2010, 12:04 PM #111988 Chevy C-3500 2wd (no pic)
350 c.i. 5.7 L Stock Block, 4 Bolt Mains
L-31 Vortec Heads, Edelbrock Cam & Intake,
Holley 650, Flowtech Headers, Magnaflow exh.
Jet Trans 700R4, B&M Ratchet, 4:10 gears,
3" susp. lift kit "shadetree"
No rev limiter, No speed limiter lol
11-06-2010, 12:22 PM #12
Ijust looked up March pullys and they do not make any pullys for anything newer than a 2003 Chevy, so I am still looking.2005 Chevy Silverado 1500 Z71 Crew Cab
8in ProComp Suspension Lift, 4in Shackle Flip Kit, 3in Performance Products Body Lift, 17x9 Moto Metal wheels, 35x12.50x17 ProComp Xterrains, K&N cold air intake kit, Custom 3in exhaust, GoRhrino Black spring loaded steps, Truxedo Bed Cover, "SS" style Instrument Cluster with blue pointers and Trans Temp Gauge, JVC indash touchscreen DVD player, 2 MTX 10in subwoofers, Sony Xplode 1000watt amp, Radio Shack CB with dual black whips, Optima yellow top battery
11-06-2010, 12:49 PM #13
11-09-2010, 10:06 AM #14
take it from me i have a pulley kit on my truck and there is no noticeable difference in power gains.... i am a fan of every little bit helps but the pulley kit has been worth it... i should have bought headers and a y-pipe... basically i have had alot of issues with them so far2000 single cab short bed 1500 w/ 6.0 vortec maxx swap from a 2006 2500, custom intake, slotted brakes, shorty headers, 8mm wires, electric fan, strait piped, 4.5 inch lift, asp pulleys, true dual through body exhaust, built trans w/ shift kit, custom tune ... 320rwhp
11-09-2010, 02:27 PM #15
It was worth 3/4 - 1 mpg on mine & I can actually feel it accelerates a little easier from 800 up to about 2,000 rpms. Beyond 2k rpms it gets lost in the shuffle. I agree you would have gotten more return with headers & a Y pipe, since the exhaust is the weakest point on Chevy small blocks & is usually the first thing replaced. I would not recommend underdrive pulleys for anyone who has had overheating problems or a zillion watt stereo, or as a first mod, but as a final mod after everything else has been done to improve performance & mpg. Some people can live with them & some can't. What issues have you had with yours other than the low voltage at idle?? Are yours the aluminum pulleys or steel?
I have noticed 8Volts @ idle on mine but have not experienced any low charging of the battery as I don't spend much time ar idle. Do you do a lot of stop & go driving or get stuck in traffic jams a lot?
Last edited by stephan; 11-09-2010 at 03:01 PM.
11-09-2010, 02:59 PM #16
This post has been rated MA LSV, and is intended for mature audiences. Reader discretion is advised. :fighting0037:
- Join Date
- Nov 2009
- Seward, Nebraska, United States
- Blog Entries
ghst-_-R3CON83 ----------BATTLEFIELD BAD COMPANY 2----------------------
(This site won't let me add a real stat generator to my signature)
11-10-2010, 09:38 PM #17
- Join Date
- Nov 2010
Do underdrive pulley's increase MPGs?
11-11-2010, 12:03 AM #18
Yes, according to the laws of physics, they have to improve mpg, but you can do something else to your engine at the same time that takes mpgs' away & you'd never know. That is why you only want to change one thing at a time for testing purposes.
11-11-2010, 04:10 PM #19
I try to stay away from the city, most of my driving is done on the highway. I just feel that I could have spent the money on something with more power gains. But as far as the volts go im running about the same at an idle.
11-11-2010, 07:13 PM #20
- Join Date
- Nov 2010
By Jarrett in forum GM PowertrainReplies: 5Last: 02-21-2010, 07:40 AM
By Silverado Junkie in forum General Chevy & GM Tech QuestionsReplies: 0Last: 02-16-2010, 10:54 AM
By doublej in forum General Chevy & GM Tech QuestionsReplies: 11Last: 07-16-2009, 12:33 PM
By blacksilverado07 in forum Performance & FuelReplies: 3Last: 11-28-2008, 09:39 PM
By wailalghanim in forum Chevy Silverado Forum (GMC Sierra)Replies: 3Last: 06-30-2008, 01:48 AM
Tags for this Thread