so you want a vvt cam swap?!?! - PerformanceTrucks.net Forums



GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

so you want a vvt cam swap?!?!

Reply
 
Thread Tools Search this Thread
Old 07-17-2012, 07:02 PM   #1
TECH Fanatic
Thread Starter
 
Join Date: Jul 2006
Location: K.C.
Posts: 1,737
Thanks: 0
Thanked 0 Times in 0 Posts
Default so you want a vvt cam swap?!?!

after doing a lot more digging than the average bear would do about this for two weeks, i have come to a conclusion. GM is very annoying.

Comp Cams tech bulletin.

GM introduced a second style VVT cam actuator (aka phaser) in 2007 and ran two different cam
actuators through 2007‐2008+. The new style became the exclusive unit in most 2009+ engines.
•Original (old style) GM Part #12585994: 2007‐2008 (uses cam core 156‐)
•Current (new style) GM Part #12606358: 2007‐2009+ (uses cam core 189‐). The difference in
camshaft core is the pin to centerline position.
The difference in the pin between 156 and 189 equates to 13 degrees cam retard (if a 156 is used
where a 189 is required).

upon more research, it all makes sense now, and how this bulletin comes into play. some may think "duh" and others will look at it and say, "well it makes sense now"

this is how it affects you and your part numbers.

on the front side of your cam actuator {phaser} there is a three digit number. 994, or 358. compare this to the numbers above and you will see where it comes into play it.

99% of the people will order a 156-40x-13 cam. then some will complain about a loss of low end torque and the sudden rush of top end. bells ringing yet? if they ordered a 189-40x-13 the torque would have cam up and the same about of top end would have been had with great midrange.

now there is a slight problem with ordering a 189 cam core. 9/10th of the time most vendors won't stock it because most go off the websites, and the 156 number comes up.

one vendor actually asks what year the engine is, and gets you the right phaser limiter and matching cam. TSP.

so when you want to order a vvt cam, make sure you are getting the right cam core, and phaser.



How to install the comp cams phaser limiter block courtesy of Sand Man
http://www.youtube.com/watch?v=Tsj4anpULX0

Last edited by Area47; 12-11-2012 at 06:00 PM.
Area47 is offline   Reply With Quote
Old 07-17-2012, 08:10 PM   #2
TECH Fanatic
 
NKPPhil's Avatar
 
Join Date: Jan 2011
Posts: 1,065
Thanked 0 Times in 0 Posts
Default

AWESOME analysis!

Your detective work might have just saved a few members from a lot of heartache, and explained a few ongoing problems for guys.
NKPPhil is offline   Reply With Quote
Old 07-18-2012, 12:45 AM   #3
14 Second Truck Club
iTrader: (3)
 
Join Date: Aug 2007
Location: Kansas
Posts: 295
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I laughed when I read this because I was just reading about a vvt swap in an s10 and was complaining about how he had no low end and then picked up at the top. Everyone there was stumped, I'll have to post this link. I'm going to go out on a limb and say this info should be a sticky.
20002wdchevy is offline   Reply With Quote
Old 07-18-2012, 01:19 AM   #4
Man Motor club
 
rjwz28's Avatar
 
Join Date: Jun 2007
Location: Sunniest city on Earth
Posts: 2,623
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I agree. Posted for the bookmark, thanks for the heads-up, now get a mod to stick it!
rjwz28 is offline   Reply With Quote
Old 07-18-2012, 02:46 AM   #5
11 Second Hall Moniter
iTrader: (22)
 
AKlowriderZ71's Avatar
 
Join Date: May 2008
Location: Wyoming
Posts: 11,645
Thanked 1 Time in 1 Post
Default

Stuck!

Thanks for the info!
AKlowriderZ71 is offline   Reply With Quote
Old 07-18-2012, 11:46 AM   #6
TECH Fanatic
Thread Starter
 
Join Date: Jul 2006
Location: K.C.
Posts: 1,737
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by 20002wdchevy View Post
I laughed when I read this because I was just reading about a vvt swap in an s10 and was complaining about how he had no low end and then picked up at the top. Everyone there was stumped, I'll have to post this link. I'm going to go out on a limb and say this info should be a sticky.
i ran into numerous threads in my search about that. the more i dug into it the more and more i saw a common problem.

YaY sticky!
Area47 is offline   Reply With Quote
Old 07-18-2012, 09:52 PM   #7
Tin Foil Hat Wearin' Fool
iTrader: (36)
 
1slow01Z71's Avatar
 
Join Date: Oct 2004
Location: Austin, TX
Posts: 23,200
Thanks: 0
Thanked 1 Time in 1 Post
Default

Another good thread from a couple weeks ago about the cam cores
To vvt or not to vvt - LS1TECH
1slow01Z71 is offline   Reply With Quote
Old 07-19-2012, 12:24 AM   #8
TECH Fanatic
Thread Starter
 
Join Date: Jul 2006
Location: K.C.
Posts: 1,737
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by 1slow01Z71 View Post
Another good thread from a couple weeks ago about the cam cores
To vvt or not to vvt - LS1TECH
thats one of the threads that spawned my information hunt. along with a whole crap load more of em in roughly the same content
Area47 is offline   Reply With Quote
Old 07-21-2012, 08:49 AM   #9
On The Tree
iTrader: (2)
 
Join Date: Dec 2011
Location: North East Ohio
Posts: 128
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Comp will have my custom grind 189 done next week and I should have it in shortly after that. I'll post the differences from the old "butt dyno" and data logger software.
Gus 82 is offline   Reply With Quote
Old 07-22-2012, 08:09 PM   #10
cam
TECH Addict
iTrader: (9)
 
Join Date: Apr 2004
Location: Toronto Ontario Canada
Posts: 2,373
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Mind sharing the specs on that cam Gus?
cam is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Ls3 swap into my 06 rcsb OHsixLS3 INTERNAL ENGINE MODIFICATIONS 14 12-27-2016 10:30 AM
Help with LQ4 swap in 91 Z71 RCSB GrooveCityZ71 GM Engine & Exhaust Performance 7 08-31-2015 01:05 PM
Need a couple cams ideas Matt331 INTERNAL ENGINE MODIFICATIONS 0 07-26-2015 10:40 PM
turbo cam question WICK3DxGATA FORCED INDUCTION 4 07-21-2015 07:59 PM
LQ9 Bolt ons (ls6 heads?) Aboss GM Engine & Exhaust Performance 7 07-09-2015 11:28 AM


Tags
18, 28, 53, afm, btw, cam, cost, crane, difference, gm, install, l99, problems, sticking, swap, vvt, whats

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 07:31 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: