Upgrade questions (valvetrain, pcm related) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 12-28-2007, 01:22 AM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jun 2007
Location: Chambersburg, Pennsylvania
Posts: 882
Thanks: 0
Thanked 0 Times in 0 Posts
putertopia is on a distinguished road
Default Upgrade questions (valvetrain, pcm related)

So I've ported the LIM, I've drilled/gutted the stock airbox and threw in a K&N drop in filter. The next mod will be actually installing my flowmaster 80 & magnaflow cat. After that, I plan on going to autozone sometime and constructing a rice pipe w/ K&N 4750 and heat shield. Then... Intense PCM. Ok, so I have that laid out, but what to do after all of that?

I'm thinking valvetrain. I just recently actually started thinking about it and understanding how it could benefit, because that always dumbfounded me before. Then I realized, oh yeah, that would probably increase valve clearance, resulting in more air flow, something that engines like.

So if I were to upgrade stuff valvetrain side of the motor, would I really benefit? I'm tired of not being able to really pass people between 40-50 MPH. I wait until I'm up to 55 MPH, then really gas it to get around them. I'm talking about those annoying people that get on the highway, run the ramp @ 40 mph the whole way onto the highway, then take a mile to get up to highway speed (60 mph for them) once already entered on the highway. I'm in a community full of older retired people, so that happens quite a bit. Not that I want to be an aggressive driver, but more like a driver with the power to get in the fast lane and increase my speed to 65-75 from 40 mph so people in the fast lane won't have to brake.

Is it expensive? Is it something I could do myself? I've done many intakes, but I've really not gone beyond changing the valve cover gaskets. I'd like to cam it, but meh, I KNOW that'* expensive and can get complicated. I'd rather have an ssei and do that.

This may not happen until like mid-late 08', but it'* something I'd like to do. I'm addicted!

As far as the PCM goes, what should I order? Stock WOT timing? I would imagine, being that it'* N/A. I am going to do the 6,000 RPM shift points for sure.

I think this is all spawning off the video I saw after jr's3800 ported his LIM lol. I want that...
putertopia is offline   Reply With Quote
Old 12-28-2007, 01:54 AM   #2
Senior Member
True Car Nut
 
Join Date: Mar 2005
Posts: 2,688
Thanks: 0
Thanked 0 Times in 0 Posts
dillcc is on a distinguished road
Default

The muffler won't gain you any performance, but you may improve from the cat - especially if you threw on some higher ratio rockers. I don't have any personal experience, but NA people seem to like the ER rockers. Search on those if you haven't already. Be prepared to spend a few hundred bucks for rockers. Get a 180* T-stat if you don't have one yet. For the PCM, an Intense unit with the 6000 shift points would work well with a high flow cat and rockers. I don't think I'd bump timing though. I've heard it works better for boosted cars. I tried it on my '97 L36 using 93 octane and can't say I noticed much if any improvement.

Taking a step back though, it sounds like your car might not be in top shape to begin with if you're having trouble passing people. My stock car passed anyone quite well. Have you done the basics including plugs and wires?
dillcc is offline   Reply With Quote
Old 12-28-2007, 02:15 AM   #3
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jun 2007
Location: Chambersburg, Pennsylvania
Posts: 882
Thanks: 0
Thanked 0 Times in 0 Posts
putertopia is on a distinguished road
Default

Yep... full tune up. I can pass... just not as quickly some everyday cars can. Then again... I've been driving w/ a 2.86 geared trans being run by a 3.06 pcm lol. But thats being fixed right now. I know the muffler won't do anything... but I dig the sound.
putertopia is offline   Reply With Quote
Old 12-28-2007, 12:07 PM   #4
Senior Member
Posts like a Camaro
 
Join Date: Oct 2006
Location: montreal canada NEBF07 ONBF07
Posts: 987
Thanks: 0
Thanked 0 Times in 0 Posts
firebuick is on a distinguished road
Default

the ER rockers are good but they did not do any good on my car until i got the 2.5 inches downpipe so don't forget the downpipe
firebuick is offline   Reply With Quote
Old 12-28-2007, 08:28 PM   #5
Senior Member
Posts like a Turbo
 
Join Date: Sep 2007
Location: Saginaw, MI
Posts: 345
Thanks: 0
Thanked 0 Times in 0 Posts
TheDude is on a distinguished road
Default

After my tranny build, I cut about 1.5 seconds off my 40-70mph WOT times. I have some home-done modifications to the runners in my UIM and felt a noticable difference at 4000+ RPM. All my engine mods were done at the same time so I cant tell you what made the most difference. But I did swap a stock UIM back on and ended up putting my modified UIM back on because it was much more responsive
TheDude is offline   Reply With Quote
Old 12-28-2007, 09:50 PM   #6
Senior Member
Posts like a Camaro
 
Join Date: Oct 2006
Location: montreal canada NEBF07 ONBF07
Posts: 987
Thanks: 0
Thanked 0 Times in 0 Posts
firebuick is on a distinguished road
Default

[quote] have some home-done modifications to the runners in my UIM and felt a noticable difference at 4000[quote]



what did you do and do you have pict of that mod
firebuick is offline   Reply With Quote
Old 12-28-2007, 10:16 PM   #7
Senior Member
Posts like a Turbo
 
Join Date: Sep 2007
Location: Saginaw, MI
Posts: 345
Thanks: 0
Thanked 0 Times in 0 Posts
TheDude is on a distinguished road
Default

I cut about a 1.5" square section out of each runner and cleaned up the excess material around the edges. It pulls much harder in the higher RPM. And there was definately no loss of low end. Best part about it, FREE. Well, you may want to replace the injector o-rings and UIM gasket if they are old. I have some pictures and videos on my cellphone, but no way to transfer to my PC or email. I can send them via video messenging to you if you can figure out how to post them.
TheDude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Headers w/ stock valvetrain or cam Allmachtige Performance, Brainstorming & Tuning 11 10-05-2007 07:44 AM
L36: Valvetrain upgrades needed for 1-2 shift point of 6250? agrazela Performance, Brainstorming & Tuning 15 04-12-2007 02:34 PM
what would cause valvetrain to be i diffrent condition ZCRX87 1992-1999 3 04-07-2006 12:50 AM
PCM Learning related to pulley swap 2000SilverBullet Performance, Brainstorming & Tuning 22 03-08-2006 02:31 AM
Valvetrain ideas? BonneMeMN Performance, Brainstorming & Tuning 2 02-09-2005 10:36 AM


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 -4. The time now is 10:21 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.