CAI benefit negated by PCM? - 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 06-23-2004, 12:52 AM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Nov 2003
Location: Boston, MA
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
bigJ is on a distinguished road
Default CAI benefit negated by PCM?

I read somewhere on the internet that unless you have a chip, the benefit of a cold air intake will eventually go away as the PCM learns the new parameters and adapts. Is there any truth to this? If so, would a high-flow exhaust help the situation?

Jeremy
bigJ is offline   Reply With Quote
Old 06-23-2004, 01:24 AM   #2
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

A learnable PCM will learn that the air is colder and advance timing and things for the good. Its the resister trick that fools the IAT into thinking its colder out when its not that will be unlearned by a learnable PCM. The resistor trick fools the PCM into thinking air is colder so the pcm supplys more fuel, however once the pcm learns its fat by the 02 readings it pulls fuel again. With a CAI the colder air is ACTUALLY colder so you will just reap benifits from it.
Rogue is offline   Reply With Quote
Old 06-23-2004, 02:02 AM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I'll back Rogue up 100%. The resistor is bought by fools. The CAI is installed by people who know. And the results back us up.
willwren is offline   Reply With Quote
Old 06-23-2004, 02:12 AM   #4
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Nov 2003
Location: Boston, MA
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
bigJ is on a distinguished road
Default

Cool beans... thanks for clarifying!
bigJ is offline   Reply With Quote
Old 06-23-2004, 02:14 AM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

No prob. Any vehicle will benefit from a CAI, but MAKE it a true CAI. An exposed cone is killing you. Better than stock? Yes. As good as it can get? NO.

And the bobbing head dalmation is another 5hp.

Welcome to the club!
willwren is offline   Reply With Quote
Old 06-23-2004, 02:38 AM   #6
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Nov 2003
Location: Boston, MA
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
bigJ is on a distinguished road
Default

I do plan on making the cold air box... just haven't gotten around to it. I'll probably wrap the crosspipe too. I just got laid off last week so now I have PLENTY of time for the Bonnie! Don't worry it'* all good - 7 months severence + benefits.

And yes, the Dalmation adds 5HP... at the wheels!

Jeremy
bigJ is offline   Reply With Quote
Old 06-23-2004, 04:25 AM   #7
Senior Member
Posts like a Supercharger
 
Join Date: Jun 2004
Location: belton,sc
Posts: 162
Thanks: 0
Thanked 0 Times in 0 Posts
master3rd is on a distinguished road
Default

Does the air box really help that much? I just got my CAI in the mail and haven't got it on the car yet. I've got a SE non super charged (Dang it) I'm just asking how much the air box will benefit?
master3rd is offline   Reply With Quote
Old 06-23-2004, 10:40 AM   #8
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

About 1% horsepower gain for each 10 colder the incoming air is. That'* pretty significant.
willwren is offline   Reply With Quote
Old 06-23-2004, 10:53 AM   #9
Member
Posts like a V-Tak
 
Join Date: Feb 2004
Location: KANSAS CITY MISSOURI
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
whw97ville is on a distinguished road
Default

Just curious.

Has anyone with the CAI & box ever put a temp gauge at the inlet to see what the temp diff is verus and open setup or stock box.

I've also been thinking (adjust me as need be)....
If you have the stock air box (gutted of course) and the box draws from behind the headlight (yes rerouting would be better) wouldn't the stock box (if rapped in a heat relective tape) be just as good as the CAI & box. It'* drawing cool air (and actually with the size of the box you should have an air reserve - being it was ramed in quick enough)
and as long as you remove the turbulence by replace that silly according duct you should be good and the rplacment K&N filter.

Thoughts, rebukes?
whw97ville is offline   Reply With Quote
Old 06-23-2004, 10:58 AM   #10
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

I think the cone flows better than the stock rectangle sized filter. If you could mount a 9 inch cone in a gutted airbox wrapped in heat tape and had the stock tubing replaced, yes i think it would do the same thing. (although probably not sound as cool)
Rogue is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
L36 Heads; cost/benefit for machine shop work... agrazela Performance, Brainstorming & Tuning 7 04-24-2007 10:05 PM
IAT relocating benefit??? toastedoats Performance, Brainstorming & Tuning 3 05-31-2006 02:22 PM
Does heatwrapping the CAI benefit the N/A? PRD2BDF Performance, Brainstorming & Tuning 13 03-28-2006 02:24 PM
Serie 2 piston oversizing ...benefit?? mike_peperni Performance, Brainstorming & Tuning 9 03-05-2006 09:46 AM
Toronto Benefit Concert..have you seen this??? Jim W Lounge 30 08-03-2003 09:30 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 07:46 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.