CAI Short vs. Long - 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 04-08-2003, 08:42 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2002
Location: Charlotte
Posts: 91
Thanks: 0
Thanked 0 Times in 0 Posts
Buddha Jones is on a distinguished road
Default CAI Short vs. Long

I am running a short intake on my car right now but am toying with the idea of making a long intake for my car. Thoughts, Opinions, Inputs??
Buddha Jones is offline   Reply With Quote
Old 04-09-2003, 12:00 AM   #2
Executed
 
Join Date: Sep 2002
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Pontiac1983 is on a distinguished road
Default

well I made a long intake after I had a short intake. I noticed that the car studders at very low speed when I hit the gas. I think the car may be getting too much air.
Pontiac1983 is offline   Reply With Quote
Old 04-09-2003, 01:41 AM   #3
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default CAI Short vs. Long

Underneath my airbox torwards the drivers side of my car there is a cylinder shaped thing with wires are crap going to it. If i moved this i'd have a hole big enough to run a cai tube from my tb to behind my fog light. I have no idea what this thing is(i need a manual bad) so i'm not to just go and move it. If i did though I could have a looong cai. Anyone know what i'm talking about?
95naSTA is offline   Reply With Quote
Old 04-09-2003, 02:16 AM   #4
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

Longer the better....

Try to locate the filter in the coolest location.
Insulate the pipe so it doesn't transfer heat to the air inside from that 600 F exhaust manifold.

If you go longer, increase the pipe size to 3.5" or 4" is better.
2000SilverBullet is offline   Reply With Quote
Old 04-09-2003, 10:17 PM   #5
Senior Member
Posts like a Camaro
 
Join Date: Jan 2002
Location: Simi Valley, CA
Posts: 971
Thanks: 0
Thanked 1 Time in 1 Post
99BonnevilleSE is on a distinguished road
Default

Quote:
Originally Posted by 2000SilverBullet
Longer the better....

Try to locate the filter in the coolest location.
Insulate the pipe so it doesn't transfer heat to the air inside from that 600 F exhaust manifold.

If you go longer, increase the pipe size to 3.5" or 4" is better.

He has a 97 SE, that would hurt his performance. Trust me, N/A cars require much different tuning than the */C tuning you are thinking of.
99BonnevilleSE is offline   Reply With Quote
Old 04-09-2003, 11:28 PM   #6
Senior Member
True Car Nut
 
Join Date: Jun 2002
Location: Bedroom, Ontario
Posts: 3,266
Thanks: 0
Thanked 0 Times in 0 Posts
Drifter420 is on a distinguished road
Default

So for */C cars.. the longer and wider the intake.. the better?? How come ?? Sorry kinda dumb in this since I thought other then the fact that longer would cause more drag in the air ( like suckin on a longer straw ) and that wider would then maybe take out the drag? And the fact that longer would make the air entering more linear ? Help.. need help in understanding..

Quote:
Originally Posted by jr3800
That would be the Charcoal Canister... It is part of the EVAP system... Emmissions control item...
That'* what it is.. I too have thought of seeing if I can relocate that elsewhere since I thought about doing FAI ( Fenderwell Air Intake system ) through there or running to the fog lights too.. humm... does the canister NEED to be there ? As far as position ?
Drifter420 is offline   Reply With Quote
Old 04-09-2003, 11:52 PM   #7
Senior Member
Posts like a Camaro
 
Join Date: Jan 2002
Location: Simi Valley, CA
Posts: 971
Thanks: 0
Thanked 1 Time in 1 Post
99BonnevilleSE is on a distinguished road
Default

For */C cars, it doesn't really matter the size of the intake as long as it can feed enough air to the */C which is hard to do unless you use a really small pipe size. Since the car is affected by the blower and not vacuum, it doesn't matter the size or length, just is there enough air to feed the blower.

For N/A cars they are affected by vacuum and having too big a intake pipe will bog the car down by developing no air speed and not letting the car "suck" the air into the cylinders using the vacuum but have to hope it will go in. The factory piece is meant for silence which means restriction which is perfect. But when you change it out for a smooth pipe, it goes into different characteristics. Think of it as trying to drink through a straw some soda. Now take a 3" drain pipe and try to drink that soda again. Same thing with the engine but even a 3" to 3.5 or 4" pipe is that big of a difference to an engine. Air flow is everything, if you don't get it in and out properly, you lose effeciency and you actually hurt your HP and Torque.

Basically N/A cars and */C cars have totally different tuning theories.
99BonnevilleSE is offline   Reply With Quote
Old 04-10-2003, 12:49 AM   #8
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default CAI Short vs. Long

Quote:
Originally Posted by 99BonnevilleSE
For */C cars, it doesn't really matter the size of the intake as long as it can feed enough air to the */C which is hard to do unless you use a really small pipe size. Since the car is affected by the blower and not vacuum, it doesn't matter the size or length, just is there enough air to feed the blower.

For N/A cars they are affected by vacuum and having too big a intake pipe will bog the car down by developing no air speed and not letting the car "suck" the air into the cylinders using the vacuum but have to hope it will go in. The factory piece is meant for silence which means restriction which is perfect. But when you change it out for a smooth pipe, it goes into different characteristics. Think of it as trying to drink through a straw some soda. Now take a 3" drain pipe and try to drink that soda again. Same thing with the engine but even a 3" to 3.5 or 4" pipe is that big of a difference to an engine. Air flow is everything, if you don't get it in and out properly, you lose effeciency and you actually hurt your HP and Torque.

Basically N/A cars and */C cars have totally different tuning theories.
so on a n/a engine what is an ideal diameter size? also, how long is too long and how short is too short?
Another idea i had was to get one of those inverted hood scoops installed. should i have it closer to the tb or keep it up front near where the air box is(to reduce turbulence)? i would install an elbo with a cone filter if i did this.
95naSTA is offline   Reply With Quote
Old 04-10-2003, 02:46 AM   #9
Senior Member
Posts like a Camaro
 
Join Date: Jan 2002
Location: Simi Valley, CA
Posts: 971
Thanks: 0
Thanked 1 Time in 1 Post
99BonnevilleSE is on a distinguished road
Default

Depends on the N/A engine but 3" is the simplest size to work with. Length depends on how much bend you have in the pipe but each car is different. It'* trial and error to figure out too short is too short and too long is too long. Too short would be attaching a cone to just the throttle body or just a quick 6" bend in pipe with a cone. That is way too short and hurts performance. But a pipe can be too long. If you have it do tons of twists and turn, make it more difficult sometimes for the engine to pull the necessary air it requires. As for your hood scoop, I would have to see it. It'* different for each setup.
99BonnevilleSE is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
If you have a long way to go and a short time to get there.. petraman Lounge 14 05-02-2008 05:24 PM
Low oil pressure wasn't really. Long and short use AC/Delco jebstuart 1992-1999 3 04-24-2008 04:59 PM
Long and Short Term Fuel Trim Question mnuttall 1992-1999 15 11-17-2006 03:08 PM
Long start, short start, long stall, short stall :-( jessie_harbin 1992-1999 3 03-12-2006 11:40 AM
I'm back, and it's been a long, long time. tutu67 Lounge 1 10-23-2003 09:50 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 12:17 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.