Problem with Ram Air induction...
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 46
Likes: 0
From: Fort Worth TX
Problem with Ram Air induction...
I have a 2002 that I installed the Breathless Performance Ram Air induction system. The problem is since doing so the car will not coast smoothly between about 40-60 mph. It will have a slight erratic hesitation problem. It feels like tapping on the brakes or goosing the gas a bit. It is subtle but obvious. The dealer checked it out and said that because of this system the car was running lean and the computer was adjusting the fuel mixture by 5% and was causing the result. He stated he tried different fuel mixtures etc with no success and also stated it would not be a problem other than an annoyance. He also replaced the MAf to be sure it was not that. The only other engine mod I have is a Corsa exhaust and X pipe. All other aspects of the car are fine like acceleration and idle. Has any one had this problem and have a solution? I have a friend with the same setup and no issues but it is a 2004. Breathless can only offer reprogramming the chip and I would spend the $400 if I knew it would work. Thanks
Steve
Steve
Racer
Joined: Sep 2003
Posts: 490
Likes: 0
From: LaPLATA Md
I had described the same problem on a post a few months ago.I have a Granatelli cold air induction and had the same results.It annoys me but figured it was a cost of modding.Should be getting my car from ECS this week and hope it is better after the ls1 edit.
Burning Brakes
Joined: Sep 2003
Posts: 764
Likes: 0
From: South Florida
Don't give BPP $400 for tuning your PCM.
Don't drive at that rpm.
Wait until you do other mods and then find a local tuner that you can go to for hands on accurate tuning on a dyno!!!!
Just my 2 cents.
T
Don't drive at that rpm.
Wait until you do other mods and then find a local tuner that you can go to for hands on accurate tuning on a dyno!!!!
Just my 2 cents.
T
![[ Ls1 ]'s Avatar](https://www.corvetteforum.com/forums/images/avatars/69.jpg)
Intermediate
Joined: Jul 2004
Posts: 45
Likes: 0
turbulent air
the problem with ram air...is that air turbulence causes your maf to throw inconsistant readings...since ur a/f is always trying to balance the engine will not run as smoothly....my suggestion is that the jerking or dragging is usually only felt on deceleration or idle, however if u launch these draggin characteristics go away...pehaps you should find a way to restrict some of the air flow in the front...i know you can get covers for them.....
Safety Car
Joined: Mar 2002
Posts: 3,556
Likes: 2
I had the same problem with the same setup-until I changed it to the BW for other reasons.
I thought a simple fix would be to custom make a two-three inch extension from the MAF to the filter, giving the incoming air more of a chance to straighten the air out. It could probably use some type of airvane to help the MAF read better at low RPM's...
Oh, and any electronic tweaking will not work for this problem..
I thought a simple fix would be to custom make a two-three inch extension from the MAF to the filter, giving the incoming air more of a chance to straighten the air out. It could probably use some type of airvane to help the MAF read better at low RPM's...
Oh, and any electronic tweaking will not work for this problem..
Last edited by MiamiDave; Aug 10, 2004 at 10:09 AM.
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 46
Likes: 0
From: Fort Worth TX
I appreciate the feedback. I originally removed the screen (as their instructions suggested) from the MAF but found a thread saying you should not do that which is why I replaced the sensor and screen, but that did not make any difference. I also did not feel any electronic tweaking would solve the problem. Interesting thought about the cover but then would defeat the purpose of the additional air flow as I see it. The description of only being on deceleration is dead on. I was also thinking of going with BW but chose this route. Maybe time to switch if that solved the problem.
Is there any possibility that having kept the factory duct could exxagerate the problem? If I upgraded to a larger duct would it not relieve some of the back pressure to the MAF, therby reducing the turbulence at the MAF? Thank you all.
Is there any possibility that having kept the factory duct could exxagerate the problem? If I upgraded to a larger duct would it not relieve some of the back pressure to the MAF, therby reducing the turbulence at the MAF? Thank you all.
Melting Slicks
Joined: Sep 2003
Posts: 3,172
Likes: 4
From: Central Coast CA
Originally Posted by Southview
I had described the same problem on a post a few months ago.I have a Granatelli cold air induction and had the same results.It annoys me but figured it was a cost of modding.Should be getting my car from ECS this week and hope it is better after the ls1 edit.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Le Mans Master
Joined: Mar 2002
Posts: 8,466
Likes: 51
St. Jude Donor '17
Originally Posted by swin1
I appreciate the feedback. I originally removed the screen (as their instructions suggested) from the MAF but found a thread saying you should not do that which is why I replaced the sensor and screen, but that did not make any difference. I also did not feel any electronic tweaking would solve the problem. Interesting thought about the cover but then would defeat the purpose of the additional air flow as I see it. The description of only being on deceleration is dead on. I was also thinking of going with BW but chose this route. Maybe time to switch if that solved the problem.
Is there any possibility that having kept the factory duct could exxagerate the problem? If I upgraded to a larger duct would it not relieve some of the back pressure to the MAF, therby reducing the turbulence at the MAF? Thank you all.
Is there any possibility that having kept the factory duct could exxagerate the problem? If I upgraded to a larger duct would it not relieve some of the back pressure to the MAF, therby reducing the turbulence at the MAF? Thank you all.
I have the same air intake and no problems but i did have that kind of problem on a camaro with the maf screen removed. The screen kills the turbulance. You could have something on the filament on the maf if you replaced that. I know it is very very delicate but there is a way to clean it if something is on it that is causing temperature changes on the wire to be inaccurate. Maybe a possible air leak around it?
Instructor
Joined: Aug 2003
Posts: 233
Likes: 0
From: Batesville AR
hesitation/surge during cruise conditions
Swin1
I had the exact same problem on my 02 A4. Had the usual mods, LT's, stingers, donaldson BW. Then I installed a Halltech tunnel port, which opens up the license plate area as a direct air entry point. More air in , good right? WRONG Using the GM tech 2 scanner while driving in cruise conditions only, 30mph-80mph, The fuel trims and MAF readings were all over the scale. Maf readings shouldn't change more than tenth's of a gram of air flow but mine were changing 8-9 grams of flow.
The PCM was detecting a lean condition when there wasn't one, due to the air turbulence, and or the MAF getting more air than it needs and the excess air was screwing up the MAF parameters. Blocked off the license plate opening and the problem went away and the MAF and fuel trims went back to normal readings!!
One other note is that when you remove the screen in the MAF, which in 02 is the same MAF as the Z06, you need to download the Z06 MAF program as it is different than the LS1 with the screen
I had the exact same problem on my 02 A4. Had the usual mods, LT's, stingers, donaldson BW. Then I installed a Halltech tunnel port, which opens up the license plate area as a direct air entry point. More air in , good right? WRONG Using the GM tech 2 scanner while driving in cruise conditions only, 30mph-80mph, The fuel trims and MAF readings were all over the scale. Maf readings shouldn't change more than tenth's of a gram of air flow but mine were changing 8-9 grams of flow.
The PCM was detecting a lean condition when there wasn't one, due to the air turbulence, and or the MAF getting more air than it needs and the excess air was screwing up the MAF parameters. Blocked off the license plate opening and the problem went away and the MAF and fuel trims went back to normal readings!!
One other note is that when you remove the screen in the MAF, which in 02 is the same MAF as the Z06, you need to download the Z06 MAF program as it is different than the LS1 with the screen
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 46
Likes: 0
From: Fort Worth TX
Great feedback from all. Thanks. I did reset the computer so I feel that is not the problem. All in all it sounds as though I am not the only one that has experienced this. Interesting thought about the Z06 programming. Could be worth looking into. I was also getting the lean readings that did not exist. I will keep everyone posted if I ever figure it out.
