Flutter
Flutter ok just got the car running again from being down about 8 months. Take it out and I hear this flutter sound. I'm thinking it's compressor surge. It's a 98 camaro with a d1sc was tuned for 5 lbs of boost, while it was down I changed the pulley to a smaller pulley
Would this cause that? It's running I believe 9 lbs now. I have checked the plumbing to the BOVs grey seem to be working on and off. They are Tial Q 50mm and I'm running 2. What else to check? Could it be the BOV because it's not a bypass valve?
Would this cause that? It's running I believe 9 lbs now. I have checked the plumbing to the BOVs grey seem to be working on and off. They are Tial Q 50mm and I'm running 2. What else to check? Could it be the BOV because it's not a bypass valve?
TECH Enthusiast
Joined: Oct 2007
Posts: 530
Likes: 2
From: South Lyon, Michigan
put a gauge on the vacuum source and make sure that they're getting adequate vacuum. Make sure the o ring at the bottom of the piston or the seal for the BOV to the charge pipe didn't get pinched.
Just curious to why you need 2 valves? One should be adequate, what spring is in the valve?
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
It's simple.
Are your BOV's open at idle ?
If not, then chances are they are not appropriate for your application. Use something intended for a supercharger application or if you can alter/swap internal springs to allow it to open more easily, try that.
Are your BOV's open at idle ?
If not, then chances are they are not appropriate for your application. Use something intended for a supercharger application or if you can alter/swap internal springs to allow it to open more easily, try that.
Where are you sourcing vacuum from?
put a gauge on the vacuum source and make sure that they're getting adequate vacuum. Make sure the o ring at the bottom of the piston or the seal for the BOV to the charge pipe didn't get pinched.
Just curious to why you need 2 valves? One should be adequate, what spring is in the valve?
put a gauge on the vacuum source and make sure that they're getting adequate vacuum. Make sure the o ring at the bottom of the piston or the seal for the BOV to the charge pipe didn't get pinched.
Just curious to why you need 2 valves? One should be adequate, what spring is in the valve?
Trending Topics
Yes they are open at idle. I have the lightest spring in there. The just don't close all the way once it goes into boost
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo 9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
IMO buy something from Vortech, or Procharger that is designed for the your usage.
ALthough the actual could depend on the noise you're hearing.
Valve open under load, certainly not good for performance etc.....but lots of fluttering from a valve never opening could be harmful to the blower, although this would be more apparent coming down the rpm with your foot off the throttle.
ALthough the actual could depend on the noise you're hearing.
Valve open under load, certainly not good for performance etc.....but lots of fluttering from a valve never opening could be harmful to the blower, although this would be more apparent coming down the rpm with your foot off the throttle.
TECH Enthusiast
Joined: Oct 2007
Posts: 530
Likes: 2
From: South Lyon, Michigan
Not opening would cause compressor surge/flutter, not closing would not make any boost or very little for that matter.
open at idle is normal, should shut when you crack the throttle.
I see maybe they don't open quick enough? I posted a video
Ok so at idle valves are open you can hear them pushing air when I get on throttle. They close its builds boost when I shift gears. Letting off throttle to go into next gear that's when it happens only in the higher rmp range 4k that's the highest I took it. Then it made that flutter.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
So you are not venting enough air.
Simple solution, fit a valve that is intended for the application, and ensure any pipework leading to it is adequate.
The Tial at 50mm should be ok...so maybe it isnt opening at all even though you think it is ?
Simple solution, fit a valve that is intended for the application, and ensure any pipework leading to it is adequate.
The Tial at 50mm should be ok...so maybe it isnt opening at all even though you think it is ?
When it's running I can see them open. When I have someone hit the throttle they start closing. I have 2 tial so it should be venting enough air?
Ok I'll go over everything again and see what's going on. I'm going to put a gauge on it see what it's reading
TECH Enthusiast
Joined: Oct 2007
Posts: 530
Likes: 2
From: South Lyon, Michigan