Exhaust bypass question
#5
Thanks for the diagram!
So when the fuse is removed it is my understanding that the valve is fully open at all times? Is that correct? I have my fuse removed and My only concern is at idle... On cold start it sounds fabulous! But once it warms up it quiets down... Any idea how I can get a healthy rumble at warm idle? I know the revs change a little when warm but it still seems like the exhaust becomes more silent somehow...
So when the fuse is removed it is my understanding that the valve is fully open at all times? Is that correct? I have my fuse removed and My only concern is at idle... On cold start it sounds fabulous! But once it warms up it quiets down... Any idea how I can get a healthy rumble at warm idle? I know the revs change a little when warm but it still seems like the exhaust becomes more silent somehow...
#6
When you first start your car there is no vacuum to close the valve so you get the nice growl. But it fades as vacuum builds and the valve closes. Edited - had it bass ackwards
Last edited by Old phart; 01-16-2016 at 04:10 PM.
#7
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#9
The fuse runs a vacuum pump, which creates the vacuum for the valve's to close. Engine vacuum is not run to the rear to operate the valve's..aka the fuse = the pump.
When you first start your car, your in cold start operation..its a higher rpm and different afr.
Once the engine is warm your back to commanded lambda 1 and a lower RPM idle @750rpm(actually it's 736rpm, but no one's complaining)... This creates the quieter sound.
If you want louder, an aftermarket muffler and cats are gonna be on your wish list! ;-)
When you first start your car, your in cold start operation..its a higher rpm and different afr.
Once the engine is warm your back to commanded lambda 1 and a lower RPM idle @750rpm(actually it's 736rpm, but no one's complaining)... This creates the quieter sound.
If you want louder, an aftermarket muffler and cats are gonna be on your wish list! ;-)
__________________
__________________
Technical Director
Christopher Edgett
Velocity Automotive Performance Limited
214 Maple Ave.
Oliver, B.C
Canada V0H 1T9
Office: (1)250-485-5126
Email: Tuning@VelocityAP.com
www.velocityap.com
__________________
Technical Director
Christopher Edgett
Velocity Automotive Performance Limited
214 Maple Ave.
Oliver, B.C
Canada V0H 1T9
Office: (1)250-485-5126
Email: Tuning@VelocityAP.com
www.velocityap.com
#10
Thanks Irish!
I already have the 100 Cell sport cats. - sounds like from your advice there is noting I can do other than free up the exhaust more? - I enjoy the sound now with the exception of warm idle. In the future I only intended to do headers so I could increase power and a rear silencer to reduce weight but was concerned I would get too loud on open throttled for my taste.
I already have the 100 Cell sport cats. - sounds like from your advice there is noting I can do other than free up the exhaust more? - I enjoy the sound now with the exception of warm idle. In the future I only intended to do headers so I could increase power and a rear silencer to reduce weight but was concerned I would get too loud on open throttled for my taste.
Last edited by Montana107; 01-17-2016 at 03:04 AM.
#11
Thanks Irish!
I already have the 100 Cell sport cats. - sounds like from your advice there is noting I can do other than free up the exhaust more? - I enjoy the sound now with the exception of warm idle. In the future I only intended to do headers so I could increase power and a rear silencer to reduce weight but was concerned I would get too loud on open throttled for my taste.
I already have the 100 Cell sport cats. - sounds like from your advice there is noting I can do other than free up the exhaust more? - I enjoy the sound now with the exception of warm idle. In the future I only intended to do headers so I could increase power and a rear silencer to reduce weight but was concerned I would get too loud on open throttled for my taste.
If you want to end up with headers, don't bother with options 1 or two, decat pipes would become redundant anyway, and a back box that is the right volume now would probably be too loud if you switch up to header/sport cat combo later.
__________________
Stuart Dickinson
Managing Director
Velocity Automotive Performance Limited
206 Maple Avenue
Oliver, BC
Canada V2A 4W6
Office: (1)250-485-5126
www.velocityap.com
Stuart Dickinson
Managing Director
Velocity Automotive Performance Limited
206 Maple Avenue
Oliver, BC
Canada V2A 4W6
Office: (1)250-485-5126
www.velocityap.com
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