bigdaddycool
Member
- Joined
- Sep 5, 2008
- Messages
- 515
- Reaction score
- 11
- Points
- 18
- Location
- Brisbane, Queensland
- Members Ride
- 2009 VE SS SILVER SEDAN
I'll be breif:
I have a 2006 VZ Exec, Pacemaker Headers, 150Cell Hi-Flows. I've changed my exhaust a million times but here's my issue and I'm after opinions.
1. From my hi-flows it runs 2" stock lines. I recently had a 2.5" twin xforce system put on but it was way loud due to my ultra flow cats....... so I took it to my exhaust shop and asked em what I could do to quiten it without touching the xforce setup. They then put in 2 glass packed resonators straight after the cats. Since then I've had a MAJOR tranny issue. It thumps, hesitates etc.........
It got slightly better but ..... I ended up pulling the xforce off, putting my old system back on as I could directly bolt it back on. My current setup runs 2" into a central muffler after the center joint, which then goes out a 2.75" to a rear resonator with a 2.5" out.
The thump remains and shifting is bad. I've got VCM Suite and I've been trying to tune the torque out a bit and up the shift pressure to elevate this problem. I've improved it but it's still sh*thouse.
How here's the thing. My thoughts are the two front resonators are creating too much back pressure causing the tranny to go haywire for some reason however........ I have got more torque now and dont loose any uptop.......... nor is my engine getting hotter. Which to me says it's ok.
Obviously the answer lies in getting the two resonators that were added "removed" and then it'll be fine again.
My question is.......... is my exhaust in general too restrictive as it has 3 resonators in total (2 front, 1 rear) and a central straight thru muffler.
The car sounds good, quiet but has a nice level note all the way thru the rev range. I was hoping to keep my new resonators, without them my rear resonator sounds like a tinny b*tch.
Would removing the rear resonator and just having a straight thru pipe help or? ........ I was thinking of unbolting the rear resonator temporarily and going for a drive to see if removing that small restriction helps. But of course it comes back to if it makes the exhaust loud again.
99% of all exhausts out there for the alloytechs like mine dont work on mine due to my cats being a lil more flowy then most peoples hi-flows.
1. Are the two front cats the cause of my problem?
2. Will removing the rear resonator help as the front help with keeping low down torque.
3. Are maybe the o2 sensors telling something weird to the ecu bout the setup causing the tranny thump? as the resonators pretty much sit directly behind the cat at the joint where the rear o2's are also sitting on the rear of the hi-flows.
A. Tuning the thump out? idea's..... the currently setup, can I lower torque longer to help it shift (stock 0.5) tried 0.4........ shifts a bit quicker. Adding shift pressure actually makes it worse.
HELP. IDEA'S.
I have a 2006 VZ Exec, Pacemaker Headers, 150Cell Hi-Flows. I've changed my exhaust a million times but here's my issue and I'm after opinions.
1. From my hi-flows it runs 2" stock lines. I recently had a 2.5" twin xforce system put on but it was way loud due to my ultra flow cats....... so I took it to my exhaust shop and asked em what I could do to quiten it without touching the xforce setup. They then put in 2 glass packed resonators straight after the cats. Since then I've had a MAJOR tranny issue. It thumps, hesitates etc.........
It got slightly better but ..... I ended up pulling the xforce off, putting my old system back on as I could directly bolt it back on. My current setup runs 2" into a central muffler after the center joint, which then goes out a 2.75" to a rear resonator with a 2.5" out.
The thump remains and shifting is bad. I've got VCM Suite and I've been trying to tune the torque out a bit and up the shift pressure to elevate this problem. I've improved it but it's still sh*thouse.
How here's the thing. My thoughts are the two front resonators are creating too much back pressure causing the tranny to go haywire for some reason however........ I have got more torque now and dont loose any uptop.......... nor is my engine getting hotter. Which to me says it's ok.
Obviously the answer lies in getting the two resonators that were added "removed" and then it'll be fine again.
My question is.......... is my exhaust in general too restrictive as it has 3 resonators in total (2 front, 1 rear) and a central straight thru muffler.
The car sounds good, quiet but has a nice level note all the way thru the rev range. I was hoping to keep my new resonators, without them my rear resonator sounds like a tinny b*tch.
Would removing the rear resonator and just having a straight thru pipe help or? ........ I was thinking of unbolting the rear resonator temporarily and going for a drive to see if removing that small restriction helps. But of course it comes back to if it makes the exhaust loud again.
99% of all exhausts out there for the alloytechs like mine dont work on mine due to my cats being a lil more flowy then most peoples hi-flows.
1. Are the two front cats the cause of my problem?
2. Will removing the rear resonator help as the front help with keeping low down torque.
3. Are maybe the o2 sensors telling something weird to the ecu bout the setup causing the tranny thump? as the resonators pretty much sit directly behind the cat at the joint where the rear o2's are also sitting on the rear of the hi-flows.
A. Tuning the thump out? idea's..... the currently setup, can I lower torque longer to help it shift (stock 0.5) tried 0.4........ shifts a bit quicker. Adding shift pressure actually makes it worse.
HELP. IDEA'S.