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I have an opportunity to pick up the rear section of the exhaust system on a wrecked V8 that I found locally for a decent price. By no means am I pretending to be a "V8" but I always just preferred the balanced look of the quad exhaust tips on the V8 over the V6 straight center exhaust.
Looking at the parts diagrams and layouts of the rear exhaust portion of the V6 and V8, it appears that its a straight bolt on affair. The rear is secured by using exhaust clamps and the exhaust hangers seem to be all in the same spots. The only thing I would need to complete this is the rear lower valance on the bumper. I don't expect the sound to change much as the muffler itself is very similar in design to the V6.
I believe these will swap without a problem. I've been curious about this myself.
If you do so, I would interested in your stock setup for measurements if you decide to sell or would like to rent to aid in development.
It looks like there is a center path for the exhaust tips on the V6 that would be left exposed. Would you be replacing more than just the exhaust itself?
It looks like there is a center path for the exhaust tips on the V6 that would be left exposed. Would you be replacing more than just the exhaust itself?
Correct. I would have to source the lower valance from a V8 car.
I believe these will swap without a problem. I've been curious about this myself.
If you do so, I would interested in your stock setup for measurements if you decide to sell or would like to rent to aid in development.
Regards,
Derek Fricke
Throw me a price. But I'm in California so shipping would be a bit pricey.
Last edited by WhiteTardis; Sep 18, 2015 at 05:11 PM.
I like the center exhaust, a little different. but go for it, interested in seeing how it goes. If you are really bold...keep the center exhaust and also go dual sides :-)
It appears the only significant modification needed for this swap would be rerouting the vacuum tubing for the valves, but that should be fairly simple.
Diagrams and parts breakdowns are pretty accessible online.
Originally Posted by lhoboy
It appears the only significant modification needed for this swap would be rerouting the vacuum tubing for the valves, but that should be fairly simple.
It's even easier since I don't have the active exhaust. I just need to shimmy the valves to stay open before installing.
If you look at the V8 and V6 from "low down and behind" you will see a metal support beam that goes between the two rear wheels and under the exaust tubes before they enter the rear exaust system.
On the V6 that beam is symetric and "horizontal flat".
On the V8 that beam is not horizontal. It is not "horizontal flat" and is lower on the left side than the right. It looks like this is done to give room for the exaust on the left side.
That support beam is not shown in the pics above, but I would guess it goes aproximately where it is marked by a "x2" in a black arrow.
I do not know if that could cause any problems, but I would check that out first.
It's even easier since I don't have the active exhaust. I just need to shimmy the valves to stay open before installing.
I don.t think you even need to do that. The valves are normally open. That's why the exhaust is full open on startup for the active exhaust systems before the vacuum builds up.
I don.t think you even need to do that. The valves are normally open. That's why the exhaust is full open on startup for the active exhaust systems before the vacuum builds up.
I've thought about that but it really depends what position the valves were in when the donor car was totalled.
I like the center exhaust, a little different. but go for it, interested in seeing how it goes. If you are really bold...keep the center exhaust and also go dual sides :-)
I've thought about that but it really depends what position the valves were in when the donor car was totalled.
I think the valves are spring loaded in the normally open position. That's why the valves are open on startup before the vacuum builds up to shut them down. (At least, that's what happens in my deluded universe).
Each exhaust valve consists of a normally open plate valve and pneumatic actuator.
The vacuum pump, solenoid valve, and reservoir are attached to a bracket installed in the left rear wheel housing, behind the wheel arch liner. Plastic pipes are connected between the vacuum pump, reservoir and solenoid valve, and between the solenoid valve and the two exhaust valves.
In the pipes between the solenoid valve and the exhaust valves, a restrictor is installed in parallel with a check valve. The restrictor slows the flow of air through the pipes, to damp the opening of the exhaust valves. The check valve ensures that air flows only through the restrictor when the exhaust valves are opened, but allows the restrictor to be bypassed when the exhaust valves are closed, to give an undamped closing movement.
The solenoid valve controls the operation of the exhaust valves by connecting them to the reservoir and vacuum pump or to atmosphere. Atmospheric pressure enters the solenoid valve through a filter attached to a vent.
Operation of the Active Exhaust System is controlled by the ECM.
Principles of Operation
The position of the exhaust valves are set by the Engine Control Module (ECM) depending on engine speed, accelerator pedal position, and the mode selected by the active sports exhaust switch or JaguarDrive switchpack.
On vehicle startup the exhaust valves are always open, to enhance the exhaust sound.
When there is no active sports exhaust switch fitted or when the active sports exhaust switch is set to ‘Off’, the exhaust valve position is closed when driving in mid speed and load conditions, then open for high speed and load conditions. This serves to both enhance the sound quality in the vehicle and reduce back pressure to enhance engine performance.
When the active sports exhaust switch is set to ‘On’ the exhaust valves open over the majority of the engine speed and load range to further enhance the sports driving experience, only closing where specific engine operating conditions dictate.
If Dynamic Mode is selected on the JaguarDrive switchpack, the active sports exhaust system will automatically choose the ‘On’ mode. If Dynamic Mode is de-selected, the system resumes the prior state.
When the active exhaust switch is turned ‘On’, a hardwired signal is sent to the JaguarDrive switchpack, also located on the center floor console, which in turn transmits that signal on the High Speed CAN BUS network to the ECM.
The ECM will also energize the active exhaust relay in the Central Junction Box 5 seconds after the ignition is switched on. When the relay is energized, it supplies power to the vacuum pump and the solenoid valve. The vacuum pump is connected to ground and runs continuously while the relay is energized, maintaining a depression in the reservoir and pipes to the solenoid valve.
The solenoid valve is connected to ground through the engine control module. When the ECM determines the exhaust valves require closing it connects the solenoid valve to ground.
When the solenoid valve energizes it opens the pipe connection from the reservoir and vacuum pump to the exhaust valves; and closes the atmospheric vent. The depression at the reservoir and vacuum pump is then sensed at the exhaust valves, via the check valve, and the exhaust valves close.
When the ECM determines that the exhaust valves require opening, it disconnects the solenoid valve from ground. The solenoid valve de-energizes and closes the pipe connection to the exhaust valves, and opens the atmospheric vent. Atmospheric pressure is then sensed at the exhaust valves, via the restrictor, and the exhaust valves open.
The matrix below provides an overview of system operation, although the system will actively respond to engine load and throttle angle.
Exhaust Swap from V8 to a V6
