Exhaust Brake???

[polo_spec_d]

I had a idea jump into my head today.

Could a exhaust brake be fitted to a my little pogo? I have seen them on trucks just been butterfly valves with a actuator and turned on and off via the brake pedal.

Could this work??

Thanks,

Matty

[Preen59]

The exhaust brake is an additional pedal, generally.

I've been wondering the same thing with the Caddy.. I'm unsure whether it would upset the ECU..

It would be great to be able to use an exhaust brake alternatively to the brake for deceleration into reduced speed limits and down hills..

It would be great if someone could chime in with some info..

[polo_spec_d]

I know on some Izusu LRs the exhaust brake is switched on or off via the indicator stalk. Could also be used for performance situations like on the track and etc.

[Greg Roles]

Also thought about this early on, if not only for the mini truck sound! The golf HAS a flap in the inlet, to do with the EGR, and I'd have to say it does "feel" like it is shutting off and acting as a sort of throttle on deceleration down a hill, whereas a typical older diesel will just keep rolling. It certainly shuts for turning the motor off, as with it disconnected the engine shut down is far rougher and longer. Tried that

There's absolutely no reason why you couldn't fit one, but a "real" one is expensive but I've absolutley no idea what the potential for damage could be.
Certainly not something I'm prepared to try with a DPF!

[Preen59]

Also thought about this early on, if not only for the mini truck sound! The golf HAS a flap in the inlet, to do with the EGR, and I'd have to say it does "feel" like it is shutting off and acting as a sort of throttle on deceleration down a hill, whereas a typical older diesel will just keep rolling. It certainly shuts for turning the motor off, as with it disconnected the engine shut down is far rougher and longer. Tried that

There's absolutely no reason why you couldn't fit one, but a "real" one is expensive but I've absolutley no idea what the potential for damage could be.
Certainly not something I'm prepared to try with a DPF!

Haha go the mini truck sound!

I was just thinking.. These engines have "variable engine brake" that is computer controlled. So if they have an inlet 'flap', that probably does the same thing.. Hmmmm......

[gregozedobe]

My (very) fuzzy synapses seem to have a vague recollection from many years ago of what was required to fit an exhaust (aka "Jake" brake) to some US diesel pick up trucks, and for some engines it was pretty straight forward install of a shut-off valve somewhere, but for others it required new (stronger) springs on the valves in the head. Can't remember whether it was only inlet, only exhaust or both. Sorry I can't remember more, but it was a long time ago and I wasn't that interested at the time.

I'm sure a bit of web searching would tell you lots.

So you guys aren't content with your diesel soot pollution, now you feel the need to add noise pollution too ? Can't you just put a huge sign on your roof that says "DIESEL" and be done with it ? (JK)

[comfortline]

We just love being anti-social. If we can't smoke you out, we'll just be a noisy nuisance anyway.

Its not like we're hoons with a 180sx

[smithy010]

Probably the diesel pickups that grego was talking about had cummins motors in them, and the cummins has the original jake brake, so they were probably designed for that sort of thing.

I would think that surely high back pressure would cause your exhaust valves to open inadvertently, and clip the tops of your pistons.. Although maybe i'm wrong

Apart from that, your manifold (or the bit upstream from you exhaust brake) would probably need to be rated at a far higher pressure than turbo boost pressure, to gain any significant advantage..

[smithy010]

I believe that also there may be issues with Exhaust gas temps..

Having said all this,

Assuming that i am proven wrong, and it could be possible, just think about the type of high restriction turbine, or similar you could drive, in order to create some form of "Regenerative" braking... Hmmmm...

[VW Convert]

Jacob's brakes (Jakes) (or the Mack trucks equivalent Dynatard) are totally different to the exhaust brakes the OP was referring to. The operating principle of those units was to hold the valves closed until just before TDC on the compression stroke thus magnifying engine braking. This involved the fitment of Jake brake housings between the cylinder head and the rocker cover along with a range of other hardware such as microswitches etc.

The butterfly valve that was/is used commonly in European and Japanese trucks and generally actuated by microswitches on the accelerator and clutch pedal is a completely different arrangement. In theory it would be simple to fit such a unit to a VW but in reality it would be more trouble than it is worth and for what gain?

If you want drive a truck, buy a truck!

Cheers

George

[Blitzen]

As what George said, there is no point trying a Jacobs Brake or Dynatard, as this works on electrical solenoids and oil pressure to activate the valves...
In regards to an exhaust brake it all depends how it is activated, whether it be manually with an air operated valve, or on the clutch or accelerator. Also depends whether the system is running an inline Fuel Pump, or a Common Rail system. Either way, you are going to have to have a way to take the fuel pump or fuel controller back to the Idle Position so as the engine isn't producing power while the Exhaust Butterfly is in the closed position. The Dynatard, Jacobs Brake and Exhaust Brakes are all Auxiliary Braking System, and unless you are towing greater than 7 ton's, there really is no point having it as the stock brakes are sufficient enough. Also looking at the added weight that may come into it, the engineering costs, mods, and getting the system just to fit in a small car don't really make it a viable option.

[Greg Roles]

Boo Hiss to the kill joys. If these young tossers can go dragging metal down the road to get sparks, well I want my mini truck sound for the traffic lights.

[VW Convert]

Boo Hiss to the kill joys. If these young tossers can go dragging metal down the road to get sparks, well I want my mini truck sound for the traffic lights.

Just get a scarifier attachment to tow behind you, you'll make the mini truck tossers look like amateurs! Anyway, I've never seen a tractor with an exhaust brake!



Cheers

George