Exhaust brake for 4.2

[Cuppa]

I've had a look & there are a couple of threads here with questions about fitting an exhaust brake to a 3.0 litre Patrol, but no one in those threads had actually fitted one.

Today I had some brief correspondence with a chap from another (non Patrol) forum who has a turbo'd 4.2 with an exhaust brake fitted to his Patrol which he says, (in conjunction with a 4.6:1 diff), gives greater safety descending hill when towing a caravan, as well as giving more control in low range descents when 4wd'ing.

Given the relative lack of engine braking in the turbo'd 4.2 when compared to the n/a 1hz I had in the Troopy, the idea of fitting an exhaust brake when I eventually get around to fitting a new exhaust (3") seems like an attractive idea.

The chap's exhaust brake was from SGV Exhaust Brakes (http://sgvaustralia.com) in NSW & he reckoned it cost about $1300 to buy (not sure how long ago) plus fitting costs. In my book I would rather spend that sort of money to give me greater 'sure footedness' when rolling 4 tonnes down loose hills, than I would spending it on releasing more horses.

So ...... Has anyone else yet fitted an exhaust brake to a Patrol, and in particular a 4.2 (although other motors would be of interest too) & wants to share details?

I have an exhaust brake on our ED33 (3.3 litre 4cyl diesel) engined bus, & love it when in the hills.

[MudRunnerTD]

No but it would be sweet!! I have fitted Braided Brake lines to the GQ which made a difference but upgrading the the GU brakes made the most difference for sure!!

[NP99]

Take a listen here mate, might not be a good idea :)

http://youtu.be/52byisiatRg

[Cuppa]

There is also a mob in Geelong who sell aftermarket exhaust brakes for Toyotas & I believe they have been used on Patrols too. These are a butterfly type, whereas the SGV are a guillotine type. (Which they claim to be be a more effective design). SGV make their own & I was told they were helpful & good folk to deal with. Not sure if the Geelong folk are just selling a product they import, or if they make their own gear.

http://gearingdynamics.com.au/Exhaust-Brake-for-small-diesel-vehicles

[Family4x4]

An exhaust brake was one of my first thoughts when I knew i was getting a TD42.

[Cuppa]

Take a listen here mate, might not be a good idea :)

http://youtu.be/52byisiatRg

Love it cock. Had heard it before, but good to hear it again. Last time I heard it was shortly before I took the bus out. First 'Avoid using engine brakes' sign ......... I just had too! :D.
Different types of engine brake too though, I think there are noisier types than exhaust brakes ....... cock.

[MC97GQ]

Hey Cuppa,

What about a truck wreckers, maybe you could source one from a Canter or some other small truck, It might be a heck of a lot cheaper than going brand new.

Mark

[threedogs]

Price wise the cost is about $2500 plus forgot the mob who used to do it ,
but not worth it from all the research I did on it .plus talking to shop owner

I was only going to use it off road, get every line redone in Braid even the short ones and it will make a difference

[NP99]

Love it cock. Had heard it before, but good to hear it again. Last time I heard it was shortly before I took the bus out. First 'Avoid using engine brakes' sign ......... I just had too! :D.
Different types of engine brake too though, I think there are noisier types than exhaust brakes ....... cock.

It's one of those things you never get tired of listening to :)

[Col.T]

G'day Cuppa,
had a long talk years ago with Tony who fits the SGV units in Chipping Norton in Sinney when I found how totally R/S compression braking with a turbo is.
The old standard 4.2 was excellent with the van on, the new 3.0crd with turbo is crap.
Didn't go with it but I'd suggest a talk with him. Top bloke.
Dunno the number but enter SGV exhaust brakes on the web and you're there,
regards
Col

[Rumcajs]

The exhaust brakes can be great but consider that to be effective you need to find the way to cut fuel at the same time it is on as the exhaust temp increase from actuating it is bad idea on the running engine not to mention lessens the effectiveness. So a linkage of a sort or electric stop actuator for fuel cut on injection pump while the brake is actuated is the go. This would also require fail safe to cut out when engine RPM drop bellow let say 850 RPM.

Just to clear the misunderstanding, exhaust brakes are generally much quieter than compression brakes (sometimes known as Jake bleeder brakes).
Most commonly North American trucks would use engine compression brakes and European trucks engine exhaust brakes but combination of both is actually more effective and reduces the noise significantly especially with exhaust brake muffling the compression release noise greatly.

TBH for the money quoted (~2 grand) I know better way to spend on Patrol.

Cheers

[Ben-e-boy]

For on road and maintained dirt roads (4 high stuff) an exhaust break could be quite effective.
But for control offroad in low range nothing will come close to reduction gears as you will have the same control on the throttle or off. The 43% gears will be suited as the gearing is now about 3:1, landruisers has a low range of 2.8:1 which I do like much more than standard nissan.

[Sherro]

Engine brakes are operate differently to exhaust brakes, engine brakes can be anywhere up to 130 db and exhaust brakes are very quiet some times barely noticeable so don't be afraid to use it if it's going to help. Heres a bit of lite reading on the two.
http://en.wikipedia.org/wiki/Exhaust_brake
http://en.wikipedia.org/wiki/Compression_release_engine_brake

[pearcey]

G`day Cuppa.
Do a lot more research mate. make sure that the turbo can handle the reverse positive pressure.
Most SUV and 4x4 turbo`s are not designed to be used with an exhaust brake` and fitting an exhaust brake will damage the turbo.
Check which turbo to use with a turbo specialist and make sure it can handle the reverse pressure

[MudRunnerTD]

There is also a mob in Geelong who sell aftermarket exhaust brakes for Toyotas & I believe they have been used on Patrols too. These are a butterfly type, whereas the SGV are a guillotine type. (Which they claim to be be a more effective design). SGV make their own & I was told they were helpful & good folk to deal with. Not sure if the Geelong folk are just selling a product they import, or if they make their own gear.

http://gearingdynamics.com.au/Exhaust-Brake-for-small-diesel-vehicles

Have you asked them for a price Cuppa?


Interesting thread guys, thanks for all the input.

[Rumcajs]

G`day Cuppa.
Do a lot more research mate. make sure that the turbo can handle the reverse positive pressure.
Most SUV and 4x4 turbo`s are not designed to be used with an exhaust brake` and fitting an exhaust brake will damage the turbo.
Check which turbo to use with a turbo specialist and make sure it can handle the reverse pressure

Any fixed geometry turbocharger will handle exhaust brake as long as the fuel is not injected/cut during its operation.

The VGT units are the ones which don't handle exhaust brakes however they can be used as faux exhaust brakes themselves when the vanes are set to max opening on deceleration and fuel is cut. It is actually nifty feature used on big boys toys.

Cheers

[nissannewby]

No need to really cut fuel on a 4.2. There isn't really any heat being generated on decel and if setup correctly the exhaust brake will only come on with the throttle is completely lifted. The exhaust brake doesnt close it completely it only restricts it most don't close all the way or actually have holes in them allowing gas to still escape.

The biggest challenge is fitting it to our 4.2. Most are air actuated with positive pressure there are some vacuum ones available but they are hard to come by in sizes as small as 3". You could quite easily use some micro switches, relays and a nice heavy actuation solenoid.

I have a friend who has one on a 4.2 with a 4" exhaust he initially used his unichip to switch but I think he may now just use a Mac valve setup.

Ever wondered why there is a nice big puff of black smoke from a truck with an exhaust brake once it's disengaged......

[Cuppa]

Ever wondered why there is a nice big puff of black smoke from a truck with an exhaust brake once it's disengaged......

Yes. I get that on our bus. I’m guessing it is caused by a small amount of unburn’t diesel injected in as the exhaust brake shuts being released as the the exhaust brake is ‘opened’?

[threedogs]

I'd be going reduction gears in a heart beat if given the choice between the two.
Not 100% sure they are legal on 4x4s,{exhaust brake].Braided lines will help as well,
Do you go that far off road to really require one as your ute is set up to tour and camp
not heavy off road work. At 4 plus tonne its gunna take a lot of stopping regardless.
And yes Toyota have a great low 1st sometimes you need to accelerate its that slow lol
then change up a gear

[Robo]

What about the standard exhaust manifold studs and gasket are they up to the task of the back pressure?