Back Pressure on Exhaust Brake

[HGreen]

I have a Pacbrake PXRB exhaust brake on my CTD and was looking at gauges to use on my truck, definitely exhaust temp, boost and since I have a manual and don't need transmission temperature, I have been thinking about back pressure off the exhaust brake. Does anyone know what the maximum I should see? I have emailed Pacbrake the first of the week but haven't gotten any response.



Thanks for the help.

 

[tkerrigan]

If you exceed 60 lbs you risk interference between exhuast valves and pistons. About 55 lbs is what I'm aiming for, haven't been able to get it to that yet. I might go to the B&D bash in Canada and see if they can get it there.

 

[jelag]

The PXRB's are checked at the factory and set to 60 psi... . We use a test gauge to test them if we think there might be a problem... . its VERY hard to duplicate the same readings as they get at the factory... . that said... there's a lot of other information I'd rather have than the back pressure...



BTW - PacBrake and Jacobs both suggest that you check your connection between the turbo and exhaust brake at least once in the first 500 miles..... check to make sure that the clamp is installed right and it is tight... . once you've done this once... I don't suggest that you worry about it for the next 50K miles or so... .



And we will install an EGT probe in the test port..... just understand that your reading EGT after the turbo..... saves drilling and taping a hole... .



Hope this helps... .

 

[tkerrigan]

My EB is an inline, and since there is no carbon produced when using, it is very difficult to tell where a leak might be. Could be either one of two clamps, bad weld, butterfly not fitted properly. I have an oil filled gauge connected to the bottom port on the valve housing and have not been able to get more than 40lbs backpressure. 50-55lbs would be just right as it is difficult to keep it slowed down with the 5W going downhill.

 

[24VChev]

tkerrigan, on your back pressure issue, do you know how much air pressure you are sending to the brake cylinder? You should set the air pressure regulator to about 95 psi. I would check the air pressure at the outlet of the air solenoid valve.



Best of luck,



Malcolm

 

[GWBourne]

And we will install an EGT probe in the test port..... just understand that your reading EGT after the turbo..... saves drilling and taping a hole... .

hey... my slacking self FINALY drilled my hole in my exhaust manifold yesterday... gauge has been in the truck almost 2 years now... life isnt so simple some times, anyway, the warm up feature on my jake was handy, and im very glad i had my hat and my glasses on... talk about being sand blasted with a heat gun... Oo.



as for backpressure on the brake... wouldnt that ALSO double as a drive pressure gauge?



Grant

 

[24VChev]

only if you put the pressure port before the Turbo's. If you use the brake pressure port then all you get is the brake pressure.



Malcolm