Engine/Transmission (1998.5 - 2002) BOMBing the PacBrake?

[AHuska]

I'm really enjoying using my PacBrake now that I got it unstuck. I haven't towed with it yet, but my favorite trick so far is to cruise around town in 3rd gear without having to hit the service brakes unless there is a red light.



When I had the Pac apart I saw the hole in the butterfly that prevents backpressure from getting too high, and I am wondering if there would be a way to put a 60psi valve in that hole to maximize low RPM pressure and braking. I don't have the old TDR mags in front of me, but I seem to recall an ad in one of the recent ones that compared a Pac to a different brand, and the other brand claimed that it was better at low RPM since it didn't have a hole. Well, how do they manage the high RPM pressure? I'll try to find the ad and report back to this thread, but no promises on actually finding it.

 

[Bob V]

Anything you put in the brake will not last; the exhaust is just too nasty of an environment. The brakes that regulate backpressure are all done externally

 

[AHuska]

Do you know off hand which brands do regulation? Has anyone done a comparison between exhaust brake designs?

 

[NoSeeUm]

The PRXB I have has that very thing integrated into the main butterfly valve. It is basically a spring loaded poppet type valve in that very same hole you are talking about.



Take a look at one, and I bet you could make your own.



Jim

 

[Pacbrake]

Why not just buy the up-grade version of the PRXB, it's going to save you time money and a lot greif?

 

[AHuska]

I'd say the upgrade option would be the least grief-filled solution. I was just wondering if such a thing had been done before... guess not. The numbers on the PacBrake website are substantial... PRXB To The Test - PacBrake - Exhaust and Engine Brakes for Automotive, Motorhome, Medium Duty and Heavy Duty Vehicles but at $1200 I'll wait for my next truck before taking the plunge since this one works great.

 

[RAndrae]

prxb

I dont think the PRXB is available for pre 03...

 

[Pacbrake]

we now have the PRXB available for 1994 and up.



If your truck has the on-baord air system you can just add the tank and replace the brake unit rather then buying the complete kit. For vac opp exhaust brake kits the complete exhaust brake kit will have to be installed.