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The 3116, 3126 and C7 all use the same 4” full Marmon turbo outlet. Yep, its a balance between flow, orifice size and spring. The one I fell into is actually a model intended for a C7 so will probably have to do a little tuning As the 3126/C7 has ~10% more displacement/flow At a giver]n RPM...

I just procured a PRXB4, so looks like I will be working this out on my WTEC2:)

Here is the Pacbrake diagram for the WTEC3, basically the same as the WTEC2… https://support.pacbrake.com/wp-content/uploads/L5206.pdf

Basically accessing the vehicle interconnect wiring similar to what is seen in this WTEC2 diagram. Pacbrake would have the exact wiring config. I saw it not long ago, let me see if i can find a link. This diagram shows using a VIM relay, and you don't have a VIM, so you will need to add a relay…

This right here. Mine is a 98 with the WTEC 2…

And his was the A0 with a WTEC 3 that was already configured for the ex brake…

It does not, but it can. The issue is on the earlier A0 with the WTEC 2 transmission, the transmission auxiliary function used for ex brake is already assigned/wired and most likely the TCU is programmed for PTO function. I have not confirmed that PTO programming on mine, but I have confirmed...

Does your ex brake disengage when you step on tbe brake pedal?

Correct, the solenoid valve power when in warmup comes from the neutral relay and only passes thru the switch. Contacts. If the ex brake light is coming on there is power on K16 pin4(87A on the drawing K16), as that is its source. The light power taps off before the warmup/ex brake switch...

Should be the de-energized relay contact, looks to be pin4 on that relay. It will be 24V. I have not seen an ex brake config setup to operate the brake lights before...

The ex brake light on the A1 receives the same power the ex brake solenoid valve does, so light on means brake engaged. Like I wrote above, That power originates at the ECU. and passes thru K16 contacts and also powers its coil. But it passes thru the de-energized contacts. So relay off = ex...

Wonder if your butterfly is sticking? Do you get a check engine light? What does “limp mode” mean? Regardless of wether the switch is in the ex brake position, as soon as you switch it off or touch the accelerator, the ex brake butterfly should immediately swing open… got a webcam or wireless...

Well that sounds weird. Do you get immediate throttle response when you step on the accelerator while the switch is still turned on? On the A1/A1R, the ECU is the source power for the exhaust brake. I would say the ECU only provides that power when the TPS/pedal is in the idle position. The...

True for every Allison... If that input is programmed for PTO(or something else/not programmed like mine is), it cannot of course provide the preselected downshift… The lockup function, 100% LU/engine hard coupled to the transmission in 3rd and above, is a normal part of the Allison shift...

On the Allison, it enters lockup in our 3rd gear when turbine RPM approaches input RPM. It stays locked up 100% of the time all the way up thru 7th and back down thru 3rd. It drops out of lockup in 3rd most likley when it senses the downshift to 2nd is iminent. The main thing the pacbrake...

Wooah… Stereo…

You probably should clarify that a little. Jake brakes are illegal/restricted in many places because they are obnoxiously noisy when they start popping their pressure relief(BAA, BAA, BAA,BAA, BAA)… the signs I am used to seeing are worded something like this: “Unmuffled Jake brakes...

Yep, when you switch the switch to warmup, it sends power provided by the neutral relay directly to the ex brake solenoid and the dash light…

I have driven several vehicles with ex brake and none have operated the brake lights. No ex brake vehicle I have ever driven has ever lifted the EX brake when you press the brake pedal, only when you press the accelerator... you should be able to use the two brake modes together... I...