Installation of Jake Brake on 88 8V92 DD

[Curt Sprenger]

Ken,
There is no upgrade to a Jake Brake from the Transmission Retarder that
I know of. The two units are independent. You use one or the other. I'm in
no way an expert here, but I believe you turn OFF the Retarder (switch)
and then use the Jake Brake. That is what I have done on our Mechanical
Detroit 8V92, and I've been in touch with an Allison dealer to confirm
this. My research tells me that you install the Jake for the DDEC, then
take the coach to a dealer for  re-program utilizing the Jake Brake and
making the ECU work properly. Hope this helps.


Curt Sprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, CA
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On Thu, Jul 23, 2009 at 3:43 PM, KP Marsh <"towanda692006@yahoo.com"> wrote:

 

--- To the forum:   We have an 89 WB 40 coach that was built with an 88 DD 8V92 engine. This model has the first model of DDEC I which featured a 2 part ECM and required a DDR Reader by Ragen called a "T" bone tester. This coach is also equipped with a transmission retarder that we would like to up-grade to a Jake Brake. Does anyone of the forum know whether this modification can be done on this model of DDEC or could it be wired as a strictly electro-mechanical set-up with a switch on the dash?  I would appreciate any information. We have not purchased the Jake set-up yet, just doing my research.   By the way if there is any owner of these old DDEC units that need to borrow our tester feel free to contact me.   Ken and Patti Marsh 89 WB Towanda and our 6 cats Full-timing currently at Carson National Fish Hatchery, Carson, WAÂÂ