Installation of Jake Brake on 88 8V92 DD

[Gregory OConnor]

If you want a jake on a ddec I would find out what would be the advantage of
running it with the ddec. I bet for the most part the ddec will put restrictions
on applying the jake making it idiot proof. like disabling the jake at low speed
and disabling the jake when the tps is showing the operator has a foot on the
throttle. problem with both is ;I can see where these prompts can stop you from
stopping and ;no idiot should be driving a bus.
Many onroad truckers remove the if-than-dont-apply statements from the code,
one way or another. they measure stopping force with HP. Curt do you know the
stopping force of the jake and Allison retarder? The retarder on CurtS bus is
way more powerful than that on my 94pt bus. I'm not a fan of relying on a Jake
or the Brakes for that matter but I am a fan of Jake assistance and stopping. I
am considering adding a Jake.
Greg of'Tim&Greg
94pt
free man, Horse died and sold the boat on friday.



--- In WanderlodgeForum@yahoogroups.com, towanda692006@... wrote:
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> Thanks Curt,
>  
> This confirms what I was told as well, We haven;t bought the set yet, so I
think I will pass. I haven't found very many technicians who have any knowledge
with the old DDEC I system. We were offered a Jake set, minus wiring for $600,
which seemed worth reserching.
>  
> Thanks for your response.  
>  
> Ken and Patti Marsh
> 89 WB40 Towanda
>
> --- On Thu, 7/23/09, Curt Sprenger wrote:
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> From: Curt Sprenger
> Subject: Re: [WanderlodgeForum] Installation of Jake Brake on 88 8V92 DD
> To: WanderlodgeForum@yahoogroups.com
> Date: Thursday, July 23, 2009, 11:41 PM
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> 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
> Read all about Southwest Bluebirds and Friends (SWBB) at http://www.SOUTHWES
T-BLUEBIRDS. ORG ...Then Join us.
> "Host of the Annual Bluebird Quartzsite Rally"
>
>
>
> On Thu, Jul 23, 2009 at 3:43 PM, KP Marsh wrote:
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> To the forum:
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> 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, WA 
>