Installation of Jake Brake on 88 8V92 DD
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07-25-2009, 08:21
Post: #6
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Installation of Jake Brake on 88 8V92 DD
Pete,
There must be a limitation in the earlier DDECs. I have DDEC 4 and am able to turn off the jake while it is active and have it resume operation by throwing the on switch (no ignition key reset required). To eliminate the aggressive downshifts I had the DDEC programmed to preselect fifth instead of fourth. I can then downshift manually to get the desired braking effect while not over-reving the engine. David Brady '02 LXi, NC Sent from my Verizon Wireless BlackBerry From: Pete Masterson Date: Sat, 25 Jul 2009 11:21:32 -0700 To: Subject: Re: [WanderlodgeForum] Re: Installation of Jake Brake on 88 8V92 DD The exhaust-type jake brake on my coach is fully integrated into the DDEC. It operates when switched on and you remove your foot from the throttle. It also activates a program with the transmission to downshift (as speeds allow) to increase the jake braking power. (I have found this aspect to be annoying, at times. I've heard of some who have had the computer reprogramed to give an alternate down shifting program with "mode on".) In general, the jake brake, as it is set up, is quite satisfactory. It's not a crutch so much as a convenience. I always have the option to step on the service brake to slow the vehicle. The jake is at its best when holding a steady speed on a long downgrade. Since it is integrated into the system, I usually leave the enable switch in the "on" position so that the jake engages during normal slowing for a stop signal, etc. Its slowing assistance simply allows reduced pressure on the service brakes, probably extending brake lining life. Due to the design of the S-60 engine (95 and later 42/43') the jake provides more slowing force than is possible with the 8v92 (as I understand). I did discover one bug in the system while traveling across Texas (and I thank whomever it was that explained it to me). I was puzzled that when entering a town with a "no jake brake rule" that sometimes the system would not return to normal operation after leaving the town. But then the next day, the jake system worked as expected. It's been discovered that turning off the jake brake system, _while_ the jake is activated, causes the system to be unable to reactivate until the engine (and DDEC) is shut down and restarted. Switching the jake system off while the jake is _not_ active works as you'd expect. (So, I've learned to never turn off the jake system unless it is inactive.) So what happened when the jake didn't respond as expected (after blundering into the 'bug')? I just pressed harder on the service brake and stopped as needed. Other than the surprise of not having the system operating when it was expected, it was no big deal. Inconvenient, perhaps, but still, not a serious issue.
Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 El Sobrante CA "aeonix1@mac.com" my coach is for sale: http://www.aeonix. On Jul 25, 2009, at 10:39 AM, Gregory OConnor wrote:
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Messages In This Thread |
Installation of Jake Brake on 88 8V92 DD - KP Marsh - 07-23-2009, 10:43
Installation of Jake Brake on 88 8V92 DD - Curt Sprenger - 07-23-2009, 16:41
Installation of Jake Brake on 88 8V92 DD - towanda692006@... - 07-24-2009, 01:19
Installation of Jake Brake on 88 8V92 DD - Gregory OConnor - 07-25-2009, 05:39
Installation of Jake Brake on 88 8V92 DD - Pete Masterson - 07-25-2009, 06:21
Installation of Jake Brake on 88 8V92 DD - dmb993@earthlink.net - 07-25-2009 08:21
Installation of Jake Brake on 88 8V92 DD - Pete Masterson - 07-25-2009, 10:51
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