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09-06-2018, 07:26 AM
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#1
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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How to test VVT engine brake on C9
Does anyone know how to test the engine braking function on a C9 with the VVT turbo (425 hp)? When I turn on the ‘engine brake’ switch, the engine downshifts but I don’t feel any more braking resistance than when I just downshift manually. I know the VVT braking is pathetic at best but want make sure it is working.
__________________
2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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09-09-2018, 07:36 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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A CAT shop can plug into the ECM and run a test on the VVT to see if it responds correctly. However, if it did not work you would get a code and it would be noticeable with respect to engine performance.
I think your question is more about is the Exhaust Brake "command" getting to the ECM to tell VVT to close? The CAT shop scan tool would indicate if there is a command for exhaust brake to apply.
The only way I can think of to test this without CAT ET tool, would be to put a back pressure gauge in the exhaust manifold (before turbo) and see if the back pressure increases when the exhaust brake command is given.
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09-09-2018, 07:35 PM
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#3
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Senior Member
Join Date: Jan 2005
Posts: 1,447
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Sounds like you've already done this, but manually downshift then turn on the brake, that way if there's any difference at all you'll be to tell.
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09-10-2018, 09:16 AM
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#4
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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Yeah, that’s how I noticed that using the engine brake didn’t offer any more braking than just downshifting. I’ll have my mechanic check out with the Cat software. Thanks for the replies.
__________________
2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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09-10-2018, 09:41 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: May 2015
Location: Where I happen to land
Posts: 2,529
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If you find a better braking system, please share. I haven't found it. I have read that the older C9 with no VVT used an exhaust brake and was far superior.
__________________
John and Debi
2008 Beaver Contessa, 2005 Jeep Grand Cherokee,
28 years retired Fire Captain Tales of the Muttley Crew
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09-10-2018, 09:47 PM
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#6
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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Quote:
Originally Posted by Captjake1
If you find a better braking system, please share. I haven't found it. I have read that the older C9 with no VVT used an exhaust brake and was far superior.
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Yep. Ours appears to be the worst possible engine brake there is...damn!
__________________
2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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09-13-2018, 10:39 AM
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#7
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Senior Member
Join Date: May 2013
Posts: 122
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i need some education here. my motorhome is identical to tank cjs and the good captains, except my serial number identifies my engine as a 2006 400hp- no ard, dpf, pos, sob etc. i have always believed i had a pac brake [brand name] style exhaust brake, but i have never had reason to investigate. how do i determine if i have the vvt instead, other than its different from a pac brake? my understanding is that the vvt didnt show up untill the ard/dpf era
__________________
2008 40' Beaver Contessa
Fulltime RVers with toys.
Sandcar, Razor, and a Jeep. Where we play is where we sleep.
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09-13-2018, 12:39 PM
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#8
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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Quote:
Originally Posted by DanKathyC
i need some education here. my motorhome is identical to tank cjs and the good captains, except my serial number identifies my engine as a 2006 400hp- no ard, dpf, pos, sob etc. i have always believed i had a pac brake [brand name] style exhaust brake, but i have never had reason to investigate. how do i determine if i have the vvt instead, other than its different from a pac brake? my understanding is that the vvt didnt show up untill the ard/dpf era
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A cat expert needs to chime in but I am very sure you have a pac brake. Only the 425 hp C9-S has the VVT. I believe you also have the HUEI pump for the injectors whereas I have the common fuel rail. You are a lucky one!
__________________
2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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09-13-2018, 01:07 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: May 2015
Location: Where I happen to land
Posts: 2,529
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Agreed. As I understand, the VVT was only used on the DPF equipped units.
__________________
John and Debi
2008 Beaver Contessa, 2005 Jeep Grand Cherokee,
28 years retired Fire Captain Tales of the Muttley Crew
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09-13-2018, 01:59 PM
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#10
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Senior Member
Join Date: Jan 2005
Posts: 1,447
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Quote:
Originally Posted by DanKathyC
i need some education here. my motorhome is identical to tank cjs and the good captains, except my serial number identifies my engine as a 2006 400hp- no ard, dpf, pos, sob etc. i have always believed i had a pac brake [brand name] style exhaust brake, but i have never had reason to investigate. how do i determine if i have the vvt instead, other than its different from a pac brake? my understanding is that the vvt didnt show up untill the ard/dpf era
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What's your engine serial number? I'll check the build sheet on it.
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09-14-2018, 10:13 AM
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#11
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Quote:
Originally Posted by tankcj
A cat expert needs to chime in but I am very sure you have a pac brake. Only the 425 hp C9-S has the VVT. I believe you also have the HUEI pump for the injectors whereas I have the common fuel rail. You are a lucky one!
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He says in the first post that he has the 425HP with VVT (the C9-S).
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09-14-2018, 10:24 AM
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#12
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2010
Location: Lake Havasu City, AZ
Posts: 1,717
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Quote:
Originally Posted by CountryB
He says in the first post that he has the 425HP with VVT (the C9-S).
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I was the first post (I have a 425)...I was answering DanKathyC. He said he had a 2006 400 hp.
__________________
2019 Newmar Dutch Star 4328 K2
2017 Grand Cherokee Summit 5.7
2008 Beaver Contessa 40' Pacifica 425 Cat
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09-14-2018, 02:41 PM
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#13
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Quote:
Originally Posted by tankcj
I was the first post
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Oops. 
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09-14-2018, 05:34 PM
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#14
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Senior Member
Join Date: May 2013
Posts: 122
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Quote:
Originally Posted by Cat
What's your engine serial number? I'll check the build sheet on it.
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9dg10304. i currently believe it has an exhaust brake incorporated into the turbo housing
__________________
2008 40' Beaver Contessa
Fulltime RVers with toys.
Sandcar, Razor, and a Jeep. Where we play is where we sleep.
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