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 > Engine braking now vs then.

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4x4ord

Alberta

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Posted: 07/21/19 08:03am Link  |  Quote  |  Print  |  Notify Moderator

In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph. Second gear was a run away. In 2011 I went over the same pass with the same trailer using a 2011 Powerstroke. The engine was able to hold the trailer back in 2nd gear at about 3600 rpm and 45 mph. This year with 25000 lb gcvw my 2017 Powerstroke had no trouble what so ever maintaining 55 mph in 3rd gear at 2900 rpm. It was just a matter of setting the cruise and letting the automatic exhaust brake do its thing. There are a couple tighter bends in the road that prompted me to brake slightly to drop a few mph and then press resume on the cruise. The turbo boost would rise or fall depending on how much exhaust braking was required to maintain 55 mph. I was very impressed.


2017 F350 SRW Platinum short box 4x4.
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JRscooby

Indepmo

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Posted: 07/21/19 08:18am Link  |  Quote  |  Print  |  Notify Moderator

The first time I pulled a load with a diesel I realized that the diesel would not hold the load back as well as the old spark plug motor. Then I found the joy of a Jake.
A test I would like to see is same size gas engine compared to diesel/exhaust brake with same weights

jbc28

Gadsden, AL

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Posted: 07/21/19 08:26am Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph. Second gear was a run away. In 2011 I went over the same pass with the same trailer using a 2011 Powerstroke. The engine was able to hold the trailer back in 2nd gear at about 3600 rpm and 45 mph. This year with 25000 lb gcvw my 2017 Powerstroke had no trouble what so ever maintaining 55 mph in 3rd gear at 2900 rpm. It was just a matter of setting the cruise and letting the automatic exhaust brake do its thing. There are a couple tighter bends in the road that prompted me to brake slightly to drop a few mph and then press resume on the cruise. The turbo boost would rise or fall depending on how much exhaust braking was required to maintain 55 mph. I was very impressed.


They do work well. If you were using cruise the service brakes may have been coming on too.


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SidecarFlip

SE Michigan

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Posted: 07/21/19 09:04am Link  |  Quote  |  Print  |  Notify Moderator

Never like the term'Jake Brake'. Jake Brake is a trademark of the Jacobs Corporation not a type. There are 3 types, compression brakes (jake), exhaust back pressure brake (Blue Ox and others) and mechanical retarders.

Not sure which type different builders use. I have a Blue Ox on my 1997 7.3 and it works quite well actually bit I only use it manually when the need arises.


2015 Backpack SS1500
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Cummins12V98

on the road

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Posted: 07/21/19 09:28am Link  |  Quote  |  Print  |  Notify Moderator

Modern exhaust brake equipped trucks are DA CHIT!!!

33k combined down several miles of 14% locked in second maintaining 30-35 with cruise control on. Brakes nice and cool at the bottom!

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2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
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"HeavyWeight" B&W RVK3600

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2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD

Gulfcoast

Alabama

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Posted: 07/21/19 10:58am Link  |  Quote  |  Print  |  Notify Moderator

Sure wish I had an exhaust brake on my Cummins 5.9, but I simply can't afford $1500 for the kit and $1000 labor. Surely there's something out there cheaper.

Old-Biscuit

Verde Valley

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Posted: 07/21/19 11:44am Link  |  Quote  |  Print  |  Notify Moderator

"In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph."

2003 Duramax LB7-----REV Limiter set at 3250 rpm

[emoticon]



I have a US Gear 4" exhaust brake on my 5.9L Cummins
Truck/trailer combo 22k
Exhaust brake 6% grade----55 mph
Glad to see exhaust braking OEM ------ great tool for diesel trucks


Is it time for your medication or mine?


2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
On the Road Debt Free April '07
Off the road still Debt Free Jan. '14

Chris Bryant

Arden, North Carolina

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Posted: 07/21/19 12:42pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

"In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph."

2003 Duramax LB7-----REV Limiter set at 3250 rpm


The rev limiter won’t do anything for an engine braking over-rev, but if it’s limited to that 5k can’t have been good for it.


-- Chris Bryant

ktmrfs

Portland, Oregon

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Posted: 07/21/19 05:05pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

"In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph."

2003 Duramax LB7-----REV Limiter set at 3250 rpm

[emoticon]



I have a US Gear 4" exhaust brake on my 5.9L Cummins
Truck/trailer combo 22k
Exhaust brake 6% grade----55 mph
Glad to see exhaust braking OEM ------ great tool for diesel trucks


nope! duramax with grade brake or exhaust brake shuts off fuel and will rev to 5000rpm. friction increase as the cube of RPM so doesn't take much increase in rpm to increase braking.

If duramax goes above 5,000 it will shift up a gear regardless of what the gear slector is in. That's why the tach goes to 5K. And why GM eliminated the redline above 3200 because people weren't reading the diesel suppliment owners manual on how the grade brake/exhaust brake works and what rpm it can go to.

To the OP's comment. I had (son now has) an 04.5 duramax with grade brake only, and now a 15.5 with exhaust brake. While the grade brake feature provides significant retardation, it is no where near as effective as the exhaust brake.


2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


FishOnOne

The Great State of Texas

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Posted: 07/21/19 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

In 2009 I towed our 5ver over the Creston Salmo pass in BC with an 03 Duramax. I manually placed the truck in low gear and listened to the engine rev to over 5000 rpm as it struggled to hold back the gcvw of about 21000 lbs... about 35 mph. Second gear was a run away. In 2011 I went over the same pass with the same trailer using a 2011 Powerstroke. The engine was able to hold the trailer back in 2nd gear at about 3600 rpm and 45 mph. This year with 25000 lb gcvw my 2017 Powerstroke had no trouble what so ever maintaining 55 mph in 3rd gear at 2900 rpm. It was just a matter of setting the cruise and letting the automatic exhaust brake do its thing. There are a couple tighter bends in the road that prompted me to brake slightly to drop a few mph and then press resume on the cruise. The turbo boost would rise or fall depending on how much exhaust braking was required to maintain 55 mph. I was very impressed.


The 2020 Super Duty's will have even a stronger turbo so it'll be interesting to see if there's better exhaust brake performance to an already great performing exhaust break.


'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs
"Built Ford Proud"
'16 Sprinter 319MKS "Wide Body"


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