recurry
Pleasanton, CA
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Joined: 01/21/2008
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Diplomat Don,
I'm aware that the amount of braking you get is dependent on engine RPM (not speed). All exhaust brakes work that way. I think the person you spoke to was misinformed though. Here is what PACBrake has to say about the PRXB:
PACBrake wrote:The problem in the past has been that as a motorhome slows down, the RPMs also come down and you lose backpressure, resulting in a loss of braking power. The PRXB addresses this very issue with a patented air valve that is designed to close as the engine’s RPMs begin to drop. The closing of this valve creates higher backpressure and therefore higher braking horsepower. At 1200 RPM the PRXB will create the same braking power as a traditional exhaust brake does at 2200 RPM. The net result is that the PRXB provides much better braking over a much wider RPM range than its predecessor or competitors.
They have a 30 day money back guarantee. If it didn't perform as claimed that would be a very risky and costly thing for them to do. Considering the installation time is less than an hour the risk to us is very low. Getting the same braking power at 1200 (which is cruise speed) that I formerly got at 2200 RPM is a big - I repeat BIG! - improvement. That and the fact that 3 or 4 people have already responded that it made a BIG and positive improvement has me ready to pull the trigger.
You might want to re-evaluate your decision if you'd like more braking.
Regards,
------------
Ron
N6QL
2002 36' Country Coach Allure 350HP Cummins
2001 Jeep Wrangler Sahara
1978 Cessna T210M
My Flying
My website
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bilwil
Casa Grande, AZ
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Joined: 12/07/2007
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Could some one tell me the difference between a regular PACBrake and the PACBrake PRXB. I have a regular one on my 94 C 8.3 which works poorly(slowing down hills). It is adjusted properly but does little good on down grades. Is there a pop off on the butterfly? or hole? Even running high RPM.
Thanks
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recurry
Pleasanton, CA
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Joined: 01/21/2008
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bilwil wrote:Could some one tell me the difference between a regular PACBrake and the PACBrake PRXB. I have a regular one on my 94 C 8.3 which works poorly(slowing down hills). It is adjusted properly but does little good on down grades. Is there a pop off on the butterfly? or hole? Even running high RPM.
Thanks
Read the quote from PACBrake in my post above. It explains the difference. You can also go to their website http://www.pacbrake.com/index.php?page=prxb-exhaust-brakes-2
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bilwil
Casa Grande, AZ
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Thanks, that helped, still wondering why some of the older units work better than others when adjusted the same. My friend has the same power train and weight as mine and his pacbrake works a lot better? O well, need to upgrade :-)
Thanks again
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deandec
El Dorado Hills, CA
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Joined: 09/26/2001
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The place I really need the PacBrake is down the mountain grades. My engine remains at high RPM during the downgrade so evidently the old PacBrake is (per PACBrake quote above) as good as the newer model.
A engine compression brake would be nice.......
Dean
95 CC Magna Jeep GC
(Vietnam Vets may be eligible for medical care and disability compensation. Contact the VA if you have prostate cancer or type 2 diabetes.)
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Sully2
Cincinnati
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Joined: 01/20/2003
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The improved PacBrake is on my "to do " list for sure. Personally I think the std PacBrake is one notch about dragging your feet!! ..and also..Id give $4000 for a true 2 stage Jake on my rig!
Ive ridden in ( stinker wouldnt let me drive it though..lol) a coach with a Jake.. NO COMPARISON!!
This past year I havent been able to get jack squat done to my rig because of outside reasons..but the improved brake is definately on the "to do" list!
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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v8q
Oviedo, FL
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Joined: 04/11/2005
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deandec wrote:The place I really need the PacBrake is down the mountain grades. My engine remains at high RPM during the downgrade so evidently the old PacBrake is (per PACBrake quote above) as good as the newer model.
A engine compression brake would be nice.......
The PRXB works significantly better. All you have to do is downshift for more braking force. On my 93 U280 with C8.3 I would settle in at 45 mph in 3rd gear and purr down a 6% grade.
Dave Head
Oviedo FL
95 Foretravel U320C SE
M11, HD4060
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recurry
Pleasanton, CA
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Joined: 01/21/2008
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Sully2 wrote:The improved PacBrake is on my "to do " list for sure. Personally I think the std PacBrake is one notch about dragging your feet!! ..and also..Id give $4000 for a true 2 stage Jake on my rig!
Ive ridden in ( stinker wouldnt let me drive it though..lol) a coach with a Jake.. NO COMPARISON!!
This past year I havent been able to get jack squat done to my rig because of outside reasons..but the improved brake is definately on the "to do" list!
I agree I've ridden and driven coaches with Jake compression brakes and they offer much more braking power. Unfortunately neither Jake or PACBrake makes a compression brake for our engines (the '98 to '02 ISC).
Based on the comments here I'm going to do the upgrade also - at the same time I install the Banks PowerPack I just bought!
Cheers,
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shirlock1
McLean VA
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Joined: 11/29/2007
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I have a 99 dutch star with the 300 hp cat and an exhaust brake. Is this the same as the Pac Barke that is discussed above. I get some effective braking from it but not what I would like. Do all of the comments apply to this as well or is mine a different animal (kitty CAT)?
Thanks
1999 Newmar Dutch Star
Cat 300 Allison 6 spd
1992 Suzuki Samurai
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v8q
Oviedo, FL
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Another option is the US Gear exh brake - it uses a waste gate. The PRXB uses a spring loaded plate.
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