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Old 09-28-2019, 07:10 AM   #1
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Where is all the power?

Hello all. We have a 2005 Beaver Marquis with a Cat C-13 525 hp engine. While I don't expect her to run like she has an afterburner, she struggles going up even moderate grades. Runs fine on level surfaces and purrs like a kitten ,(sorry), I thought she would have more power and maybe she does. Any thoughts would be appreciated and as always, thanks.
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Old 09-28-2019, 07:36 AM   #2
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Fuel filters partially clogged and leaks in the induction system are prime power robbing issues.

If not replaced within a few thousand miles, try replacing the fuel filters. Diesel fuel is a dirty fuel.

For air leaks in the induction system, listen for a whoosh sound, while under load, climbing a hill. Have someone drive while you listen.
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Old 09-28-2019, 09:35 AM   #3
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X2 on the fuel and air filters as a first shot of fixing.



What kind of boost pressure are you seeing? No boost >>> no power



Can you tell if your exhaust brake is working properly, is it engaging and disengaging the way it should. I've read of exhaust brakes sticking causing power issues.
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Old 09-28-2019, 09:59 AM   #4
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How long have you had this coach?
Was it sitting for a long period? And if it was, what part of the country was it?

I agree with Twinboat. When you order fuel filters, get at last two of each and always keep a spare set on hand.
You may try downshifting to 5th just before steep hills to see if that helps.
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Old 09-28-2019, 10:05 AM   #5
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Check air filter hasn't collapsed or previous one did and blocking up piping.
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Old 09-28-2019, 10:58 AM   #6
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With 525hp you should have more than enough power for climbing hills, as others have said sounds like a good possibility you have a fuel, air filter etc. problem.
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Old 09-28-2019, 09:21 PM   #7
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I think those cats should pull close to 30psi at full throttle. At least 28

And you might try the cat forum if you still got issues after filters.
http://www.irv2.com/forums/f124/
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Old 09-28-2019, 10:13 PM   #8
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In your fuel bay, RR bay of the coach, do you have a Racor primary, water, fuel, primer filter housing that is common on the Beaver brand coaches?


Will wait for your reply
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Old 09-29-2019, 04:29 AM   #9
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Quote:
Originally Posted by jimmy braden View Post
I think those cats should pull close to 30psi at full throttle. At least 28

And you might try the cat forum if you still got issues after filters.
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That C13 is twin turbo. It puts out 48 psi boost max (on engine dyno). You should see around 42 psi at full load.

Get a ScangaugeD or similar monitor, so you watch the engine ECM data as your driving. The ScanGauge shows boost, engine load %, air intake temp, and other data that can be useful in determining engine performance/problems.

On the Beavers they used a "push-connect" fuel line fitting at the primary fuel filter (Raycor) and engine fuel pump (and at tank) these push-connect fittings are known to suck air (and cause loss of power).

It is recommended to replace them with standard compression fittings (usually 5/8" or 3/4" OD line to 1/2" NTP fitting).
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Old 09-30-2019, 07:21 AM   #10
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Thank you all.
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Old 09-30-2019, 09:14 AM   #11
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Probably fuel filter related, but;

Monaco put a small 11" 1200 CFM Ecolite filter on mine with the ISX. I put a larger 13.5" 1500 CFM Ecolite filter on and my hill climbing improved dramatically. Also look at the intake on the side of the coach. The tube on mine went almost to the top of the intake housing which also restricted flow, I cut mine shorter. I'm happy after those two mods.

Your Cat should have similar airflow to my Cummins which needs 1227 CFM.
https://powertherm.com/PT2/images/PD...ion251-258.pdf
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