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Slightly less piggish motorhome?

  #1  
Old 12-06-2018, 06:17 PM
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Post Slightly less piggish motorhome?

I know I could be laughed right out of here for this, but as most of my trucks are IDIs, this is a whole new world for me. We recently purchased a 32ft motorhome with the 6.8L. It's slow, which is very understandable. It is an 09 with 16,000 on it.

I see a lot of mention of regearing, but how low can I go? I don't want speed, but I do want to maintain 50mph up a big hill if I can.

Are these tuning chips available for working or are they more for people wanting more speed?

Anything else I should do over the winter before we set out on road trips?
 
  #2  
Old 12-06-2018, 07:09 PM
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50mph should not be a issue. What is the total weight of the rig? The 2v v10 isn't the most powerful but it should still pull to 50mph just fine. Figure a 6% grade would put you down to 2nd gear and 4500rpm that should keep you at 45 to 50mph.
 
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Old 12-06-2018, 10:50 PM
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depends on the pull! Ive been down to 30-35 on some pulls in colorado and no amount of throttle prior will keep it going. Its a 11 model 6.8 in a 14000lb rv. Get to a little pull and it will bog try to keep it going and it will get to 5K rpm then just slow down. dont know what if anything can be done, so I understand where the op is coming from. Dont know if the v10 with 3 valves is the answer, but they are only available in the bigger A class rv. BTW I've had the same issue on some pulls here in AZ not anywhere near the altitude of the pulls n colorado.
 
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Old 12-07-2018, 11:38 AM
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I'm not familiar with the 2 valve engines, but it seems like it should have little issue pulling 12,000lbs up a slight grade at 50mph. Check everything over? Maybe the air filter is clogged up? Just thoughts.
 
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Old 12-09-2018, 01:16 PM
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Dont be afraid to let it wind out, you'll be looking at 4 to 4.5 k rpms in 2nd at times, but that should still get you 50ish mph over most stuff.
Tranny tuning, shift points to me are the most benefit of the 5 star tuner.
I cant speak for the poster that sees 30-35 , maybe there are some hills that would do it, but mine seems to pull fairly well in 2nd up 6% windy road if i keep the rpms up.
 
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Old 12-10-2018, 07:13 PM
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Looks like part of my issue is shying away from RPMs much higher than 3k haha

I'll look into the 5 star tuner. I want to get a gauge on the trans. I have a bunch of e4ods and I've been burned before (haha get it?)
 
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Old 12-11-2018, 09:21 AM
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Yeah don't worry too much about the RPMs. The engine and transmission are set up for it.
 
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Old 12-11-2018, 08:26 PM
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If it's a 2009, it shouldn't have an e4od.
 
  #9  
Old 12-15-2018, 11:12 PM
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Originally Posted by Hank85713 View Post
some pulls in colorado..... 6.8 in a 14000lb rv.
Sounds like a n/a gas motor toting a blocky heavy load at high altitude to me. A turbocharged diesel engine would still make near the rated hp at 9,000 ft, whereas a n/a gas motor's hp is reduced by at least 30%. Probably a lot more, especially if the intake air temp is high. I don't think you can realistically expect it to hold highway speed pulling big grades, especially at high altitude or high density altitude.

Originally Posted by Hank85713 View Post
BTW I've had the same issue on some pulls here in AZ not anywhere near the altitude of the pulls n colorado.
I dont know about Arizona specifically but hot southern summer days are murder on a v10. A 100F day at my house (350ft elevation) in georgia will give intake air temps 150F+. That plus a density altitude of 3,000ft and 95% humidity calculates to a reduction in rated hp by over 50%. Now add in the parasitic loss of the a/c compressor, alternator and the 50hp the locked engine fan robs at 4000 rpm and you have a slow RV.

The 2 advantages the v10 has in all of this, is that the v10 costs a lot less (initial cost, maintenance, repairs) and it doesnt tear up all the time like the diesels do. I guess the hidden 3rd advantage is that if the v10 does break, it usually makes it on home anyway.

BTW, chips or tuners won't do a thing for high intake temps with the engine fan engaged.
 
  #10  
Old 12-21-2018, 01:42 PM
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Originally Posted by HMG_Auto View Post
Looks like part of my issue is shying away from RPMs much higher than 3k haha

I'll look into the 5 star tuner. I want to get a gauge on the trans. I have a bunch of e4ods and I've been burned before (haha get it?)
3V V10's come with a 5R110, Older 2V V10's came with the 4R100 or a ZF in some cases.

5star does specific RV tuning. Don't br afraid to let the V10 sing either.
 
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Old 12-22-2018, 01:26 PM
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Two things to consider here:

Is it a Class A or Class C? Class A will be 3-valve V10 because it's really an F53 chassis. Class C will be 2-valve V10 as it's an E450 Econoline (van) chassis.

In 2009, either one will definitely have the 5-speed Torqshift. Not sure when they switched over to the 6-speed.

It's 10 years old (probably produced in 2008) and it's only got 16K miles on it. Did you change the fuel filter, clean the MAF, and all the other general maintenance items?

Once we get that info, we can work on this more. Find out what the rear gear is too...
 
  #12  
Old 12-22-2018, 01:39 PM
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The 6R140 started with the 2016 F53 Chassis builds. It started in 2017 E series cutaway when ford finally used up the left over 2015 5.4 engines. For 2017 the 6.2 and 6R140 was available and the 6.8 also got the 6R140.
 
  #13  
Old 12-28-2018, 11:15 AM
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Gears... Will make a world of difference but not going to make it go faster just easier on the drivetrain.
i have know idea what gears they put in RVs, anything higher than 4:10 would be worthless.
 
  #14  
Old 12-29-2018, 01:58 PM
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cant help but think a 6 speed tranny would make a v10 an awesome tow rig. how about a retro fit kit, lol
 


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