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Old 08-13-2008, 04:00 PM   #1
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1990 25' Airstream 250
Bluffton , South Carolina
Join Date: Aug 2005
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Gonna keep it

Some time ago I listed my 1990 250 Classic for sale and had a lot of inquires but no one came to look and so I have decided to keep it. In line with that, I have started some upgrades. Most of them are a result of reading comments on this forum.
1. A friend has decided to sell his 1989 SOB and offered his gear - vendors overdrive. My 250 runs 3000 RPM at 60 MPH. I hope the GV will drop that to about 1800RPM at 60 MPH.
2. I have a small exhaust manifold leak noticeable on cold starting of the engine. The fix? Removing all the smog junk and installing a set of good quality headers.
3. Replacing the air cleaner with a cold air intake system.

I think these changes will all have benefit but I've been around 454 big blocks long enough to know they are not going to make a huge improvement in the 10 MPG I currently get. Maybe 2-3 MPG. I do know the noise level at 60 MPH will be reduced l with the GV's overdrive.

I would like to hear from those of you who have experience with these modifications.

Air bags, new shocks, and radial tires were some of the upgrades I did prior to my last major trip and all of those modifications resulted in big improvement in the overall handling of the MH.

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Old 08-13-2008, 04:07 PM   #2
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1967 26' Overlander
Huntsville , Alabama
Join Date: Dec 2003
Posts: 2,893
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Is aggravation worth added mpg?

Originally Posted by Pop Rivet View Post
... and offered his gear - vendors overdrive. My 250 runs 3000 RPM at 60 MPH. I hope the GV will drop that to about 1800RPM at 60 MPH...
454's develop max power at higher rpms. I suspect you will experience lots of shifting on hills.

The headers are a definite "plus".


1967 Airstream Overlander International
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Old 08-23-2008, 03:29 PM   #3
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1991 35' Airstream 350
Prince Frederick , Maryland
Join Date: Oct 2005
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I am quite happy with the gearvendors and the headmans I put on our 91 350. As fuel ecomomy is directly related to RPMs, you will find the 2 or 3K lower RPMs for a given speed you experience will definitely help. I get 12-15 MPG if I don't have to climb much, using the cruise control.

Note that with a GV, in downhill grades you are free-wheeling unless you do something to change that. This definitely helps with fuel economy, but requires vigilance--you can find yourself at 70 MPH, with a stoplight at the bottom of the hill!!! It helps to learn to downshift early and often on downgrades.

Best to all,

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Old 08-28-2008, 05:21 AM   #4
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1990 25' Airstream 250
Bluffton , South Carolina
Join Date: Aug 2005
Posts: 804
Images: 5
Thumbs up Modifications done on 250

Headers, cold air intake, and a overdrive have given this old motorhome a new attitude. Cabin noise has reduced as at aboout 60mph, the engine now runs at about 2000rpm. The overdrive dropped the rpm around 1000, I have not had a chanch to check mpg yet but I'm hopeful
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Old 08-29-2008, 07:16 AM   #5
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1989 34.5' Airstream 345
Silverton , Colorado
Join Date: Oct 2003
Posts: 2,101
My understanding is that you don't want to use GearVendors while driving in town or in hills/mountains...sure makes a nice difference on gradual highways, although we average 5-7 mpg with a toad...
Michael & Tracy
1989 345 Motorhome
We live for the moment, 'cause when you get there, it's gone...
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Old 08-29-2008, 08:31 AM   #6
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2011 34' Classic
Westchester Cty.NY , / Miami FL
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.... and that's where the term "yanking your chain" comes from.
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Old 09-07-2008, 06:49 AM   #7
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1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 286
Images: 5
So glad to hear you are keeping your 250! .............if only it had been for sale 12 months earlier, I might have bought it and shipped it back to the UK. I'm really happy with my 250 but have a secret desire for the red decals (mine are blue). I'm setting up a website dedicated to the 250 MH (it is widely held that there were less than 50 made). Keep your eye out and I hope I can post some of your pics on the site.
I'm working up the top ten reasons why the 250 is the best camper on the planet! First up is that you can take it to any state park in the US and drive it on small English country roads! I love my 250!

Good luck with you modifications. I watch with interest from over the pond.

Boom Sounds

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