PLEASE HELP
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Joined: Oct 2010
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PLEASE HELP
Hey guys I have some major questions. I drive a 1990 F 350 7.3 IDI with a Banks sidewinder turbo. Today I went and picked up my new fifth wheel in Phoenix. On the drive back I had all kinds of problems. First and most important, I was pushin the redline on the tranny, barely going 60. Boost was at 10-12, and that was a fast as I could go. When I took it out of over drive I cooled the tranny a little, but the rpms of course were at 2800. So my main question is what wrong with my truck. Is this the top speed I can expect from my truck. It only an 8500 lbs trailer. Worde off I had to go thru a litle pass on the way home nothing major and top speed was 40. I dont know a whole lot but I dont think this sounds right.
Second major problem is I only got 6mpg on the way home. Thats dismal. Please any and all thoughts, comment would be a huge help. I love my truck but the wife says that if I cant get the mpg up and if the truch cant preform better we're gunna have to trade it in. Please help guys. Thanks in advance
Second major problem is I only got 6mpg on the way home. Thats dismal. Please any and all thoughts, comment would be a huge help. I love my truck but the wife says that if I cant get the mpg up and if the truch cant preform better we're gunna have to trade it in. Please help guys. Thanks in advance
Posting Guru
Joined: Feb 2011
Posts: 2,216
Likes: 0
From: Princeton MN
Does the tranny have an aux cooler cuz it should? And you should never be towing in od. Try taking the fuel filter off and filling it full of diesel kleen. It my help loosening up the fuel system. At 24,000 ive only pulled my mileage down to between 9 and 10 depending on the weather. But the air is thinner at high altitudes and horsepower and mileage will take a noticable hit
Posting Guru
Joined: Feb 2011
Posts: 2,216
Likes: 0
From: Princeton MN
That means you have 4.10s. those are ideal gears for towing. Id keep it at around 65 max these motors are governed at 3300. Id say just back off to 65 and enjoy the ride that should help the milage some. As for the od any ratio in tha trans that is not 1to1 makes heat. the od was only intended to move the empty truck itself.
Senior User
Joined: Feb 2011
Posts: 126
Likes: 0
From: Sequim, WA.
MPG?
Hey guys I have some major questions. I drive a 1990 F 350 7.3 IDI with a Banks sidewinder turbo. Today I went and picked up my new fifth wheel in Phoenix. On the drive back I had all kinds of problems. First and most important, I was pushin the redline on the tranny, barely going 60. Boost was at 10-12, and that was a fast as I could go. When I took it out of over drive I cooled the tranny a little, but the rpms of course were at 2800. So my main question is what wrong with my truck. Is this the top speed I can expect from my truck. It only an 8500 lbs trailer. Worde off I had to go thru a litle pass on the way home nothing major and top speed was 40. I dont know a whole lot but I dont think this sounds right.
Second major problem is I only got 6mpg on the way home. Thats dismal. Please any and all thoughts, comment would be a huge help. I love my truck but the wife says that if I cant get the mpg up and if the truch cant preform better we're gunna have to trade it in. Please help guys. Thanks in advance
Second major problem is I only got 6mpg on the way home. Thats dismal. Please any and all thoughts, comment would be a huge help. I love my truck but the wife says that if I cant get the mpg up and if the truch cant preform better we're gunna have to trade it in. Please help guys. Thanks in advance
Now before anyone gets angry with me...this is just my opinion...and everyone...and I mean everyone...has the right to one...right or wrong...
Look down at my signature and check my mileage...it's true...but...and this is a big but...I never drive over 55 mph...sometimes even slower...LOL
Pete
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
I never did get it why people have these old trucks, towing trailers and expect it to keep up with newer rigs in every environment.
The OP's truck might just be in need of a tune up if it's that bad...
IP, injectors etc. and have it timed will do miracles!
I also drive at a minimum, I never go over 60! I push out 12mpg with my non turbo 3 speed auto. 6.9 Motorhome. That's also on cruise control.
No hurry when your traveling.
The OP's truck might just be in need of a tune up if it's that bad...
IP, injectors etc. and have it timed will do miracles!
I also drive at a minimum, I never go over 60! I push out 12mpg with my non turbo 3 speed auto. 6.9 Motorhome. That's also on cruise control.
No hurry when your traveling.
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Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
First how many miles on the injectors and IP are the return lines, injectors painted grey.
What is the axle ratio on the door post sticker....... Does the trans have a cooler installed...if not get one.
What size tires do you have.......
Was any smoke visible when towing.......black/white????
What is the axle ratio on the door post sticker....... Does the trans have a cooler installed...if not get one.
What size tires do you have.......
Was any smoke visible when towing.......black/white????
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The way it sounds, with you not being able to push small passes even with a turbo, your injector pump has got to be tired or your injectors are wore out. I could pull a 6500lb trailer over Mt Hood and the Santiam Pass with my old 86 6.9 non-turbo in 3rd gear at 45mph all the way up. If I got stuck behind a semi crawlin it, well then I couldn't get her back up to that speed. My new 7.3 with the Banks Sidewinder will pull 2 of those trailers before it starts lagging like the old 6.9NA.
