Will It Hold together?

Reply Subscribe

Thread Tools

Search this Thread

Jan 29, 2008 | 07:57 PM

Hellonwheels

Thread Starter

Junior User

Joined: Apr 2007

Posts: 57

Likes: 0

From: Suffolk Va

Will It Hold together?

I have a 92 f-350 2 wd that is natural aspirated with 180000 miles on it. I used to get about 16.5 mpg highway going 55 with a 4.10 gear which i thought was pretty good. Since the speed limit changed to 65 round here the fuel mileage has really dropped. I have always wanted to put a ats turbo on it. I was wondering if my motor will come unglued if i install a turbo on an engine with this many miles on it.

Jan 29, 2008 | 08:35 PM

George D.

Posting Guru

Joined: Sep 2007

Posts: 2,207

Likes: 1

From: Las vegas

Should be fine 180,000 is barely starting to break the motor in.

Jan 29, 2008 | 09:22 PM

somedude

Junior User

Joined: Oct 2005

Posts: 74

Likes: 1

From: Prince george, B.C.

i did mine at 350000 kms and its great but my mileage is basically the same or worse
sometimes

Jan 29, 2008 | 09:42 PM

Dave Sponaugle

Post Fiend

Joined: Nov 2003

Posts: 21,285

Likes: 15

From: Nutter Fort, WV

The cruise RPM at 65 with 4.10 gears are killing the MPG unless you have an overdrive tranny.

You might be due for new injectors to get the MPG up some.

Jan 30, 2008 | 12:19 AM

casscodiesel

Junior User

Joined: Dec 2007

Posts: 50

Likes: 0

bigger tires will reduce your rpm's, the next best thing is regearing or getting s five speed trans

Jan 30, 2008 | 12:57 AM

CheaperJeeper

Posting Guru

Joined: Aug 2006

Posts: 2,175

Likes: 0

From: Kent WA

Quote:

Originally Posted by casscodiesel

bigger tires will reduce your rpm's, the next best thing is regearing or getting s five speed trans

Ditto. I have 4.10s too and swapping in a ZF 5-speed with a .77 OD 5th gear dropped my RPMs at 65 mph from around 2900 to 2200.

WHAT A DIFFERENCE! Not only is the fuel mileage much better, but it doesn't sound like it is straining just to get up to 70 mph either....

Regearing the axles or putting bigger tires will work too, but they not only raise your top end speed on the highway, they take away some of your bottom end too. To get the same effect on top end with gears you'd have to go all the way down to 3.08s, I know yours is 2WD, but for the 4WD guys you've got to do both axles - for about a grand per axle

To get the same amount of top end improvement with bigger tires you'd have to go from the stock 235/85/16 (31.7" diameter) to a 41" diameter tire. That's pretty big, and even if you went with some 35's or 36's you'd only get about half as much improvement as you would with the 5 speed.

IMO, the 5 speed or an OD like a Gearvendors is the only way to go...

Last edited by CheaperJeeper; Jan 30, 2008 at 01:07 AM.

Jan 30, 2008 | 05:17 PM

Hellonwheels

Thread Starter

Junior User

Joined: Apr 2007

Posts: 57

Likes: 0

From: Suffolk Va

I appreciate the information. Yes i have an e4od with overdrive. I dont want to put a taller gear in the truck because it has to pull i lubrication trailer to the job. Load with oil and grease that trailer can get pretty heavy.

Trending Topics

F550 First Trip, Heavy tow, Noises / shudder

21

638
The correct Carb? Tranny matters?

19

298
Looking for a canopy

14

300
Spark plug gaps vs AFR vs Heat buildup

15

266
Mustangman7 Restores A 1975 F150 Ranger XLT Supercab

34

864

Jan 30, 2008 | 07:34 PM

CheaperJeeper

Posting Guru

Joined: Aug 2006

Posts: 2,175

Likes: 0

From: Kent WA

Quote:

Originally Posted by Hellonwheels

Well, if you already have the OD, then that isn't an option for you. Just goes to show that what our old buddy Dave Sponaugle says is really true. Your right foot has more effect on your fuel mileage than anything else!

I'm assuming you've been running some fuel addative to keep the pump & injectors nice & clean, and the timing has been checked so that everything is running as well as it can. Have you considered (or already done) a K&N airfilter and some intake/exhaust mods to help it breathe better? Those are good for a couple mpg at least...