"New" Old PSD owner, seeking pearls of wisdom - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 01-19-2007, 07:16 PM Thread Starter
 
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"New" Old PSD owner, seeking pearls of wisdom

I recently became the proud owner of an early 1999 F-250 superduty Lariat Crew Cab automatic 4X4 with 205k miles. Well, that was a mouthful! I have been very impressed with the spaciousness of the cab, the comfort of the ride, and the power and acceleration that the truck exhibits when merging onto the interstate (or just passing some guy cruising at 48mph while talking on his stinking cellphone) :shootself:

I have new 305/75R16’s all the way around , a K& N intake, and everything else appears to be stock. I have been “given permission” to modify the truck, ostensibly, to “…increase its performance while maximizing economy”. (That's my story, and I'm sticking to it) Of course, these modifications will be done incrementally, as there are cosmetic/ancillary issues that the bosslady has placed on my Honey-do Truck list – like new seating surfaces, repairing/replacing the power seat motor, sliding rear window latch, Master window switch, driver’s side power mirror, locking hubs, etc.

Given that these trucks are infinitely customizable, and my desire for power and torque to haul my little horse trailer and homewoner-sized Kubota tractor/loader is balanced by my need for the same or better fuel economy, please rate the following modifications in order of desirability:

1) upgrade post-turbo down tube to 4”, and run minimum of 4” exhaust with a Walker BTM
2) Replace K&N Intake with another intake system
3) Install a pyro, pyro gauge and chip/tuner (which?)
4) Upgrade injectors

Thanks, and I look forward to your response(s). :bow:

P.S. At a speedo reading of 60 mph with NO O/D, I'm turning 2250 RPM. With O/D I'm at 1750. IS this normal, or should I look into changing the diff?
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post #2 of 3 (permalink) Old 01-19-2007, 07:52 PM
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My thoughts on your engine mods:

1 Replace air intake if it is a K&N DROP IN FILTER. If it is a K&N FIPK or whatever (has a cone filter on the end of a tube) you have about as good as anything. I would not worry about it unless you want better filtration (Paper element)

2 Turbo back exhaust. 3.5" Downpipe will give better response if you are going to use as a daily driver/tow vehicle. All out power go 4"

3 Install Gauges - Pyrometer, Boost, and Trans Temp

4 Get a Chip. Cant go wrong with any of these: Tony Wildman, DP-Tuner, Eliete Diesel. Please note that Tony will reburn your chip for FREE as long as you own it!! I am not sure about the policy on the others.

5 Injectors and reburn chip.

As for your RPM at 60, I would say that is about optimum RPM (in OD) for economy while empty or light towing. Of course if you drive 85 MPH all the time you would be better off with a higher gear ratio (numerically LOWER)

Eric
96 F-350 CC Dually My TDG Gallery
B codes, head studs, Comp 910 valve springs, stock turbo w/ 1.00 turbine housing
6.0 IC, NAPA 6637 air filter, AeroTurbine 4040XL, ITP Overboost Annihilator,
Quadzilla Commander, electric fuel system w/ regulated return
coolant filter, 203* thermostat
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346.7HP, 852.1TQ 12/15/07 Greeley, CO w/ stage 1 injectors and Wildman tunes
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post #3 of 3 (permalink) Old 01-19-2007, 07:53 PM
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First off, congrats. on the purchase. Since your pulling a trailer and looking for better fuel economy, i would look at new exhaust and intake. Is the current K&N intake a rather recent install or older? if a newer add-on, should be fine. Then nex would be guages, chip/tuner. Injectors would be towards the bottom of the list of addons for me.
I would look into replacing the exhaust so that the truck can breath better. Guages are a necesity once you start adding more power to monitor the trucks status. a EGT guage, boost guage, and tranny guage seem good as starters (tranny mainly for your pulling of trailer)
im not sure what kind of chip would be good but i would recomend superchip so you can set it and be done. I would also recomend the Bullydog flip switch chip thats adjustable in cab and on the flly.
thats my 2cents and hope that helps some!

96 Dodge Cummins EC LB 5 spd big valve springs, full cut DV's, Big sticks, phat shaft turbo....yada yada yada.... plain and simple, it goes fast and pulls whatever
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