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Old 03-25-2011, 10:56 AM
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2002 stock PSD questions.

Hey all,
I am trying to add some performance to my truck, and need some help. I bought a used 2002 F-350 PSD with a 7.3L Diesel engine and is a Dually. I am running into what I think are some upgrades to the truck, but I don't really know for sure.
I started with the exhaust, because the old one was rotting out. I put a single stack on it. 4" turbo back, no cat, no muffler, 5" exit to an 8" single stack. Now I'm working on getting some air into the motor with a DIY intake. I'm thinking that a better HPOP should be next.
Anyhow, I am sure that the auto trans is a 5 speed, and it seems to shift hard, like it has a shift kit in it. Is a 5 speed stock? I am asking because it has a metal Jasper rebuild tag on it, and the case says A400? Is that trans. stock? I found the old sticker, and the previous owner appears to have requested a 4:11 rear end, and the RPM @ 70 MPH is about 2800-2900, does that sound right???? The turbo has Garrett on it, is that a stock turbo????
I am looking to get a good mix of performance, and mileage of course, but I am just wondering where I'm starting from????
It seems that if i have a good turbo, that I can tell the guys at DP Tuner what I have, and the same with the trans...
Maybe I already have a chip in it, and just dont know.
Any help would be appreciated.
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Old 03-25-2011, 11:30 AM
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stock tranny is 4R100 (EDIT: thanks, corrected)
2800 rpm is horrible on mileage. stock gear is 3.73 iirc. so that 4.11 was bought as an option
the Garrett is stock

get turnes for your first upgrade, but its hard to say if it already has tunes loaded. a chip is install physically on the ecu. but i dont know how to tell if a tune is loaded.

Last edited by ridiculously_necessary; 03-25-2011 at 12:59 PM.
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Old 03-25-2011, 11:56 AM
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stock on an 02 is a 4r100 wich is a 4speed and with it being a dually it probly had 4.10's from the factory and garret is the stock turbo
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Old 03-25-2011, 12:07 PM
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HPOP should be fine until you get bigger injectors. I'd go with custom tunes first.

The tranny acts like a 5 speed, but it's just a 4 speed. I believe it shifts like 1 - 2 - 3 (tc unlock) - 3 (tc locked) - 4
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Old 03-26-2011, 05:20 AM
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Thanks for the advice.... I've been trying to go the cheapest/easiest route as possible. Therefore I went with the open exhaust for flow.... I am working on getting air into the turbo right now....
My thinking was to go with a better HPOP, and then bigger injector nozzles.

THEN I thought I'd go for some tunes. DP Tuner seems to be the route I was thinking on going??? Better tuners?? I also thought of the EDGE CTS, because of the built in gauges on the screen that could save money. It seems that DP has better tuning options though??? I like the exhaust brake tune that they offer. It seems to me that my truck shifts into 4th at approximately 40 MPH... Then it's running like 1100/1200 RPM...This seems to be good for mileage, and I've learned to go 40 let it shift then as long as I keep the throttle imputs lite I can run at that RPM.... Does DP control the trans better than the others??? they seem to from what I've read. I still cannot stp thinking about the edge, because of the gauges.... That can all be expensive....
What are the best tuners for mileage, and performance.
What tunes should I get before I go for upgrades??? Can I change/ad tunes later????

I'm new to this, and NEVER had a diesel engine..... I'm just going on common sense gasoline engine stuff....
ADD air through the intake, flow it better through the exhaust, Add more fuel, change the cam, pistons, rods, crank......ect.....
I'm seeing that the BEAUTIFUL thing with a diesel engine is that you can leave the motor alone when you add fuel. AND you have complete control with the transmission locking and getting it to shift electronically wherever you want.
This stuff is all very cool!!!!!
So should I go for DP Tuner, and gauges next??? OR The edge tuner with the gauges already in it?????
I'm not looking for too many options, just want to keep it simple....
Mileage TOWING power High performance maybe smoke for fun!!!!
My head is spinning....
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Old 03-26-2011, 07:02 AM
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get a good set of gauges and its a good idea to atleast put a better valve body in the trans to help it out for when you chip it. as far as chips or tuners go there are alot of good ones. i used to run a dp but inow i run swamps tuning. tony wildman or cale at tyrant diesel (BTS) tune really good as well. a regulated return is a good mod for these trucks and well worth the money imo. an upgraded hpop will help only if yours is weak but imo also a good upgrade.......
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