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What should I tune on my 7.3?

4887 Views 15 Replies 9 Participants Last post by  AgTires4295
Hey Guys!

I just picked up a '99 F-250, with only 170 miles on a 7.3L diesel, regular cab, eight foot box.

I've done a K&N cold air intake on it already. What else can I do to get more horsepower and torque?

-Magnaflow exhaust?
-Ramping, stacking the CPU?
-I wanna keep the stock injectors.

I want the truck to operate more effortlessly, smooth, and free flowing.
I still wanna keep good fuel mileage.
By the way, I haul a thousand pound welder in the box all the time.

Thanks!
Welder Dude.
1 - 16 of 16 Posts
Put a diy intake on it instead, make the exhaust free flowing, get gauges, a valve body, and custom tune it. You can't stack anything

I made my Samsung SGH-I997 send this.
If you want that truck to last, stop modding it and start reading up on it before you continue.

K&N will kill the truck and you can't stack chips. Start with the basics, a intake that actually filters out dirt, exhaust, gauges and a chip from DP, TW, PHP, etc.
Put a diy intake on it instead, make the exhaust free flowing, get gauges, a valve body, and custom tune it. You can't stack anything

I made my Samsung SGH-I997 send this.
:agree:

If you want that truck to last, stop modding it and start reading up on it before you continue.

K&N will kill the truck and you can't stack chips. Start with the basics, a intake that actually filters out dirt, exhaust, gauges and a chip from DP, TW, PHP, etc.
:agree:

Read read read! So much information on this site it's crazy. K&N is garbage! you know mangaflow from gas engines? If you are doing a straight pipe, there are a lot of options, many cheaper then mangaflow.
DIY air intake, straight exhaust(cool lookin' tip), high pressure oil crossover, and tunes. I love my php tunes. Also I have the fuel rail crossover didn't notice much but I'm sure it's helping. Edit: also gauges for sure.
Why will a K&N cold air intake ruin my truck?
What does a DIY intake do that's better?

For guages, Banks for turbo boost, trans, what else?

What brand of high pressure oil and fuel crossover lines do you guys recommend?

A four or five inch exhaust? What brand?

You guys know so much, thanks for all the help, much appreciated!
the 6337intake is really popular. You can find it on riff raff if you want a kit. They also have the high pressure oil crossover and a regulated return system for the fuel. Thats what im getting.

Auto meter, and ISSPRO are pretty popular. Glow shift arnt bad if your on a budget as far as gauges go.

MBRP makes a pretty inexpensive exhaust. Thats what i have and i dont mind it, dont have any expirence with any of the other ones though. Sizing is up to you 4inch should be plenty, 5 will get you more sound.

Alot of people have reported their K&N's letting dust through and "dusting" their engines. There are a bunch of threads on here, google "powerstroke.org k&N intake" and you will read more then you ever want to about it.

I have a k&N on here, came with the truck, no idea how long its been on there. Pulled the intake off and had no signs of damage to the turbo or residual dust on the inside of the intake. Most hate the k&n, some like it and swear by it. Personally im switching to the riff raff kit and using the k&N tube , why even risk it.. The kit is like 60 bucks or something like that.
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Why will a K&N cold air intake ruin my truck?
What does a DIY intake do that's better?

For guages, Banks for turbo boost, trans, what else?

What brand of high pressure oil and fuel crossover lines do you guys recommend?

A four or five inch exhaust? What brand?

You guys know so much, thanks for all the help, much appreciated!
Pyrometers are very useful, and help prevent you from working you truck too hard.
Why will a K&N cold air intake ruin my truck?
What does a DIY intake do that's better?

For guages, Banks for turbo boost, trans, what else?

What brand of high pressure oil and fuel crossover lines do you guys recommend?

A four or five inch exhaust? What brand?

You guys know so much, thanks for all the help, much appreciated!
Possibly.
Read man. Filters better, flows better.

Banks? Made of money?
Autometer z series for me. Boost, trans, egt.

I'd only get a solid HPx line. Strictly Diesel.
RiffRaff makes the FRx.

I made my Samsung SGH-I997 send this.
Nah, I ain't made of money dudes!

What does a valve body thing a ma bob do to my 7.3?

Once again, thanks a mil!
any brand names for pyrometers?
peace!
Auto meter z series again.
A valve body controls shifting speed, basically. An upgraded VB firms/quickens shifts, helping to hold that extra power with less heat.

I made my Samsung SGH-I997 send this.
bts valve body off beans is 250 bucks with a 250 core charge if you dont send yours in first
Like said, get a better intake. Ford AIS or the AFE Pro Guard 7 are best IMHO. Then a set of gauges are in order.
The K&N has a bad reputation with the 7.3L engine. The main reason for this is because that is the filter most people have in the stock air box. Where the main problem lies is the design of the stock air box. One of the clips is known to break which lets unfiltered air through. This is what actually causes the engine to get dusted. I have not heard of the K&N CAI(Cold Air Intake) dusting engines but I personally think they are too over priced.

The air filter setup that most people opt to go with is called the "6637" intake. It is basically a piece of 4" pipe connected to the stock rubber intake tube, attached to an air filter with the part number of 6637. It is relatively inexpensive, easy to make, filters better than the stock setup, and achieves better airflow.

There are other aftermarket options such as AFE, Airaid, and S&B too. These all work better than the stock setup too, but will cost you more than the 6637.

As for exhaust, anything bigger than stock will work good. There are a few manufacturers that sell complete systems that you can choose from. They all work quite well.

When it comes to tuning... First of all, you cannot "stack" chips on a 7.3, and even if you could there is no need to. You can achieve all of your tuning needs with one chip. Custom tuning is the only way to go with any diesel. Custom tunes will get you more power, better shifting, and sometimes even better fuel mileage. The fuel mileage gains usually depend on your driving habits though.

You also need a way to monitor the vitals of your engine. Exhaust temperature and transmission temperature are the two most important to most people. Boost is usually the third option, but it is no where near as important and exhaust and transmission temperature. You can also monitor a ton of other things going on with the engine if you really want to.

These are just the basics... Remember though, when you start adding power you need to prepare the rest of your truck too. A good transmission is a must when it comes to longevity. With just exhaust, intake, and a custom chip you probably wont have to worry about your transmission for a while if you drive like a sane person.

If you need anymore help or info feel free to contact me or post up in the forums. People are always here to help.
See less See more
Why will a K&N cold air intake ruin my truck?
What does a DIY intake do that's better?

For guages, Banks for turbo boost, trans, what else?

What brand of high pressure oil and fuel crossover lines do you guys recommend?

A four or five inch exhaust? What brand?

You guys know so much, thanks for all the help, much appreciated!
Check out this write-up: http://www.powerstroke.org/forum/99-03-7-3l-general-discussion/267128-truth-about-k-n-intakes.html

It's non-biased and would be informative to your situation since you just bought your CAI. You "should" consider switching over to another filter (I use the K&N tube with a 6637 attached at the end. Fits perfectly). You can keep the K&N setup, but lose the filter. It's not a total loss.

Here's a link to show my setup: http://www.powerstroke.org/forum/at...discussion/43505d1348713970-foil-delete-2.jpg

K&N pipe/6637 filter. Everything fits together perfectly.
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