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4D55 Performance Inc.

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About 4D55 Performance Inc.

  • Rank
    ITD Member

Personal Information

  • Occupation:
    I am working on a Doctorate at Utah State University
  • Biography:
    I was born and raised in Mapleton Utah but I have lived in Cache Valley for the last 9 years.
  1. Looking for info. I have a 1984 D-50 4x4 with a 4D55T, that my Dad left me when he passed away. I love the truck but need to rebuild the turbo. According to the numbers it is a TC05, but has an internal wastegate, so I'm assuming it must be a TD04. Any ideas?

  2. 4D55 Performance Inc.


    Truck looks great. I just moved my battery and I went with the 0 aug. I think you still have enough room under the hood for a battery, if you go with a Stinger battery like I did. They are the best battery money can buy. Mine is an SP1000 and it is way smaller than an Optima. You should look into going with a Stinger.
  3. 4D55 Performance Inc.

    4D55 Dyno Results

    So, Can you guys handle the Truth? On my to and from Pocatello last night I averaged 34.8 mpg according to my gps and I was not even trying to save fuel. I was just driving normal and trying not to hit deer. I took a drive to Salt Lake today and had a good mix of city and freeway driving and averaged 31.6 mpg. I don't know what Terry did to my injection pump but it is running great and the milage is killer.
  4. 4D55 Performance Inc.

    4D55 Dyno Results

    So here is the first of many dyno runs I hope to make over the next few years. The HP and TQ number you see are rear wheel numbers. I am going to drive it around with these settings for a while and monitor boost, EGT's and MPG's. As you can see Terry did an amazing job getting this truck to the factory specs. This gives me a great starting point and now I will be able to track the improvement that each mod makes. I have adjusted the rear wheel numbers into flywheel numbers for comparison. The owner estimated I was losing the normal 20%. Factory Specs: 80 hp @ 4200 RPM's 125 ft-lbs torque @ 2500 RPM's Adjusted Specs: 80 hp @ 4002 RPM's 127 ft-lbs @ 2958 RPM's
  5. Justin, it's Spence, but I have to give you credit, you did remember Boston the "Ice Man". Thanks, we had a great time and we made it back safe. We look forward to meeting up with you guys in the future as well.
  6. Hey is this meeting at the Green T restaurant on Yellowstone ave in Chubbok?
  7. Oh I should be there, that's a Thursday night, right?
  8. Well that seals it, I am not coming, Justin's gonna be there.
  9. I'll have to check the ole calendar. I am looking for almost any excuse to eat steak these days.
  10. 4D55 Performance Inc.

    New Guy with a Cummins

    As far as the K&N goes, it depends on the style, I run a K&N air filter and I have never had any issues.
  11. 4D55 Performance Inc.

    New Guy with a Cummins

    Anything is possible with an understanding wife. Otherwise your screwed. Welcome, I am Spence:wave:
  12. 4D55 Performance Inc.

    Propane Injection

    Well, I will start with modifying the fuel pump and adding an intercooler. If that is not enough power then I will add propane. Man these IDI's are tougher to modify.
  13. 4D55 Performance Inc.

    Propane Injection

    So seeing how my truck is a turbocharged IDI, would I be better off to go with propane or with a water/meth setup. I don't really want to increase boost pressure to much cause compression is 21:1 and I already push 15psi. I would mind pushing 18-20 psi, but thats the limit I feel comfortable with.
  14. 4D55 Performance Inc.

    Propane Injection

    I think you worry to much Muddy. I am just looking to get a more complete burn of my fuel so that I can get a few more MPG. If I gain 10hp, that would make me plenty happy. My truck has IDI and makes around 120hp so I think these are realistic expectations. Here is a link to the kit I am thinking of: http://cgi.ebay.com/ebaymotors/Propane-Injection-System-for-all-Turbo-Diesels_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem260345354360QQitemZ260345354360QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories It seems like a good alternative to spending $850 on the Bully Dog system. So it says that propane injection does really increase EGT's but does propane increase boost pressure?
  15. 4D55 Performance Inc.

    Propane Injection

    What do you mean, "before I came to my senses"? Also what is needed to make my own and how much would it cost? Thanks