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1998 4bt Cummins Swap

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  #261  
Old 01-12-2013, 01:02 PM
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Moo do you have EGT and boost gauges hooked up? Before you start turning screws it's recommended that you do both. I don't know what a 4bt head gasket is good for boost wise, but you wanna be able to keep an eye on things for that reason and because you don't wanna run hot...



Just remembered you are familiar with the diesel side of things, since you already have another, I wasn't trying to condescend in the slightest.
 
  #262  
Old 01-12-2013, 06:36 PM
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No problem, I have a pyro and the 4bt gasket is not likely to pop with a single turbo let alone the stocker...

Since I fixed the boost leak its been hard to break 1000f. I am running 7-900 on the highway with enough to power to pass grandpa at the speed limit
 
  #263  
Old 01-12-2013, 07:46 PM
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Nice. If you are talking about the h1c, there is more power there than you might think. what size is your exhaust housing?
 
  #264  
Old 01-12-2013, 10:34 PM
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There are several different h1c's...
Wh1c, big h1c, small h1c, and the baby h1c

I have the baby- which either have a 46 or 50mm compressor wheels. Right now I'm running a big (16-18?)ex housing but will be switching to a 12cm ex housing for the quicker spooling.

I have been taking 6bt gains and multiplying by 2/3 in my power goals...
 
  #265  
Old 01-12-2013, 10:43 PM
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12mm will make a big difference I bet. Didn't realize your comp wheel was so much smaller. I still think you should be able to reach your goals with those mods. You considering a fuel pin replacement yet? Or still just turning it?
 
  #266  
Old 01-13-2013, 12:59 PM
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When I was looking for a 12cm ex housing I found another freshly rebuilt baby h1c with the housing already on it for cheap ($150)... I have been pretty sick and dont feel like freezing my *** off on the garage floor swapping them lol. Ill toss on some pics cuz thats what I do....

And I guess I will have to see if I want more after I spin the pin. As of right now I like the idea of "free" upgrades
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  #267  
Old 01-14-2013, 12:44 PM
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Subbed to YT Channel
 
  #268  
Old 01-19-2013, 06:51 PM
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Finally got around to attempt the gutting of my filler. After a couple cuss words it came right out
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I was too anxious to burn a whole tank to see what ballpark mpgs were going to look like lol. so its a little inaccurate but I will stay disciplined for the next fill haha

FIRST FILL: 73 miles/3.2gal= 22.8 mpg. It was a city/interstate mix with about 20-30min total idle time, but still pretty happy

Efficiency items on the list:
-Add I/C
-Bump timing 1/8"
-Get a new air filter (reused the old one)
-better thermostat, 4bt and 47rh both running too cold
-16cm-->12cm ex housing on turbo for spool

Looking to pull 25-28 mpg @ 60mph in the end.
 
  #269  
Old 03-03-2013, 09:34 PM
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Closing in on 4,000 miles on the swap. Minor updates for anyone that does the swap

Turns out the timing has been bumped the entire time lol. So I won't be getting much better efficiency from here on. I have the new turbo and '97 intercooler ready, I am just gathering up my plumbing a couple pieces at a time. I have a 366 spring in the mail too, so when it gets here I will hopefully be able to put it in along with the intake goodies.
Picking up a new tstat and bhaf tomorrow from napa... Still havent installed a fan, we'll see when the summer temps come around if Ill even install it at all.
I traded my Ford 1g alternator for a 3g (upgrade in amperage and reliability)
-grabbed one from a junkyard for cheap, took it apart and cleaned it up and added new brushes for $8... It was a direct drop in for the bracket. I will be flipping it upside down and making room for my AC compressor. I will likely be mounting my AC like this
 
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  #270  
Old 03-04-2013, 08:30 AM
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so have you ever checked the gas mileage?
 


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