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Old 03-14-2018, 07:37 PM
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Default Need a little info on injectors tip sizes

Looking at putting in 238/80's into my truck. Why would a person choose the tip size from one to the other. Lets say from a 30 to a 80 or a 100 in this size of injector. Pulling a horse trailer with a 6spd and 4:11 gears with 235/85-16 tires. I have done all the mods up to just doing the injectors left. In Iowa we are pretty flat and only run 55 on our county blacktops. But when we travel we go thru South Dakota and Wyoming and the speed limit is 80. What I am looking for is what is the thought process of why one size fits in a usage better than another size. I understand that the smaller size helps with lower rpm's but where does it start to fall on its face in higher rpm's. My thought is at higher rpm's that the injector can't keep up with trying to empty and your just pushing fuel in too late in the power stroke and not getting full fuel efficiency. Also if you are running a 175/80 single shot with the 7 to 1 ratio vs 238/80 with 5 to 1 how much quicker will the 7 to 1 be able to empty the injector. Will the 238 have to run 100 tip to be the same. Just looking for some guidance before I order my injectors. This is just a tow rig that lives on the trailer. I have full 4" turbo back, New 38r, new Adrenalin. Heat rapped up pipes. New fuel system. 8 gauges. After having a new diesel just want this one to run like the new one. It only has 130,000 miles on it and I bought it brand new. 02CCLB 4x6 6spd. It is never leaving so just want to have fun with it.
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Old 03-14-2018, 10:20 PM
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The best towing injectors are 205/30’s, they’re the smallest hybrids, use the least high pressure oil, and make 20hp less then 238/80’s. If you run 205/30’s with a 38r and a good tow tune you’ll be able to keep your foot into it with no smoke and low EGT’s.

If you woukd rather have more power and don’t mind a little smoke the 80 and 100 nozzles are totally doable.
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Old 03-15-2018, 06:16 AM
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Explain what and the why of the 80 or 100 nozzle does for you over the 30 over nozzle in the same size injector. Is it just in which rpm band that each one has the advantage.
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Old 03-15-2018, 07:16 AM
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should allow you to put more fuel in the cylinder at the best timing point.

30 will take more time to get the same amount of fuel in. the discussion would be is the longer shot time better or worser

run what your tuner recommends and likes to tune
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Old 03-15-2018, 02:31 PM
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Okay. Then would in a towing situation running 2,400 to 2,700 rpm's would the 30% or the 100% be better. Or in another words is the 30% going to give you more torque at that rpm's because of the longer injection timing.
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Old 03-15-2018, 08:21 PM
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The higher the average operating speed, smaller the injection window is. This is where the larger nozzles shine. They are able to inject larger amounts of fuel in the time window in which cylinder temps/pressures are optimal for the most complete combustion. High PW usually mean high smoke output and inefficient use of a given amount of fuel. It is a compression ignition motor, so combustion is coupled to pressure/temperature in the cylinder. If I find something that visually explains this better than my inadequate written comment, I will post it up.
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Old 03-16-2018, 12:13 AM
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The larger the nozzle the more critical the tuning. 200cc hybrids seem to be a popular choice for towing and hauling.
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Last edited by superpsd; 03-16-2018 at 12:23 AM.
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Old 03-16-2018, 05:41 AM
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This thread might help you. http://powerstrokearmy.com/forums/sh...arge+injectors
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Old 03-16-2018, 05:55 PM
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is a 200cc hybrid cheaper then a 238? if not then there is no point to it
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Quote:
Originally Posted by Chvyrkr
BTS transmissions have the absolute top of the line hard parts and clutches, in every single one.....every once in a while that somebody like Mike O or Charles gets a different piece, because they've broken his normal piece.
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Old 03-17-2018, 06:28 AM
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Quote:
Originally Posted by m j View Post
is a 200cc hybrid cheaper then a 238? if not then there is no point to it
$300 difference on Swamps site.

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