Duramax Diesels Forum Truck of the Week
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Old 07-19-2017, 02:54 PM
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Default LML 100 over injectors driveability?

Need a bit of advice... Engine's coming out for a cracked head shortly. I've got a 475/stock kit laying in the garage that will likely be going on while the engines out. The truck is primarily used for towing, but getting turned into a racetruck as soon as I get something else to replace it. 280k on it... Once I'm finished towing with the truck, I'll be switching out the whole 475/stock for something larger. What kind of towability/driveability will I see with the larger injectors right now. The truck is Sportsman cp3 swapped...


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Old 07-19-2017, 03:36 PM
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You will need a better pump than that to start with. Personally I wouldn't do that in a daily driver LML. That's just my opinion. It already has plenty of fuel available for a daily driver.


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Old 07-19-2017, 03:45 PM
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Thanks for your thots... Injectors are getting close to being out of spec. They'll probably be alright for a bit yet, but will need new ones soon. My thot was to buy what I'll need in the future instead of buying twice, but I might end up running these till I have to do something with them.

10mm-12mm for 100 overs, or dual pumps with another sporstman, for future reference?

The truck won't be a daily driver much longer, middle of next year at the latest. Are you against larger injectors from a driveability standpoint, or just not needing them? What will I see with them in a daily driver?
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Old 07-20-2017, 03:32 AM
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How will towing affect larger injectors in the long run?
How much will larger injectors at a lower pulse width lower EGTs?


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Old 07-20-2017, 03:37 AM
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What's your end power goal?

From what I remember, the LML injectors are already a decent size. Maybe look into 40% overs.

I don't have an answer for the towing aspect, but I doubt you'd see significant drops in EGT.
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Old 07-20-2017, 03:50 AM
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I have a stealth 64 lml turbo that would work great for you with that compound kit
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Old 07-20-2017, 04:07 AM
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Default LML 100 over injectors driveability?

Once I'm finished towing with it, the twin setup will be replaced with something totally different, so I'm really not looking to do anything major turbo-wise other than just throwing the twin kit on to lower EGTs...

My goal is to break 1k hp... The truck will no longer be a daily driver, just a weekend/racer/fun truck...

I'll either be going with 100s right away, or than running my stock injectors till I have to have new ones. They might hang in there for awhile yet if I run some cleaner thru them... From what I know, 700-750 is possible with stock injectors, and enough air/fuel... That's pushing them to the limit, and I doubt mine would healthy enough to do that. Not that I'd be running them that hard while towing...

Where does less pulsewidth using larger injectors come into play if not for less heat?


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Old 07-20-2017, 06:10 AM
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Usually less timing / cyl pressure also.

I agree that it should drop peak EGT, but how often does your truck run WOT? And at a moderate power level that is safe to tow at, your pulse isn't going to be stretched out extremely far compared to a max effort tune on stock injectors.
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Old 07-20-2017, 06:23 AM
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Makes sense... I'll probably end up running the stock injectors till I need something bigger, if they hang in there for a bit yet...
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Old 07-20-2017, 06:27 AM
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Like you said, on a tow safe tune, I don't see a lot of WOT... The engine usually has a pretty good load on it, tho, with the amount of wind I catch...
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Old 07-20-2017, 09:37 AM
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As far as total hp I'm not sure what their ceiling is. On 1500 us I made 737 with a stock charger and a little spray. You can turn them up plenty more than that.


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Old 07-20-2017, 09:47 AM
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What pump are you running?

I'll be sticking to fuel only..
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Old 07-20-2017, 10:12 AM
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A sportsman pump.


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Old 07-20-2017, 10:14 AM
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I could see 800 easily on stock injectors and the right turbo selection. I believe I could have broken 900 with spray and a stock charger.


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Old 07-20-2017, 11:35 AM
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So when I do switch to a 12mm pump and larger injectors, what will I see? Obviously some smoke at idle, the smell, loss of fuel economy (who cares at this point)... Will it be harder to get fingers pistons running clean? I'm on Tony's tunes, and he's got them running very clean right now...
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