Cooler EGTs With Larger Nozzles? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 5 (permalink) Old 02-19-2009, 09:51 PM Thread Starter
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Cooler EGTs With Larger Nozzles?

I developed some tow tunes for a member here (BlackPearl03) last weekend and I noticed that the power level on the tow tune was more than the stock injectors on full tilt but the EGTs didn't break 1000 degrees unloaded and the stockers could easily bury the pyro at the same power level. The injectors were 238cc Hybrids with 80% EDM nozzles.

I had never thought about it before but it makes sense because the injectors can get the fuel in there sooner at WOT and hit the "sweet spot" without burning fuel late and raising the EGTs. Anyone else experience this with bigger nozzles or any injector combo for that matter?
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post #2 of 5 (permalink) Old 02-19-2009, 10:05 PM Thread Starter
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Re: Cooler EGTs With Larger Nozzles?

Compounds would take care of this too but the TN BB turbo leaves some things to be desired and the low EGT was a nice suprise....
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post #3 of 5 (permalink) Old 02-19-2009, 10:07 PM
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Re: Cooler EGTs With Larger Nozzles?

Make's perfect sense. Just keep in mind, when injecting a small quantity of fuel with a large nozzle you have to be on your game much, much more so than with a smaller nozzle that "softens" the burn rate, and spreads it out (if the injection duration is held long). With the right sized nozzle, timing and ICP will need to be reduced or things will get too "crispy".

You can actually damage an engine by doing nothing but removing fuel. Lott's "lean out" is NOT crazy. I've done it about 6 times. Things can and do get VERY violent if fuel is pulled in certain situations and no other changes are made.

Reducing my engine's torque output sub 3000rpm has been a serious chore because of this. Pull fuel... and it tries to tear itself apart. Makes it kind of hard to back the power down now doesn't it?

To say this has frustrated me would be an understatement.

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post #4 of 5 (permalink) Old 02-19-2009, 10:09 PM
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Re: Cooler EGTs With Larger Nozzles?

In theory, ya, but I can't tell you from experience :)

Dan
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post #5 of 5 (permalink) Old 02-19-2009, 10:16 PM Thread Starter
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Re: Cooler EGTs With Larger Nozzles?

Quote:
Originally Posted by Charles View Post
Make's perfect sense. Just keep in mind, when injecting a small quantity of fuel with a large nozzle you have to be on your game much, much more so than with a smaller nozzle that "softens" the burn rate, and spreads it out (if the injection duration is held long). With the right sized nozzle, timing and ICP will need to be reduced or things will get too "crispy".

You can actually damage an engine by doing nothing but removing fuel. Lott's "lean out" is NOT crazy. I've done it about 6 times. Things can and do get VERY violent if fuel is pulled in certain situations and no other changes are made.

Reducing my engine's torque output sub 3000rpm has been a serious chore because of this. Pull fuel... and it tries to tear itself apart. Makes it kind of hard to back the power down now doesn't it?

To say this has frustrated me would be an understatement.

Instaboost has it's drawbacks I guess... Aren't your injection rates fairly fast as well? It's pretty cool when the injectors actually respond to ICP changes at elevated power levels isn't it?

Yep I guess Lott did prove you can run something lean enough when you have lots of oxygen and very little fuel. Just ask Snow White's center 4 cylinders....
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