200% nozzle = great tow pig

SDstroker · Nov 18, 2011

Gearhead said:
Ive seen some 100% nozzles that are way worse on a cold start than that.

Are you picking on me? :doh:
http://s1204.photobucket.com/albums/bb414/opieg01/?action=view&current=2011-10-21_07-43-27_887-2.mp4

Cat_rebel · Nov 18, 2011

woodduck97 said:
Cat does your truck buck going down the road?

Can you define "buck"? Like on acceleration/cruising/coasting?

woodduck97 · Nov 21, 2011

It is under cruising situations. I think it maybe something in the injectors cause they sound a little funky when the truck is cold compared to others trucks I have heard.

Cat_rebel · Nov 21, 2011

Mine has a weird "buck" if I hold it around 35mph with the TC locked in 3rd gear. Almost feels like it surges but when you roll into it a little it's fine. Just weird, might be my tranny giving me the bird.

Gearhead · Nov 22, 2011

Cat_rebel said:
Mine has a weird "buck" if I hold it around 35mph with the TC locked in 3rd gear. Almost feels like it surges but when you roll into it a little it's fine. Just weird, might be my tranny giving me the bird.

no it is the truck alternating between 4-6 cylinders instead of all 8 because it doesn't need all of them firing to maintain speed a low loads.

woodduck97 · Nov 22, 2011

Gearhead said:
no it is the truck alternating between 4-6 cylinders instead of all 8 because it doesn't need all of them firing to maintain speed a low loads.

I know you have told me this before Matt but my buddy who has 250/200's his barely does it. We tried all rpms on his and couldn't get it to do it like mine.

Gearhead · Nov 22, 2011

woodduck97 said:
I know you have told me this before Matt but my buddy who has 250/200's his barely does it. We tried all rpms on his and couldn't get it to do it like mine.

the faster the injector flows, the more it will do it. So fuel side mods and other things that make the injectors better at WOT will make them overdeliver fuel at light throttle and thus shut off injectors randomly. You can get around this by dropping ICP but then you get haze all the time rolling down the road.

Charles · Nov 22, 2011

If your truck is "bucking" when cruising at extra light load, then you simply need to drop a couple hundred pounds of ICP or lower the MFD at the very start of pedal travel.

It is 100% a tuning refinement issue. Each truck responds just a hair different. But it is not inherent to a 200% nozzle. It's 99.99% of the time simply too much ICP at low pedal. Many people have ICP tables that call for upward of 1100psi as rpm climbs to ~1500 or so even when you're barely touching the pedal.... or not even touching it at all...

Wrong...

It needs to be ~5 to maaaaybe 700 or so when you're light on the pedal.... no MATTER what the rpm is...

And that little "quirk" will just magically never happen again. Unless of course the first cell for MFD is too high... then the second you touch the pedal each time it will jerk a little. Also a simple correction.

Each truck is different. Hell, each IDM I've run has been different in this area. If one is a bit stronger it will require less initial pw at minimum TPS than another, all else constant. Basically, my point is.... don't hang your tuner. Just get it fixed if it bothers you, because there's zero reason to have it if you don't like it. A 200% nozzle in no way dictates that the truck will behave "twitchy" or "jerky" if you will. Unless you tune it that way of course. It can be soft and spongy if you want. Wayyyy milder than stock. It's all in what you want. Simple keystrokes dictate all of this. Same for the 400% nozzles and all others. There's simply no way the nozzle can make the truck buck around unless the tuning dictates that it should.

Gearhead · Nov 22, 2011

It is a delecate balance of exhaust haze and "twitch" when it comes low load fuel delivery. Some people can't stand to cruise down the road with the truck hazing. and it does if you drop the ICP enough to make a difference on an OBS truck with 4:10 gears and very little weight compared to a heavier truck.

Derek@Vision Diesel · Nov 22, 2011

My truck had the bucking when i got these fuel side modded hybrids, i mean it got pretty bad in my old tunes going down the freeway.

Tony sent me some stuff that took care of it, no haze at cruise and no bucking. Truck runs great!

woodduck97 · Nov 22, 2011

The buck is not that bad all the time but can get annoying.

Tree Trimmer · Nov 22, 2011

so, to all you guys that have those 200% nozzles. do any of you plow snow with them? can you plow snow with them? is my last hang up on nozzle size.

onebad7.3 · Nov 22, 2011

Tree Trimmer said:
so, to all you guys that have those 200% nozzles. do any of you plow snow with them? can you plow snow with them? is my last hang up on nozzle size.

I have 200% nozzles and this will be my first year plowing with them. I don't for see plowing snow with 200% nozzles being a problem

Cat_rebel · Nov 22, 2011

Still running the stock IDM, I'm interested to see how it would act with a modded one.

Powerstroke Cowboy · Nov 22, 2011

Cat_rebel said:
Still running the stock IDM, I'm interested to see how it would act with a modded one.

Are you anywhere close to a dyno for before and after tests???

Charles · Nov 23, 2011

I think I might write a horrendously sh*tty program that calls for buttloads too much pw and way too little ICP and then flash it to a truck with stock nozzles.

Then I'll rave on and on about how HORRIBLE stock nozzles are for towing or smoke control, cold weather and everything else. How they just smoke alllllllll the time and run hot allllllll the time. I'll run the idle ICP way too high so it sits and shakes and romps at idle too. I'll make the initial pw and ICP when you touch the pedal way to high so it jerks and bucks driving down the road as well. I'll post videos of it smoking like a train trying to tow down the road while overheating and burning up all the fuel in the world.

Why? Just to make it that much more obvious that the tuning decides nearly everything being discussed in this thread.

Cat_rebel · Nov 23, 2011

Powerstroke Cowboy said:
Are you anywhere close to a dyno for before and after tests???

Not this time of year, I passed on a few this summer due to not being finished yet. I should have just paid my damn $50 to a local dyno that was proven to be fairly spot on. But without my turbo/tranny upgrades I really can't beat on it too bad as it sits. Like the old mud bogger saying goes......"This is my daily driver, if I break it I'm ____"
But I would have no problem dynoing with a stock OBS IDM & a modded IDM if the chance presented itself.

Charles said:
I think I might write a horrendously sh*tty program that calls for buttloads too much pw and way too little ICP and then flash it to a truck with stock nozzles.

Then I'll rave on and on about how HORRIBLE stock nozzles are for towing or smoke control, cold weather and everything else. How they just smoke alllllllll the time and run hot allllllll the time. I'll run the idle ICP way too high so it sits and shakes and romps at idle too. I'll make the initial pw and ICP when you touch the pedal way to high so it jerks and bucks driving down the road as well. I'll post videos of it smoking like a train trying to tow down the road while overheating and burning up all the fuel in the world.

Why? Just to make it that much more obvious that the tuning decides nearly everything being discussed in this thread.

I always love reading your posts Charles. :thumbup:

TyCorr · Nov 23, 2011

Charles said:
I think I might write a horrendously sh*tty program that calls for buttloads too much pw and way too little ICP and then flash it to a truck with stock nozzles.

Then I'll rave on and on about how HORRIBLE stock nozzles are for towing or smoke control, cold weather and everything else. How they just smoke alllllllll the time and run hot allllllll the time. I'll run the idle ICP way too high so it sits and shakes and romps at idle too. I'll make the initial pw and ICP when you touch the pedal way to high so it jerks and bucks driving down the road as well. I'll post videos of it smoking like a train trying to tow down the road while overheating and burning up all the fuel in the world.

Why? Just to make it that much more obvious that the tuning decides nearly everything being discussed in this thread.

I was waiting for this...

I appreciate your enthusiasm and wish you'd entertain the idea of doing some tuning. Seems like you could get people that want the bigger nozzles sans the perceived 'problems' with them on board to run 200%ers. Just a thought.

Curtis@Vision Diesel · Nov 25, 2011

I have 375/200 that will easily make 650 with a single and stock heads.... Tuning is a key, but even without great tuning my truck is totally daily driveable

Derek@Vision Diesel · Nov 26, 2011

97pwrstroke said:
I have 375/200 that will easily make 650 with a single and stock heads.... Tuning is a key, but even without great tuning my truck is totally daily driveable

^^ Forgot to sign out of Curtis' account when i posted that