is there a way to get the rattling to go down cause my truck rattles alot an it annoys me to no end or is that something you ahve to live with when you get bigger nozzles
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Question: tuning 45% overs
- Thread starter DIESELMAFIAPER.LB7
- Start date
You need to adjust the timing tables for them.
Do a log. Make sure to log Throttle position, Main rate, Main injection timing, rpm, and rail pressure.
When logging if it rattles let off very quickly. When you open the log look for the drastic dip in throttle position. Right before that is where it rattled. Use the RPM and MM3 to go to you timing table and cross the two to find the blocks that need the timing backed off.
Do a log. Make sure to log Throttle position, Main rate, Main injection timing, rpm, and rail pressure.
When logging if it rattles let off very quickly. When you open the log look for the drastic dip in throttle position. Right before that is where it rattled. Use the RPM and MM3 to go to you timing table and cross the two to find the blocks that need the timing backed off.
k well i also know now that i have a couple of bad injectors to so an it rattled with stock timing i dunno we'll log it when i get new injectors if i dont sell the piece of shit first starting to like my cummins work truck more and more
X2 , also stock timing isnt nec going to work now , your truck isnt stock
Usually its the pilot timing that causes rattles with bigger sticks but regular timing can cause it too , some injectors are easier to tune than others so keep at it you will get it if you log it and adjust from there .
GMC_2002_Dmax
The Still Master
we pulled the pilot injection back alot if i remember right and remapped the main injection tables and the timing tables but it did rattled less before the tuning started an i just had a stock timing and a 1800 pw but like i said smokes white at idle when in gear didnt before tuning so i dont know if its the tuning (which i highly doubt) or bad injectors which its a lb7 so...:cussing: :banghead: going to check balance rates again tomorrow to see whats up i guess
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Just buy a Moates Road Runner and be done with it.
an ya wish i could get one
Everyone think Its just the luck of the draw on the injectors? Just don't make sense for them to go out like that
Just buy a Moates Road Runner and be done with it.
You must own the only working on the face of the earth Tony.
They are nothing but trouble.:banghead:
Sounds to me timing is now too late and you may need to up the idle fuel pressure. If you lowered the pilot timing without also decreasing the time after pilot for main injection, could be an issue as well.
I was thinking Simon has one and had really good luck with it. Guess I don't remember very well.
I not sure he ever got one. The ones I messed with where nothing but hassle. Ask Smokeshow how much fun they are. If you get one that works they would be slick. But when the dont it is amazingly frustrating.
GMC_2002_Dmax
The Still Master
A Road Runner is a bit quirky until you figure out what you need to do to make it work in various vehicles.
Mine works fine, it will set an occasional security light and hiccup every so often but it works and works well.
DieselMafia,
The rattle is most likely caused by fuel pressure at part throttle not timing.................try reducing fuel pressure 5-10 mpa in the area of the tune where it is rattling.
Remember time/pressure/orifice is key.
You have a larger orifice so depending on pressure you get more or less fuel delivered as well as pulse width.
You will need to increase pilot timing and main injection timing to compensate and probably lower fuel pressure.
Also increase pilot pulse width and main injection pulse width at idle.
White or blue smoke is incomplete combustion, you need "more" fuel to complete the burn and more timing.
Mine works fine, it will set an occasional security light and hiccup every so often but it works and works well.
DieselMafia,
The rattle is most likely caused by fuel pressure at part throttle not timing........
.........try reducing fuel pressure 5-10 mpa in the area of the tune where it is rattling.Remember time/pressure/orifice is key.
You have a larger orifice so depending on pressure you get more or less fuel delivered as well as pulse width.
You will need to increase pilot timing and main injection timing to compensate and probably lower fuel pressure.
Also increase pilot pulse width and main injection pulse width at idle.
White or blue smoke is incomplete combustion, you need "more" fuel to complete the burn and more timing.
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Could white smoke be from way to much fuel just like when injectors go bad? I'm not saying they are just an example. To much fuel could cause a knock too.
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k thanks guys i'll try that but why would it not do it instanly afte tuning it took a couple days to start smoking at idle
A Road Runner is a bit quirky until you figure out what you need to do to make it work in various vehicles.
Mine works fine, it will set an occasional security light and hiccup every so often but it works and works well.
DieselMafia,
The rattle is most likely caused by fuel pressure at part throttle not timing........
Remember time/pressure/orifice is key.
You have a larger orifice so depending on pressure you get more or less fuel delivered as well as pulse width.
You will need to increase pilot timing and main injection timing to compensate and probably lower fuel pressure.
Also increase pilot pulse width and main injection pulse width at idle.
White or blue smoke is incomplete combustion, you need "more" fuel to complete the burn and more timing.
I'm thinking too little heat is the problem, White smoke. Plenty of fuel already indicated by the white smoke. I do also believe timing too low.
I've watched similar rattle with a cylinder pressure monitor and have clearly seen cylinder pressure have two peaks one close top dead center and one just slightly after top dead center. The sudden dip between the peaks must have been rejection to the fuel, don't know for sure though. I came to the conclusion the peaks must be due to part of the fuel flashing with the rest too cool to flash until slightly later then a flash again. Never a complete burn as the peak pressure was never more than just slightly over adiabatic with no flash at all.
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I see. I didn't realize Mitch had played with one. I always wanted to get one but never did. What was the hassles with the roadrunner for you?
Anyone have an idea.o were I should be sitting for 45% timing? I know Trent ran some anyone else been running any there extrude hone I think Trent's Were Georges iirc.
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it just never ran the same with the same tune in the roadrunner or in a reg. ecm. It was that way for more than one truck with this particular roadrunner. It was a pita to get it to talk, then make the change you meant to make, then actually do what you thought it should. It was promptly removed in favor of a reg. ecm. We'll deal with full flashes & trial & error on a dyno or track when needing to make changes. :thumb:
Glad to hear it's worked for at least a couple of people. I'll stick to what is more widely known to work.
As to the OP concerns. No idea.
Glad to hear it's worked for at least a couple of people. I'll stick to what is more widely known to work.
As to the OP concerns. No idea.