need help on making better lower end response.

[Scarface]

I need help on making low end more responsive from take off. mid and top end is good but truck at wot is smokey.

[potthoff]

best thing I found so far is main injection pulse but im fairly new to the whole deal. I have found small adjustments are the best way due to loppy idle and a weird deceleration when letting off throttle in neutral.... I have been wanting more information in this area also. hopefully someone will have more input soon.

[Scarface]

I am hoping to. going between duramax trucks and dodges then with how customers want to run bigger injectors and but drive them daily.

[BigCE]

More low end timing will help but too much and the turbo will spool slower its kind of a balancing act.

[Scarface]

ok I do have the tune I can show if need be. I am figuring it out before I do a csp5 on this truck

[BigCE]

If you post it I can have a look when I have time and let you know what I think.

[Scarface]

18024 here is the tune

[BigCE]

Ok just at work I will look tonight.

[Scarface]

I am here at work as well. let me know what u think and what I need to possible change. the truck is running a nice setup. fass220, 180hp injectors, 85%cp3, head studs, built trans, silver bullet 66 turbo and 5 inch exhaust.

[tylerltr450]

I say add more pilot injection take out a little main duration. Seems like your bring your pilot injection in way late and its hitting super hard. Who knows I might be wrong but what do I know im new also.

Data log..... this will help us out.

[BigCE]

http://i114.photobucket.com/albums/n258/BigCE_photos/e9c14b7a6eb799a2e3e95a82b4ec4a06_zps4850a5f4.jpg (http://s114.photobucket.com/user/BigCE_photos/media/e9c14b7a6eb799a2e3e95a82b4ec4a06_zps4850a5f4.jpg.h tml)

I think you might want to look at your main injection timing. It is way too low in the lower end. IMO there is no reason for negative timing at all. I bet this truck is a smokey mess at low throttle and can definitely see why there is no low end power. I'm far from an expert so I'm not trying to be rude or anything this just stands out to me the most.

Also I would fix your throttle "position to desired fuel" F0505 and F0508 just make them linear across the board. For your injectors you might have too much pilot as well and I would advance the timing of the pilot about 2 degrees across the board.

I have attached one of my tunes I made for my buddys 06 5.9 its bone stock just as a comparison I think it can help you see what I'm getting at. Look at my timing calculator vs yours.

[tylerltr450]

http://i114.photobucket.com/albums/n258/BigCE_photos/e9c14b7a6eb799a2e3e95a82b4ec4a06_zps4850a5f4.jpg (http://s114.photobucket.com/user/BigCE_photos/media/e9c14b7a6eb799a2e3e95a82b4ec4a06_zps4850a5f4.jpg.h tml)

I think you might want to look at your main injection timing. It is way too low in the lower end. IMO there is no reason for negative timing at all. I bet this truck is a smokey mess at low throttle and can definitely see why there is no low end power. I'm far from an expert so I'm not trying to be rude or anything this just stands out to me the most.

why did you cut post injection and cut out pilot after 2400?? Just curious i seen this before and are you doing this to start the computer to use main timing instead?
Also I would fix your throttle "position to desired fuel" F0505 and F0508 just make them linear across the board. For your injectors you might have too much pilot as well and I would advance the timing of the pilot about 2 degrees across the board.

I have attached one of my tunes I made for my buddys 06 5.9 its bone stock just as a comparison I think it can help you see what I'm getting at. Look at my timing calculator vs yours.

why did you cut post injection and cut out pilot after 2400?? Just curious i seen this before and are you doing this to start the computer to use main timing instead?

[BigCE]

why did you cut post injection and cut out pilot after 2400?? Just curious i seen this before and are you doing this to start the computer to use main timing instead?

The computer always uses "main" timing, pilot timing is degrees before main timing not from TDC but "X" amount before main injection.

In my experience they respond better to only one injection event the best at higher rpms to make peak power. I usually dump it off after 2400-2600rpm ish, you cant even tell its gone unless you are free reving it in park. Then I just focus on the one event. This isn't a max effort tune keep in mind, its a strong tune but not everything its got strong. If I had to guess 125hp ish I dunno.

[tylerltr450]

Interesting. Im gona have to try and write something up with that and see how the truck likes it.

I always use the full maps but always looking at something different.

[Scarface]

I will take a look at ur tune as comparison to mine bigce

[Backhoe man]

I do not post much but I will try to help you a bit here. I also made a couple changes to your tune and will send it back to you. Your boost fuel limiter will need a little work, also you have a awful lot of main us for injectors that big. I would pull back to the 2200-2400 range and slowly move from there. I made changes to your base timing table only you might try that and see how it runs. Take a close look at limiters you have quite a few places that could use some work. For example you are commanding more timing than you have your limiter set to allow, there are also some fuel limiters that could use some work . I changed your boost equivalence table a bit , you will see it in the file I send you. Keep on making small changes and you will figure out what works for your set up and what does not.

[Scarface]

with that pulse width I had in that tune. what u think hp wise it could have made?