Manual trans smoke issue

[straight6]

Im just trying to see if this is normal or if i need to do adjusting and were. I have my tune dialed in pretty mich right were i want it. Good smooth power some but not too much smoke. But i have the 6 speed trans in an 06. And every shift i make it lets out a little puff of smoke When clutch is released and back on the throttle. And if im lower in the rpm range and stand on it i could kill small forest creatures with the cloud i let out then its clear. I am running stock injectors and my rail pressure is mainly around stock pressures just moved around a bit indifferent areas. Im also running a silver bullet 62 turbo.Is this just something i have to live with since im loading the engine all the time and loosing all boost built up between shifts? I have pulled all the duration i can without sacraficing any power and i have adjusted up my boost fueling table and still seemto get just as mich smoke. Any insight on were i should focus on or is this just a manual trans thing. Thanks guys

[anarchydiesel]

It can be done. I would suggest spending some more time on the boost limited fueling table. Remember that the table includes atmospheric pressure so you don't come up on any boost until the 20psi range.

[2007 5.9]

Yes ^^^^ that table can make or break a smoke issue on a tune....

[straight6]

Sounds good ill give that a shot. Should i put some duration back in and focus on that table for the smoke? I just kept pulling duration in the areas of my log were shifts occured. And now that i think of it its a little laggy for a split secong after a shift. Ill see about puting some back in and see what happens. Thanks for the advise guys. 07 5.9.... You the famous les? Lol

[anarchydiesel]

If the truck runs good everywhere else with the added duration then yes, put it back in. There are times that the truck may use those duration cells when there is boost to go with it so then the fuel can be used. The boost limiter is what will eliminate the smoke. I can make a tune that smokes like a freight train down low and clean it up without much more than adjustments to the boost limiter.

[2007 5.9]

Sounds good ill give that a shot. Should i put some duration back in and focus on that table for the smoke? I just kept pulling duration in the areas of my log were shifts occured. And now that i think of it its a little laggy for a split secong after a shift. Ill see about puting some back in and see what happens. Thanks for the advise guys. 07 5.9.... You the famous les? Lol

Id put the fuel back in as described above...and Id focus on that limiter table.

Remember you CAN rescale it to suit your needs...as it is a BOOST table.

Famous...no. Les..yes

[straight6]

Ive been messing with it and i seem to have the shift smoke pretty much smoke free but 5th and 6th at 2k rpms gag it ad shell let go a cloud that is actualy like a hurricane of haze. Its not black but grey. But its alot. Also my egts are running into the 1400 range. Should i use the boost tabe to try and keep them under control
Up top also? I am at around 25 degrees timing at full mm3 and 3200 rpm so i really dont want to add anymore timing. Should i go back and pull some duration again? I would like to be under 1300 degrees matted and not have to live watching my gauge. Or you guys think 1400 is ok. I really appreciate your help. It just seems when i fix something another thing goes the other way or another condition starts lol.

[anarchydiesel]

stock trucks will see 1400 regularly when loaded pulling a hill. How big of a tune are you trying to build? I limit my tuning to 28-30 degrees max timing but that is on a very large tune.

[straight6]

Ive built a modest street tune. Still on stock fuel system ect. I do run a phat shaft 62 turbo. Surprised my egts are even n issue but stock i would not be concerned. But with added timing most that heat im reading is on the pistons not just hot air. My egts are controlable till im heavy in it in the upper rpm range. It hits 1400 n will continue to climb if i stay in it.

[Jstewy21]

I wouldn't be too concerned with 1400, unless you tow regularly. Pretty much any 6.7 with a stock turbo and modified tune will touch 18-1900 floored through the gears. Used to see some duramaxes hitting 2000+, it's all about how long it is at that temperature.

[straight6]

Well how long is too long. I understand 5 mins at 1500 degrees is prob not good but if i peg my 1600 deg gauge for say 1amd a half mins? Is that acceptable?

[bcbracing]

No, holding it at that temperature for any longer then 20-30 seconds is to long. Repeated pulls with that much heat could start burning valves and roasting your turbo.

[2007 5.9]

If your holding it WOT for anything more than 30sec your probably going well in excess of 120mph..which is more of your issue than excessive EGT's.

I sled pull at 1800+ at 4500rpm for typically 20sec and its fine, but with lowish timing.

As you get the timing up, the shorter the time frame you can hold 1600*. As the timing moves the heat from the piston crown to the exhaust as its lower and with increased timing the heat is kept in the cylinder longer thus putting pistons at greater risk.