Question: vvt tunning

[malibu795]

with the completion of my dmax swap and shake down tow. i have noticed that the spool repsonse is slow then the stock IHI Lb7 charger. i would like to change that. question is how.. fuel is the quick answer but with stock 4l80 im basicly maxed out.. a more repsonsive turbo will result in better mpg esspecially when it comes to pulling hills.
cruising rpm with 4.63 gears and 32" tires is 1900-2500 or 55-70mph
one thing i noticed on my shake down tow.. when pulling 7% grade.. truck was floored at 2100rpm and only makeing 10-13psi. above 2400 i can get 20+ easy. either desried boost if off or VVT is off or combo of both

with that said. can i basicly take the VVT table and linear blend them? so the VVT would behave similar to a fixed AR charger.
example since i havent figured out how to screen shots

800rpm collum is stock 80% for basicly all of it.
1800rpm collum is stock 54% for basicly the entire collum.
3000rpm collum is stock 28% for basicly the entire collum

so the idea would be blend L-R 800 to 3000 collums.. granted a fixed non gated AR would have the same VVT% across the entire table.
pros cons?

 

[dmaxfireman]

did you try increasing desired boost to see if that was what was limiting you or if it was the desired / max vane %

 

[x MadMAX DIESEL]

What kind of vvt is it? Lly requires more vane position than the Lbz to substain high boost

Sent from my PC36100 using Tapatalk

 

[CrewCabMax]

its an LBZ van motor

 

[Hot COCOAL]

Is it possible the tc in the 4L80 is not set up well enough to accomodate the new charger. Newb Q

 

[malibu795]

At 250hp the complete stock tranny is more then capable of handling it. 550tq is limit for stock setup wot vvt% is 30% lbs truck stock tune will smoke a stock 4l80

 

[x MadMAX DIESEL]

Maybe I shouldn't say this is the "correct way"... But what I did is turned my max vane table up to like 65% from somewhere like 70+mm and 2200+rpm. Not exactly sure on the numbers but the wot throttle areas, which were my problem area. leave your desired position close to what it is. Desired boost is boost +atmosphere in the tables so 30# is really 45# in the table. Log desired vane and actual vane. Your vanes will close just enough to reach boost but staying under your max. you can then watch it real close to find out how much vane angle it needs at a certain rpm/throttle to get the boost where you want. If you leave your max angle way different from your desired angle, and it really needs alot more angle than desired you will get some good fluttuating of boost.

 

[malibu795]

ben i see what your talking about.. may not be 'perfect' but its sounds like a good starting point..
i was comparing the high med and low altitude vvt tables.. going to make somehtign between the high and med alt tables, since they are more flowing instead of spikey liek the low alt table is.. seams like a better starting point the my orginal idea and the vanes are tighter everywhere except WOT.. which is easy fix

 

[JoshH]

The desired vane tables don't really do much for boost. You need to look at max vane tables and desired boost tables.

 

[malibu795]

The desired vane tables don't really do much for boost. You need to look at max vane tables and desired boost tables.

took a look at those... didnt see any obvious placce where they were hitting the max target position..

how hard is it to setup the V2 flashscan for logging? simply insert and SD in it with corrisponding PIDs?

 

[x MadMAX DIESEL]

bbl is all I ever use. You don't need to an SD card, your v2 has storage space on it already.

 

[malibu795]

bbl is all I ever use. You don't need to an SD card, your v2 has storage space on it already.

how does one get the pids on it?

be really usefull since i will be hotshooting

 

[JoshH]

Open the V8 Scan and Tune software and click the BBL box on the left side. You can then use that window to load PID files into the V2.

 

[malibu795]

i have been playing with the B2214 VVT target tables.. i talk to couple people.. said i need to look at the VVT max tables B2222/3/4 to fix this problem.. it seasm related to the increase in displacement from the .020 over block.. do i opne the VVT up or close them up?

 

[MarkBroviak]

HI Adam,
This screen shot is showing one unhappy computer! I'm sure you have the egr valve unhooked and blocked right? If not start there. Otherwise you have a big miss match between desire boost and the turbo controls and that is why it is bouncing like this.

 

[malibu795]

Mark egr is long gone and have a non egr up pipein its place. Before it was place in the truck for the first time.
would the increase in displacement causing it to go nuts? I haven't messed with the vvt stuff since i put the new engine in... never had this problem with the stock on...

 

[malibu795]

Boost leak cause this? I see 29psig on hot or 44psia to the 40psia the ecm is seeing

 

[MarkBroviak]

Not so much the displacement but the pistons themselves and how they are firing the fuel. I had to change mine completely with my new build. It is a different beast.

 

[JoshH]

You can probably calm it down quite a bit with the PID controls.

 

[malibu795]

Hows that Josh?