Max Vane
- Thread starter Killerbee
- Start date
I just remembered I also have maf limiting tables. Maybe I just need a little more fuel in the spoolup regions with more airflow?
if you want to send me your tune, I will compare it against your log for correctness.
Vane position begins to decrease well before your set point (desired) boost is realized. This is integral control logic at work.
Use your brakes to induce the load you want at a constant speed, and hold it here for a few seconds. Then play back the log overlayed onto your boost C table. Assuming you are 13.9 baro or higher.
Vane position begins to decrease well before your set point (desired) boost is realized. This is integral control logic at work.
Use your brakes to induce the load you want at a constant speed, and hold it here for a few seconds. Then play back the log overlayed onto your boost C table. Assuming you are 13.9 baro or higher.
these are always a factor. I don't like smoke, so i find a happy medium. You can use the Equivalence Ratio PID to rationalize more or less fuel. If you don't know what this is, don't worry about it.
Ok thanks for the help I will send you my tune. I know what equivilance ratio is but the only thing is with a modified pulsewith table I would think it would not work. It would be nice if we had a bigger pw table that had more mm3 on it.
On quick view of your tune and log, it gives every indication that your vanes are getting hung up over 95% (when max table says 80ish). It could be that the 90+ positions tend to jam. But you are definately overboosting with the assistance of the vanes. Frame 1395 is a prime example.
I am betting somebody else has already seen this happen.
I am betting somebody else has already seen this happen.
I went and loaded your desired vane position in the log strip. The desired vane is not making sense per your tune. Are you sure the log above, and the tune you sent me, go together? There is a lot of 100% command happening.
I pretty sure it is the same tune. I will reflash it and take another log. I don't see how it could command 100% when I still have the stock Max vane tables in my tunes?
I looked back at my logs and I saw the 100% vane position while desired was at 88% but it was while it was coasting at 42mph with no throttle. It was never over 88% at WOT, only when I was off the throttle?
Ok I think your looking at the wrong log this is the one you need.
This is the log I took after putting the mouthpiece on.
This is the log I took after putting the mouthpiece on.
FWIW, not too long ago my vane position "stuck", I dont remember if it was more on the open or closed side, really doesn't matter. Anyway, turned out I had a bad ecm. Now, the dealer wanted to sell me a new ecm for $1500 
but there are several good vendors here that sell them for significantly cheaper, say by 2/3rd's.
but there are several good vendors here that sell them for significantly cheaper, say by 2/3rd's.
It did for mehook up a drive pressure gauge, it will open your eyes
Then dont call it drive pressure and just use it as a tool:hello: Im suprised you wouldnt be interested in what the turbo tuning is done to your drive
I agree
I dont understand it....but I also know it doesnt do squat!
So does anyone think 100% vane or close to it is beneficial to spoolup at low boost?
Stock seems to think it should never go above about 85% under 2400rpms?
Stock seems to think it should never go above about 85% under 2400rpms?
I've never seen a need to go anywhere near 100%. A max of under 90% will spool fast enough to break tires loose at 35+mph on dry pavement. There is a lot more to tuning for fast spool up than VVT tables.:cool2:
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It did for me
I dont understand it....but I also know it doesnt do squat!
I think i figured out how to MAKE the target position table work....... Short on time--thought i would stop in---ill look at the table later that I THINK will enable or disable those tables.......the target table works FINE at idle--keep that in mind.
So I guess I need to figure out how to make it not command 60%vane position when it is at full spool already overboosting.
At high fueling (80mm+) you shouldn't need anything over 60% from 2400 RPM and up - Vane Position should be dropping off as RPM goes up.
This basically acts as a waste gate (and is the reason VVTs don't have wastegates) and lets air through the exhaust housing without it having as much affect on the turbing wheel.
In reality you are changing the AR of the exhaust housing - the air isn't bypassing like it does with a waste gate.
KB you like to experient with air flow stuff and spreadsheets how about you take a stock turbo and figure out the AR of the exhaust side based on Vane Position and come up with a table for us.
Example:
100% - .75 AR
90% - .8 AR
80% - .89 AR
And so on.........