I'm considering going on a dyno in the next week to see the 'real' effects of all the small things I've done to my tune. It's great to feal a difference on the buttdyno, but I want to have a more accurate reading.
So, let's say I'm a the point where I'd like to have a more realistic VE table then the S3. Will I get any positive results out of it ? Or is it way to much time consumming to tune (no datalogging, only a scanguage).
I have already figure out that I'd like to test:
- Effect of gay S3 timing VS raised timing at 20psi
- Effect of raised 'desired torque' on the previous tune (just discoved this one last week !)
- Effect of opened downpipe on previous tune (from 3"dp w/cat w/muffler on a 2.5" line)
Since this is going to take some time already, I'm wondering if it would be a good thing to play with the VE table. And most importantly, first learn how it works.
LA table de VE est l'efficacité volumétrique a un point donné, elle va affecté ton ratio air-essence a cette endroit. Dans ta tune Page Rankingécedent..tu arrivais a bien ajusté ton ratio essence?
Et pas de datalog...cé pas aussi facile a tuné...tout se passe très vite et sa devien difficile d'anlayser l'ensmble
LA table de VE est l'efficacité volumétrique a un point donné, elle va affecté ton ratio air-essence a cette endroit. Dans ta tune Page Rankingécedent..tu arrivais a bien ajusté ton ratio essence?
Et pas de datalog...cé pas aussi facile a tuné...tout se passe très vite et sa devien difficile d'anlayser l'ensmble
Effect of opened thing at 20psi. Effect of raised 'desired timing VS raised to test discoved time a good to play with this on thing if it w/muffler on the previous tune (just discoved this is on a 2.5" line). Since to test effect of raised to table. I'd like some already, I'd like to play with thing torque' on a 2.5" like timing if it wondering VS raised torque' one last discoved to table. I'd line).
Since the VE table. I'm wondering to take the previous tune (from 3"dp w/muffler on thing at 20psi
The second post is in a different language and the third post looks like hawkings wrote it.
To answer your question, tuning the VE is tough to do, simply because you have to be VERY certain you have all the other parameters right first, including injector flows (the big ONE), all the atmospheric modifiers, torque calc tables.
If you are confident that you have all the other tables set to what they really are, then you can back into the VE table by adjusting areas until you see your exact commanded AFR.
However, changing both the injector flow tables or the VE are essentially doing the same thing, only the injector flow tables are a lot easier and are more of a global modifier.
If you want to do this right, go and have your injectors flow tested at the various pulsewidths, and put those values in your injector tables. Dont ever touch them again, and begin tweaking your VE table. Just remember, increasing values in the VE table makes you run richer.
Effect of opened thing at 20psi. Effect of raised 'desired timing VS raised to test discoved time a good to play with this on thing if it w/muffler on the previous tune (just discoved this is on a 2.5" line). Since to test effect of raised to table. I'd like some already, I'd like to play with thing torque' on a 2.5" like timing if it wondering VS raised torque' one last discoved to table. I'd line).
Since the VE table. I'm wondering to take the previous tune (from 3"dp w/muffler on thing at 20psi
4:10am....dude, were you sippin on momma's cough syrup??
from the way i undertand it
you use the VE table to correct LTrim that are to far from zero
but if there all off then i would say modify fuel
but without datalog a would forget that
ps
ta table de timing a l'air de quoi ses temps-ci faut je my remette et la j'ai mixer un 3% de nitromethane dans mon methanol...on verra ben cosse ca va donne
ps
ta table de timing a l'air de quoi ses temps-ci faut je my remette et la j'ai mixer un 3% de nitromethane dans mon methanol...on verra ben cosse ca va donne
j'ai laché le timing, on va monter le boost à la place ça va prendre moins de temps !
thanks for the answers, I'll see for the important stuff first, then move to the VE table....
What I did is mess with my fuel trims FIRST. Once all fuel trims were practically dead on I modified the PE table. I set them all to the same number and did not touch the VE table. Once I got to the desired a/f at redline I then started modifying the VE table little by little. End result a tad richer on the initial hit, but 11.3-11.5 across the board at 20-21 degrees of timing....I am big turbo...just a FYI for timing sake.
My LTFT are almost at 0. I was adjusting them durint the end of the winter. I don't know why, but it seems harder to fine tune when cold. I was passing from -5 to + 5 at the same pulsewidth. When the weather got warmer, the LTFT would keep there average longer (-3@ 900, -4@1200, 0@ 1500 , etc).
Just to get an idea, what is the effect of a perfect VE table ? If I'm out a couple of AFR points (let's say .4 or .5 points off). What is the impact of tuning the PE and Timing with the wrong VE table ?
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How to tune the VE table ? (on a dyno let's say)
Linear Mode
