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Re: New to the tuning scene

Posted: Wed Aug 31, 2011 3:04 pm
by The1
i know what your saying, i just see the end result as what needs to be compensated for, how you do it is upto you, either way it's a pain.

Re: New to the tuning scene

Posted: Wed Aug 31, 2011 3:16 pm
by anarklov3r
Okay, So to confirm. leaving the ECU 100% stock, it should drive like it does now, and shift correctly.

Only if i adjust the PPK values to get the speedo correct, will I encounter these issues with the engine revving too high. And if i leave it alone, my speedo will just be out?

Am i able to adjust PPK values using FlashTool and Tuner Pro? Or will i need a Tech2? I'd much rather have a correct speedo and not get done for speeding...

But if all i have to do to get it to shift correctly with the modified PPK value is adjust the values in the Upshift / Downshift tables with scaled down values

EG First gear upshift is normally 0% TPS 20kmh and 100% TPS at 64kmh. If my first gear will now hit 5,300rpm at 56kmh, i can leave 0% at 20kmh, change 100% to 56, and smooth out all the values inbetween in the same fashion they are currently. This shouldnt prove too difficult i hope?

I'd imagine would only take an hour or two at most to do the maths, and I;d have a 100% accurate speedo again (i've already adjusted my PPK once before with a tech2)

Re: New to the tuning scene

Posted: Wed Aug 31, 2011 3:25 pm
by The1
if i remember correctly ppk is for manual and ratio is for auto, so you want to change the ratio scalar if that's what you want to do, use the calc i posted earlier. What size tyres do you have?

Re: New to the tuning scene

Posted: Wed Aug 31, 2011 3:35 pm
by anarklov3r
Ive got VX SS rims so 235/45X17

Re: New to the tuning scene

Posted: Wed Aug 31, 2011 3:38 pm
by Jayme
I think (though not sure) that the ppk in the tune and ppk in the dash are 2 separate items. adjusting the ppk in the tune will not fix your speedo, it will only screw up the shift points and make the internal pcm speedo read correctly. the physical speedo has its own internal ppk (which is what you adjust with a tech2) again, this is only as far as I am aware, anyone please feel free to correct me.

Re: New to the tuning scene

Posted: Wed Aug 31, 2011 4:40 pm
by Holden202T
ok this was a vs v6 auto but this what i did...

3.45 diff and tyres that ended up about 580mm diameter (normal commodore is about 620-30mm)

so i changed the VSS Ratio from 42.04 to 47.04

Detent Mode Upshift Speed Thresholds
1-2 from 66.79km to 54.72km
2-3 from 123.11km to 104.61km

similar was done with downshift thresholds aswell.

normal mode upshift lines ..... the below is the difference between mine and the stock tables (0% at top 100% at bottom)
1-2 2-3 3-4
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 -24.94
0.00 0.00 -14.48
0.00 0.00 -14.48
0.00 0.00 -14.48
-0.80 0.00 -14.48
-1.61 -4.83 -14.48
-1.61 -5.63 -14.48
-2.41 -3.22 -14.48
-1.61 -0.80 -14.48
-0.80 0.80 -14.48

normal mode had slighty more removed from them so it didn't rev as hard as power mode did.

I also changed 1-2-3-4 upshift minimum time limit from .4 sec to .10 sec

normal mode and performance mode desired shift time tables were also set to .15

aside from that really it was just playing with line pressures at certain points to get the desired results i wanted.

oh and i changed the rev limit to 5900rpm, but that was just for shits and giggles if it was left in D it wouldn't rev that far, only if i held it in gear manually.

I guess at the end of the day if you want an easy fquick fix then Jayme's option is fine, but if you want to do it properly so when you look at the tables the numbers are what you see in the real world then the above sort of stuff is what you need to look at.

If anyone wants a copy of my ecotec tune your welcome to have a look at it and let me know and i'll post it up, but it will not work properly in a normal commodore as it was designed to run in a Torana with body control module and has alot of normal stuff disabled for that reason.

Re: New to the tuning scene

Posted: Fri Sep 02, 2011 8:15 am
by anarklov3r
What does changing the minimum time limit do? Changing from .4s to .1s seems like a pretty big change, being only a quarter of its original value.

Also i dont seem to have a sperate force motor pressure for normal / performance. Just one for 0-110 and one from 110- 200 (rough values, cant open tuner pro to double check)

Re: New to the tuning scene

Posted: Fri Sep 02, 2011 8:44 am
by Jayme
the minimum time limit affects the closed loop learning ability... the pcm calculates how long each change takes, and applies a correction factor to the force motor pressure to keep the shifts in line with the time specified. if you increase the force motor pressure in the tune, it will learn that the shifts are too quick and learn to back off the pressure, bringing you back to where you started.

as for the 0-100 and 100-200 tables, they are mislabelled, one is for power, the other for economy. I cant rememebr which is which tho.

Re: New to the tuning scene

Posted: Fri Sep 02, 2011 9:12 am
by The1
no sure for vx, but vs adaptive shifting is only enabled in 1st gear between 18-100% tps.

Re: New to the tuning scene

Posted: Fri Sep 02, 2011 11:30 pm
by Holden202T
yeah as per what jayme said about mislabeled ... change one table and see if the effects are in performance or normal mode then you'll know which table is which.