horist

My Car keeps shifting at 63mph at WOT from 2 to 3

I think everything's right but I mustbe issing something!
RPM MPH TPS Timing KR O2 O2 Gear IAT TPS Voltage
6048 60 100 26.5 0 950 928 2 66 4.29
6092 60 100 26.5 0 946 941 2 66 4.29
6109 61 100 26.5 0 954 933 2 66 4.29
6157 62 100 26.5 0 950 928 2 66 4.29
6185 62 100 26.5 0 963 941 2 66 4.31
6211 63 100 26.5 0 950 928 3 66 4.29 SHIFT HERE
6239 64 100 26.5 0 954 928 3 66 4.31
6268 64 100 26.5 0 946 941 3 66 4.29
6291 65 100 26.5 0 954 928 3 66 4.29
6321 65 100 26.5 0 941 937 3 66 4.31
6339 65 100 26.5 0 959 933 3 66 4.29
6355 66 100 26.5 0 937 933 3 66 4.29
6361 66 100 26.5 0 954 928 3 66 4.29
6353 65 100 26.5 0 950 941 3 64 4.29
6297 67 100 26.5 0 959 928 3 64 4.29
6014 68 100 26.5 0 950 924 3 64 4.31
5861 68 100 26.5 0 954 933 3 64 4.29
5773 69 100 26 0 950 928 3 64 4.31
5727 69 100 26 0 963 933 3 64 4.31
5694 70 100 26 0 954 937 3 64 4.31
5683 70 100 26 0 963 924 3 64 4.29


Now here's how my tune is:
WOT Shift RPM 6000, WOT 2-3 shift 73
Gearing is fine and speedo isn't off

WOT Shift SPeed vs. Shift is set to 73 for Normal hot and performance
WOT Shift RPM vs Shift is at 6000 for all
WOT Enable TPS% is 90% disable 85%
and for ***** and giggles i set the Shift Speed vs. TPS vs Shift to 73mph for anything above 90%


Only other trans tables modified are:
Desired Shift time vs Torque zeroed out

TCC Lock During shift set to No
And TM tables are zeroed out
but it still keeps shifting at 63mph

I put the car in 2nd and held the shift out (damn slow *** TACH)
6198 62 100 26.5 0 924 920 2
6221 63 100 26.5 0 937 907 2
6239 64 100 26.5 0 924 920 2
6270 64 100 26.5 0 937 911 2
6297 64 100 26.5 0 928 915 2
6318 65 100 26.5 0 924 924 2
6331 65 100 26.5 0 937 911 2
6372 66 100 26.5 0 928 911 2
6385 66 100 26.5 0 924 915 2
6412 67 100 26.5 0 928 911 2
6434 67 100 26.5 0 928 911 2
6445 68 100 26.5 0 920 924 2
6468 68 100 26.5 0 924 915 2
6499 68 100 26.5 0 937 911 2
6513 69 100 26.5 0 928 915 2
6541 69 100 26.5 0 941 920 2
6552 70 100 26.5 0 946 915 2
6578 70 100 26.5 0 933 907 2
6593 71 100 26.5 0 928 915 2
6625 71 100 26.5 0 924 920 2
6628 72 100 26.5 0 946 894 2
6657 72 100 26.5 0 915 902 2
6669 72 100 26.5 0 924 898 2
6690 72 100 26.5 0 907 920 2
6684 73 100 26.5 0 941 907 2
6702 73 100 26.5 0 920 898 2
6726 73 100 26.5 0 907 898 2
6750 74 100 26.5 0 902 902 2
6756 75 100 26.5 0 963 881 2
6793 75 100 26.5 0 959 885 3
6732 75 100 26.5 0 889 837 3
6793 75 100 26.5 0 907 881 3
6827 76 100 26.5 0 937 898 3
6836 76 100 26.5 0 924 868 3
6858 77 100 26.5 0 920 872 3
6877 77 100 26.5 0 911 863 3
6874 77 100 26.5 0 941 894 3
6849 77 100 26.5 0 950 894 3
6899 77 100 26.5 0 933 863 3
6902 77 100 26.5 0 920 902 3
6912 78 100 26.5 0 920 872 3
6918 78 100 26.5 0 933 894 3
6830 78 100 26.5 0 807 850 3
6564 80 100 26.5 0 937 820 3
6260 80 100 26.5 0 911 885 3
6070 80 100 26.5 0 924 894 3
5971 80 100 26.5 0 924 907 3
5912 81 100 26.5 0 920 911 3
5891 81 100 26.5 0 928 907 3


Fuel cutoff is 7000 rPM and i didn't hit it


Any suggestions?


(Tranny is vacuum modulated so line pressure tables don't matter)

The strange thing I've noticed is that even though the PCM issaying it's in 3rd gear (at the shift point) the RPMs are still rising after a shift.. maybe just because the scanner logs so fast?but regardless I can feel the shift and it's happening just above 60 on the speed before 65... it should be holding it out another 10mph ...

Should I just bump the 2-3 shift up some? or maybe make the RPM for WOT shifts 6500 or so so that it won't shift until that RPM is reached?

Sunset01

I have/had a similar issue.
Take a look at a gear/rpm/mph calculator:
http://www.f-body.org/gears/

At 6100 rpm, assuming about 25.4" effective diameter
tire (what do you have set to in ls1edit) and your 3.73s,
at 6100rpm, you should be at 76mph.... you're at 61mph,
which indicates 20% slippage on the torque converter...
I had about 20% at 5000rpm and maybe 15% at 6000 and
my torque converter showed 35mph loss ulocked vs. locked.
I think your torque converter is set up too loose. & what I
think happens is the computer sees massive slip and decides
it better play it safe and shift early. I could get it
to shift later by ramping up rpm's but obviously it's a band
aid. A decent converter should not be slipping that much
at that far past it's stall rating. My converter is on it's way
back to me set up tighter.. they also though the sprag in the
stator could have been defective- that got changed for
good measure as well. They were supposed to throw it
on the dyno before it left too. I plan to post my results
after I'm back together... going to prove less slip with logs
similar to yours on street and then redyno.

Dean

horist

the verter was just freshened up though... ah well... guess I'll see... I bumped up the RPM to 6400 where it should shift so that should get me closer to 68mph

http://www.horist.com/MPHCalc/MPHCalc.asp

heh I made a form like that one too... I started just wanting to quickly calculate the number of RPMs required to add 1MPH in a give gear... but then added gears 1-6 like that site

Sunset01

I undestand it was freshened up, but from the little I know of stall converter builds, it's as much art than science in building the right amount of vane angle, clearance for a particular motor's power output. I bet if you dyno locked vs. unlocked you'll show at least 30hp loss... again purely because of the amount of slip you are showing at 6000 rpm.

Dean

Magnus

iTrader: (4)

The problem is some tuner products do not adjust all the values needed to properly calculate for gear/tire combo's.

Try the new value I gave you Mike, it should fix your problem.