Converter is installed, have some shifting concerns
02-09-2009, 06:41 PM
#1
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Converter is installed, have some shifting concerns Today I installed a Circle D 3c in my '01 Z28.
The transmission has been built plus it has a TransGo HD2-b kit with the internal mods, upgraded 3-4 clutch, etc.
When I built the trans I adjusted the clutches and seperator plate hole sizes to get the shifts like I wanted them, also some tuning.
With the stock converter the average shift time was .3
Programmed shift times are .3 to .1
Now with the converter installed the actual shift times are 1.4 up to 2.4
So does this mean the clutches are slipping 2.4 seconds during those shifts?
With the new converter the shift times do get quicker if I manually shift at high rpm.
Seems to me like the trans is going to burn the clutches up if I leave it like this.
So is the 2.4 shift time the amount of time the clutches are slipping during shifts?
The transmission has been built plus it has a TransGo HD2-b kit with the internal mods, upgraded 3-4 clutch, etc.
When I built the trans I adjusted the clutches and seperator plate hole sizes to get the shifts like I wanted them, also some tuning.
With the stock converter the average shift time was .3
Programmed shift times are .3 to .1
Now with the converter installed the actual shift times are 1.4 up to 2.4
So does this mean the clutches are slipping 2.4 seconds during those shifts?
With the new converter the shift times do get quicker if I manually shift at high rpm.
Seems to me like the trans is going to burn the clutches up if I leave it like this.
So is the 2.4 shift time the amount of time the clutches are slipping during shifts?
02-09-2009, 07:03 PM
#2
no the clutches and the shifts are unchanged
the scanner reads the engine rpm and output speed you have a normal slip of the converter to take into account , You clutches are fine just the coupling at low RPM through the converter is less than with the stock one, The difference in readings is that loss. Remember the 60e has no input speed sensor soyour reading through the converter
the scanner reads the engine rpm and output speed you have a normal slip of the converter to take into account , You clutches are fine just the coupling at low RPM through the converter is less than with the stock one, The difference in readings is that loss. Remember the 60e has no input speed sensor soyour reading through the converter
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02-10-2009, 02:23 PM
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Down low it's a little looser than I expected, but I honestly think I will get used to that and end up liking it.
I like how I can hit the throttle maybe 20% and hold 2500 rpm through all gears, that is until it locks up lol.
Is it going to be alright having the lock up drop rpm approx 1500 rpm when driving around town? Or should I tune it differently? Like when I pull out in traffic and accelerate normal, it just stays at 2500, shifts through the gears, and bam- lock up.
Other than that WOT is right on, didn't have to tune anything for that btw.
I can go wot anytime and it's right where it needs to be.
It's been a good experience, from placing the order up to driving it(after tuning)
Thanks a lot.
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02-10-2009, 04:50 PM
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It's a Circle-D 3c
Not sure what to make of this pic below. Footbrake at 3592 rpm and 24 rpm input shaft speed
"3C" = 3400-3600 Flash Stall. A little more noticeable on the street, but still very little pedal to get moving. Will have better performance because of the higher flash and will hit harder out of the hole. Footbrake a little higher - 2600-2700.
02-10-2009, 05:12 PM
#9
Me either since the 4L60E does not have a sensor for the input shaft lol . The pcm can only see engine rpm and output speed. Now the 80E does have one so thats probably why its in there. The 60/65/70e all got input speed sensors in 2008but not in your year
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02-10-2009, 05:18 PM
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Maybe it's a calculation of what it should be going off engine rpm and output rpm.
I would ask in the HP Tuners forum or the PCM forum here but I just hate seeing posts disappear off the board with zero replies because no one knows. It seems I always have solid proof of something happening that no one can figure out lol.
02-11-2009, 09:04 AM
#19
Whatever it takes, full stall or not I'm looking for the math on how input speed is determine.
So you don't know the math to figure this I take it? If you know you can give a mathematical equation without knowing specifics, which are:
1st 3.06
2nd 1.63
3rd 1
4th .7
And during the screenshot it was locked in second.
No matter how you calculate it, it's not how input shaft speed is determined.
I'm assuming you don't know either.
I was hoping someone who knew something would chime in, but hptuners board members and people here I guess simply don't know.
So you don't know the math to figure this I take it? If you know you can give a mathematical equation without knowing specifics, which are:
1st 3.06
2nd 1.63
3rd 1
4th .7
And during the screenshot it was locked in second.
No matter how you calculate it, it's not how input shaft speed is determined.
I'm assuming you don't know either.
I was hoping someone who knew something would chime in, but hptuners board members and people here I guess simply don't know.