11-15-2017, 01:13 AM | #15 | |
Drives: 2017 Camaro; 2017 Acadia Denali Join Date: Jun 2016
Location: Chicago, IL/Williams Bay WI
Posts: 1,022
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Quote:
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11-15-2017, 04:29 AM | #16 |
Drives: 2016 2SS Join Date: Jul 2016
Location: Sanford NC
Posts: 2,766
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Basically what Tommy said. The converter puts you into your power band almost immediately. The converter passes right through the low rpm "lug" points and puts the car in a better spot for acceleration. You have to learn to be a little more judicious with your right foot in normal driving situations. With the lock up you don't really lose anything mileage wise on the highway.
Shift extension with the converter is a tricky deal. I lock the converter as soon as possible so my shift extension is the same as stock. But the 1/2 shift now only drops about 700rpm opposed to where it used to drop about 1,500rpm. But with these cars and all the gears you are losing mph with the converter unlocked. You need to lock it as soon as you can from my findings.
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2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.
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11-15-2017, 08:53 AM | #17 |
Drives: 2016 White 2SS Vert A8 Maggie S/C Join Date: Oct 2016
Location: Lodi, CA
Posts: 150
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Thank you, probably won't track it just some spirited driving in the hills. Assuming this would help with the lug that is created due to the car wanting to get to the highest gear possible on its own for fuel efficiency?
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11-17-2017, 01:33 AM | #18 |
Drives: 2017 Camaro; 2017 Acadia Denali Join Date: Jun 2016
Location: Chicago, IL/Williams Bay WI
Posts: 1,022
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No. That's the way ever GM trans I've used in the past 30 years has been. You would need a trans tune, or manually shift it yourself to get it to hold gears longer.
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This is in no way a personal attack or confrontation, and is not necessarily the view
of the management or sponsors, and the thoughts contained herein are mine, and is not intended to hurt anyone's feelings or ruin their delicate self esteem, or to invalidate anyone's personal views or thoughts, nor is it a condemnation of anyone's race, religion, sex, sexual preferences, handicaps, or intellectual abilities. |
10-19-2020, 06:22 PM | #19 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,201
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Has the consensus on stall torque converters for the 8L90 changed over 3 or 4 years. I know GMPP still makes one, so if they make one you figure its got to help somewhat.
I know for sure no one will ever convince me that a stall torque converter "adds" power, it can only "take away" power, any time the torque converter is unlocked less hp is going to the tires, instead it goes to making your trans temps hotter. Its understandable that the 4L60/4L80 stuff desperately needs one since there is only basically 2 useable gears at WOT when on the stock TC. I guess im different that most people and I find the stock torque converter on the 8L90 seems almost as tight as a 4L60 stall? |
10-19-2020, 06:47 PM | #20 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,201
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So I was curious and on my way home I pulled out HP Tuners and used the DVT tool to force the torque converter to stay unlocked since I wanted to see how it drove. It helps absorb lot with the off throttle on breaks downshift clunking and clancking too.
I turned the draggy on since I wanted to see how it would do with no TC lockup and I just got my fastest 0-60 time ever by about .04 seconds. I know the TCM dosen't lookup at WOT until late second gear by the time its at around 50 mph probably and it slowly slips into full lock. I hear all the time people say they go faster with the TC unlock but its just hard to believe. |
10-19-2020, 10:14 PM | #21 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,796
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I don't know anybody that ever said a stall converter adds power. What it does do is multiply torque. Normally the higher the torque multiplier (STR) the less efficient the converter is up top. So it hits hard and tapers off. However that shouldn't be a issue with 8l90 converters since they are triple disk units that can be locked @ WOT
I believe I mentioned to you a long time ago that unlocking the converter part throttle helps a ton with how the trans behaves. All the part throttle lock up does is slightly improve fuel mileage at the expense of drive-ability. Any vehicle I have ever tuned, I disable lock up until the final gear. I also run mine unlocked @ WOT because the stock converter is tight and I run a taller tire...so it helps with shift extension. my Dragy times are faster unlocked.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-19-2020, 08:29 AM | #22 |
Drives: Camaro V6 2017 Join Date: Jan 2020
Location: TX
Posts: 73
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Can someone please explain to me what is locking and unlocking of a torque converter? How do you do it?
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11-19-2020, 09:51 AM | #23 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,796
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8l90 converters lock at both part throttle and wot for improved efficiency. It almost feels like another upshift but it's not. Imo it makes the transmission feel annoying like it's always shifting and more jerky. In the transmission/torque converter/apply/release section of HPtuners you can adjust the TCC settings for "Speed" and "Full throttle". If you change the settings so the converter stays unlocked it will flare up a few hundred more rpm on tip in throttle to accelerate. It also hits harder from a roll that way. The caveat is you lose some efficiency and a little fuel mileage. You also get a slight increase in trans fluid temp but not enough to be of any concern.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
12-01-2020, 11:50 AM | #24 |
Drives: 2016 2SS blue velvet w/blk stripes Join Date: Sep 2017
Location: Tulsa, OK
Posts: 43
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So what converter is best for occasional drag racing on a mostly street driven car with drag radials. Do you need to have the transmision reprogrammed?
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12-01-2020, 05:21 PM | #25 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,796
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3600 is a good all around NA converter. Yes tuning will be required.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
07-10-2021, 10:39 AM | #26 |
Drives: 2014 Camaro SS Red Hot Join Date: Jun 2014
Location: Landis, North Carolina
Posts: 815
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Circle D torque converter
Can anyone tell me the diameter to get for a stall converter? Looking at one that is 2600-3200 and is 11.5 diameter so its for my car which is a 2014 Camaro SS that is supercharger with 600 RWHP? All help is appreciated just never went down the stall converter road
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07-10-2021, 10:47 AM | #27 | |
Drives: 2014 Camaro SS Red Hot Join Date: Jun 2014
Location: Landis, North Carolina
Posts: 815
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Quote:
Sorry didn’t mean to post here, was trying to ask for help which now i see is in the wrong place, my bad Sent from my iPhone using Tapatalk |
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