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Old 07-07-2013, 03:17 PM   #1
big dave
 
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Question about stall converters.

Up until now, the stall converter was one of the most effective mods anyone with an auto could do. One of my first mods to my lt1 was a converter...the ls1 guys sweared by them. Why are folks not trying them as a simple bolt-on mod for the ZL1s? Is it the warrantee?

I would imagine that a converter alone in one of these cars has got to be good for at least .4 in the quarter. Though I was able to get a 1.74 60' on street tires on my 11.9 pass, I'm sure that with a good converter and a set of drag tires, I could run an 11.4 with nothing else done.
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'13 ZL1 BRM A6. 11.74 @ 120.14 factory stock! Best stock mph 121.8. 11.59@121.4 with Roto Fab
http://youtu.be/spQLaTWbThs

'94 Z28 A4. 13.64 @ 100.1 stock. 11.71 @ 117 h/c

'99 SS M6. 13.28 @ 105 stock. 12.02 @ 116.5 bolt-ons on street tires. Full weight. New combo 10.94 @ 126.9 n/a full weight on et streets. .http://youtu.be/BCJNFJrp2lg
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Old 07-07-2013, 05:15 PM   #2
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I am considering this to be my next mod.
I need to get educated on the subject. Hopefully some good info comes out of this thread.
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Old 07-07-2013, 08:51 PM   #3
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leave it stock unless you are going for the "ultimate track time" 1.57 is my best 60' with my stock tc. Many vendors left their tc stock for low 10s...spend money elsewhere IMHO
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Old 07-07-2013, 11:35 PM   #4
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They are worth the money BUT trans tuning with the 6l90 can be something that can make or break a gm eith 6l80-90 car..
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Old 07-08-2013, 05:39 AM   #5
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I ran a Yank PY3400 on my former 99 procharged LS1. It woke it that car.
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Old 07-08-2013, 10:55 AM   #6
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Quote:
4480# raceweight
Big Dave, how much does the car weigh stock?

If you can 60 a 1.7 stock I'd probably do a set of drag radials before I did a converter. Stephen's almost in the 10's without one.
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Old 07-08-2013, 05:18 PM   #7
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Quote:
Originally Posted by Pro Stock John View Post
Big Dave, how much does the car weigh stock?

If you can 60 a 1.7 stock I'd probably do a set of drag radials before I did a converter. Stephen's almost in the 10's without one.
I figure the car should be somewhere around 4230. I'm 240, plus I might have had around 10 extra pounds of junk in the trunk. Funny thing is that one track said 4380, another said 4480. I figured the latter was correct since the car is an auto with a sunroof. I think the manuals come in around 4100 lbs.
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'13 ZL1 BRM A6. 11.74 @ 120.14 factory stock! Best stock mph 121.8. 11.59@121.4 with Roto Fab
http://youtu.be/spQLaTWbThs

'94 Z28 A4. 13.64 @ 100.1 stock. 11.71 @ 117 h/c

'99 SS M6. 13.28 @ 105 stock. 12.02 @ 116.5 bolt-ons on street tires. Full weight. New combo 10.94 @ 126.9 n/a full weight on et streets. .http://youtu.be/BCJNFJrp2lg

Last edited by big dave; 07-08-2013 at 06:01 PM.
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Old 07-08-2013, 08:20 PM   #8
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Quote:
Originally Posted by big dave View Post
I figure the car should be somewhere around 4230. I'm 240, plus I might have had around 10 extra pounds of junk in the trunk. Funny thing is that one track said 4380, another said 4480. I figured the latter was correct since the car is an auto with a sunroof. I think the manuals come in around 4100 lbs.
my car is exactly like yours auto/sunroof and it weighs right at 4400 race weight. Do drag radials, pulley, tune, air intake first before you stuff a looser torque converter in your car. Normally aspirated cammed cars...definitely need a looser converter but the ZL1 has tons of low end torque. You will find it difficult enough to hook with the stock converter without shocking the car even more with a looser converter. IMHO.
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Old 07-09-2013, 04:19 PM   #9
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Quote:
Originally Posted by big dave View Post
I figure the car should be somewhere around 4230. I'm 240, plus I might have had around 10 extra pounds of junk in the trunk. Funny thing is that one track said 4380, another said 4480. I figured the latter was correct since the car is an auto with a sunroof. I think the manuals come in around 4100 lbs.

BIG DAVE
IF YOU RAN A 1.6 60' TIME ON STOCK TIRES WHAT KIND OF TIRE PRESSURE WERE YOU RUNNING. WHAT SIZE TIRES/BRAND. THE BEST I CAN DO AT A MILE HIGH IS 1.897 60' TIME ON STOCK GOODYEARS.
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Old 07-10-2013, 04:19 PM   #10
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TCI has an adjustable torque converter that looks good. It costs over $1500.00 though. They claim it will will drop 7/10 sec. in the 1/8 mile and will hold up better than stock if you do power mods. Also it will bolt right in without any type of tuning. I considered getting one but I would have to pay to have it installed because I don't have access to a lift. I really don't want to pull the tranny with car on the ground. I know installation has to be expensive. If anyone has installed this please let me know what you think of it.
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Old 07-11-2013, 09:12 AM   #11
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Quote:
Originally Posted by BigDD View Post
TCI has an adjustable torque converter that looks good. It costs over $1500.00 though. They claim it will will drop 7/10 sec. in the 1/8 mile and will hold up better than stock if you do power mods. Also it will bolt right in without any type of tuning. I considered getting one but I would have to pay to have it installed because I don't have access to a lift. I really don't want to pull the tranny with car on the ground. I know installation has to be expensive. If anyone has installed this please let me know what you think of it.
7/10s in a 1/4 are hard to believe
7/10s in the 1/8th. That would be magic.
If they guarentee results and have testing to back it up I am sure people would be all over it.
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Old 07-11-2013, 08:51 PM   #12
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Quote:
Originally Posted by Trackman View Post
7/10s in a 1/4 are hard to believe
7/10s in the 1/8th. That would be magic.
If they guarentee results and have testing to back it up I am sure people would be all over it.
I have some fairy dust to sprinkle for 7/10s too...
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#917 A6. 10.67@126.2 1.53 60' ATI/Lingenfelter balancer (10" ring), stock upper pulley, 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Lingenfelter idler relocation bracket, NGK TR7ix, 160 t-stat, Dewitts Radiator, Texas Speed 1 7/8" headers(no cats). M&H drag radials 325/45-17 & M&H 28x4.5" bias skinnies. Tuning by Frost at Performance Autosport in Richmond, VA (804) 358-2505
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Old 07-15-2013, 11:38 AM   #13
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Quote:
Originally Posted by Stephen12ZL1 View Post
my car is exactly like yours auto/sunroof and it weighs right at 4400 race weight.
Wow no kidding, my SS 1SS is 3980 with me, some small weight reduction.

If I had gotten a ZL1 I'd do a pulley, heat exchanger, probably a trans cooler, air intake work and a tune, seems like low 11's should be no problem.
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Old 07-15-2013, 03:35 PM   #14
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Big stall converters helped to launch an N/A car (LS1, LT1) but it's not as necessary in a supercharged LSA.

Also they help with shift extension and flash points on 4 speed automatics that have only 3 usable gears that are spaced rather far apart. The 6 speed automatics have more usable gears spaced closer together, thus there is less need for stalls.

Not that a stall wouldn't help, but it's not as necessary with a 6 speed auto and gobs of torque from the engine.
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Old 07-15-2013, 05:10 PM   #15
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Quote:
Originally Posted by EFI View Post
Big stall converters helped to launch an N/A car (LS1, LT1) but it's not as necessary in a supercharged LSA.

Also they help with shift extension and flash points on 4 speed automatics that have only 3 usable gears that are spaced rather far apart. The 6 speed automatics have more usable gears spaced closer together, thus there is less need for stalls.

Not that a stall wouldn't help, but it's not as necessary with a 6 speed auto and gobs of torque from the engine.
Wise statement/post
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#917 A6. 10.67@126.2 1.53 60' ATI/Lingenfelter balancer (10" ring), stock upper pulley, 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Lingenfelter idler relocation bracket, NGK TR7ix, 160 t-stat, Dewitts Radiator, Texas Speed 1 7/8" headers(no cats). M&H drag radials 325/45-17 & M&H 28x4.5" bias skinnies. Tuning by Frost at Performance Autosport in Richmond, VA (804) 358-2505
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Old 07-15-2013, 06:20 PM   #16
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.5 sec improvement here with the 6L80e. .5-.7 with the 4L60e versions.
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Old 07-15-2013, 07:13 PM   #17
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It's difficult to imagine this car not picking up at least .3 with the stall... and nothing else. I realize it's not a simple procedure, but I think the heavyweight ZL1 would really shine with the stall to take advantage of lsa torque.
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'13 ZL1 BRM A6. 11.74 @ 120.14 factory stock! Best stock mph 121.8. 11.59@121.4 with Roto Fab
http://youtu.be/spQLaTWbThs

'94 Z28 A4. 13.64 @ 100.1 stock. 11.71 @ 117 h/c

'99 SS M6. 13.28 @ 105 stock. 12.02 @ 116.5 bolt-ons on street tires. Full weight. New combo 10.94 @ 126.9 n/a full weight on et streets. .http://youtu.be/BCJNFJrp2lg
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Old 07-15-2013, 07:16 PM   #18
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Originally Posted by SC2150 View Post
.5 sec improvement here with the 6L80e. .5-.7 with the 4L60e versions.
Who on this forum has seen a .5 improvement from a converter on a 6L80 /6L90?
Please come forward.
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Old 07-15-2013, 08:11 PM   #19
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I have a 3000 stall converter that flat woke up the acceleration when stock.Now that ADM has worked his magic on my ZL1 (750/800hp),i can at 45mph cruise,nail the throttle and leave 2 patches of rubber 20' long.
I have not run it at the strip yet even though i do have drag radials and 6" fronts that i havent tried yet.The spool up and acceleration is incredable.
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