>>>LET High-Stall Torque Converter (HSTC)<<<
Member
Joined: Sep 2008
Posts: 142
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From: Illinois
2006 E55 2005 Crossfire SRT-6
Ok ok ok.....Im here finally. I have the LET High Stall in my Turbo'd Crossfire and absolutely love it. With the stock converter I was only getting about 11-1200 rpms when trying to launch with the beast of a GT35R turbo and only get 1-2lbs of boost. Now I see between 22-2500 rpms and 10lbs of boost and she hauls ***. . Driveability is a lot better too! No more hunting for gear at a 45 mph cruise, the 1500 rpm stutter is non existent and when you hit the kick down switch...the converter loads and sends the car flying.
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Joined: May 2008
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2006 E55 AMG
I'm also curious to hear from members and not vendors on this product. Does anyone have any before and after track numbers with this HSTC from LET? I have a E55 and I would love to get my 60' times lower. Right now no other E55 on here or dragtimes have out 60' me with a HSTC or stock. My best 60' passes to date are 1.585, 1.586, 1.587, 1.588, and (2) 1.592. If I could improve on this please let me know.
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Joined: Aug 2006
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From: Keesler AFB, Gulfport, MS
C32 AMG
Jerry initially said the ECU tune would get rid of the jerk. It did...for a couple days. If this HSTC was able to get rid of the jerk permanently, it would be well worth it for that alone!
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Joined: Nov 2001
Posts: 1,289
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From: OC
C32
I am all for getting rid of the jerk but how is it in everyday driving. If the lockup has been shifted to 2K rpm or so from 1200-1500 rpm does the motor rev up to 2k before you go anywhere?
I have never driven a car with a high stall converter in it.
I have never driven a car with a high stall converter in it.
Super Member
Joined: Aug 2009
Posts: 983
Likes: 2
From: USA
Marsaydees
) and the converter stays pretty tight even off idle. back in the day (and some current crappy manufacturers), high stall torque converters were really loose and sloppy, but this does not apply to modern high quality converters.
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Joined: Dec 2005
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From: So Cal
2006 Weistec 3.0L SC'd C55, 2006 MaxPsi PT6466 Turbo'd M3, 2019 Maserati GTS , 2020Alfa Quadrifoglio
How many sold?
So do we have a final tally of how many of these LET HSTCs were sold and what the feedback has been?
I really love mine and do notice that I need to Rev it up more than stock form when I leave the light. Thank God I sold my Sprintbooster although I bought a Velocity adjustible one.
One way to find out the difference is to hold the brake down and press the gas pedal until the RPM peaks. In stock form it stops at around 1500rpm. Now mine stops at 2700rpm.
I really love mine and do notice that I need to Rev it up more than stock form when I leave the light. Thank God I sold my Sprintbooster although I bought a Velocity adjustible one.
One way to find out the difference is to hold the brake down and press the gas pedal until the RPM peaks. In stock form it stops at around 1500rpm. Now mine stops at 2700rpm.
Last edited by AMGSC; Feb 22, 2010 at 03:51 PM.
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Super Member
Joined: Jan 2007
Posts: 617
Likes: 1
From: San Diego
MB
I believe this still retains the lockup function so the efficiency shouldn't be affected.
I'd like to know this as well. I'm really interested in what that turbo SRT6 has been up to since it utilizes the same converter.
I.E. how do the trap speeds improve/decrease?
Newbie
Joined: Feb 2009
Posts: 13
Likes: 0
1970 Buick GS 455
What I meant to ask about was efficiency when the convertor is not locked up.
Often times a high stall convertor will slip more while at part throttle or WOT. That is what I am curious about.
As aside note: We discovered on turbo buicks that manually forcing the convertor to lock at WOT was worth about a tenth sec in the 1/4 mi. The tradeoff was shortened convertor clutch life. The aftermarket responded with convertors with improved clutch capacity so that lockup at WOT was no longer an issue.
Often times a high stall convertor will slip more while at part throttle or WOT. That is what I am curious about.
As aside note: We discovered on turbo buicks that manually forcing the convertor to lock at WOT was worth about a tenth sec in the 1/4 mi. The tradeoff was shortened convertor clutch life. The aftermarket responded with convertors with improved clutch capacity so that lockup at WOT was no longer an issue.
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Joined: Feb 2009
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From: Seattle, WA
C55
Double posted but whatever, answers are always good.
So just to clarify, a high stall torque converter, if i'm not mistaken, only lets you stall up to a higher RPM before you launch right?
Which is good for cars with drag slicks/lsd or AWD cars.
Now, for regular street cars like mine thats modded and have a hard time launching it in 1st anyways, I can only imagine that a HSTC would only amplify the problem.
For instance, when I launch my car in 1st gear, I can only give it maybe 20% power initially and then give it about 60% gas near the end of first (with ESP off) and then finally can go WOT after engaging second gear.
If i torque-brake to load the transmission up I spin out even more in 1st. It seems like if I just increase the stall speed on my car it would just amplify the problem.
Wouldn't it be more cost effective to put on a pair of drag slicks to hook up and reduce the ET of a drag run?
OR
Do HSTC also affect how much power the tranny is putting to the ground in addition to raising the stall speed because it is a superior torque converter to the OEM piece?
I think I would have to get an LSD over a HSTC because my 1st gear is essentially useless now after my mods
So just to clarify, a high stall torque converter, if i'm not mistaken, only lets you stall up to a higher RPM before you launch right?
Which is good for cars with drag slicks/lsd or AWD cars.
Now, for regular street cars like mine thats modded and have a hard time launching it in 1st anyways, I can only imagine that a HSTC would only amplify the problem.
For instance, when I launch my car in 1st gear, I can only give it maybe 20% power initially and then give it about 60% gas near the end of first (with ESP off) and then finally can go WOT after engaging second gear.
If i torque-brake to load the transmission up I spin out even more in 1st. It seems like if I just increase the stall speed on my car it would just amplify the problem.
Wouldn't it be more cost effective to put on a pair of drag slicks to hook up and reduce the ET of a drag run?
OR
Do HSTC also affect how much power the tranny is putting to the ground in addition to raising the stall speed because it is a superior torque converter to the OEM piece?
I think I would have to get an LSD over a HSTC because my 1st gear is essentially useless now after my mods
Newbie
Joined: Feb 2009
Posts: 13
Likes: 0
1970 Buick GS 455
I emailed Don at PATC (transmissioncenter.net) and for $350 he will re-stall the convertor to as much as 800 RPM over stock for $350. This does not include shipping and he will need you to send your convertor as he has no cores.
Super Member
Joined: Aug 2009
Posts: 983
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From: USA
Marsaydees
is that all he does? no other upgrades to the converter? do you think that's all LET does to it?
Senior Member
Joined: May 2008
Posts: 340
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From: Indiana
Silver 02 C32 & White 05 CLK500
How can you tell if your torque converter is going out? What are your symptoms? I am just wondering because my car drives like crap with a newish 10k old torque converter.
Super Member
Joined: Jun 2008
Posts: 514
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From: Sarasota
CLK550
When I put the car in gear(drive or reverse) it makes a whining sound almost like a belt slipping. Once I get rolling and give it some gas, the sound goes away. The transmission shifts perfectly smooth, it's just that whining sound everytime the car is standing still and it's in gear.
Super Member
Joined: Aug 2009
Posts: 983
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From: USA
Marsaydees
When I put the car in gear(drive or reverse) it makes a whining sound almost like a belt slipping. Once I get rolling and give it some gas, the sound goes away. The transmission shifts perfectly smooth, it's just that whining sound everytime the car is standing still and it's in gear.
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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
Super Member
Joined: Jun 2008
Posts: 514
Likes: 1
From: Sarasota
CLK550
I had asked one of the guys there if they had to speculate, what they thought might be the problem. They said it might be the torque converter, and to keep an eye on it and see if it starts slipping. There are some times when it doesn't feel as responsive when it gets moving, but nothing real bad yet. Only other trans issue I've had was that I had the drive shaft replaced about a year ago. Like I said though, the car shifts perfectly smooth when driving it.
