Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
Sponsored by:
Sponsored by:

Boosted Th400 guys chime in...

Thread Tools
 
Search this Thread
 
Old Nov 19, 2014 | 10:02 PM
  #1  
chevrolade's Avatar
Thread Starter
TECH Fanatic
iTrader: (21)
 
Joined: Sep 2007
Posts: 1,448
Likes: 0
From: pearsall.tx
Exclamation Boosted Th400 guys chime in...

I'd like for U guys to post up what torque converter you are running and how u like it? I'm lookin for recommendation for my setup
Going to be twins th400 3:27 gear
Just want to know who makes a good reliable converter for the th400
Reply
Old Nov 20, 2014 | 08:30 AM
  #2  
chevrolade's Avatar
Thread Starter
TECH Fanatic
iTrader: (21)
 
Joined: Sep 2007
Posts: 1,448
Likes: 0
From: pearsall.tx
Default

Bump .....
Reply
Old Nov 20, 2014 | 12:11 PM
  #3  
Go On 3's Avatar
11 Second Club
iTrader: (2)
 
Joined: Oct 2010
Posts: 195
Likes: 0
From: Ohio
Default

ive been doing alot of research the past week for my build,(370ci, s476, th400) and ive narrowed it down to yank and ptc. Yank because ive had great luck with them in the past and they never let me down and PTC because they come highly recommended for the boosted/th400 setups. just my 2cents, post up what you end up going with
Reply
Old Nov 20, 2014 | 12:47 PM
  #4  
Circle-D_Brian's Avatar
FormerVendor
 
Joined: Jan 2014
Posts: 323
Likes: 3
Default

Whatever you wind up going with, I would choose one with a billet front cover. This (should) give you fitment without spacers or pilot adapters for an LS motor/flex plate, and keep the converter pads from breaking off. Seen this numerous times on the Janky home made types

-Brian
Reply
Old Nov 20, 2014 | 03:06 PM
  #5  
chevrolade's Avatar
Thread Starter
TECH Fanatic
iTrader: (21)
 
Joined: Sep 2007
Posts: 1,448
Likes: 0
From: pearsall.tx
Default

Thanks yea I'm trying to find the ideal stall size right now

Hey Brian I'm actually messaging with one of yall on FB lol I'll be going with a CircleD for sure just don't know what size stall rate to go with

I don't want to blow through it....
Reply
Old Nov 21, 2014 | 10:47 AM
  #6  
Circle-D_Brian's Avatar
FormerVendor
 
Joined: Jan 2014
Posts: 323
Likes: 3
Default

Great to hear. Chris will get you set up with what you need. We love the turbo setups. Challenging to spec, but when it's right, it's very rewarding.

-Brian
Reply
Old Nov 21, 2014 | 01:10 PM
  #7  
CGCBandit's Avatar
Launching!
 
Joined: Jan 2005
Posts: 289
Likes: 7
From: Richmond VA
Default

Call Greg at FTI
Reply
Old Nov 21, 2014 | 01:32 PM
  #8  
SLOW SEDAN's Avatar
8 Second Club
iTrader: (13)
 
Joined: Jan 2010
Posts: 4,025
Likes: 952
From: No VA
Default

What general power range are the Circle-D converters rated at? I tried one last time I did a TH400 and my 4C flashed over 5k RPM, sent it back and came back as a 2C and still flashed over 4k RPM. Ended up just taking it out as I felt I was losing out on some powerband. An OEM truck converter ended up working well and jumped off the line about 2500-2800RPM. I'm considering it again but are there tighter converters for turbos that are making boost around 3k RPM and 20+PSI by 3,700 RPM.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Nov 21, 2014 | 03:57 PM
  #9  
Circle-D_Brian's Avatar
FormerVendor
 
Joined: Jan 2014
Posts: 323
Likes: 3
Default

Originally Posted by SLOW SEDAN
What general power range are the Circle-D converters rated at? I tried one last time I did a TH400 and my 4C flashed over 5k RPM, sent it back and came back as a 2C and still flashed over 4k RPM. Ended up just taking it out as I felt I was losing out on some powerband. An OEM truck converter ended up working well and jumped off the line about 2500-2800RPM. I'm considering it again but are there tighter converters for turbos that are making boost around 3k RPM and 20+PSI by 3,700 RPM.
Our general ratings for converter stall speed are based on a N/A 4-500 hp car. This seems to be what most guys are looking for when they contact us. I definitely would have at least put you in the 10 1/4" 258mm for any sort of serious turbo setup. We reserve the 245mm for centrifugal, N/A, and nitrous applications.

-Brian
Reply
Old Nov 22, 2014 | 01:22 PM
  #10  
Mike 02T/A's Avatar
11 Second Club
iTrader: (28)
 
Joined: Jul 2004
Posts: 398
Likes: 0
From: FL
Default

Another +1 for FTI. I'm in Florida, so that made my decision alot easier. Everything is working great, FTI th400 level 4.5/converter.
Reply
Old Nov 22, 2014 | 02:12 PM
  #11  
dezlfrek's Avatar
TECH Apprentice
iTrader: (1)
 
Joined: Oct 2013
Posts: 309
Likes: 0
From: sonoma ca
Default

happy with my 9.5 inch ptc.. I feel they nailed it for my combo..
Reply
Old Nov 24, 2014 | 09:24 PM
  #12  
boss79z's Avatar
TECH Apprentice
iTrader: (1)
 
Joined: Dec 2007
Posts: 396
Likes: 2
Default

Very happy with my billet converter from circle d. Got to send it back to them for a re stall. New setup will make quite a but more power then the last.
Reply
Old Nov 26, 2014 | 02:51 PM
  #13  
SLOW SEDAN's Avatar
8 Second Club
iTrader: (13)
 
Joined: Jan 2010
Posts: 4,025
Likes: 952
From: No VA
Default

Originally Posted by Circle-D_Brian
Our general ratings for converter stall speed are based on a N/A 4-500 hp car. This seems to be what most guys are looking for when they contact us. I definitely would have at least put you in the 10 1/4" 258mm for any sort of serious turbo setup. We reserve the 245mm for centrifugal, N/A, and nitrous applications.

-Brian
Thanks that makes sense, I guess something got lost in translation. I'll give you a shout when I get the new trans setup figured out.
Reply
Old Dec 3, 2014 | 07:07 AM
  #14  
lsx2000z28's Avatar
On The Tree
iTrader: (4)
 
Joined: May 2009
Posts: 131
Likes: 0
From: harison
Default

17 pitch ptc, with a little highguard and loving it
Reply
Old Dec 3, 2014 | 07:16 AM
  #15  
Mean87SS's Avatar
10 Second Club
iTrader: (21)
 
Joined: Sep 2005
Posts: 1,407
Likes: 2
From: Edison, NJ
Default

I always run PTC setups...
Reply




All times are GMT -5. The time now is 11:15 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE