[Terry Cooper]

I just installed a new torque convertor, a B&M torkmaster 2400. Now when I put my transmission in gear, my idle drops to 500 rpm. Idle out of gear set at 1100. Converor does not seem to have any slip to it. If I hold the brake and apply throttle, my tires (275X60 15's) break loose at about 1100-1200 rpm. I contacted B&M, and they said it was because my engine is not building enough bottom end torque. Is there a test that can be done to see if a converter is working correctly? There were no marking on this converter, other than the box. It measures 12 inches, and not 11 inches as the Summit catalog stated.

[lnjstreetrods]

Terry,

To check the converter is to power brake it just like you are doing. Torque is a factor in making a converter stall, but it should go up to within a few hundred RPM'S of it's advertised stall, not half as much.

There is one thing to check. Jack the rear wheels up put it in gear at idle and be sure the rear brakes are working, be sure it will stop the wheels from turning, because if they aren't working it will light the rears to soon.

Larry
www.lnjstreetrods.com

[Old School]

I had this same stall and was never happy with it. All I could ever get was 1600 rpm before I had it worked. It might just be the stall. I am a firm believer in you get what you pay for when it comes to stalls after getting my TCI street fighter.

Michael

------------------
My 75 Camaro
383 with AFR's
Old School for life!!

I have the same converter in my car now. I can get it to stall at 1900 - 2000 rpm. I probably could use alot more stall, But its ok for now.

------------------
Tony
<UL TYPE=SQUARE>
<LI>1979 Z-28, 350, Th350- Edelbrock Performer RPM cam and intake, Holley 650, Trick flow twisted wedge heads, dynomax headers,flowmaster american thunder exhuast[/list]http://hobbystage.net/camaro/xodus921/

[Eric68]

The Torquemaster line is not exactly known for being a high quality converter. If you still have the chance I'd return it and get the much better B&M Holeshot converter.

Sounds like a line of BS from B&M to me. That converter should stall within a couple hundred RPM af advertised.

ps. You might also want to check for a vacuum leak (maybe the vacuum modulator line got left off the tranny?). This could make the RPM's drop a bunch when you put it in gear.

[greenham]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Old School:
I had this same stall and was never happy with it. All I could ever get was 1600 rpm before I had it worked. It might just be the stall. I am a firm believer in you get what you pay for when it comes to stalls after getting my TCI street fighter.

Michael

DUMB question.

I see this term "stall used a lot" can someone explain what that actually means.

<HR></BLOCKQUOTE>

[travis]

Sounds to me like you got a towing/economy convertor. The B&M 2400 stall convertors are 11". And like Eric said, the torquemasters are built the way they are priced...cheap. I broke 2 2000 stall torkmasters behind a 305 in a 4000 pound car...and it was making maybe 260-270 hp at best. I have a 2000 stall holeshot in my truck and it will flash 2100 rpms. Try disconnecting the kickdown linkage from the carb, then running down the road in high gear at around 1000-1200 rpms (something well below advertised stall speed), then stomp it and see how how the tach jumps immediately. This will give a better indication of your actual flash stall speed.
From your description, either you got the wrong convertor, or your engine has no torque or tuning issues. What mods are you using?

[Terry Cooper]

thanks for the help, I'll try them out this afternoon to see what I can find out. Low end torque could be an issue, but it still feels fairly strong at he bottom. At same time as convertor change I swithced to Crane #10082 cam. 226 duration at .050, 0470 lift. Very similar to the cam I took out (old cam had several bad lobes). Crane's tech line thought it would work fine with the 2400 convertor, gears, and engine.

[1Fast69chevy]

dont want to be the pessimest here but me and my brother have ballooned one holeshot torque convertor, and the other one slips like 25% atleast its ridiculous. for street car i fig. theyd be fine, but i wouldnt try to pass one off for any car faster than 15s. just my .02

[69 Rat]

Do most of you agree with the previous post that the converter should perform within 200 RPM of advertised stall speed?
A few years ago, I bought a 2800 RPM stall to put behind my near-torqueless 327. It flashed to 3400! I then dropped in a much torquier 427, and it now flashes at 4200!!!

[Eric68]

1fast69chevy,

How did you test / confirm that your converter had ballooned? Same with slip rate, how did you calculate that? I'm not doubting your results, I just replaced my Holeshot 3000 with a Coan thinking the B&M was ballooned but NOBODY could tell me how to test a converter besides cutting it open.

I ran my B&M for 1.5 seasons (like 10k miles and 100+ passes) and it was fine. It was a little looser below stall speed than my Coan, but seemed to hold up fine. I don't think it was really ballooned, I may have jumped the gun replacing it.

[1Fast69chevy]

the way i tested the balooned convertor was i had a shop look at it. Also, the way i came up with 25% was not a scientific number but the fact that after switching to the new one after the old baloon incident, i gained 700rpm in the traps but lost 5 mph id say thats pretty bad slippage. istead of trappin at 5700rpm where i used to and 105ish mph i trapped at 6300-6400rpm and mph was 100ish. it was bad hehe.

rick