Holeshot converter

[Sixtyeight]

Hi,


I need help choosing the right converter (A/T) for my '67 440. It's totally rebuild and the rpm power range of the camshaft used is 1800 to 4500.

If you need more info on the engine it's here: http://www.charger.nl/engine_specs.htm
Pics of the resto here: http://www.charger.nl/powerplant.htm

I now run a new B&M Holeshot 3000 converter, but it seems to miss its goal, I want very much accelleration power, thats where the choice of the cam came from...now I have a lot of RPM but not enough acceleration...

Thanks in advance

Jeroen.

[firefighter3931]

...now I have a lot of RPM but not enough acceleration.

Sounds like the converter is really "loose". I don't like B&M converters....there are much better choices out there. It's possible you could also have a defective unit. Turbo Action, Dynamic and PTC are excellent converters...it's very rare you hear about any complaints from users of those brands.

One question : what is your rear end ratio and how tall are your tires ?

Ron

Ps. A 2500-2600 converter should be just about perfect with that cam.

[Sixtyeight]

...now I have a lot of RPM but not enough acceleration.

Sounds like the converter is really "loose". I don't like B&M converters....there are much better choices out there. It's possible you could also have a defective unit. Turbo Action, Dynamic and PTC are excellent converters...it's very rare you hear about any complaints from users of those brands.

One question : what is your rear end ratio and how tall are your tires ?

Ron


Ps. A 2500-2600 converter should be just about perfect with that cam.

Thanks, the rearend ratio is 3:23 tires are 295/50/15

Jeroen.

[firefighter3931]

Jeroen, the reason i asked about the gears and tire diameter is that often small gears and big tires will compound the problem with a converter that's "too loose" for the application. Your gearing is fine for the cam and the rest of the engine build, and the tire diameter isn't taking a lot of ratio out of final drive. A PTC 11in or Turbo Action 11in "street hemi" converter would be a good match, inmo.

Ron

[Sixtyeight]

Thanks for the advise!

One question though...what about the holeshot 2400? It stalls at 2300-2500 RPM
Or the holeshot 2000 is 1900-2100 RPM

Just curious

Jeroen.

[firefighter3931]

The Holeshot 2400 would be closer to what you need...but it's still a B&M product 

The PTC 11in is only $250.00 which is excellent value for the dollar. I plan to run one of those on my 70 6-pack car when i upgrade the engine combo. 

Ron

[Sixtyeight]

I don't know much about converters,

can u please explain me what exactly is the difference between the PTC & B&M converters?
And the PTC 11 that u mentioned, what stall does it have?

Thanks,

Jeroen.

[firefighter3931]

I don't know much about converters,

can u please explain me what exactly is the difference between the PTC & B&M converters?
And the PTC 11 that u mentioned, what stall does it have?

Thanks,

Jeroen.

Jeroen, converters come in different quality levels....just like any other speed part. There's the average stuff (B&M) and there's the above average stuff (PTC).

Basicly a converter is designed to transmit torque thru the engine into the transmission...this we all know. The more efficiently this power is transmitted, the better the car will feel. Converters that are designed to be loose will feel soft when being driven at slower speeds (B&M). As you pull away from a stop it revs up and slowly moves as engine speed climbs....this is an inefficient converter. What you want is a converter that is tight at low engine speeds and feels like a stock converter, yet flashes up to the stall speed when you floor the car....this is an efficient converter (PTC).

Cope Racing Transmissions carries the PTC line. Call and talk with John and ask about the 11in converter. It will stall in the 2500-2700 range on your car approx.

http://www.coperacingtrans.com/727.htm


Ron

[Sixtyeight]

I also picked something up from a positive and negative blade angle setup...

Can you tell me something about that, concerning B&M and PTC?

Jeroen.

[firefighter3931]

I also picked something up from a positive and negative blade angle setup...

Can you tell me something about that, concerning B&M and PTC?

Jeroen.

The blade/fin angle is what determines how the converter will behave. As far as + vs - angle, i'm not sure how that impacts on the actual stall speed. A tech at one of the manufacturers could answer that question better than i could.  I will say that the B&M converters are not known for their efficiency and that's a design issue....whether it be positive or negative fin angle. The lower grade converters are also known for bent fins which cause the converter to perform inadequately. It could be a manufacturing deficiency (weak metal) or an assembly issue (poor welding/workmanship). You get what you pay for in converters soit pays to buy a good one in the first place.

Fwiw, a buddy of mine who's much more knowledgable on the subject did an autopsy on a low grade converter ( either B&M or GER...can't remember which off hand) and he was not impressed with the materials or the welding. Some of the fins were bent and the welds looked weak....

Ron

[Sixtyeight]

Hi,

Does anyone has some experience with a TCI 2400-2600 141200 breakaway Converter?

Jeroen

[dodge freak]

Yeah I had one-it was ok but I lost some top end speed, after 2 years trany fluid started pissing out the vent hole like it was over filled but it wasn't. The converter went bad, my trans guy said it over the phone -well he said its either the seal or converter and I bet its the converter. I did not believe him so I just changed the seal, nope -out the trans went again and put in a $60 police converter he got me. The stall was not as much but it has more top end speed, only 5 mph or so but it help.

I think that 10 B & M converter needed more cam, like a 230-240 @ .050 and more gearing 3.55 - 3.91

[deputycrawford]

From what I have learned, the B&M converter gets some of its stall by bending the fins. That creates an inefficient converter. My Dynamic is smaller and has positive fin angle. It leaves a light around 2000 rpms. When I flash it, I get the 3500 stall I want. I is hand built and cost me over $600. You do get what you pay for. I did run a 10 inch 2800-3000 TCI converter and it was pretty efficient for its price. I would use one again if the need arises.

[Sixtyeight]

yes deputy,

you're right about the fins, i've seen it! That's why I will never use a B&M again.
Will install the TCI over 2 weeks, I think it will bring me a lot more!

Thanks!

Jeroen.

[andy74]

i had a tci convertor,2 years and 7000 miles it shit the bed,taking out my tranny at the same time,spend the $$ for a good quality one,instead of 2 average quality ones and a tranny rebuild

[BigBlockSam]

Hi,

Does anyone has some experience with a TCI 2400-2600 141200 breakaway Converter?

Jeroen 

yea, i run one in my rod for years. i've had no problems and i run a tci trans with that . excellent combo. Rene