Swift_01_z-28

iTrader: (1)

I am looking at getting a circle d 4C stall. Its supposed to be 3800-4000 speed. I have bolt-ons and will be adding 3.73s at the time of the converter change. I have been doing some reading up on stall torque ratio and I am still undecided on what would be best for me. We like to do a lot of dig racing, but mostly I only get to do short 25mph punches with most people around here. (Lots of slow cars) Anybody got any suggestions?

jimmyblue

iTrader: (11)

There's probably a limited range of available STRs given
the stall speed and diameter you want.

I think you will have zero traction in 1st gear regardless
of what you choose. This is one reason I went with a low
STR on my build (3.42s).

The two things a low STR will give you are a better fluid
coupling at low slip (I cruise at 1500RPM at 30MPH in 3rd,
climb grades at 2000RPM on a 3500/2.0 converter) and a
broader range of torque multiplication. A higher STR has
less RPM between paddlewheeling and fully coupled. In
my opinion a low STR is more street friendly, thrust is
pedal-proportional.

But I don' tknow if this enters into it, 3800+ is not what
I'd pick for the street.

How are you planning to hook up 3.73s and a (say) 2.5:1
multiplication off the line? I've been unable on 3 brands of
regular tire and ET Streets. Spin all through 1st and the
lower half of 2nd, with less gear and less (2.0) STR.

FTICONVERTERS

iTrader: (3)

As Jimmy said a lower str will drive much nicer on the street and most of the time out run a higher str due to traction issues. They will also mutiply torque for a longer period of time. On a bolt on car with a converter change alone you see see a drop in et of .6-.8 tenths in et. The lower str will also run cooler because the coupling phase is so much better. Fluid shear inside the converter is where the heat is made. A 3600 is very driveable with little difference in daily driving but when you whack it look out!!!

Greg

dondb

iTrader: (1)

Is the STR the same for all converter companies? Can the STR be numerically correct by some measuring system? Does, say a Yank 2.0 Str the same as a Vig 2.0 STR, Edge 2.0 STR, Performabuilt 2.0 STR all the same? If it can then one can compare different TQ's by efficancies, if not, a lot of trail and errors can be found before a person can pick whats best for them

performabuilt

iTrader: (25)

In theory doing all the math 3000 stall with a 2,0 str should be the same with any company. This is however not always the case.

01ssreda4

iTrader: (96)

my 3200 with a 2.4 hits hard off the line and i have been fighting traction issues ever since i got it.

cals400ex

iTrader: (27)

the lower str, the better the car will be from a roll in most cases.

Swift_01_z-28

iTrader: (1)

I was planning on going with a 4k stall with a 2.5 str. I was hopin that some 275/40/17 et streets would do the trick to hook, but if that's going to continue to be a problem, seeing as how I already spin like a bitch, I may go 3600 with a 2.0 str. Anybody have any suggestions on where I should get a converter with those specs?

Swift_01_z-28

iTrader: (1)

The yank ss3600 is a 245mm converter with a 2.5 str. They have one that is a 3200, but I only plan on stalling this thing once, unless I go big on it and make it a full out drag car. I'm just wondering if a 3200 would do the trick.

FTICONVERTERS

iTrader: (3)

The converter I mentioned above is a 2.16 str.It is one of our best sellers for DD cars.

Greg