Yank SS or PT converter?
12-03-2006, 10:17 PM
#1
Yank SS or PT converter? Whats the difference between a Yank SS4000 and a PT4000 stall converter? Which one will do better for me? I'm an N/A car full weigh soon to be running a big cam (24x) and heads on my LT1. Later on down the road I plan on spraying a small 100 shot.
I was poking around on Yank's site and in the converter selector section says I sould be running the PT4000. I'm under the (Ported heads, 230+cam and 3.73's).
I was poking around on Yank's site and in the converter selector section says I sould be running the PT4000. I'm under the (Ported heads, 230+cam and 3.73's).
12-04-2006, 01:58 AM
#4
Originally Posted by BarneyMobile
Whats the difference between a Yank SS4000 and a PT4000 stall converter? Which one will do better for me? I'm an N/A car full weigh soon to be running a big cam (24x) and heads on my LT1. Later on down the road I plan on spraying a small 100 shot.
I was poking around on Yank's site and in the converter selector section says I sould be running the PT4000. I'm under the (Ported heads, 230+cam and 3.73's).
I was poking around on Yank's site and in the converter selector section says I sould be running the PT4000. I'm under the (Ported heads, 230+cam and 3.73's).
You will get a much better/accurate answer by calling them.
12-04-2006, 10:11 AM
#5
I've had both of the them in my car.
The SS4000 is a bit tighter feeling and will handle a 150 shot well. For a daily driver, it is easier to deal with if you have a lot of intown driving. You'll use about 300 rpm less under part throttle with SS4000 compared to the YTP 4000.
The YTP 4000 is very loose and has a longer shift extension. It doesn't handle the spray as well unless you shift very high (e.g. 6800), although 100 shot isn't much. I liked this one the better for street racing. It was easier to roll into the throttle on stoplight races and the long shift extension was great for highway burts too. The shift extension is long enough to make a real difference on the 2-3 upshift.
If you were a pure NA performance, a YTP 4200 (had that too
) is my choice. It's the best converter I've driven.
The SS4000 is a bit tighter feeling and will handle a 150 shot well. For a daily driver, it is easier to deal with if you have a lot of intown driving. You'll use about 300 rpm less under part throttle with SS4000 compared to the YTP 4000.
The YTP 4000 is very loose and has a longer shift extension. It doesn't handle the spray as well unless you shift very high (e.g. 6800), although 100 shot isn't much. I liked this one the better for street racing. It was easier to roll into the throttle on stoplight races and the long shift extension was great for highway burts too. The shift extension is long enough to make a real difference on the 2-3 upshift.
If you were a pure NA performance, a YTP 4200 (had that too
) is my choice. It's the best converter I've driven.
12-04-2006, 03:15 PM
#7
I just got off the phone with Yank and they told me the the SS4000 is better for NOS and the PT4000 is best for N/A. I do nt plan on running NOS for another 8 months or so and I dont want to have to order another converter when I install the nos. My main concern is that will the SS4000 be looser and out perform my Fuddle 3200?
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12-04-2006, 08:47 PM
#11
Shift Extension = The point where your RPMs drop down to after the shift. Say if your shift from 2nd ends at 6500, then where the rpms drop down to for 3rd is your shift extension, say 5000. 
With nitrous you can easily over power the transmission more over then what the converter was designed for. This can cause your desired shift point of 6500 rpms, to occur at 6800 rpms. If your limiter is set at 6700 ... guess what, you hit the limiter. By using a different stator design (and/or Impeller/Turbine combo), you can have a converter that will true stall at 4000 rpms, yet transfer better torque from an increased power adder ... or for a tighter feel. Although the lower (tighter 2.4+) Stall Torque Ratio (STR) converters do offer better efficiency over higher (looser -2.2) STR converters.
Sounds like Yank help you make a wise choice.
With nitrous you can easily over power the transmission more over then what the converter was designed for. This can cause your desired shift point of 6500 rpms, to occur at 6800 rpms. If your limiter is set at 6700 ... guess what, you hit the limiter. By using a different stator design (and/or Impeller/Turbine combo), you can have a converter that will true stall at 4000 rpms, yet transfer better torque from an increased power adder ... or for a tighter feel. Although the lower (tighter 2.4+) Stall Torque Ratio (STR) converters do offer better efficiency over higher (looser -2.2) STR converters.
Sounds like Yank help you make a wise choice.
