Hello, I bought a 200-4r to fit behind my Procharged 350 SBB. The builder put a 9.5 converter in it. It looks like gears change near the 2500 rpm zone. The pressures are good, the TV cable is correctly set up, the gears go up and down without any problems. There is enough oil in the transmission. My feeling is, compared to my previous stock TH-350, I have to push the throttle further to make the car move...for example when I go out of the garage in reverse, with the TH350 I only had to put a little effort to the pedal, now, with the 200-4r I have to go higher in the rpm to make the car move... I feel the car less comfortable to drive...the gearbox doesn't slip but it feels like I have less torque in low RPM... Where does it come from ? Thanks David
Yup, converter is too loose. It needs to be adjusted. Most good converter builders will adjust the stall once for free.
I do not think this is a problem really it is just something to get used to in most cases. The converter is multiplying torque and increasing the torque to the wheels, but loosing some efficiency at low throttle. More importantly I would ensure the lockup converter is engaging when you are on the highway. And also ensure the converter is not flashing up too high off the line at full throttle.
My car is a street car (pro-touring) not a drag racing one. I have a Procharger on the engine, what would be the best stall for street /curve driving ? Or perhaps does I have to get used to it as you said , Sean...
You do not need to get used it to it. What you describe is not normal. If the car feels lazy coming off a traffic light, the converter is too loose and not efficient enough. The right converter will feel very near normal when driving on the street, the car will be responsive accelerating away from a stop in a normal manner, but jump on it and it will flash up to the "sweet spot" of the motor. That doesn't come cheap. A converter manufacturer will take your specific combination into account when he builds a converter for your car. Car weight, engine torque/HP, gearing all affect converter feel/stall. It isn't a matter of a stall speed number. Picking the best converter out of a catalog is a crap shoot IMHO. You might pick the right one, or you might not. Probably one of the most important factors affecting how you car actually drives and feels, it is no place to cut corners. Give Jim Weise a call. http://www.v8buick.com/index.php?threads/tsp-9-5-street-strip-converters-lifetime-warrantee.147066/
How would a factory d5 gn/ttype converter work in his car? I know it is heavier and a larger diameter than the aftermarket he has. MacBuick I was wondering what your rpm does your current converter flash/stall when you jump on it? allen
It would probably work better than what he has now. How much better, hard to say, but it would probably be tighter. Keep in mind, he is in Belgium.
I used one of those D5 units behind my black skylark 350 engine when it was on the nitrous. It drove great around town very responsive. And it handled 12.9s quarter miles on 100 shot a few times. I then changed the engine to a mild cam 430 street engine and it was great. It was much more responsive down low than my current th350 converter 2500 stall behind 455stg1. Just my 2cents Edit If I remember right, the 2004r also has a lower 1st gear ratio.
The D5 is actually about a 2,200 stall from the factory because of the turbo lag. They came stock in the GN cars. I still have the GN 200-4R trans in mine but I went with a 10", 3,200 stall converter, and honestly, I'm thinking about putting the D5 back in. It really is a great converter and since you are running a procharger I think you would be very happy with it. The 200-4R has a 2.74 1st gear ratio.
you state it is a 9.5" converter but don't note who built it, what it is suppose to stall at and a good question was posed , what does it "flash" to? Lots goes into a "good" converter. That d5 is "made" for a turbo charged v6. That doesn't mean it wont work for the supercharged sbb, but I bet a "custom" converter would work better. plenty of good converter places. Just need to find the one you want to work with and get one for your combo.
