Need some advice on High Stall Converter, what do you guys have on your cars? What kind of numbers does it produce? What do you guys recommend? Worth it?........I'm listening, thanks.
No, but you can call SP and ask Larry. I believe supratt96 has instructions as well if you can find him. Chris at PM in Austin did mine and he probably knows as well. His handle is PM supra.swamibob said:Supreme, do you know of anywhere on the net that tells you how to wire in the lockup switch?
Also, did you say you lock your's in near the end of 2nd or right after it shifts into 3rd?
Well, asuming you could pull a 1.8-2.0 60' without the converter, I think a 1.6 60' is definitely within reason with one. That's going to end up being about 4-6 1/10ths at the end of the 1/4 as long as you can lock it up.KJSUPRA said:If your running in the mid 12's with a BPU automatic Supra, what would a high stall converter drop that to on average?
Well, before I answer this I will first emphasize that a 4000rpm stall is VERY streetable on a MKIV.Spool said:What about a 2800 stall...Ryan H pulled a 12.08 at pomona with this stall.
This may be more streetable...meaning the ability to launch well and actually *hook* with street tires. Not sure if the tires will blow up on even light gas, stalled launches with a 3800 stall?
Let me know what you think.
This is impossible to say as it depends on so many other variables like tires, traction, track condition, driver, etc. Drag performance will continue to improve as your stall nears the optimum stall speed usually up to 400rpm below peak TQ. As to whether the improvement is linear or exponential, I do not know. I don't think anyone has tested enough stall speeds, especially on a MKIV, to demonstarte the improvments of raising your stall speed "x" amount. I do not know much about road courses as I have never been on one in this car. I also do not know the affects of converters on road courses. This is a tricky set of questions as it is extremely difficult to set a car up for both road racing and drag racing properly.Spool said:I guess I wasn't clear enough about the question...
How much would you improve both drag & road coarse performance with a higher than stock stall:
1. From Stock 2200 to 2800
2. From 2800 to 3800
Better street launches will be obtained, assuming you have traction, with a higher stall converter. As to whether the benefits offset the penalty for road racing, and as to at what stall speed the best compromise would take place, I don't think I can answer that. I'm not even sure that 3800 would be too high for road racing to begin with. I just don't know enough about the technical aspects of of where you would want TQ multiplied on a road course and how much would be too much. It may even vary between road courses.
So trying to solve two requirements:
1. Better Street racing launches....may need to get some DR's on full time but concerned about slickness in the rain/etc. Don't want too high of stall if the benefits do not offset the penalty to road racing/street/mountiain lower speed cornering.
2. Road racing - torque converters can help increase power on the road course in low speed cornering. However, too high of a stall may not be good??
3. So, in your opinion, would a lower than the "optimal" stall for drags be more suitable for my requirements?
jc said:I have a 2800rpm art carr converter and it works fine
for me on the street. I think that a 3000rpm one
would work better for me since the trust fmic gave
me a little more lag.