Saturday, April 25, 2009 - 10:30 pm, by: Ben Ramoss(Ijzzzz)
Is the suprastick able to lock up the converter in 2nd gear? If so how do you tell it to? Mine does not lock up in second. It locks up in 3rd and 4th. At what speed would be ideal to lock up the converter in 3rd and 4th? When the converter locks up, it seems to use up alot of power? Cheers
Saturday, July 04, 2009 - 01:18 pm, by: Khris Cox(Kc95sc400)
With the Suprastick, you can lock the convertor in all gears. It is set by throttle position for 1st and 2nd and by speed for 3rd and 4th. You also need to setup up the min lockup gear for both manual and auto modes.
Ideally, you would want it to lock a good bit after the stall speed of the convertor since tq multiplication is lost otherwise. This is done by setting the stall speed correctly for 1st and 2nd and by speed for 3rd and 4th. I have a 2800rpm stall and have it set to lock at about 60mph in 3rd, it locks at about 3400rpm bringing it back down to about 3200rpm once locked.
Takes some playing around with. I'm still not really happy with my auto shift table for normal driving.
Monday, July 06, 2009 - 02:44 pm, by: Daniel Clarke(Dieseltrain)
Khris, I was told you cannot lockup the convertor in 1st gear due to something in the valve body which prevents enough pressure being applied to lock it up in 1st .
Monday, July 06, 2009 - 07:58 pm, by: Damian Ware(Frozenpod)
Same goes for the JDM V8 trans you cant lock it up in 1st or 2nd.
Given the math I have seen about the lock up I believe pending which torque converter you have the best RPM is about 4000rpm.
Probably not that hard to test on a dyno one with it locked as lower rpm as possible the other 100% unlocked, where the curves intersec is probably the optimal position.
Monday, July 06, 2009 - 09:25 pm, by: Damian Ware(Frozenpod)
US spec V8 trans is the same as the JDM TT trans.
I cant recall the details for that one.
I do remember it can be locked on lower gears than the V8 but again if that was both 1st and 2nd I cant remember.
That being said I cant think of any reason why you would want to lock it in first with the gearing and rate of accelleration the dip as it drops would probably hurt more than leaving it unlocked?
Tuesday, July 07, 2009 - 08:00 am, by: Khris Cox(Kc95sc400)
Now that I think about it, I'm pretty sure it does lock in 1st. I looked at a log of a run at the dragstrip and could see the RPM drop.
I'm talking with the Suprastick just to be clear. My transmission would not lock until 3rd with the stock ECU in control.
In theory, the gear change is faster with the convertor locked. I have in the past turned off 1st gear lock at the track and it seemed to hit the rev limiter a little easier but there could have been other factors.
Previous
