Locking up the convertor?????
01-10-2009, 08:27 PM
#1
Locking up the convertor????? You guys with a big cam big stall setup, what are you having your convertor lockup set at. What mile an hour. I have a daily driver beast. 00' C5 with a 408 iron block BIG cam and BIG stall and 3:42 gears out in the rear. My lockup is currently setup at 30 mph. And I hate cam surge. I know I cant eliminate it, but I know that changing the lockup mph can minimize it. So can you guys help me out.???
Thanks,
Thanks,
01-13-2009, 12:03 PM
#5
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Usually takes trial and error though to find what it will take. On big cam cars, don't lock it up in 3rd at all, don't let it go into 4th until about 45 mph and lock the convertor up at around 50 mph in 4th... all of the downshift tables have to be changed as well to get it back out of 4th and unlock it before the bucking starts. The trick is to get all of the values so you don't have any shifts and lock/unlocks fighting each other...
01-13-2009, 12:33 PM
#6
Clutch chatter is a result of having an aftermarket clutch lining (typically Kevlar or some other carbon friction) that is not designed to be pulse lock (rapidly lock and unlock for smooth transition), like the OEM woven composite lining is. Those of you with clutch chatter at low speeds (or any speed really) need to have your tuner or TCC Apply tables modified to have no PWM when the TCC is applied. This is done by setting the Minimum Apply table to 99 and the Maximum Apply table to 100.
Now as for the 30 MPH lock up and cam surge, what is the size of the cam? Typically cam surge is a result of improperly tuned AFR and/or timing at that load point. I can get a 240 cam in an LS1 to not surge at 1200 rpms with light to moderate throttle with enough time. Raising the lock up point will mask the issue and keep it from being annoying. I would suggest upping it to 40-45 mph, without knowing the cam specs.
Now as for the 30 MPH lock up and cam surge, what is the size of the cam? Typically cam surge is a result of improperly tuned AFR and/or timing at that load point. I can get a 240 cam in an LS1 to not surge at 1200 rpms with light to moderate throttle with enough time. Raising the lock up point will mask the issue and keep it from being annoying. I would suggest upping it to 40-45 mph, without knowing the cam specs.
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01-15-2009, 12:04 PM
#8
Clutch chatter is a result of having an aftermarket clutch lining (typically Kevlar or some other carbon friction) that is not designed to be pulse lock (rapidly lock and unlock for smooth transition), like the OEM woven composite lining is. Those of you with clutch chatter at low speeds (or any speed really) need to have your tuner or TCC Apply tables modified to have no PWM when the TCC is applied. This is done by setting the Minimum Apply table to 99 and the Maximum Apply table to 100.
Now as for the 30 MPH lock up and cam surge, what is the size of the cam? Typically cam surge is a result of improperly tuned AFR and/or timing at that load point. I can get a 240 cam in an LS1 to not surge at 1200 rpms with light to moderate throttle with enough time. Raising the lock up point will mask the issue and keep it from being annoying. I would suggest upping it to 40-45 mph, without knowing the cam specs.
Now as for the 30 MPH lock up and cam surge, what is the size of the cam? Typically cam surge is a result of improperly tuned AFR and/or timing at that load point. I can get a 240 cam in an LS1 to not surge at 1200 rpms with light to moderate throttle with enough time. Raising the lock up point will mask the issue and keep it from being annoying. I would suggest upping it to 40-45 mph, without knowing the cam specs.
Its a 272 / 265 cam in a 498ci motor. And a 3500 stall.
01-20-2009, 11:39 AM
#10
I went to ARD, and Owin tweeked the tune a little. OH MY GOD what a difference. The car idles grat. Sounds like its ready to fight. Oh it sounds so good. And we have the convertor set to lock up at 65 mph. Now it drives so much better. Thanks Owin...
