| 1993 Transmission TCC issue? |
Subject: 1993 Transmission TCC issue? by Steve40th on 2022/6/29 14:35:25 1993 Corvette, 396LT1 A4 2800 rpm converter Vigilante , 42# injectors, 3.75 gears, long tubes, heated O2 sensors. Runs great, with the exception of cruising at about 1800 rpm , plus or minus 200rpm, in OD.. It seems to buck a little, like a little surging, causing the driveline to slap, like hearing u joints are broke. U Joints are new, driveline is solid with D44, Ikerds diff, and I cant move any of the half shafts or driveshaft by hand when in the air. If I drop a gear, to 3rd it all goes away, even when I get in same rpm. Maybe not as pronounced due to speed, but I cant hear it So, in tuning, what parameters can assist a barely above idle/throttle to keep car from bucking/surging a little. TCC speeds for lock up and unlock. Right now its as follows. TCC is lock 47mph low 42mph Unlock low gears TCC lock high gears 56mph TCC unlock high gears 42 TCC unlock prevention speed threshold is 64 Can I have a large spread on the lock vs unlock speeds, ie 60 lock and 40 unlock? I am going to do some TTS Datamaster files to see if electronically the ecm is unlocking and locking today. If not, it must be surging from cam. Not small, Gross Valve Lift: 510 I 520E 1.5RR Installed at 108 Intake Centerline +4 Duration at .050 230 I 236 E Lobe Lift .3400 I 3470E Lobe Separation 112 Duration at .006 Tappet Lift 281 I 288 exh I have 1.655 Roller Rockers too.. Comp Cams Part # 07-000-9 Engine :LT1/LT4 |
