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Old 05-28-2003, 02:44 PM   #41
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Quote:
Originally Posted by bonnie94sse
That sounds interesting. Never heard of the "transmission lockup point". Could be the problem. I'll do what you said and see what happens. Thanks.
Well, I wouldn't call it a "problem" really; it'* what we in Tech Support call a "WAD" (Works as Designed).

47-48mph is the minimum point where the ECM allows the Torque Converter Clutch solenoid to lock the engine to the final drive and bypass the transmission'* torque convertor, which eliminates the normal slight slippage of the convertor and locks the engine directly to the drivetrain. (This is why, when the TCC solenoid gets stuck, the engine stalls when you come to a stop at the end of the expressway exit ramp or a stop sign, but restarts immediately when you put it in Park or Neutral.)

After lockup occurs, your RPMs will drop way down, so getting on the gas at that instant might feel kind of boggy as the ECM tries to decide whether to kick down out of lockup or just accelerate through it. Load factors determine what it should do -- gas pedal position, manifold vacuum (how much load the engine'* already got -- uphill, heavy load, etc.) -- and it'll either kick down for fast acceleration, or hold in lockup and look for boost from the supercharger.

I remember once on vacation after we crossed the Mississippi and started climbing uphill on the interstate at 80mph+ with a full load of people and luggage. I watched the supercharger boost gauge winding clockwise under cruise control and the car didn't miss a beat. We just sailed uphill past everybody else...
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Old 05-28-2003, 08:05 PM   #42
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The scantool will SHOW you instead of feeling it. It really is worth it. That was the single best 'mod' I spent money on. Easily.
What make and model do you recommend. Auto Tap ?

I only have a code reader that is also capable of clearing codes and SES light.
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Old 05-28-2003, 08:12 PM   #43
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Yeah as soon as I get some more dough I'll get one. Thanks for the hook up Will.
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Old 05-29-2003, 12:47 AM   #44
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my riv must be different in some way compared to the Bonneville'*. the torque converter lockup is very noticable and is at around 40 MPH (or maybe it'* shifting into OD, I'm not sure. After it locks up it has a little bit of a shudder to it under acceleration. Also, at 40 MPH the car will shift into OD and loaf at 900 RPM! at 55 RPM it is only at 1,300 RPM. That seems low to me. I've never driven a car that was at below 1,000 RPM at 40 MPH. Now is this normal? lol. the gears shift as follows under 'normal' acceleration:
1-2=20 MPH
2-3=35MPH
3-OD=40
Torque converter lockup=45
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Old 05-30-2003, 12:12 AM   #45
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Quote:
Originally Posted by jr's3800
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Originally Posted by Custom88
my riv must be different in some way compared to the Bonneville'*. the torque converter lockup is very noticable and is at around 40 MPH (or maybe it'* shifting into OD, I'm not sure. After it locks up it has a little bit of a shudder to it under acceleration. Also, at 40 MPH the car will shift into OD and loaf at 900 RPM! at 55 RPM it is only at 1,300 RPM. That seems low to me. I've never driven a car that was at below 1,000 RPM at 40 MPH. Now is this normal? lol. the gears shift as follows under 'normal' acceleration:
1-2=20 MPH
2-3=35MPH
3-OD=40
Torque converter lockup=45
Somethings wrong with all of this... I think your tach is way off... If you hit OD at a true 900 rpms underload you car will most likely buck, kick and stumble like mad... And at 55 mph you should be at about 1500-1600 rpm'*... Anything less than 1400 rpms or so would be a bit too low and lug the engine..... I think a scan tool would tell for sure..
guess I'll have to get that checked out. :( It doesn't seem to be off. when the car is gunned it shifts exactly when the tach gets to the red zone, not that it means anything of course. Maybe we can tell by the idle. lol. When the engine is totally warm it idles at 750 RPM.
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