Hallucinating..... wondering if it would be possible.... seems like about 200-300 RPM before it would shift into second... if the converter could lock... pull the engine back down ...start building RPM's again....until RPM's got high enough.... then at every shift point... there wouldn't be too steep a RPM drop..... looks like it would really haul @ss...
Anyway to lock converter in 1st?
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Lee Thompson
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I don't believe
a convertor can multiply torque when locked. Maybe that is why the prefered method is to lock them @ the top of third.
a convertor can multiply torque when locked. Maybe that is why the prefered method is to lock them @ the top of third.
jurassic five 7
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NO! With the 2004r trans, the TCC will not lock up in 1st gear, EVER.
I had assumed that the pressure switches inside the tranny is what kept the transmission from locking until it went to second..... I am sure those could be temporarily defeated with some wiring.... yet still give the proper signals to the ECM to let it know what gear the tranny was in....
Like I said.... hallucinating...
The only electrical part in a stock 200 R4 is the lock up solenoid for the converter. A TR ECM only knows what gear the car is in by the neutral safety switch position.
Lee Thompson
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What about those 2 or 3 pressure switches inside....what are they for then...
mikestertwo
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The hydraulic circuits in the trans are designed so the converter cannot be locked in first. The pressure switches in the trans have nothing to do with it not locking in 1st. The switches are there to control converter lockup in 3rd and 4th along with boost and timing among other things. :smile:
Maybe it is hydraulically impossible... I had a misconception that the pressure switches in the tranny were "in-line" with either the power or ground... therefore preventing the TCC from applying.
So if I understand this..... you would have to supply the TCC fluid passage with pressurized fluid... in 1st gear... then apply the solenoid.
The ECM does see the switches... cause the DS shows if you are in 3rd or 4th.... the neutral safety switch has nothing to do with that....
So if I understand this..... you would have to supply the TCC fluid passage with pressurized fluid... in 1st gear... then apply the solenoid.
The ECM does see the switches... cause the DS shows if you are in 3rd or 4th.... the neutral safety switch has nothing to do with that....
Anyway to lock converter in 1st?
YES! (but, not for a do it yourselfer) It would be done after the car is launched.
We have had a special request or two, I hate to say.
Some guys want every last hundreth of a second. Mainly for low stall Chevy guys.
It can be done, but IS NOT good for (as already mentioned) longevity of hardparts!
Brian
YES! (but, not for a do it yourselfer) It would be done after the car is launched.
We have had a special request or two, I hate to say.
Some guys want every last hundreth of a second. Mainly for low stall Chevy guys. It can be done, but IS NOT good for (as already mentioned) longevity of hardparts!
Brian
Also, after rereading your post, I will offer this.
My partner has thought about and talked about a "gear splitter" to accomplish what you are saying. So the car would stay more in the powerband and not drop so much on gear changes.
I know this may sound crazy, just something he has always threatened to do if he had time.:tongue: This would function similar to the way Gear Vendors has said about using their OD unit for doing this.
At some point you are trading torque multiplication for efficiency. My thinking was.... In your case.... you lock at high gear at 5800 or so (from memory)... motor pulls back down and starts gaining RPM again....then you go through the traps...
In my experience... if I locked mine in second... say half way through.. it felt like I hit a nitrous kit (I realize my car at that time was only a mid 12 sec car)....at least on the butt dyno... it seemed to pick up alot when locked....
The problem with leaving the "switch" on where it can lock when it goes into second.... as the 1-2 gear change goes from an unlocked 1st gear to a locked second gear.... it is a mismatch to say the least.
My thought was to do just what you did Lee.... except do it 2-3 hundred RPM prior to the 1-2 shift....then when it did shift on the 1-2 ... it would only be dropping from a locked 1st to a locked 2nd gear....
God Bless the tranny parts.
