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Old 09-19-08, 09:40 PM   #16
KC95SC400
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Answering questions. Again, this applies to my 95, I can't speak for other years. I would think that everything is the same for at least 95 and under SC400's. 96 and up obdII cars are likely a different ball game altogether.

Quote:
Originally Posted by RedPhoenix View Post
Where on the tranny is the sensor located. Im thinking about trying it.
Driver's side, on the side of the trans case directly after the bellhousing.

Quote:
Originally Posted by IS_250
Now, i've got a question? Is it possible to wire a switch to the solenoid so you can swith between a smooth shift and a harder shift?

Maybe even wire into the ECT/PWR switch?
I don't see any reason why you couldn't put a switch on it, I've even thought about doing it myself.

No, I don't think you could wire it to the ECT/PWR switch. There is 12volts going to the switch anytime the ignition is on. Turning the switch to PWR mode sends the 12 volts to the ECU pin 18 and to the indicator light in the cluster. Wiring the solenoid to the switch would allow 12volts to go to the cluster light, the ECU pin 18, the ECU pin 13 (for solenoid 4) and to the solenoid itself which is normally controlled with pulse width modulation. Good chance of frying something.

Quote:
Originally Posted by 93MSB
I did a bit of skimming through the 95 supra manual. I found that the a340e (2jzge version) only has 3 solenoids solenoid1, solenoid2, and a lock up solenoid. It also does not have the overdrive clutch speed sensor. So the particular method you described will not work for the sc300.

I also took a look at the 2jzgte version of the a340e found in the supra turbos. It has 5 solenoids, 1-4 have the same operations as the 1uzfe and the 5th one is to control line pressure

im going to read more in depth about the 2jzge version of the a340e to see what i can find.

ill be happy to email you the .pdf's for the a340e if you want to have a look at it
I do remember reading somewhere that the SC300 stayed with a mostly manually controlled trans until 97 or 98.

I find it interesting that the 2jzgte trans has 5 solenoids. Seems redundent to have the accumulator bleed off solenoid when the ECU has full contorl over line pressure anyway.

I have access to TIS but definately feel free to post stuff here for the benefit of others.

Quote:
Originally Posted by andrewwake
so will overdrive/od button still work?
Yes. Same goes for tq clutch lock up, trac control, abs ect. I don't have the cruise hooked up on my car but I'd bet it would be fine as well.

Quote:
Originally Posted by 5sp_jzz30
my buddy did a similar thing on his altima. the transmission didnt like it and started to shift like crap. we had to do a full fluid flush about 3 times to bring it back to stock. maybe our trans is different but the saying is "you cant have the cake and eat it too" there are always downfalls with all positives.

i dont have to worry about this problem though
I do understand the concern...but I think the a340x is a different animal. The only purpose of the no 4 solenoid is to bleed off line pressure during a shift for a smooth shift and to prevent squat. Think about this for a second, what happens when any transmission shifts smoothly......it's slipping. The smoother any given trans shifts, the more it's slipping. As far as preventing vehicle squat, the solenoid is causing enough slip to reduce power to the wheels to keep the car level on take off for a luxury, not sporty feel.

-----------------------------------------------------------------------

Now on my car I have been running quite a while, including 70+ track runs, with about twice the stock power on the trans and haven't had any problems other than bouncing off the rev limiter during the 1-2 shift at WOT. Also keep in mind that I have .525 inch of shim in both the 1-2 and 2-3 accumulators. AND...I have adjusted the main pressure regulator to up line pressure. I'm still considering adding MORE shims. It definately shifts firmer but could be better.

So, someone with a stock car would probably not see as much of a difference as I have by disabling the solenoid. But, it has made quite a difference. Even with twice stock power and a 2800rpm dragon, I still felt like the car was a bit weak on take off and when downshifting. Now, the car squats like freakin crazy, it actually feels like a high powered sports car.

To go over a few things again. Unplugging the od speed sensor will not hurt anything but it WILL make the overdrive light on the dash blink and there will be a trans code, 67. Cutting the solenoid wire WILL NOT make the overdrive light flash but there will be a trans code in memory, 46. Benefits. You will have more power off the line and when downshifting due to the fact that the ECU is not making the trans slip to REDUCE power. All shifts will be firmer during all driving conditions.

KC
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Old 09-19-08, 10:35 PM   #17
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Use the 12v signal from the ECT/PWR switch to energize a single pole double throw relay(SPDT). This will disconnect the tranny wire when the PWR switch is on, and reconnect the tranny wire when the switch is off.

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Old 09-20-08, 06:18 AM   #18
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Quote:
Originally Posted by t42gs3 View Post
Use the 12v signal from the ECT/PWR switch to energize a single pole double throw relay(SPDT). This will disconnect the tranny wire when the PWR switch is on, and reconnect the tranny wire when the switch is off.
Awesome idea! Very smart.

Has anyone tried unplugging the od speed sensor yet? I'm very curious to hear what difference is felt on a otherwise stock, or slightly modded car.

KC
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Old 09-20-08, 07:54 AM   #19
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Wow KC, this sounds like it may have some promise to the SCguys. Cutting edge stuff, I got to see how this turns out.
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Old 09-20-08, 11:28 AM   #20
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hey im willing to try this. kc can you pls take a picture of where its located. my trans slips pretty bad into 2nd. will i need any tools etc.?
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Old 09-20-08, 12:41 PM   #21
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Quote:
Originally Posted by 818sc400 View Post
hey im willing to try this. kc can you pls take a picture of where its located. my trans slips pretty bad into 2nd. will i need any tools etc.?
I wouldn't be able to take a pic until at least Monday but it's easy to find. Attatched is a pic that will help. No tools needed, just unplug it and make sure the loose wire won't hit anything hot.

I'm not sure this will help you much if your trans is slipping, but it shouldn't hurt any.

KC
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File Type: pdf odvss.pdf (93.0 KB, 656 views)
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Old 09-21-08, 01:00 AM   #22
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it only slips if i floor it from a dead stop. if im jus driving normal or spirited it doesnt slip at all. but ya pm me the pic or post it all ill give it a try
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Old 09-22-08, 05:42 PM   #23
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so no one know if this trick will work in the 96+ sc4's?
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Old 09-22-08, 09:30 PM   #24
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So, has anyone tried it yet? I'm real curious to know...........

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Originally Posted by 818sc400 View Post
it only slips if i floor it from a dead stop. if im jus driving normal or spirited it doesnt slip at all. but ya pm me the pic or post it all ill give it a try

Check post 21 for the attatched PFD, it's easy to find and unplug the sensor. I don't know for sure that it's the same on a 97 though.

Quote:
Originally Posted by OneSickSC
so no one know if this trick will work in the 96+ sc4's?
I don't know, I'll have to look into it for you. I'm pretty sure it's the same trans until 98 but not 100%. Do you know which trans you have? If you look at the sticker that's on the driver's side door area, it will say what trans you have.

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Old 09-22-08, 09:36 PM   #25
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wonder if it works on LS400s....
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Old 09-22-08, 09:40 PM   #26
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Quote:
Originally Posted by KC95SC400 View Post

I don't know, I'll have to look into it for you. I'm pretty sure it's the same trans until 98 but not 100%. Do you know which trans you have? If you look at the sticker that's on the driver's side door area, it will say what trans you have.

KC

ok cool lmk....i checked my door it didnt say wat tranny i had.....any other ways to find out?......
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Old 09-23-08, 06:55 AM   #27
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Originally Posted by OneSickSC View Post
ok cool lmk....i checked my door it didnt say wat tranny i had.....any other ways to find out?......
The sticker should be on the door, same sticker that has the vin and the color / trim code info. It will say A/T ****/*****.

I'll check what it says on TIS. I'm kind of interested if a 97 tranny would work in my car anyway.

KC
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Old 09-23-08, 08:19 PM   #28
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Quote:
Originally Posted by KC95SC400 View Post
The sticker should be on the door, same sticker that has the vin and the color / trim code info. It will say A/T ****/*****.

I'll check what it says on TIS. I'm kind of interested if a 97 tranny would work in my car anyway.

KC
that sticker isnt onmy car maybe previous owner took it off......well i did that trick to my car....dont know if its mind over matter but i feel a BIG TQ difference......car squats and actually wiggles from a dead stop lol.....
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Old 09-23-08, 10:28 PM   #29
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I am really tempted to try this but will I get a check engine light or is it only the O/D light? (If I just disconnect the wire)

Thanks
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Old 09-23-08, 10:58 PM   #30
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KC, this is some cool stuff!! I am excited that you are paving new ground to find both economical and definitive mods to the auto tranny to improve performance. I look forward to your progress.

I will experiment with some of this as well. I will have somewhat of a different challenge though. Since my tranny has been modded by BL, I will get the specific changes in detail that they made, and since I am no longer using the stock tranny ecu, but the PCS tranny ECU, I am curious how far we can go with managing shifts electronically. I discussed this with PCS on a cursory level, but once I get the car back next week, it will be ready for connecting both ECU's and tuning them to optimum performance. I do know that I can control and manage shifts based upon a combination of engine load, rpm's and boost. But, i do not yet know all of the details and how granular we can go. I do know that I should be able to fine tune shifting with this combination. Plus, with adding e-shift, that wil also add a whole new dynamic to the SC.

I do know that the weakest link seems to be with the second gear sprag with these trannmissions, so, I am working on tuning to protect that during hard driving and shifting.

I hope my comments are not hijacking your thread here. My purpose is to emmulate what you're doing as much as I can with my modifications and to see what positive and negative effects I end up with.

I do know that the line pressure has been increased and the spring rate has been stiffened as well. It will be interesting to see how much difference will be noticeable between the two transmissions, especially since both yours and mine have the Dragon TQ convertor.

Ryan
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Old 09-23-08, 10:58 PM
 
 
 
 
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1995, 94, a340e, a342e, automatic, downshift, es300, flashing, lexus, light, od, p0715, ranger, sensor, speed, toyota, transmission

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