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post #1 of 11 (permalink) Old 10-23-2013, 04:48 PM Thread Starter
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Bypass Clutch Control Valve Question

Hey, my tranny went out a few years ago. It was rebuilt with a "bypass clutch control valve" because they couldn't get the converter to lock up. This bypass valve enables the tranny to shift itself without the computer telling it to correct? Reason I ask is the car was dyno'd using XCal2 before the tranny was rebuilt. The tuner couldn't get converter to lock and eventually the transmission took a crap, and I got it rebuilt with the bypass valve

I was messing with some parameters on the xcal2 a week ago but didn't change anything but still had to re-upload the tune Will converter still lock up, even after I re-uploaded old tune that wouldn't lock converter in the first place? Also, if I do more mods and get it re-tuned again or change some parameters on the Xcal2, is it going to cause the tranny to take a crap again? I didn't think it would because that's what the bypass clutch control valve is for isn't it? to bypass the computer system that would normally tell the tranny when to shift?

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post #2 of 11 (permalink) Old 10-24-2013, 09:24 AM
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Question

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Originally Posted by BlakTbird96 View Post
Hey, my tranny went out a few years ago. It was rebuilt with a "bypass clutch control valve" because they couldn't get the converter to lock up. This bypass valve enables the tranny to shift itself without the computer telling it to correct?? I didn't think it would because that's what the bypass clutch control valve is for isn't it? to bypass the computer system that would normally tell the tranny when to shift? thanks
First of all... your Stock Main VB CAME with a "bypass clutch control valve".

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- What the heck does Bypass Clutch Control Valve in the Main VB do anyway _______?

- I used the black Sonnax Solenoid Pressure Regulator Valve from 2001 VB but used the heavier 96 Spring vice the TEENY Sonnax Spring from the 2001 VB... & by teeny I mean it slipped over the small tit on the PR Valve vice bearing on the flat "lands" like all the other Springs do in the like PR Valves of both VB's - What difference does the larger / smaller springs there make in Solenoids / driveability___?

Also as previously posted I used the black Sonnax Main Regulator & Sonnax Spring from 2001 VB, the Sonnax site says 96+ VB's all get same one so I am cool there~!
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Originally Posted by Darrin View Post
The bypass is to bleed off pressure from the Torque converter clutch circuit to prevent TC damage from over pressure. You can buy the Sonnax valve with or without the spring and it's ok to use the stock spring. Darrin
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Originally Posted by BUCK View Post
-- What difference does the larger / smaller springs there make in Solenoids / driveability___?

& I just noticed the really BIZARRE TRANSGO Brochure that I picked up in my "travels" calls it the LOCKUP VALVE so it has something to do with that too as indeed the bad Bypass Valve tried to Lockup but threw 3-4 Error Code.
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Yes, that valve bleeds off pressure from the TCC circuit once it exceeds the spring pressure. Too much pressure can cause TC damage. Darrin

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Last edited by BUCK; 10-24-2013 at 09:34 AM.
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post #3 of 11 (permalink) Old 10-24-2013, 10:21 AM Thread Starter
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ok, so Im wandering is the tranny going to take a crap again? Car was dyno'd and tuned with Xcal2. Tuner couldnt get converter to lock but told me to come back when I got it fixed. Tranny went up about a month later. After rebuild, the tranny shop still couldnt get converter to lock so they bypassed the system to get it to lock. Last week, I was messing with parameters on xcal2 and didnt change anything but still had to reupload tune that was uploaded in first place. (The tune that tuner put on that couldnt get converter to lock; tune that ive been driving on even since the tranny rebuild) Now, I want to make sure converter is still locking without spending the 50.00 diagnostic test drive from the tranny shop to tell me if it is or not.

Should have mentioned car had transgo shift kit before tranny died and it was rebuilt with the transgo shift kit and bypassed the system to get converter to lock. I wanted to post this in tuning forum also but we're not suppose to double post.

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post #4 of 11 (permalink) Old 10-24-2013, 12:02 PM
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What torque converter does it have?

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post #5 of 11 (permalink) Old 10-24-2013, 01:26 PM
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Bypass clutch control is actually opposite of controlling lockup, it controls the lube flow through the input shaft that releases the clutch. It is the only component I have ever seen cause full time lockup.
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post #6 of 11 (permalink) Old 10-24-2013, 01:45 PM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
Bypass clutch control is actually opposite of controlling lockup, it controls the lube flow through the input shaft that releases the clutch. It is the only component I have ever seen cause full time lockup.
Alan
After the car was tuned, the tranny shop couldnt get the converter to lock and they told me 3rd gear would get wiped out again. What did they do when they bypassed the system so the converter would lock and are any tunes from xcal2 that were put on car during the time converter woulnt lock...if those tunes are re-uploaded, is it going to wipe out 3rd gear again or did the shop prevent that went they bypassed the system?

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post #7 of 11 (permalink) Old 10-24-2013, 01:46 PM
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I don't understand how they bypassed the system, did they install an aftermarket valve in it such as the sonnax kit?
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post #8 of 11 (permalink) Old 10-24-2013, 02:21 PM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
I don't understand how they bypassed the system, did they install an aftermarket valve in it such as the sonnax kit?
Alan
I cant find the reciept to exactly what they did. Im pretty sure its a bypass clutch control valve. Car was dyno'd and tuned with Xcal2. Tuner couldnt get converter to lock. Told me to bring it back after i got the problem fixed. Tranny went up a month later. I had it rebuilt with shift kit. As the shop test drove it after rebuild, the convereter would still not lock and they told me to get in touch with tuner and find out what he did or 3rd gear was going to blow out again. Lots of back and fourth calls between tuner and tranny shop...I needed tuner to contact tranny shop himself. (Of which he was very pissed off about) Finally, the tranny shop said they could somehow bypass the system so the converter would lock in which it did and it was finally resolved.

That was all 3 yrs ago and in that time i did not even mess with the xcal2 anymore...i just wanted to drive the car. Until last week, i was playing with some parameters on the tune (not shift, spark or wot parameters, just the low and high fan temp parameters) then had to save and re-upload it. Now, that was the tune that was originally uploaded to the car (when converter wouldnt lock) Im just wandering did I re-uploaded the converter problem again? I don't know exactly what the tranny shop did, but they went around the system so the converter would lock...from my research, it sounds 95% like a bypass-clutch control valve but I cant find the paper work that says exactly what it was.

The tranny shop is ran by an old school type guy who doesnt save clients in a computer system...without my reciept, he can't tell me exactly what they did. He is a private shop, not an AAMCO or anything like that and he specifically tells clients over and over again SAVE ALL YOUR PAPER WORK. I may just have to pay the 50.00 and have them test run it and see if converter is still locking up or not but I thought I could save some cash.

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post #9 of 11 (permalink) Old 10-24-2013, 02:33 PM
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Are you sure it's not just a bad solenoid? It could be in the converter but that would usually shudder or something. I have had a direct clutch slip just enough to make me think it was the converter not locking. The pcm can only measure input and output it can not determine where the true slippage is.
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post #10 of 11 (permalink) Old 10-24-2013, 02:44 PM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
Are you sure it's not just a bad solenoid? It could be in the converter but that would usually shudder or something. I have had a direct clutch slip just enough to make me think it was the converter not locking. The pcm can only measure input and output it can not determine where the true slippage is.
Alan
Car is running fine. Transmission is fine, nothing wrong with it yet that I know of. Im just wandering if the tune was uploaded during the converter problem. (3yrs ago) I re-uploaded that same tune again because I was messing with some parameters, (last week) is it going to upload the old converter problem again or not?

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post #11 of 11 (permalink) Old 10-24-2013, 03:03 PM
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Only if the problem is in the tune.
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