posted by
someone claiming to be Mike
on
Sat Oct 23 07:40 CST 2021 [ RELATED]
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If I install this unit from IPD on a 93 240 - will I be able to down shift 4th to 3rd by increasing throttle - for going up a steep hill?
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My favorite post on this topic: https://www.brickboard.com/RWD/volvo/737816/volvo_240_automatic_transmission_overdrive_circuit_spellchecked.html
I do believe the attached picture is Art's, showing where to cut a slot in the solenoid o-ring grooves.
Edit: D'Oh! Art already linked to that post, I'm two days late...
Also interesting that iPD's bypass plate appears to be cheaper today @$29.95 than it was many moons ago. Plenty of posts over the years referring to a $40 cost. Seems they've made their tooling costs back, or perhaps are competing with the cost of a new Dremel grinder...
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XC60 / Odyssey
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Hi,
I have a 1992 automatic transmission that has the overdrive mode that I think you are referring too?
The overdrive portion is like a fourth gear on an automatic or a fifth gear used in a manual transmission in comparison.
It’s my understanding it does the opposite?
Another way to say this is …It removes the switching feature of “locking out” the overdrive and therefore it stays locked in overdrive mode.
On long Steady grades the overdrive, if the transmission is working correctly for conditions, it can get to shifting back and forth too much and then becomes a nuisance to some owners.
Instead of using the switch for lock out, they want the bypass it!
In my opinion it’s not the wisest move as since terrains and destinations change and then you won’t have the advantage of the lower gearing range when needed.
If your the lock out feature worked you should have a arrow on the dash come on when you are OUT of overdrive.
YOU should have better pulling power with the arrow ON!
Some get it backwards especially if the transmission isn’t working correctly!
If working, it would get the more power for pulling the hills and still be able to coast better down the grades with the light OFF! It’s a nice feature once learned.
Another reason “others” get a bypass is for not getting the solenoid to shift the transmission in or out of overdrive! They put it in to get overdrive!
Most likely there might is a malfunction in a transmission that started the product for sale!
This valve body’s operations are totally inside and are governed by internal speed, throttle position or of the Kick down Rod, in essence.
The rod is used for a hard acceleration and getting into the second gear range, of which, really makes the engine scream!
The unknown here is, Yours might be out if adjustment for that arena depending on how bad you are missing power?
Since you don’t have the extra torque this might be some of the case and therefore the IPD bypass, still, would not be the answer, at all!
It is my understanding that the bypass plate keeps the overdrive’s ratio engaged during the entire use of the third gear.
It makes or keeps the third gear being a higher ratio of “A” third gear.
Not exactly what you want to pull a grade!
Third is then highest gear available in an automatic.
It’s Like forth gear in a manual. One engine turn for one turn of drive shaft.
The overdrive switch feature changes or swaps any mileage gain around for some more torque capability that you want to pull a grade in high gear at some reasonable highway speeds!
The overdrive averages about 15-20 percent less engine wear and promotes better mileages.
Otherwise, It would be like putting in a taller gearing of a rear end, not the way to go for you and hills.
But letting stay in it all time was not the intentions of the designers!
Put the money for purchase of that bypass into tuning up the transmission with clean new fluids and a adjustment evaluation!
Follow the arrows way! ^^^ (:)
Phil
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Hi Art!
Your response was one word!
Wow! That has to be in for a three letter challenge, like yep! (-:)
Ok then, I guess I’m as wrong as it comes and goes on this overdrive question.
I only have one automatic transmission Volvo.
I thought the bypass left you with a higher third gear ratio, period?
Isn’t the purpose of Bypasses about the lock-in capability to a lower drive ratio?
So does the IPD plate shunt the internals of the transmission so it will never stop working for shifting up and down and ignores the kick down mode or enhances in some way?
Maybe his transmission isn’t shifting back down either and his need for the post?
I’m lost and I never had it explained to me the reason for IPD’s racing modification kit!
I thought the throttle link was for those serious kinds of accelerations, yet still depending, on speed governorship to prevent over revs? No electronic controls in play here!
When I drove my 1992 around the Wagonmeister’s place, south of Bakersfield’s area, there were some long grade stretches that made you decide to lock out the OD and use third or maybe even second, if heavily loaded until you climbed out?
Does that mean you cannot stop it from shifting back and forth continuously?
I thought the solenoid holds the overdrive out of service when pulling.
I’m really confused as to what the term bypass means.
I seldom ever use the lock out feature as mountain travel is not in my normal driving needs and my 1986 manual wagon is my hauler!
Phil
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Hi Phil,
Truly looks like you've been spared this long-time issue with the AW transmissions where the relay circuit board solder cracks, the white wire to the solenoid loses its insulation, and/or the solenoid swells, rusts, and quits.
The term "bypass" is just a plate that allows the hydraulic fluid to flow as if the lockout solenoid is in normal driving mode, orange up-arrow not lighted. IPD supplies this instead of you having to get out your Dremel to cut a path in the dead solenoid. The solenoid valves are (or were anyway) very expensive.
This rant may not be the most technically accurate description of the overdrive lockout, but it surely is the most entertaining. I'm certain you will both enjoy the poster's humor and feel his pain as I did:
https://www.brickboard.com/RWD/volvo/737816/volvo_240_automatic_transmission_overdrive_circuit_spellchecked.html
--
Art Benstein near Baltimore
"I don't want to retire. I'm not that good at crossword puzzles." -Norman Mailer
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Thanks Art!
That thread is just what I needed to put my apples back in the crate!
That sucker is working backwards to the three M46 Laycocks I have.
Totally explains my confusion.
Yes, I was spared the experiences of an automatic by not relenting on the M46 with the electric/hydraulic overdrives.
I’m going have to look for pictures of the automatics solenoid “in place” to understand how hard it is to get to.
It doesn’t sound like it’s a nice easy place to scratch its bolt heads. (:-)
In 2005, when I retired, I found a 1991 with a M47 manual that has been really good to me.
Apparently, it was well maintained by the father of the PO.
The daughter kept up the maintenance but was being tuned up by our local independents so badly that she could make a new car payment instead? Yes, was lucky again.
But since then, I read stories about bad M47s on the BRICKBOARD and TurboBricks.
Mostly from bearing failures and maintenance neglect. Some weak due to racing abuse too!
I’m a rather meek stock driver but I expect endurance!
My wife wanted another car to keep at my second house so I bought a car from the Wagonmeister in 2017. He only had an automatic refurbished at the time. Remember wife wants! (:)
Its automatic was apparently rebuilt or something as it has worked flawlessly for about 27,000 miles, I believe it was, just as David Samuels said! Thank You, the Previous Owner and the Wagonmeister.
Yes, I have been blessed with getting good cars for years.
I did purchase another car in 2019, from Reno Nevada.
A 1993 with another M47 transmission.
I was on alert and suspicious about this one for a slightly stiff shifting or drag between gears.
But This car was in near beautiful shape, much like the Wagonmeister one.
I had a spare 1990 “untested” one stashed away with an untested engine from a JY pull many years ago!
So that Tells me, I got starry eyed and I may have worn my guard down a little!
I also didn’t know it then, to my chagrin, I may have been losing some of my hearing.
It has gotten worse since to about 20% of few certain frequencies.
One is, of the Wife and the other M47 transmissions! (:-)
Apparently the wife value counted more, as I now have two hearing aids!
Those my ears and my wife checking up on them, to be on me! (:-)
I have stopped collecting anymore cars or extra parts, since pretty much, the cheap supply has dried up a lot!
The 1993 transmission went noisy in about 5,000 miles because her independent put in regular gear oil when they changed out her clutch! She also wanted a new car!
My 1990 M47 is now in the 1993 and has less than half the noise.
I went with Fuchs synthetic orvVolvo equivalent and it has seemed halt it from getting any worse.
It’s NOT a fix but IT might be even quieter over recent mileages since.
I do replaced my ear batteries! %(:)%
I want to go through the 1993’s transmission on the bench and scope it out.
I’m sure all it needs is a new bearing or two. Appears to be a Rear countershaft or a center needle on the main shaft. A slight misalignment going on to me?
It has to be torn down, inspected and reset!
I have high hopes for my nineties cars. Better if I ever get the cars rotated around to my car lift.
COVID-19 has idled those traveling events for a couple cycles now!
I need to change the automatic’s fluids but cannot figure out if the “exchanging pump out” is a good way to go.
With 600 miles of commute between areas it does push me to ponder doing the exchange method?
I got to study for the fittings I need to buy to do it with?
Is there a thread for this too?
What do you think of the “on the ground” type of fluid changing being done at home on these Toyota/Aisin transmissions?
Is it effective?
Have you done this?
Phil
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Yes
--
Art Benstein near Baltimore
"When they tell me I'm too old to do something, I attempt it immediately." -Pablo Picasso
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posted by
someone claiming to be Mike
on
Sun Oct 24 04:43 CST 2021 [ RELATED]
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So if I install this bypass - if in 4th(OD) and I floor it - it will go into 3rd, just like a regular tranny?
Thanks
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Yes, and you'll have 4th gear again, assuming you can keep the grit from falling into the ports you are bypassing. Clean the area well. Use a mirror and a good light.
--
Art Benstein near Baltimore
Mistakes are the portals of discovery. -James Joyce
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