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  #46  
Old 03-06-2003, 05:19 AM
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Question

60 kph is pretty low speed James.

Did you mean to say 60 mph?

I don't let mine into Drive until I see 95 or 100 kph on the clock [my clock is still Japanese spec], and not even then unless I am travelling unrestricted highway or main road where I can hold D4.

Joe
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  #47  
Old 03-06-2003, 12:02 PM
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Re: Confirm a point:.....

Quote:
Originally posted by svxistentialist



My guess is you probably drive in 4, or even 3 around town, at 45 the car has to be rolling at tickover.

Joe
hate to brake it to you, but i would be in 5th. You cant really take that to heart in this discussion thgough, between the 4.11's and the higher gear ratio's, im looking at 2300rpm at 45(in fifth), But it definetly is feasable at 45, i just prefeer to get the best gas mialge you can. And the TQ with this engine and the 5 speed is glorious, i dont even use first gear most of the time!
phil


p.s. lemme check what 4th is at 45 when i get home
phil
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  #48  
Old 03-06-2003, 04:06 PM
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Re: Re: Confirm a point:.....

Quote:
Originally posted by Phast SVX


hate to brake it to you, but i would be in 5th. You cant really take that to heart in this discussion thgough, between the 4.11's and the higher gear ratio's, im looking at 2300rpm at 45(in fifth), But it definetly is feasable at 45, i just prefeer to get the best gas mialge you can. And the TQ with this engine and the 5 speed is glorious, i dont even use first gear most of the time!
phil


p.s. lemme check what 4th is at 45 when i get home
phil
Thanks for the answer Phil, and the honesty.

I had forgotten you were using a lower diff. If you still used the standard, about 3.89 if memory serves, you would be at 1700-1800 rpm, and not as ready to pull away. Not a true or fair comparison really.

Still like to hear how the 4.44 works with the auto.

Joe
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  #49  
Old 03-06-2003, 04:15 PM
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Re: Re: Driving in Manual in traffic.

Quote:
Originally posted by Trevor


Harvey your comment would be appreciated.
I not know Trevor, It's worth a try. The only other thing what may be a problem, is that the manual button is for use on ice and slippery conditions, or so we are told in the book. I would think to this end, the shift map in the TCU would be a very smooth, when used with small throttle apllications, with the torque reduced between changes and the actual engagment of the band and clutches buffered even more than they are now, to reduce the risk of wheel spin.

I think this shift map would be unsuitable for more powerfull driving as it may lead to excess slipping of bands and clutches. Taking off in 2nd would increase the load on the box, while holding the engine rpm low with the resualtant low line pressure.

If you think about it, the line pressure is between 64 to 82 psi at idle rising to 164 to 182 psi at 2500rpm. So how much pressure is there, clamping the friction surfaces, as you take off in 2nd gear at a fast idle?

Harvey.
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  #50  
Old 03-06-2003, 09:33 PM
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a bit confused

Ok, I'll start by answering the question. I always drive in D. Even going uphill, or downhill (actually downhill is a different story, depends how steep).

Why?

Simple, the tranny designed to do that. It is designed to shift up and down. And not only that, the common sense, when the RPM is low, you get less wear on the engine, when RPM is high, it is easier in some cases for the engine, but you use it up a lot more.

Of course, SVX has a very weak tranny, but by driving it in 3d, you don't save it at all. You force it to spin at a very high RPM, and burn all the clutches inside, or wear them out a lot faster.

Going back couple pages back, when Trevor said that
Quote:
When left to its own devices it will hunt up and down from D to 3
, please correct me if I am being wrong, or excuse me if I am being impolite, but the tranny does not always shift D to 3. It shifts 1-2-3-Lock up-4-lock up. Going down it skips Lock up, but from what I know that shifting does not really hurt the tranny as much as spinning it at a very high RPM.

If you guys interested in more details, I will ask my mechanic about all this, he knows a lot more then me, since he works in the tranny shop.
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  #51  
Old 03-07-2003, 05:20 AM
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Zamorush,


Operation of the tranny is slight different in all SVXes. It depends on the model year ( 92-93, 94-95, 96-97)and whether Trevor has a European, Asian or NA model SVX.

From now on when we discuss tech items we ought to list the MY and model and world area that our SVX was meant for.

I now have 3 SVXes, MYs 92, 94, 97. All are USA cars. All have orig. trannys. All have different shifting characteristics.
Heck even the seats feel differnt. The 94 has the firmest driver's seat. The 92 is less firm. The 97 is the softest and cushiest.
I love all 3. they are just slightly different.
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  #52  
Old 03-07-2003, 12:22 PM
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sounds good to me...........

Tell you the truth I was just generalizing all of them because they all have the same model of transmission. There are some differences though, i am sure about that, although I have to research on that.

By the way, most of the Subarus have same tranny as an SVX (again model #) it does not mean that they all have same insights, but you can still swap them.
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  #53  
Old 03-08-2003, 06:09 PM
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I drive in third quite a bit. the trans turns the same speed as engine in 3rd. 1:00-1 ratio. I normaly keep rpms under 4grand when doing this. If the trans would stay in drive I would use it more. Just doesnt cooperate much on some days.
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  #54  
Old 03-08-2003, 06:18 PM
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Re: Re: Re: Confirm a point:.....

Quote:
Originally posted by svxistentialist


If you still used the standard, about 3.89 if memory serves,

Joe
all north american SVX's come with the 3.53......im not sure on the aussie's...but i think they share the same diff as you,as you said the 3.89
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  #55  
Old 03-08-2003, 08:02 PM
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automatic = manual

So basically when you drive in 3d, this is the same thing as you drive a manual transmition but never switch to 4th, and 5th gear.

Right?
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  #56  
Old 03-08-2003, 08:17 PM
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Almost. It would be the same except for torque converter slippage.
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  #57  
Old 03-08-2003, 08:38 PM
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Quote:
Originally posted by Earthworm
Almost. It would be the same except for torque converter slippage.
so no, its not the same...trust me@!!! You know, the tranny in my last SVX lasted for 171k (through 3 owners) the first owner flushed the tranny around every 20k, which i have records of, also he had the tranny filter and anexternal cooler installed at 9k miles. second owner did not and from 147 to 170 the clutchpacks went, vavlebody clogged, and he managed to break the flexplate.

HERE IS THE KEY.....The first owner(whom i have spoken to multiple times and is very excited about where his car is now) had a corvette for his weekend car. He drove the SVX all highway to clients. There fore, his tranny shifted very few times compared to your average car.
The second guy did none of the above, drove around town, and did very little highway driving at all. His average trip was 2 miles to work. The wear and tear involved with intown driving seems to be the culprit in my eyes.

my 2cents, take it or leave it
phil
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  #58  
Old 03-08-2003, 10:11 PM
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Re: automatic = manual

Quote:
Originally posted by zamorush
So basically when you drive in 3d, this is the same thing as you drive a manual transmition but never switch to 4th, and 5th gear.

Right?
Not the same. Basically like driving in 1st 2nd 3rd and 4th and never switching to 5th when driving a 5 speed manual.

When comparing with a manual you should think more along the lines of a three speed with overdrive i.e. 3 is direct drive and what would be normal top gear in an old three speed with 4 being an overdrive.
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  #59  
Old 03-09-2003, 12:03 AM
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I see what you mean Trevor.
So here is another question then, what is the point not switching in 5th then, or D? Your RPM is pretty high, and you are wasting a lot of gas.

However, if you live in such area like San Francisco, or some place crowded, then you just go from light to light, and it is better just to keep it in low gear. For me though, every day commute is a 45-80-45 mph all the way to college. I just keep it in D, and no hassle.

Still, though, automatic will go to 4th even if you are driving 25 mph, and you can just cruise......

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  #60  
Old 03-09-2003, 05:49 AM
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Zamorush,

The main point of not wanting to allow the car to change up to D or 4th ratio at slow speeds has been covered in detail in some of these threads, particularly by Harvey, ob-au, you can search his posts.

Because the final drive is so high, 3.53 as Phil corrects me, and because 4th is a very high overdrive at 0.694, this means if the car is travelling at slow speeds with 4 engaged, the engine is only turning over at 1500 rpm +. This is very restful in a "cruising" sense, but puts high torque loads on the internals, and also, the pump oil pressure in the box is not up to maximum because the revs are too low.

Line pressure being too low means the brake band which operates on 2 and 4 may not have sufficient grip to avoid slippage. Most of the people who have replaced/rebuilt ther trannies first notice the wear as a "flare" on 2.

The shift map causes the box to seek 4 at about 45, and will slip the TC rather than drop to 3 unless you make it kick-down or get POWER engaged. This puts heat and torque loads on the tranny.

These loads are a contributary factor in the recurring tranny failures. If the final drive was lower, say 4.11, then possibly the current shift map would work very well, this is discussed in another thread.

Joe
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