HYDRAMATIC horrors

Driveline (including transmissions, differentials, tailshafts) discussion.

Re: HYDRAMATIC horrors

by Mtb2rusty » Mon Oct 13, 2014 4:02 pm

Yes mine is a factory auto sedan. To Chop or not to chop :?
 
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Re: HYDRAMATIC horrors

by utility8 » Mon Oct 13, 2014 5:27 pm

Cutting & modifying is minimal, end result is very worthwhile. Makes the car much better to drive.
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Re: HYDRAMATIC horrors

by Mtb2rusty » Sun Oct 19, 2014 2:14 pm

Ok got the trimatic sitting in :D thanks guys for the advice prior.
I see I have a 3.55 diff. with a trans 1:1 in top I think the motor may be revving on about 3000+ rpm at 100km/hr.
We will be doing mostly highway travel. Can anyone send a link or know how to calculate the rpm in top gear at 80miles/hr or 100km. I just don't want a rig thats uncomfortable to cruise in on the hw. All local highways are 100.
I'm yet to get speedo cog
 
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Re: HYDRAMATIC horrors

by EH Axiomatic » Sun Oct 19, 2014 3:20 pm

Mtb2rusty wrote:Yes mine is a factory auto sedan. To Chop or not to chop
Mtb2rusty wrote:Ok got the trimatic sitting in


Did You Chop or not chop?
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Re: HYDRAMATIC horrors

by Mtb2rusty » Sun Oct 19, 2014 4:19 pm

Yes chop. otherwise the top of trans hits on the body crossmember and you can't get up high enough to fit transmission xmember. There is about 3-4mm differance in hight between the centre of output shafts and mounts (hydra and tri) I guess thats neither here not there so no mods really needed unless to get longer bolts for trans xmember and space it down if that makes sense to create a little more space for torque and general movement.
No massage used thankfully.
Correction to previous post I ment to say "comfortable on highway" as you may have guessed.
Has anyone got a eh ute for sale I want a factory light blue one in fair condition with no mods. Just thought I would put it out there
 
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Re: HYDRAMATIC horrors

by EH Axiomatic » Sun Oct 19, 2014 4:33 pm

Mtb2rusty wrote:Yes chop
Mtb2rusty wrote:No massage used thankfully

So to clarify , The chop was done on the banana shaped Transmission support mount and no chopping or massaging of the floor?

Formulas to follow .
What is the tyre size You are using e.g. 205/60/ R13... ?
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Re: HYDRAMATIC horrors

by utility8 » Sun Oct 19, 2014 5:08 pm

Good to hear you got it in, you'll be quite happy with it.
I have approx 600mm diameter tyres with a 3.36:1 diff ratio & the maths comes in at around 2850 RPM for 100 kph, (so a tad over 3100 RPM at 110 kph).
In my car a 3.55:1 would change 100 kph of 2850 RPM to approx 3000 RPM. (Approx 5% change)
In my car a 3.08:1 would change 100 kph of 2850 RPM to approx 2600 RPM. (Approx 15% change)
Perhaps a 3.08:1 would a good option if you're looking at highway.

As side note, mounting the crossmember lower with spaces is not an easy job as the mounting bolts go in at an angle.
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Re: HYDRAMATIC horrors

by EH Axiomatic » Sun Oct 19, 2014 6:19 pm

Formulas don't seem to "format" in the traditional way here .. so I have posted a picture of formulae out of my file.

This is also good info to have for camshaft selection...

If you are running 205/60/R13 the tyre diameter is 22.7"
So at 60MPH (96 kph) with 3.55 it calculates to 3152 rpm

with a 2.78 then rpm is 2468 (Torana 6cyls did have this ratio with trimatics)
with a 3.08 then rpm is 2735

Have fun with the calculator :D
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formula rpm mph diff ratio.JPG
formula rpm mph diff ratio.JPG (136.48 KiB) Viewed 3463 times
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Re: HYDRAMATIC horrors

by Mtb2rusty » Sun Oct 19, 2014 7:49 pm

Files! this is great 8-)
 
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