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phunkdoktaspok
Re: What is this diff ratio ?
#21
No life (a.k.a. DattoMaster)
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Quote:

edp wrote:

My take on forums like this is to share experience & knowledge which benefits everyone in a positive way regardless of their level of expertise. By telling people to "be logical" & "thinking a particular way is pure stupidity" doesn't seem to fit that bill.



Oh no doubt. I whole heartedly agree with you on that.
Most people on this forum will know my point.
That is that one particular dodgy person on this forum posts bullshit to appear most knowledgable.
You will notice this person has already gone back and edited their posts to reword them correctly.
example " do you believe its original diff" " If it is the original diff"
Its only stupidity to tell someone what specific part they have will only be XXXX.
If only this forum showed that posts were edited. History know many people have made note of such things from this member.

Anyway im a bad guy like normal. Sorry for ruining your thread.
This forum used to be great many years back. Hence why numerous long time members rarely post nowdays.

Posted on: 2008/2/27 7:32
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edp
Re: What is this diff ratio ?
#20
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so Steve, (aka - phunkdoktaspok) let me ask you a question, what do you feel the point is of contributing to a thread if you have noting to add positively to it? you said nothing in any of your three posts in this thread that contributed in any way whatsoever, you reiterated something Burt said & then lectured on logic.

Burt pointed in a direction which was quite helpful & I appreciated it.

My take on forums like this is to share experience & knowledge which benefits everyone in a positive way regardless of their level of expertise. By telling people to "be logical" & "thinking a particular way is pure stupidity" doesn't seem to fit that bill.

There's an old saying which I'm sure you're aware of, I think it goes something like this " If you dont have anything decent to say then shut the f**k up!"

Posted on: 2008/2/27 6:16
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phunkdoktaspok
Re: What is this diff ratio ?
#19
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Ahh ok cool so its clearly stamped on it.
No logic was needed and definately no manual.
Just pure common sense to pull it and check it.

Any way Im off to get rego on my 1200, I will take the manual and specs and swear till im blue in the face that my engine can only be an A12.
Pure stupidity to think by that so called logic.

Posted on: 2008/2/27 5:28
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b310gx
Re: What is this diff ratio ?
#18
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The original question also asked should he keep the diff or throw it away. My advice would be to keep the centre, but pack it with grease or some other perservative, & stick it in a bag somewhere. The diff in your current car might last years, but it will wear out eventually, & will it be easy to find a good replacement, especially if its in a few years time. I always seem to through away something that would have come in handy almost immediately, i think it's called Sod's Law.

Posted on: 2008/2/27 1:10
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Dodgeman
Re: What is this diff ratio ?
#17
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In the end it was fairly obvious.
1. The car was a stocker & not a racer with Nismo parts.
2. It had an iron carrier H145 differential
3. Only two ratios were ever made for this diff, that being 3.9 & 4.11 to 1
4. Only one of these two ratios were ever used in new 1200's sold in the US.

As long as it was the original diff in the parts car, there was only one answer, ... there's no rocket science here, just logic & a manual.

Posted on: 2008/2/26 22:27
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edp
Re: What is this diff ratio ?
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Thanks Burt. it was a good suggestion & helpful to read up on it.

I knew the cornering example of one wheel turns at a higher rate then the other but I didn't think it affected the axle rotation rate while not loaded (not sitting on ground) & not breaking free from the other axle, always good to learn something new.

If anyone care this was an interesting read on differentials:

http://www.houseofthud.com/differentials.htm#open%20diff

phunkdoktaspok wrote:
"So did you take the time and calculate what centre you have yet? maybe it really is 3.9-1 maybe its just a rough guess.
I dont see any logic in asking how to do something and then just taking a rough guess."

As I said "I pulled the diff" it's stamped right on it next to the little Nissan logo 39.10. Logic would dictate that's the correct ratio, seeing that it came out of a 1200 coupe whose spec book (factory manual) say it standard w/a 3.90 ratio. That seems pretty logical to me......but I could be wrong, I have been before.


Posted on: 2008/2/26 15:17
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phunkdoktaspok
Re: What is this diff ratio ?
#15
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Quote:

edp wrote:
OK, the answer is....3.90! I pulled it out, stuffed the axles back in the housing & rolled it out the door. I contemplated keeping the axles too but couldn't figure out an easy way to keep it a roller so someone else, likely a tow truck, can pick it up.

I'm curious - Burt said "cannot calculate accurately whilst in the air" - why not?

what difference is it if the wheel is turning on the ground or the axle end turning in the air, it's still turning the same # of revolutions.

Anybody want a partial rolling chassis? Free!! DD, your close, the wife would be really happy to have another 1200 at the house!


So did you take the time and calculate what centre you have yet? maybe it really is 3.9-1 maybe its just a rough guess.
I dont see any logic in asking how to do something and then just taking a rough guess.

If there is logic in just going off what a specs book tells, My 1200 just like 90% of the 1200's on this site, will have some strange looking A12 motors and various other parts. Specs books are very important, but so is a little common sense.

Maybe the wiki should be changed to ONLY show what specs are applicable to specific countries. God knows my Australian 1200 does not have anything only specific to Japan.

Posted on: 2008/2/26 9:20
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Dodgeman
Re: What is this diff ratio ?
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Quote:

edp wrote:
I'm curious - Burt said "cannot calculate accurately whilst in the air" - why not?
You need to turn both axles exactly the same amount, which is why you push the car forward in a straight line while counting revolutions of the drive shaft.

Ensuring that both wheels, or brake drums turn exactly one revolution, or ten, or whatever, is extremely difficult when the rear end is in the air & we are discussing measurements as little as one tenth of a revolution here.

Looks like the book data & a little logic was right again.

Posted on: 2008/2/25 13:15
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PIGDOG
Re: What is this diff ratio ?
#13
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cant calculate in the air coz in a single spinner if only one wheel is being turned you would end up with 1.95:1 ratio(as spider gears double the speed from memory), unless you turn both wheels at once

thats why you wheel spin alot more with a locked diff and broken axle than you do with an open centre

Posted on: 2008/2/25 10:34
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ang94541
Re: What is this diff ratio ?
#12
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If it's in the air you have to fix one axle and turn the other 2 turns counting the pinion shaft revolutions as you go.
At least that's what I do at the junkyard.

Posted on: 2008/2/25 9:56
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