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Baja bugs for Volkswagen virgins: The IRS transmission
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forgivemyspelling
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PostPosted: Mon Apr 30, 2012 8:38 pm    Post subject: Reply with quote

ive been looking all day for a 4.56 cant find it so 4.86 it is, does any one have any idea about top speed? , i use to have 185 15s and i could hit 90 barely. My new tire size is 235-75-15.
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kevmotocross
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PostPosted: Thu Oct 04, 2012 6:28 am    Post subject: Reply with quote

i have too tranny... one say

BS.... and the othe : PF...

COULD ANYONE HELPME TO IDENTIFY THEM
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PostPosted: Sun Oct 07, 2012 10:48 am    Post subject: Reply with quote

forgivemyspelling wrote:
ive been looking all day for a 4.56 cant find it so 4.86 it is, does any one have any idea about top speed? , i use to have 185 15s and i could hit 90 barely. My new tire size is 235-75-15.

http://www.johnmaherracing.co.uk/gearcalc.htm
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Mal evolent
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PostPosted: Sun Oct 07, 2012 11:07 am    Post subject: Reply with quote

or use the formula posted in the original post..

Mathematics rears its ugly head: OK, it's really just arithmetic and algebra.

MPH = RPM X LRTR / GR X 168

Where:

    MPH = MPH
    RPM = RPM
    LRTR = Loaded rear tire RADIUS, center of stub axle to pavement
    GR = Final drive ratio = internal gear ratio X Ring and Pinion ratio


168 is a fudge factor to take care of converting inches and minutes to miles and hours.

Example:

If we want to know how many miles per hour per 1000 RPM we can expect with a 4.125 R&P, .89 4th gear and 31 - 10.50-15s:

    MPH = ( 1000 X 15.5 ) / ( ( 4.125 X .89) X 168 )
    MPH = ( 15500 ) / ( 3.67125 X 168 )
    MPH = ( 15500 ) / ( 616.77 )
    MPH = 25.13 MPH / 1000 RPM

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cmiller95
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PostPosted: Sun Oct 07, 2012 9:40 pm    Post subject: Reply with quote

I cureently have a swing axle in my Sandrail. Im converting it to IRS. Do the IRS and swing axle trans have the same differential? Can i just change side plates and the side gears to the irs ones and be on my way? oh ya and the flanges
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PostPosted: Wed Oct 10, 2012 1:04 pm    Post subject: Reply with quote

anyone?
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PostPosted: Wed Oct 10, 2012 7:59 pm    Post subject: Reply with quote

cmiller95 wrote:
I cureently have a swing axle in my Sandrail. Im converting it to IRS. Do the IRS and swing axle trans have the same differential? Can i just change side plates and the side gears to the irs ones and be on my way? oh ya and the flanges


Yes, Maybe, No.

All three of those answers could apply, depending on a lot of variables.

No to just changing the side gears and flanges. They are totally different.

No to the same differential.

Maybe to the same ring and pinion and maybe a differential swap.

Yes to needing to reset the back lash if a differential is changed.

I reccomend to just buy a IRS tranny and use it.
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PostPosted: Fri Oct 12, 2012 8:49 am    Post subject: Reply with quote

The inside gear set of my swing axle isnt stock so i dont wanna get rid of it. If i buy an irs superdiff, irs side plates, and the irs side gears, i set teh backlash on the diff. Is that what would be needed?
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PostPosted: Mon Oct 15, 2012 8:32 am    Post subject: Reply with quote

cmiller95 wrote:
The inside gear set of my swing axle isnt stock so i dont wanna get rid of it. If i buy an irs superdiff, irs side plates, and the irs side gears, i set teh backlash on the diff. Is that what would be needed?


You hit the nail on the head.

That is exactly what is needed, plus the CV flanges.
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forgivemyspelling
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PostPosted: Sat Oct 20, 2012 11:58 pm    Post subject: Reply with quote

so i tryed to put the 4.37 in my self the trany got mad at me after i started driving it hoping out of gears and stuff ,didnt adjust it properly,so i gor one off craigs list totaly lucked out it had a close ratio 4th
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PostPosted: Sun Mar 17, 2013 6:57 pm    Post subject: using 73 suoer beetle transmission for 71 super beetle Reply with quote

I want to use the 73 tranny I have and put it into my 71 super beetle...what changes do I need to do? Cool
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75smith
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PostPosted: Sun Mar 17, 2013 7:25 pm    Post subject: Reply with quote

might need to change the nosecone, or the mounting bolts... should have 2 or 3 bolts, depending on the year...other than that everything should be the same
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JiI
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PostPosted: Mon Aug 19, 2013 10:14 pm    Post subject: Reply with quote

Could anyone give me a walkthrough on flipping the R&P for mid engine? Going to be running a 2 liter T4 engine, a T1 IRS, hopefully with a 4.375 R&P. 31" rear tires, 1,200 lb total car weight.
Jeff
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JustBuggy
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PostPosted: Tue Aug 20, 2013 5:03 am    Post subject: Reply with quote

What frame are you using for mid engine?
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JiI
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PostPosted: Tue Aug 20, 2013 6:11 am    Post subject: Reply with quote

Full custom. It's for a (gasp!) Volksrod.
Jeff
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joescoolcustoms
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PostPosted: Tue Aug 20, 2013 6:55 am    Post subject: Reply with quote

Measure the back lash between the ring and pinion before taking apart. Flip the ring gear and set the back lash to the same amount. The shims that set/adjust the back lash are behind the carrier bearings. Make sure to keep the same overall thickness of shims to maintain the proper pre load on the bearings.

I used to run a mid engine drag rail that weighed in at 804 pounds. Lotts of fun.
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JiI
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PostPosted: Tue Aug 20, 2013 9:27 am    Post subject: Reply with quote

joescoolcustoms wrote:
Measure the back lash between the ring and pinion before taking apart. Flip the ring gear and set the back lash to the same amount. The shims that set/adjust the back lash are behind the carrier bearings. Make sure to keep the same overall thickness of shims to maintain the proper pre load on the bearings.

I used to run a mid engine drag rail that weighed in at 804 pounds. Lotts of fun.


I have no idea how to do what you just said to do.
Jeff
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joescoolcustoms
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PostPosted: Tue Aug 20, 2013 9:49 am    Post subject: Reply with quote

Best take it to a VW trans expert. It will need to be a double side cover trans case.
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GA_Boy
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PostPosted: Tue Aug 27, 2013 9:01 pm    Post subject: Reply with quote

Am I the only one that has a problem with this formula in the first post?

Loaded tire radius???????????? The circumference of the tire does not change with load so using Radius under load seems to me to be wrong. Please correct me if I am wrong. Radius at 9, 12, and 3 O'clock is fine IMO.
Marvin (See formula below)

Where:

•MPH = MPH

•RPM = RPM

•LRTR = Loaded rear tire RADIUS, center of stub axle to pavement

•GR = Final drive ratio = internal gear ratio X Ring and Pinion ratio

•168 is a fudge factor to take care of converting inches and minutes to miles and hours.
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Mal evolent
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PostPosted: Wed Aug 28, 2013 5:25 am    Post subject: Reply with quote

air down to 10 PSI. is the radius the same at 12 o clock, 3 o clock, 6 o clock, and 9 o clock?
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