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Author Topic: Fabr's Car-VW/busa crossbreed  (Read 264088 times)

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Offline Engineer

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Re: busa/VW crossbreed?
« Reply #90 on: October 26, 2008, 06:53:57 PM »
I fat fingered about 100 keys, but they are fixed now. ;D

Bug, Master figures that if the output on the countershaft of the busa is close to the same Rpm as the VW engine runs, it will all work out.

After master pointed out my fubar on the primary math, I fixed my post on page 5.  With the .082 high gear and 4.57 ring and pinion in the 091, with 31" tires top speed is 155 MPH.  Might want to go with a 5.xx ring and pinion, and if your putting aftermarket gears in go with closer to 1:1 for high.
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Re: busa/VW crossbreed?
« Reply #91 on: October 26, 2008, 06:56:05 PM »
Agreed, that was why i was mentioning the R and P...
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plkracer

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Re: busa/VW crossbreed?
« Reply #92 on: October 26, 2008, 07:18:42 PM »
Reality check time... What does an 091 with aftermarket gears cost?
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Re: busa/VW crossbreed?
« Reply #93 on: October 26, 2008, 07:23:38 PM »
Less than any good FNR box on the market??? :laugh:
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Re: busa/VW crossbreed?
« Reply #94 on: October 26, 2008, 07:25:29 PM »
And there is not many fnr boxes on the market with 4 gears in them....
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Online fabr

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Re: busa/VW crossbreed?
« Reply #95 on: October 26, 2008, 07:32:43 PM »
The countershaft rpm would be approx 6600 rpm input to the 091.That would make a top speed of 101.6. You sure you're an engineer? Just kidding! ;D
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Online fabr

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Re: busa/VW crossbreed?
« Reply #96 on: October 26, 2008, 07:34:23 PM »
Quote from: plkracer on October 26, 2008, 07:18:42 PM
Reality check time... What does an 091 with aftermarket gears cost?
3-4K
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Online fabr

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Re: busa/VW crossbreed?
« Reply #97 on: October 26, 2008, 08:21:21 PM »
Run the busa in 5th and top speed would be 73.5 MPH.I'm betting it'd accelerate like a rocket!
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Online fabr

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Re: busa/VW crossbreed?
« Reply #98 on: October 26, 2008, 08:23:07 PM »
Then click it into 6th and AWAY you go!
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Online fabr

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Re: busa/VW crossbreed?
« Reply #99 on: October 26, 2008, 08:23:33 PM »
With a STOCK busa !
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Engineer

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Re: busa/VW crossbreed?
« Reply #100 on: October 26, 2008, 10:14:29 PM »
Quote from: masterfabr on October 26, 2008, 07:32:43 PM
The countershaft rpm would be approx 6600 rpm input to the 091.That would make a top speed of 101.6. You sure you're an engineer? Just kidding! ;D

 aa:

Time to show your math work Fabr........

6600 RPM input
? ratio high gear in 091
? ratio Ring and Pinion
? size tire

Your top speed must be in 3rd......  Grandma.
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Online fabr

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Re: busa/VW crossbreed?
« Reply #101 on: October 27, 2008, 06:18:03 AM »
Oops I fubarred.I added in the 1.596 reduction twice. So I'll assume the busa will not pull to redline in top gear with the weight and added geartrain.Assume a busa top speed rpm of 8500(safe rpm for long distances).That makes countershaft rpm 5325. Change R&P to 5.37:1 . Top speed is 111 with a 31" tire. In 3rd gear top speed at redline would be 89MPH.  Hmmm ,still thinking.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Online fabr

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Re: busa/VW crossbreed?
« Reply #102 on: October 27, 2008, 08:39:41 AM »
OK ,this is what I've come up with using Albin R&P(5.43:1) and Albin 3rd(1.5:1) and 4th(1.0:1). Assuming the busa is capable of turning 10500 in each gear which makes countershaft =6862 RPM with busa in (1.043:1)6thgear. Use 31" tires.Assume no tire slip in sand.
1st-3.80:1=30.66 MPH
2nd-2.06:1=56.58 MPH
3rd-1.50:1=77.69 MPH
4th-1.0:1=116.54MPH

 Look better? Albins makes a boatload of 3rd and 4th gear ratios.I'm open to suggestions on the ratios for 3rd and 4th.

« Last Edit: October 27, 2008, 10:42:24 AM by masterfabr »
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Online fabr

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Re: busa/VW crossbreed?
« Reply #103 on: October 27, 2008, 11:14:29 AM »
Or in 5th with the busa top speed would be 98.33mph and in 4th with the busa it would be 86.94mph.  Cruising speeds would of course be lower by 20 miles an hour or so.Also factor in the tire slip in sand and this seems like a viable idea.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

plkracer

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Re: busa/VW crossbreed?
« Reply #104 on: October 27, 2008, 11:22:38 AM »
Tire slip in sand is for sure. With those car tires I couldn't hit more than 80 mph without spinning the tires.
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