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Wayland
Samba Member
Joined: December 29, 2005
Posts: 498
Location: Lasqueti Island B.C.
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 Posted: Mon Oct 21, 2013 4:43 pm Post subject: |
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| I don't have a tach, but I believe 4th is about 3800rpm with a stock bignut. 35mph is the usual 3rd/4th shift point on a bignut too. |
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Culito
11010101
Joined: December 07, 2006
Posts: 5866
Location: Columbia Missourah
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| Posted: Mon Oct 21, 2013 4:50 pm Post subject: |
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Ok then.
I forgot to mention that I am running 205/75/15 Grabbers. Reading up, I thought that I could actually go faster than 60 with a big nut.
_________________
Copyright CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug
| johnnypan wrote: |
| ...dont pay no attention to Culito,he's a cornhole.. |
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Wayland
Samba Member
Joined: December 29, 2005
Posts: 498
Location: Lasqueti Island B.C.
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| Posted: Mon Oct 21, 2013 5:02 pm Post subject: |
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| You should be able to go quite a bit faster than 60 with a stock bignut, if you wanted to. 65 was considered the "max speed", but even with a stock motor a bignut-equipped bus will go 70+ |
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CoastalAirCooledVW
Samba Member
Joined: September 02, 2012
Posts: 1882
Location: Mckinleyville, CA (Humboldt County)
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| Posted: Mon Oct 21, 2013 6:15 pm Post subject: |
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| Culito wrote: |
Ok then.
I forgot to mention that I am running 205/75/15 Grabbers. Reading up, I thought that I could actually go faster than 60 with a big nut. |
My big nut trans (unknown internals) with grabbers CAN go 65 and probably 70 but it doesnt sound happy. I usually go 55-60 with my set up. Some say you should be able to cruze at 65 but it doesnt sound healthy to me. My 2 cents
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1966 Velvet Green Standard |
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Wayland
Samba Member
Joined: December 29, 2005
Posts: 498
Location: Lasqueti Island B.C.
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| Posted: Mon Oct 21, 2013 6:43 pm Post subject: |
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| CoastalAirCooledVW wrote: |
| Culito wrote: |
Ok then.
I forgot to mention that I am running 205/75/15 Grabbers. Reading up, I thought that I could actually go faster than 60 with a big nut. |
My big nut trans (unknown internals) with grabbers CAN go 65 and probably 70 but it doesnt sound happy. I usually go 55-60 with my set up. Some say you should be able to cruze at 65 but it doesnt sound healthy to me. My 2 cents |
Agreed. The owner's manual states that 65 is the maximum and cruising speed, and I've had my bus up to 70 a few times. I much prefer 55-60 though. I notice my oil temps climb quite a bit at sustained speeds of 60 and above. |
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ezcamper
Samba Member
Joined: January 10, 2001
Posts: 897
Location: Atlantic Beach, FL
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| Posted: Mon Oct 21, 2013 8:30 pm Post subject: |
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I hit 73mph on flat land with a stock big but and 1600dp. GPS verified. It was scary. 60mph is comfortable. Stock 14" wheels... 195r 14 tires.
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I make HWE style roof racks, Jim-Dandy racks, SO-33 metal parts, Dormobile racks, HWE style ladders, engine crank start handles, Westy rack tags, Binz tags, Sundial badges, State of California tags, steering lock electrical covers and single / double cab gate latch friction blocks.
instagram is http://instagram.com/bullidriversteelworks |
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Chris Paterson
Samba Member
Joined: February 21, 2010
Posts: 1068
Location: Newbury Park, CA
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| Posted: Mon Oct 21, 2013 8:46 pm Post subject: |
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| ezcamper wrote: |
| I hit 73mph on flat land with a stock big but |
hehe funny typo 
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- Chris
58' PGSG |
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mandraks
Samba Member
Joined: November 28, 2004
Posts: 7050
Location: Lawrenceville, Ga
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| Posted: Tue Oct 22, 2013 9:50 am Post subject: |
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| ezcamper wrote: |
| I hit 73mph on flat land with a stock big but and 1600dp. GPS verified. It was scary. 60mph is comfortable. Stock 14" wheels... 195r 14 tires. |
what made it scary? the noise?
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Uli
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'53 3-Fold Oval, L35 Metallic Blue, looking for a narrow hatch panel |
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Culito
11010101
Joined: December 07, 2006
Posts: 5866
Location: Columbia Missourah
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| Posted: Tue Oct 22, 2013 3:32 pm Post subject: |
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60mph is 4000 rpm for me. 3800 @ 65 would be great...
_________________
Copyright CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug
| johnnypan wrote: |
| ...dont pay no attention to Culito,he's a cornhole.. |
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ezcamper
Samba Member
Joined: January 10, 2001
Posts: 897
Location: Atlantic Beach, FL
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| Posted: Tue Oct 22, 2013 5:20 pm Post subject: |
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| mandraks wrote: |
| ezcamper wrote: |
| I hit 73mph on flat land with a stock big but and 1600dp. GPS verified. It was scary. 60mph is comfortable. Stock 14" wheels... 195r 14 tires. |
what made it scary? the noise? |
Yeah the noise and it just seemed really fast in a bus.
_________________
I make HWE style roof racks, Jim-Dandy racks, SO-33 metal parts, Dormobile racks, HWE style ladders, engine crank start handles, Westy rack tags, Binz tags, Sundial badges, State of California tags, steering lock electrical covers and single / double cab gate latch friction blocks.
instagram is http://instagram.com/bullidriversteelworks |
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joe cool
Samba Member
Joined: August 20, 2006
Posts: 1259
Location: Yolo County CA
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| Posted: Tue Oct 22, 2013 9:59 pm Post subject: |
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Read it and weep. Speedo is GPS verified accurate. 1600sp / big nut RGBs / late model transmission / 15" wheels. Took several miles of flat interstate to get here. |
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GDOG57
Samba Member
Joined: March 19, 2006
Posts: 1065
Location: Gilbert,Arizona
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| Posted: Tue Oct 22, 2013 10:30 pm Post subject: |
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| Culito wrote: |
| 60mph is 4000 rpm for me. 3800 @ 65 would be great... |
I'd say you have a .89 beetle 4th gear instead of a bus .82.
Because i have the same setup as you 205/ 75/ 15 tires and 4.12 r/p and i cruise 65 at 3800 rpm.
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'57 oval window deluxe,Agave green(L240) 2276cc w/51.5 IDA's
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'69 Squareback (L30A Royal Red) |
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Riff Raff
Shivering Sambian
Joined: October 25, 2004
Posts: 3097
Location: Alberta
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| Posted: Wed Oct 23, 2013 6:37 am Post subject: |
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^^^That sounds likely to me.
A .89 fourth with a 4.125 R&P and a big nut will be within 2% of the final drive of a stock small nut.
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The greatest obstacle to discovery is not ignorance, but the illusion of knowledge
- Daniel Boorstin |
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Clara 
Samba Member
Joined: June 14, 2003
Posts: 12400
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| Posted: Wed Oct 23, 2013 7:18 am Post subject: |
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| GDOG57 wrote: |
| Culito wrote: |
| 60mph is 4000 rpm for me. 3800 @ 65 would be great... |
I'd say you have a .89 beetle 4th gear instead of a bus .82.
Because i have the same setup as you 205/ 75/ 15 tires and 4.12 r/p and i cruise 65 at 3800 rpm. |
lets do some math
mph = TD * RPM / (DR * 336)
TD with 205/75/15 Grabbers is 27.1" according to http://www.miata.net/cgi-bin/tirescgi
so DR = RPM * TD /(mph * 336)
= 4000 * 27.1/ (60 * 336)
DR = 5.377
so what gearing adds up to that?
Drive Ratio = 4th gear * r/p * RG
? .89 x 4.375 x 1.26 = 4.906 nope
? .89 x 4.375 x 1.39 = 5.41 ?
.82 x 4.375 x 1.39 = 4.987 nope
for 60mph at 4K rpms with that size tires look like your big nuts are small nuts and you have a bug 4th on top, just to mess with you.
(if my math is right and I plugged the right numbers in ?) |
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Culito
11010101
Joined: December 07, 2006
Posts: 5866
Location: Columbia Missourah
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| Posted: Wed Oct 23, 2013 9:18 am Post subject: |
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I do believe that the gearing is not as it appears for a stock big nut. I might be looking for another transaxle then...
Was there a special (one-ton, maybe) lower-geared big nut box?
Someone mentioned that I could slap the axles and big nut boxes on a later Super Beetle transaxle. Comments?
Thanks for the info guys!
_________________
Copyright CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug
| johnnypan wrote: |
| ...dont pay no attention to Culito,he's a cornhole.. |
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mandraks
Samba Member
Joined: November 28, 2004
Posts: 7050
Location: Lawrenceville, Ga
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| Posted: Wed Oct 23, 2013 10:49 am Post subject: |
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| Culito wrote: |
I do believe that the gearing is not as it appears for a stock big nut. I might be looking for another transaxle then...
Was there a special (one-ton, maybe) lower-geared big nut box?
Someone mentioned that I could slap the axles and big nut boxes on a later Super Beetle transaxle. Comments?
Thanks for the info guys! |
as far as i remember there was only one "special" transmission, the 1500cc motor, in the lower weight busses. they had longer gears 
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regards
Uli
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'53 3-Fold Oval, L35 Metallic Blue, looking for a narrow hatch panel |
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srfndoc
Samba Member
Joined: August 21, 2010
Posts: 3275
Location: SoCal
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| Posted: Wed Oct 23, 2013 10:53 am Post subject: |
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Mountain gearing?
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RPM=(MPH*336* (R&P*4th*1.26))/Tire Diameter in inches |
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mandraks
Samba Member
Joined: November 28, 2004
Posts: 7050
Location: Lawrenceville, Ga
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| Posted: Wed Oct 23, 2013 10:54 am Post subject: |
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| joe cool wrote: |
Read it and weep. Speedo is GPS verified accurate. 1600sp / big nut RGBs / late model transmission / 15" wheels. Took several miles of flat interstate to get here. |
reading it, not weeping, though, i have had several big nut busses, with 15 inch wheels and big tires that pegged the needle. They did get noisy though. Also with 1600SP, my favorite, but my 1500 could do it too. Any healthy big nut bus can do that. I used to run the stock dizzy with the rotor that had a 4800rpm rev limiter. They did make a 5400 rpm one too, but that was more for third gear
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regards
Uli
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'53 3-Fold Oval, L35 Metallic Blue, looking for a narrow hatch panel |
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mandraks
Samba Member
Joined: November 28, 2004
Posts: 7050
Location: Lawrenceville, Ga
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| Posted: Wed Oct 23, 2013 11:13 am Post subject: |
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| ezcamper wrote: |
| mandraks wrote: |
| ezcamper wrote: |
| I hit 73mph on flat land with a stock big but and 1600dp. GPS verified. It was scary. 60mph is comfortable. Stock 14" wheels... 195r 14 tires. |
what made it scary? the noise? |
Yeah the noise and it just seemed really fast in a bus. |
ezcamper, i recommend good shocks, good tires, lots of grease, adjust everything, and your bus will go 70 and 75, even in big wind gusts.
my favorite is: Konis up front, bilsteins out back, real bus tires, and a calm cool collected driver
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regards
Uli
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'53 3-Fold Oval, L35 Metallic Blue, looking for a narrow hatch panel |
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Clara
Samba Member
Joined: June 14, 2003
Posts: 12400
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| Posted: Wed Oct 23, 2013 11:17 am Post subject: |
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| srfndoc wrote: |
| Mountain gearing? |
There was a mountain geared big nut 1 ton RGB with 1.39 gearing.
I have never seen one in the USA, but evidently they were sold in Italy (alpine gearing)
You can take out the RGB fill plug, mark a tooth with a sharpie, and slowly turn the drum and count teeth. Then compare to this chart:
Double check your numbers. |
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