100 mph yes or no

[vw76westy]

So when I tell people that I have reached 100mph
In my 76 westy with a stock 2.0 engine & stock 091 tranny
They think im full of it

So one day while driving I pulled out my phone & got the proof

http://www.youtube.com/watch?v=mm8X0djmswk


the question is if the needle only goes to 90
do you think i was going just under 100 or just over 100mph
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[Randy in Maine]

What size tires?

[vw76westy]

at the time 195-70-14
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[WestyPop]

Really... the "typical" 195/70-14 would be turning about 3% more revs per mile than the oem-sized Vanco 185R14. Add to that the tendency of a lot of buses (& other vehicles, too) to be 2-3% optimistic, and it's anyone's guess... somewhere between 90 and 100mph.

In the interest of public safety, and your own, please don't feel you have to post a back-up video of your speedo reading an apparent 110mph, unless it's on a race track. (I'll be driving through that same section of I-10 today in a car that can easily break 150mph... but we'll be on cruise control @ 70mph. It's safer, I can't afford the ticket, and my wife won't divorce me!)
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(+ others)

[Randy in Maine]

A lot faster than I would want to be driving on substandard car tires.

[Mr. Loaf]

Let's see, my speedometer was calibrated by a speedometer shop as I knew it was off by 5 miles because of my tires size. Went out one day and did 109 mph at Thunder Valley. The Bus was still accelerating when I decided to let off the throttle.
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[Wildthings]

Comparing your speed to that of the trucks and other traffic, I would say about 75 mph.

[Derek Cobb]

I occasionally hit the high 90's in my 74 (according to my speedo) so I have little doubt that you could break 100 mph in your 2.0.

It never felt unsafe or squirrely, but I still wouldn't make a habit of doing it.

[fusername]

with my high output 2.0, in a full westy, it takes a full head of steam and a hill to hit 90, and at that point i am turning 5k. I have larger tires so the speedo is actually dead accurate, if it says 80 im doing 80, as checked by GPS. with smaller tires you would be closer to 6k to hit 100mph. thats pretty loud. and do you have a tach
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[Mal evolent]

Speed in MPH = RPM X LRTR / GR X 168

Where LRTR = Loaded Rear Tire Radius and GR = Gear Ratio ( 4th gear X R&P )

Diameter of a 195-70 R14 = 24.75"; radius is half of diameter

Speed in MPH = RPM X 12.375 / 4.56 X 168

Speed in MPH = RPM X 12.375 / 766.08

Speed in MPH = RPM X .01615367

Therefore

RPM = MPH X 61.905455 ( 1/.01615367)

So RPM would be 6190 at 100, with a 1:1 4th gear ratio.

A 76 should have a .889 4th gear ratio. If 4th gear is .889, it would be 5503 RPM at 100 MPH
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[fusername]

however those calculators I have discovered are WAAAAAY off all the time, they go off of ideal tire diameter, mfr always specks about .3 inches smaller than the actual size, and then you have shrinkage from the weight of the car flattening the tire. basicly those calculatos are useless. Ihave been trying to design a new trans based on my current tires and new ones, and it has always been off by HUGE amounts.
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[raygreenwood]

So I'm just looking at this. You need to post your 4th gear and final drive ratio.....and your rpm at 100 mph.

Your 195/70-14's have a circumference of 6.479' in diameter. With 5,280 feet per mile that would be 814.9 rear wheel revs per miles...at best with no sidewall crush or slippage. That means at 60 miles per hour your rear wheels ate turning at 814.9 revs per minute.

At 100 mph....thats 1.666 miles per minute at 1303.84 wheel revs per minute.

I have no idea what your 4th and final is. Just pulling out of my haynes for 73 and later bus....lets call it for the moment a .89 4th and a 1:4.85 final drive?

So for every 1 rev of the wheel it takes 4.85 revs of the engine. Before 4th gear reduction it would mean .....at 100 mph your engine is turning 6,323.6 rpm. Reduce input by the .89 = your engien was turning at 5,628 rpm.

Being that the 2.0 bus engine put out marginally more ...and possibly less...hp than the 1.7L in my 412....and the bus has 2.3 times the weight, 12 times the surface area and the aerodynamics of a brick......I doubt you are at 100 mph with a stock engine.

Is it possible to be at 100 mph in a VW bus?...easily! They have been doing it on the autobahn for ages.
There was an article years ago about the fleet of vanagons Porsche had in their stable with 6 cylinder engines that they used to shuttle their execs to group meetings at 100+ mph.

It is actually common for speedos like we use in VW's to read way off as they get toward the end of their scale. I'm betting from the video that you are at about 80 mph. Ray

[bsairhead]

From looking at the video it looks like your tach. is reading under 4000, that makes no sense. But looking at the speed that your overtaking people, except the guy in front of you I'd say your doing close to 90

[borninabus]

"i ain't got no crystal ball" either. but i don't envision your engine lasting very long.
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[vw76westy]

well anybody who drives on the 10fwy threw the
palm springs area of CA
knows that the avaverge car speed is 75-80 mph
and that most cars in the fast lane are going 85-90mph
(i ask anyone from the palm springs area to confirm or deny this)

my speedo has been checked a few times at speeds up 55mph
& it was dead on every time

twice it was compared to the speedo of a friends car at 75 mph
while driving on the freeway & it was spot on

[Derek Cobb]

Get a GPS and use that to settle this bickering contest. Most of them will give a MPH output independant of the tire size, final drive ratio, speedo inaccuracies, tachometer miscalculations, aerodynamic anomolies or ego satisfying inflations.
You don't actually have to try and crack that 100 mph barrier again to prove or disprove anything, just roll it up to 80 or 90 and compare the readings. Either they are the same or they aren't.

[vw76westy]

My original reason for starting the thread was
to discuss how accurate the Speedo is past 90mph
if the needle moves 3/4 of an inch for every 10mph (more or less)

then that would mean that when the needle is pointing to the vdo
im going more than 100mph

I believe my Speedo is accurate up to 75-80mph
as I compare it to friends & family cars on every road trip
& on the track at fontana & irwindale speedways

im used to this denial from people
(Especially my non-vw family & friends)
until they get in & we go somewhere
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[raygreenwood]

[Derek Cobb]

[vw76westy]

on any given day i can reach 90 mph on a flat highway
& i did take several video clips from LA to palm springs
going 90 & flying past 65-70 mph traffic
(if you want to diesect the video's for more clues of my speed
ill post these clips later)

but every time im on this piece of highway
im able to make the needle point to the vdo
going east only

when im going to LA on this part of the 10fwy
my top speed is 65-70 & it feels like im going up hill

i know that the wind is helping & that the road has to be
at a slight (unnoticable) down hill
because 85-90 is my average top speed
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,