Date: Mon, 16 May 2011 19:44:14 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Tire question
In-Reply-To: <C9F6FB5C.11C7A%mwmiller@cwnet.com>
Content-Type: text/plain; charset="iso-8859-1"
The Syncro transmission really is the 5 speed with really low reverse and
forward creeper along with the shaft extension to run the front axle. A
taller R/P is what makes all the gears taller in the two wheel drives. While
the TDI does make good torque at lower speeds you both torque and speed to
make horsepower and at speed you need horsepower to overcome wind
resistance. Also keeping the engine under that torque stress increases NOx
emissions and probably will even shorten it's life.
As for rubber gearing a lot can be changed by tire size although 15" wheels
and room in the wheel wheels can be limiting. Dont look at the change in
diameter but rather the change in circumference or use the revolutions per
mile charts.
Avoid the temptation to gear the TDI down too low.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike Miller
Sent: Monday, May 16, 2011 7:04 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Tire question
The word was that the taller R&Pšs were NLA pretty much. I donšt know about
the problems getting going. The TDI has serious low end torque. But the
brakes? I have G60s in the front and Audi 5000 turbo rear disks in the back
so I should be good.
The real answer is the 5 speed transmission but I donšt have the courage to
ask how much one of those is. Do they fit in syncros?
Mike
On 5/16/11 3:53 PM, "Jake de Villiers" <crescentbeachguitar@gmail.com>
wrote:
> If you could fit tires that big under your van, which you can't, you'd
find
> yourself with seriously under-performing brakes and you'd probably have to
fry
> the clutch getting it underway too... A taller third and fourth is a more
> intelligent solution, along with a taller R&P.
>
> On Mon, May 16, 2011 at 3:25 PM, Mike Miller <mwmiller@cwnet.com> wrote:
>> Thanks
>>
>> Right now the hope is for a TDI. Price of the labor for conversion is the
>> same, about, for either a TD or a TDI and I've had a TDI and liked it.
>>
>> I guess the Tire Rack would know this, and then I can calculate the
percent
>> change in rpm. The gearing change is 25% and I kind of doubt tires can
make
>> that much difference but maybe?
>>
>> Mike
>>
>>
>> On 5/16/11 2:43 PM, "Scott Daniel - Turbovans"
<scottdaniel@TURBOVANS.COM>
>> wrote:
>>
>>> > hi ..
>>> > 'which diesel' engine is a factor...
>>> >
>>> > a strong running tdi ?
>>> > or a conventional pre-chamber style engine ...1.9 TD at least I would
>>> > expect ?
>>> >
>>> > if running a conventional pre-chamber TD engine ..
>>> > those are 5,000 rpm engines .........and more or less like the stock
>>> syncro
>>> > gearing.,
>>> >
>>> > on the other hand ...a tdi will have more power at lower rpm, and for
>>> those
>>> > you want higher gearing for sure in 3rd and 4th.
>>> >
>>> > depending on how wild you want to get, some pretty large and tall 15
inch
>>> > tires will fit on your syncro van.
>>> > If the trans does not need rebuilding current..
>>> > the less expensive route for now is to play with 'rubber gearing'
>>> > improvements.
>>> >
>>> > for a stock 75 hp 1.9 TD AAZ engine ..
>>> > stock syncro gearing could be all right .................and it
depends on
>>> > *what use* you have in mind ..
>>> > from dead slow rock crawling, to mud prowess, to highway cruising..
>>> > that needs to be spoken to also, for people to be able to make
intelligent
>>> > comments about gearing and tire changes.
>>> >
>>> >
>>> > ----- Original Message -----
>>> > From: "Mike Miller" <mwmiller@CWNET.COM>
>>> > To: <vanagon@GERRY.VANAGON.COM>
>>> > Sent: Monday, May 16, 2011 2:13 PM
>>> > Subject: FW: Tire question
>>> >
>>> >
>>>> >> Subject: Tire question
>>>> >>
>>>> >> Vanaroonies,
>>>> >>
>>>> >> I feel the list has been too quiet lately so I thought I'd bring up
a
>>>> tire
>>>> >> question.
>>>> >>
>>>> >> Converting a van, 87 syncro, to diesel [if the money falls from
heaven,
>>>> >> that
>>>> >> is]. The advice is to change 3rd and 4th so that the diesel operates
in
>>>> >> the
>>>> >> right rev range on the highway.
>>>> >>
>>>> >> This will increase the gap between 2 and 3, which is already too
large
>>>> >> really.
>>>> >>
>>>> >> So I wondered how much the revs could be decreased at highway speeds
>>>> [and
>>>> >> all others] using the tallest tires? I have 15" rims and since it's
a
>>>> >> syncro
>>>> >> and a westy I need Light truck tires.
>>>> >>
>>>> >> Any ideas?
>>>> >>
>>>> >> Mike
>>>> >> Flame suit on
>>>> >>
>>>> >> ------ End of Forwarded Message
>
>
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