[Fot] Close ratio gears

Fri Jan 20 13:29:25 MST 2023

Rick,
       Thanks for the reply.  Yep, I've put way too many hours into gear
calculations/thrust plots/road speed in each gear etc to get to this point
and backing it all into existing TR gearbox bits to determine what's
possible.
Yes, 4th remains 1:1, due to gearbox design.  If you map out the existing
close ratio set we are discussing here, there's still quite a big torque
drop off between gears, at least with the torque curves I'm used to.  Some
small changes to the ratios should make a very nice improvement.

By leaving 1st gear as is, it allows me to (hopefully) keep the cost within
a reasonable distance of the TT2210 gearset that we've recently lost supply
of. If I were to make changes to 1st gear ratio, that changes the price
point significantly!
Added bonus if you are a lazy heathen like me- nice and easy to drive the
car onto the trailer at the end of the weekend without hurting the clutch :)

I see my option as an improved alternative for the more typical vintage
racer who's happy using 2nd/3rd/4th and not changing gearbox
ratio's between races, and with your new synchro's should give renewed life
to the ole TR gearbox in racing.

The racers who wish to have 1st gear options will be better served with a
dog box or some other gearbox conversion, in my opinion.

Jason

On Fri, Jan 20, 2023 at 3:03 PM Rick Parent <rick.parent at att.net> wrote:

> Hi Jason
>
> That's great news! I think you may want to consider making a set of gears
> with first as a racing gear, I'm assuming 4th is 1:1 right?
>
> In my dog box's I would change gears for every track but did come up with
> a set ratio's that were a good compromise for someone who didn't want to
> hassle doing that based on all the track data I collected for the last 25
> years.
>
> What guys today are referring to as close ratio are some changes from the
> factory that may be better than stock but certainly not optimal for racing
> by any means.
>
> Please see the pdf's below, you can recalculate based on your inputs what
> work best for you on any gear calculator, I can't remember the name of the
> one I used but it was free online. I'm always happy to help if you need
> some other input.
>
> Rick Parent
>
> "*Doing the right thing is always the right thing, regardless of
> consequences*"
>
>
>
> On Friday, January 20, 2023 at 11:17:35 AM MST, Jason Sukey via Fot <
> fot at autox.team.net> wrote:
>
>
> Amici,
>         I'm working with a gear manufacturer on another option for close
> ratio gear sets for the big TR gearbox.  Initial design is for 2nd/3rd/4th
> to be close ratios (similar to what we are used to with the discontinued
> close ratio set), but the 1st ratio will be stock.  I suspect few road
> racing users are using 1st gear other than to get moving from the grid
> (ultra close ratio dog box users excluded).
>
> These will be  a "semi-helical" type gear, they won't be quiet like street
> gears.
>
> I don't have any hard numbers yet, the cost will certainly be a bit higher
> than the $600 sets we are used to, but a fraction of the cost of converting
> to a dog box.
>
> If things work out, I'll have a sample set in my racecar to test this
> summer.
>
> I'll keep FOT posted.
>
> Jason Sukey
> JS Performance Motoring, LLC
>
>
>
> On Fri, Jan 20, 2023 at 11:27 AM Bob Kramer Gmail via Fot <
> fot at autox.team.net> wrote:
>
> FWIW when calculating demand, I have bought 5 sets over the years. I’ve
> sold I few racecars over the years and some has CR sets. The set in my TR4
> us the most abused set and us still going strong. It does talk back at
> times, but they seem to hold up well.
>
> Sent from my iPhone
>
> On Jan 17, 2023, at 9:37 PM, DAVE HOGYE via Fot <fot at autox.team.net>
> wrote:
>
> 
> I'm using one.
> Wouldn't mind having another one.  Should have bought one when they were
> available at $600 or what ever it was.
> It's difficult to understand the reasoning behind not letting a more
> modern and available option to be used.  Toyota, Miata, T5 or what ever.
> Had I known that to date, absolutely no tech inspector would ever even look
> at or question my gear box or if I was using rack and pinion steering, I
> may have gone that route in the first place.  I don't think these items
> make the car or driver go much faster and spoil the competition.  Some are
> using these already anyhow.  I've heard the argument many times, that
> basically the original option with over-drive had 7 gears.  Why wouldn't
> any 5-speed be allowed.  Thegridsaregettingsmaller.com.  I like to add
> .com. to anything.  And, I'mnotsleepingverywellthesedays.com.  That sort
> of thing...com.   Gdamn$85sycrorings.com.  Hehehe.com.
> Dave H.
>
>
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