[Fot] Lime Rock - Groups for Fri Qualifying/Practice and Sat Race

Sat Jun 7 15:12:29 MDT 2025

Henry,Thanks for the update, and plan.Looking forward to being there.MarkSent from my Galaxy
-------- Original message --------From: yellow04 <yellow04 at tr4racer.com> Date: 6/7/25  2:09 PM  (GMT-05:00) To: Mark Cook <mecook at mindspring.com>, FOT <fot at autox.team.net> Subject: Re: [Fot] Lime Rock - Groups for Fri Qualifying/Practice and Sat Race 
Mark,
At this point, we have 33 cars entered so we intend to run all Triumphs in the same group. If we get another 10 cars or so, we will be looking to move some of the slowest and/or fastest cars to appropriate groups.
The only caveat is cars running on slicks. If someone has no other option or insists on running slicks, they will be the first to get moved to the big bore group for all races leading up to the Kastner Cup race, but we all run together for the Cup on Monday after lunch.
In a couple weeks I will be focusing heavily on planning our weekend at Lime Rock, stay tuned for more as it becomes available!
Cheers 

On 2025-06-07 11:24, Mark Cook wrote:

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Henry,

Thanks for the info on gearing.  Video was helpful as well for having not ever driven Lime Rock.

Was looking at the Lime Rock HF43 posted race groups.  Question.  Will we run in Group 5 as a single group for Friday's practice/qualifying and Saturday's races as well as the Kastner Cup on Monday?  Or, run in multiple groups, like they have listed below (TR250/6 2500cc in the 2.5 Litre or Over 2 Litre as example)?   I assume multiple groups except for Monday’s event.

Thanks,

Mark Cook

https://limerock.com/events/historic-festival/hf-driver-information/

HF43 Groups and Classes

The following race groups are our tentative run groups:

Group 1 – Mid Century GT / Sportscars Under 2 Litre
    Under 1.3L
    Over 1.3L

Group 5 – Triumph Feature – Kastner Cup
    Triumph Under 1.6L
    Triumph Over 1.6L
    Triumph Over 2.2L

Group 6 – Tin Tops / IMSA RS / Under 2.5 Litre Cars
    Under 1.3L
    Over 1.3L

Group 9 – GT / Sportscars Over 2 Litre / Sports Racing Cars
    GT
    Sportscars
    Sports Racers

-----Original Message-----From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of yellow04 via FotSent: Thursday, June 5, 2025 12:23 PMTo: FOTSubject: [Fot] Gearing for Lime Rock

If this comes through twice, I apologize. Working through some technical
difficulties with my mail server.

I have been asked by numerous folks about what rear end gear to run at
Lime Rock. Several of our guys with a lot more laps at Lime Rock than I
do have chimed in, thanks everyone for your input. Sometimes a picture
is worth a thousand words, so here's my input.

https://youtu.be/xIg5KQwM-pw

I clipped a lap from my in-car camera from the 2024 Lime Rock Vintage
Festival. My tach is plainly visible and I added captions on what I am
doing with the gearbox. The lap shown is somewhere in the mid-1.05's.
The camera is one of those Go-Pro knockoffs, so the quality is junk, but
it got the job done. The sound was cut, if you heard what the camera
records for sound you would thank me!

The gearing I use in the TR250 is a 4:10 R&P, a Triumph gearbox with
close ratio gears, a stock Laycock overdrive and I am running on Hoosier
Speedsters with a diameter of 24.2 inches. My shift point is 6000. This
example should be easy to reference against your race car assuming you
are familiar with high school math!

This is the same setup I used in my old TR4 racer and the TR3, except my
4-cylinder racers use a Moldex crank, Carillos and a cam that ran to
7000. With the additional revs afforded by the billet bottom end, I
don't need the overdrive to enhance the top end. Again, it's all in the
math.

My line through Big Bend and the Uphill are not optimal, but that is a
conversation for another time.

Watch the tack twitch as I crest the Uphill, you know you did OK when
you get a little wheelspin there!

Hope this helps.

Henry Frye
KCup chair
860.508.3118
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