The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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PostPosted: Sun Mar 11, 2007 8:51 pm 
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Future Club member hopefully!
Future Club member hopefully!

Joined: Tue Oct 03, 2006 8:35 pm
Posts: 833
Location: coventry
never done a trackday but been down to a couple to check them out and heard it said that thje fuel lays in the tanks too long.


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PostPosted: Sun Mar 11, 2007 8:55 pm 
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Location: Winscombe, North Somerset, England
Well if anyone is around tomorrow, bring a helmet & I'm sure I can take you out a couple of times...cheap day out!

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Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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PostPosted: Mon Mar 12, 2007 10:32 am 
Mart,
What tires and size including rim size, rad or diagonal do you run, just qurious.

Hans


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PostPosted: Mon Mar 12, 2007 11:31 pm 
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Hans - I run Yokohama A038 185/60/13 on Compomotive 5 spoke 6x13 wheels.

_________________
Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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PostPosted: Mon Mar 12, 2007 11:43 pm 
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Joined: Tue Oct 03, 2006 4:50 pm
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Location: Next to my Computer
How did it go?


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PostPosted: Mon Mar 12, 2007 11:51 pm 
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Bloody excellent Dave! :jump4joy:

I'll have to give a bit more detail tomorrow as I'm absolutely knackered. Got up at 4:45am, left home at 5:30am. Got back at 19:10pm. Then I had to go Bowling. :-({|=

_________________
Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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PostPosted: Tue Mar 13, 2007 8:48 pm 
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Location: Winscombe, North Somerset, England
As I said it was a great day, well organised & the weather stayed fine and my Sprint got me there & back in one piece (always a bonus).

After signing in and getting our numbers & wrist bands we had the usual pre-track briefing. The day was divided into three separate sessions; Lotus on Track had the first session with MGs on track taking the other two, ClubTriumph members mingled with the MGs. All sessions lasted 20 minutes and believe me, driving a circuit for 20 mins at a time is pretty knackering. I think it's more mentally tiring than physical.

The first session for everyone was to follow a pace car around the circuit for three laps at no more than 50 mph. The pace car would follow the racing line & the theory was that everyone would follow that line, but by the time it got towards the rear of the convoy...well lets say it's a bit like Chinese whispers. Anyway, that took up most of the first session but we did manage a couple of flying laps once the pace car pulled into the pits.

I found the circuit to be quite intimidating to start with as it’s quite wide & I felt a bit lost at times on that vast circuit of over 3 miles long. After the first proper session I was a bit disappointed as I felt, and probably was, all over the place, either braking too soon or too late & getting the race line completely wrong. But that was short lived. The next session I had learned by my mistakes & determined to get it right I was gradually carrying more speed through the twisties. What a contrast that session was to the previous & I got back to the garage with a big grin on my face. From then on it was pedal to the metal all the way, well quite a lot anyway. I did have a couple of moments; both at Vale. The first one I just out braked myself & had to run onto the grass, a bit bumpy but still, the second, after trying to keep up with the Herald estate that I’d let pass me a lap ago, I took the corner too fast & spun.

The best session was the last one. I lined up behind Jon Jackson (Sierra brake man) in his Sprint. It was brilliant, Jon was off like a bat out of hell & caught me napping but I soon caught up once he hit traffic. Then it was a case of scything through the slower cars (well actually, waiting ‘til they let us pass) MGFs, Midgets, even a Rover 75 V8 supercharged estate thingy (must admit, that V8 sounded awesome).

Ah! Well, back down to earth now, which reminds me, Life on Mars is just about to start.


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_________________
Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


Image


Last edited by Mad Mart on Wed Mar 14, 2007 1:48 pm, edited 1 time in total.

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 Post subject:
PostPosted: Wed Mar 14, 2007 12:37 pm 
I don't believe a word of it :wink: , got any video footage?

Cheers
Mark

Edit: Just went to General forum and found the answer :oops:


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 Post subject:
PostPosted: Sat Mar 17, 2007 11:01 am 
Quote:
.. I have a 4.1:1 diff...
Sorry, was reading through this topic and though I might as well learn something..

What does that actually mean ? :roll:

Phil


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PostPosted: Sat Mar 17, 2007 11:17 am 
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Joined: Wed Oct 04, 2006 9:49 pm
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Location: Sutton,Surrey.
Standard Sprint diff is 3.54:1 Ratio

4.1:1 is a different ratio diff that will help the Sprint pull out of corner's quicker.
The downside is a slower top speed.
Not that you need much top speed on the track.

_________________
2009 Mini Clubman Cooper S Daily Driver.
1980 Dolomite Sprint with a touch of BLTS
Balanced Lightened and Tweaked 13B Rotary and SuperCharged.
Back in my possession 22 September 2019.
Rebuilding the Sprint time taken so far, 111Hrs@15/12/2020
212Hrs @31/12/2021
352 @ 28/11/2022
455Hrs @ 20/10/2023
480Hrs @ 14/03/2024
This is time taken at the Sprint not necessary time worked.

Working on a ratio of just 7Hrs a day not including driving to the Sprint.
That equals to 68 days that doesn’t include weekends.
Member TDC no 0471

Project 13B Sprint now back on.


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PostPosted: Sat Mar 17, 2007 1:05 pm 
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Joined: Tue Oct 03, 2006 5:42 pm
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Location: Forest of Dean
.....

The ratio is the number of input turns to output turns of the differential. For example with a 4.11:1 when your prop shaft is turning at 4110 rpm your wheels will be turning at 1000 rpm. With a standard sprint diff when the wheels are at 1000rpm the prop shaft is only doing 3540 rpm. I won't go into the details of the engine to prop ratio except that in 4th gear it is 1:1; engine rpm = prop rpm.

So a lower ratio diff gives a more leisurely cruise as engine speed is lower for a given wheel rpm. A higher ratio makes the car accelerate better because you have lower gears. The difference between 4.11 and 3.54 is 14% We all know you change down a gear to get better acceleration to overtake someone. Marts car permanently in 14% lower gear than standard.

Hope that makes sense!

Tinweevil

_________________
1978 Pageant Sprint - the rustomite, 1972 Spitfire IV - sprintfire project, 1968 Valencia GT6 II - little Blue, 1980 Vermillion 1500HL - resting. 1974 Sienna 1500TC, Mrs Weevils big brown.


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 Post subject:
PostPosted: Mon Mar 19, 2007 8:37 am 
Standard is 3.45:1

David


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 Post subject:
PostPosted: Mon Mar 19, 2007 9:10 am 
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...and my ratio is 4.1:1 not 4.11:1 :lol:

_________________
Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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 Post subject:
PostPosted: Mon Mar 19, 2007 12:30 pm 
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Future Club member hopefully!
Future Club member hopefully!
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Joined: Tue Oct 03, 2006 5:42 pm
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Location: Forest of Dean
I sit corrected :lol:

Tin

_________________
1978 Pageant Sprint - the rustomite, 1972 Spitfire IV - sprintfire project, 1968 Valencia GT6 II - little Blue, 1980 Vermillion 1500HL - resting. 1974 Sienna 1500TC, Mrs Weevils big brown.


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 Post subject:
PostPosted: Mon Mar 19, 2007 1:00 pm 
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Location: Winscombe, North Somerset, England
I'm glad most people understand the smileys. :D

_________________
Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


Image


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