MSA 2018 Tyres List

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Post by CNHSS1 » Sun Jan 28, 2018 3:52 pm

I'll give 2018 a go with handicapping and see how competitive a hi power/low weight car is, be interesting. Alternative is go National and scratch of course. Excites by 2018 season :D :D :D


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Post by swoakes » Sun Jan 28, 2018 4:02 pm

The one thing that CM lacks is any recognition of those who go the fastest irrespective of handicap.

Maybe we should consider suggesting a system similar to "Fastest Scim" prize after we have been in CM for a year or too. At the moment there is little incentive in CM to create a monster high power low weight car because it seems unlikely to do well on handicap. It will be interesting to see how you and Turbster go in your cars.


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Post by CNHSS1 » Sun Jan 28, 2018 4:10 pm

Paul's car will be competitive in sure, mine we will have to wait and see. My ultimate aim is 450-500hp and as closer 700kg as I can get, and handicapping won't cope with that, but thats my issue not the scoring system. I'd rather see a healthy number of Scims competing than go to scratch scoring. 2018 will be a great year I'm sure 8)
Last edited by CNHSS1 on Thu Feb 01, 2018 8:35 pm, edited 1 time in total.


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Post by Corky » Thu Feb 01, 2018 5:22 pm

I've been having a think about "competition" and for this year I'm just looking at my scratch times. New car and all that, bench marking against the Sabre etc. If I manage to feature in a reasonable championship position at the end of the season it'll be a bonus. I don't want to go slower by moving down to 1A :( I want to go quicker on 1B :D and sod the consequences :lol: .

So a fresh set of R888 SG are going on the car. Great to see SG spec' freely available again. They are rated B for wet, which should be a great improvement over the E rated R888R I used in 2016/17, and they should be equal to or slightly better in the dry too.


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Post by philhoward » Thu Feb 01, 2018 5:27 pm

Going for fun rather than "championship by spreadsheet"? :D


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Post by Corky » Thu Feb 01, 2018 5:33 pm

Pretty much :lol:


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Post by swoakes » Thu Feb 01, 2018 5:54 pm

philhoward wrote:
Thu Feb 01, 2018 5:27 pm
Going for fun rather than "championship by spreadsheet"? :D
That's the only downside with us joining CM. We are in the CM class on the day and they put the cars in handicap order for the class prizes by having someone with the spreadsheet on the day.

At present they don't have any prizes for the fastest cars on raw time (like the SSSC Fastest Scim award)


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Post by scimjim » Wed Mar 21, 2018 10:03 pm

As most know, I tried to do a back to back comparison between RS3 and R888R yesterday and I thought it would be very close.

My best on R888R was 71.3, my best on RS3 was 73.8 and I felt that my tyre pressures were a little high, so may have gone a bit faster with the RS3.

If my maths are correct, my base timing algorithm is:

BHP/TON (118BHP @ 945.5Kg inc driver) = 124.80

LOG(350*124.8)/LOG(350*500)=0.885 = 88.5%

For RG:

Tyre category 1 (list 1a) = 0% = 88.5%

Tyre category 2: Option to run both List 1A and List 1B tyres (excluding rally tyres) +2.5% of base timing algorithm = 91%

so in category 1 I made 73.8 making my algorithm time 65.3

but in category 2 I made 71.3 which is an algorithm time of 64.88

so less than half a second in it (see second point below) - and I reckon the RS3 may have had that in them.

The regs say:

Competitors are allowed one upward tyre category change per season.

Competitors wishing to change to a higher tyre category mid-season must notify the Championship Organiser in advance as specified in section 1.4.2. (1.4.2 says: If, during the year, a competitor changes cars or makes any modification to the entered car which affects the car's timing algorithm, the changes must be notified to the Championship Organiser before the competitor's next event so that future points scoring can be based on the correct timing algorithm.)

Competitors are not permitted to change to a lower tyre category than the one they used at their first event of the season.

One suggestion was to declare category 2, then you can run 1a if it's really wet (still with 2.5% penalty) - if you declare category 1, you can't just change to category 2 at an event because it's hot.

But - I'm sticking with category 1 with the option to go up to category 2 (before the event) if I decide to run 1b - and the option to go back down to category 1 if it turns into the wettest season on record (again).

Anyone see any errors in my maths or reading of the regs?

2 further points:

1. The racechrono app kept losing signal (repeatedly at the top corner) and had a lot of lag (consistently recorded times 3-4 secs under Nicks/Craigs) but with a better signal and some playing with settings could be very good.

2. My GoPRO battery died at critical points (because I left it turned on while I changed tyres or stopped for lunch :oops: - must get that remote control) but where I could align runs, Nicks/Craigs times were all within 1.3 seconds (generally 0.5s or better) of the video times.


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Post by scimjim » Wed Mar 21, 2018 10:07 pm

turbster wrote:
Thu Jan 11, 2018 10:22 am
efi_sprintgte wrote:
Thu Jan 11, 2018 10:00 am
I’m not sure I would want 850kgs being powered by 350 horses on anything less then 1cs??
Where's your sense of adventure?? :lol:

It's just a thought, 2.75% is a lot of lap time when you've already got a serious handicap for the above. I'm just wondering if that would balance things up as my power to weight would be best suited to slicks and some aero to overcome the handicap?

I'm not bothered about being the fastest outright, I want to be competing for 25 points every round ideally..
having just read the regs (a few times) - surely as your car isn't RG, you automatically have a 2.75% tyre handicap (or 3.5% on slicks)?

Roadgoing Cars
Category 1: “OE style” crossply tyres OR List 1A tyres +0%
Category 2: Option to run both List 1A and List 1B tyres (excluding rally tyres) +2.5% of base timing algorithm

Non Roadgoing Cars
Category 3: Option to run List 1A, List 1B and List 1C (excluding rally tyres) + 2.75%
Category 4: Option to run any List 1A, List 1B and List 1C, in addition to slick, race wet and rally tyres +3.5% of base timing algorithm.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
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Post by Nick » Thu Mar 22, 2018 8:30 am

I think CM essentially has been a Roadgoing Championship. Proper Modsports, as per you guys, has not been the norm for them. Clearly you need to clarify the above with Steve Cox.

History suggests you will only get your tyre handicap back if the extra grip is needed, probably about 200 bhp for an SS1. Gary Cox ,mega at Prescott, never got the handicap back on his GTE with about 180 horses, Craig's Sabre was lethal (with all respect Craig) on !a's.

My racechrono was also 2/3 secs out.


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