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Thread: Back to Spa-Francorchamps

  1. #31
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    Feb 2009
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    Yes day 2 was very cold with inconsistent grip - think snow, sleet, hail and rain during the day. I backed off a long way as it was just the type of day when I could end up in a wall if I pushed on. It was an ideal day for an all wheel drive car. The first day had better temps and was dry. Plenty of grip for me to push on. Unfortunately I got no video of my fastest session - the mic broke.

    The gearbox is a T-9 as the 6 speed box that used to be offerred are not as reliable now. Unfortunately it means the ratios as not as well placed and you are lugging the car around the circuit. I was generally going to 7K redline to change and it still was not great. It did not slow me down too much though I think. 124mph is about right for an 420R. An R300 is high teens mph speed at Spa. R500 is about 130-133mph area. 620R is getting well into the 135-140mph area. The striking thing about Spa is the sheer speed of it. So many 100mph+ corners. Average speed in a Caterham about 90mph. No wonder it is so thrilling for drivers.

    The data is from the GPS and internal altimeter. But for some reason it is always inconsistent at Spa. I think it is because of the high speeds and the 10khz refresh rates not always being quick enough.
    Last edited by Croc; 03-29-2019 at 11:57 AM.
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

  2. #32
    Join Date
    Oct 2006
    Location
    Cincinnati
    Posts
    3,489

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    Why isn't the 6 sp reliable these days??? I thought it was the gold standard for a Caterham?
    And what abt that new "project?" of yours?
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car

  3. #33
    Join Date
    Jul 2013
    Posts
    229

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    Project? Yes, we loves Project. Tell, Master Croc.

  4. #34
    Join Date
    Feb 2009
    Location
    The Frozen Northeast
    Posts
    456

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    Maybe he’s building a Storker,
    Any insight Suave?

  5. #35
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    NYC
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    Not sure about the 6 speed. BAT originally had no problems up to around 2016/7 area but then started experiencing a consistent reliability issues and so stopped using it in favor of the 5 speed or upgrading to the Sadev 6 speed - both of which are reliable in BATs use of them. Quality downgraded to meet price pressures?

    What project are you talking about?
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

  6. #36
    Join Date
    Oct 2006
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    Cincinnati
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    3,489

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    I was referencing the project that is no longer referenced in your description of your stable of vehicles. Must be super-secret!
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car

  7. #37
    Join Date
    Feb 2009
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    NYC
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    I think you are imagining things
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

  8. #38
    Join Date
    Oct 2006
    Location
    Cincinnati
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    I am obviously imagining things!
    Have you driven a Sadev 6 sp gearbox? How does it compare to the standard Cat 6sp? I see it costs 2x as much, unfortunately.
    I still occasionally miss downshifts in my 6sp Cat gearbox (thus, going into 3rd, from 6th, not 5th) with consequent potential catastrophic engine over-rev. So far I have caught it and corrected it before doing lasting engine damage. I know: time to learn to shift better. Never had a downshift issue w/the 5sp though, and assume it is impossible w/the Sadev as well?
    Last edited by Kitcat; 03-30-2019 at 08:19 AM.
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car

  9. #39
    Join Date
    Sep 2006
    Location
    Southeastern Pa.
    Posts
    2,764

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    Yellow has the 6 speed and Orange has the Sadev with Paddle shifter. I think the 6 speed is very good, and well spaced, it kind of just snicks in without alot of effort, maybe just a strech to get to 5th.

    The Sadev is brilliant on track once you get it going, it does NOT like to go slow. It likes full Revs. Downshifts automatically blip the throttle with a slight lift. Pretty fool proof unless you have a brain fart or a twitchy left finger that pulls the downshift paddle by mistake.
    Mangia bene, Ridi spesso, Ama molto, Guidare veloce

    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  10. #40
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    Feb 2009
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    NYC
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    The Sadev is definitely better than the Caterham 6 speed for "snicketiness" in finding gears, which in itself is better than the 5 speed.

    I had a 620R in Spain/Portugal for a week and loved the gearbox. No fancy pansy paddleshifters like Tom's car. Just a regular gear lever that you blip back and forth. Video at Estoril is here to give you an idea



    In this installation, clutch only used to get moving. High rev changes with no clutch. Downshift is no clutch. Depending on who you talk to, you should rev match downshift. BAT was telling me dont both to rev match (heel & toe) but some private owners were saying they do. Either way I am mechnically sensitive enough to keep an eye on my revs to avoid a mistimed downshift and rear wheel lock up.
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

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