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Thread: CR500 to ZZS

  1. #11
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    Quote Originally Posted by JohnCh View Post
    I thought the CSR used 245 rears, but the S3/SV used 215? Does that significant difference in front & rear width result in a lot of understeer?

    -John
    Not with Vlad - he usually exits backwards.

    Current standard sizes for a S3/SV are 6 wide or 8 wide. CSR standard rear was 8.5 for my silver CSR. You can get 9 wide rears for a CSR and they do exist for a SV or S3 even though not standard. Vlad's set up is fairly common.

    I run a stagger set up on the 420 - 6x13 front and 8x13 rear - works quite well. If I was below 200hp I would go a square set up for wheel widths.
    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 SS Group A
    1985 Holden Commodore Group A
    1982 Ferrari 400i
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic
    and another project car coming....

  2. #12
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    Apr 2013
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    Quote Originally Posted by panamericano View Post
    You might also think about trimming off some of the excess bolt length. I did so, not for the tires, but for using tire bonnets (straps) which caught on the bolts, between the tire and fender.
    The ZZS are larger diameter so I may need to do it for tire clearance. I don’t trailer my car so I don’t have the strap issue. Instead I got to drive 250 miles home from NJMP with dodgy brakes.
    Last edited by Black Hole; 02-08-2020 at 07:41 PM.
    Jay

  3. #13
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    May 2018
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    Quote Originally Posted by Croc View Post
    Not with Vlad - he usually exits backwards.

    Current standard sizes for a S3/SV are 6 wide or 8 wide. CSR standard rear was 8.5 for my silver CSR. You can get 9 wide rears for a CSR and they do exist for a SV or S3 even though not standard. Vlad's set up is fairly common.

    I run a stagger set up on the 420 - 6x13 front and 8x13 rear - works quite well. If I was below 200hp I would go a square set up for wheel widths.
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    I'm 99% certain the staggered setup is stock on SLR packages but square setup was available as well and came on other trims throughout the years. The 245's the came off the back were from 2001 which is also the year of the car. I'm certain there were stock.

    With that said I've never spun the car! From what I can still recollect out of the ton of different experiences over the adventurous period of tracks last year my car tends to understeer and I'm happy with that. Sway bar is in the back is likely in the middle setting too.
    2001 Caterham Superlight R

  4. #14
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    Staggered is stock; I'm just surprised by the delta. 185/245 is more extreme with my ass-engined car. Even the 620R -- which by all accounts is reasonably powerful -- only has a 185/215 stagger.

    -John
    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

  5. #15
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    Quote Originally Posted by Vovchandr View Post
    ...my car tends to understeer and I'm happy with that. Sway bar is in the back is likely in the middle setting too.
    I suspect the reason for that is your car was corner weighted for 2 people in it and you track with just one on board.
    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 SS Group A
    1985 Holden Commodore Group A
    1982 Ferrari 400i
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic
    and another project car coming....

  6. #16
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    Apr 2013
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    I got my ZZS and had them mounted and as expected they do have some minor clearance issues. The good news is they do not interfere with the stay, which was one concern based on their larger size and minimal clearance, but they do rub (lightly) on one fender The tire tech said they were a real bitch to get on the rims.


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    So the question is what is the best tactic to solve this problem. I can try and bend the wing stay (cold or heated), I did a test try a while ago and it seems pretty stiff.

    I could move the wing to outboard as it is not centered and I think that would work. i would have to deal with the holes in the fiberglass.

    The final solution would be to buy the new stays as they note on the Caterham Parts website that they are for ZZS/R tires. I suspect I would have a hole alignment issue with the wing holes so I would probably be just as easy to move the wing on the existing stay.

    Its unusually warm (a nice balmy 44 deg F at the moment) in the NE so I will probably try the cold bend and if that works I exercise the car. I assume these tires have minimal grip at these temperatures!
    Attached Images Attached Images  
    Last edited by Black Hole; 03-07-2020 at 02:54 PM.
    Jay

  7. #17
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    Avon ZZS are fine for grip at freezing or below - I use them in track days in the UK at that temp. Just be smooth with throttle application and be more cautious of brake application as I find they lock up very very easily. Still plenty of grip for cornering.

    Why not reposition the wing. You don't need bolts for affixing wing to stay. Most common way is Sikaflex 292i and big heads. Refer photos in post #16.
    https://www.lotus7.club/forum/techta...e-wings?page=1

    No bolts needed. If you need to reposition then you cut it off, remove old adhesive and start again. Its how I do my CSR.
    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 SS Group A
    1985 Holden Commodore Group A
    1982 Ferrari 400i
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic
    and another project car coming....

  8. #18
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    Apr 2013
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    Quote Originally Posted by Croc View Post
    Avon ZZS are fine for grip at freezing or below

    Why not reposition the wing. You don't need bolts for affixing wing to stay. Most common way is Sikaflex 292i and big heads. Refer photos in post #16.
    https://www.lotus7.club/forum/techta...e-wings?page=1
    Good to know on the cold temps. The P Zero I had were abysmal in cold weather. Have not really tested my Micheline 4S at a cold temp.

    Thanks for the reminder on big heads. I had thought of the zip tie / bonding solution before and that may be the best solution. Amazon has the adhesive, is there a US supplier for the fasteners?
    Jay

  9. #19
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    NYC
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    Quote Originally Posted by Black Hole View Post
    Good to know on the cold temps.
    Still take care - there is not as much grip as on a dry warm day. I find braking is the biggest issue - you get wheel lock up quite easily. If you need proof my 3 way video comparison posted this week was on Avon ZZS. It was freezing temps plus moist conditions. Cornering grip surprisingly decent for the conditions.


    Yes googling "bigheads" could produce some unwanted results....

    The website is here
    https://www.bighead.co.uk/bighead-so...xtended-range/

    The one people use is 32mm square tyrap.

    As a distributor, they will probably only sell in silly bulk quantities so I would try Ebay to buy four for your purposes. Even if it is UK Ebay, the postage for four won't be too bad.

    Singles available here in UK
    https://www.ecfibreglasssupplies.co....tainless-steel
    They ship internationally if you call.


    Some additional information on using them and prep guidance
    https://www.lotus7.club/forum/chitchat/bigheads
    https://www.lotus7.club/forum/techtalk/bigheads-0
    Last edited by Croc; 03-08-2020 at 06:07 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 SS Group A
    1985 Holden Commodore Group A
    1982 Ferrari 400i
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic
    and another project car coming....

  10. #20
    Join Date
    Apr 2013
    Posts
    131

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    Quote Originally Posted by Croc View Post
    Yes googling "bigheads" could produce some unwanted results....
    Thankfully my web search only found the company and no collateral damage


    Quote Originally Posted by Croc View Post
    The one people use is 32mm square tyrap.
    Perfect, I was perusing the options and needed this info

    Off to eBay to see what I can find as there does not seem to be anyone retailing them in the US
    Jay

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