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  1. #1
    S1Five Guest

    How to make the 15 handle like its on rails?

    Hello fellow 15 owners,

    as i can see from the members spec section i can see a lot of you have quite a bit of handling mods done to your car and i want to know has it significantly improved the handling/control of the car?

    These are the specific areas i really want to get to know:
    - which mod in terms of handling has most improved the rear end grip or was it a combination of a few items?
    - any of you have great track experience and could give me a few pointers in terms of suspension choice, spring rates, tyre choice inc tyre pressure


    reason being im so suddenly interested in handling package is, my older bro just bought a mazda rx8 with coilovers and boy does it handle superbly. the car just 'gives' alot of confidence asking you to accelerate out of the corner really early and the stability of it is just awesome and tonight i was just watching him take a u-turn along with my other friends integra dc5r with handling mods also and they both just accelerated out of the corner with no traction issue wot so ever. (note this was in full wet conditions + raining)

    my 15 atm in terms of handling is just better tyres, which im running bridgestone S03s all round with 235 front and 255 rear and they are new tyres so tonight i couldnt even try to push to keep up with them. My car on A boost runs about 140rwkw and i really want to sort out my traction/handling charecteristics before i think about using my B boost for tracking purpose.

    I hope i can turn this thread into a VERY useful thread for all the S15 owners out there who want their 15 to handle like its on rails. because i certainly do and hopefully we can turn this thread into a reference point for the 15 owners out there who want to start track work.

    ps: i hope i can personally add my own opinion to this thread in the future

    atm im most likely going to get Tein Flex coilovers in the near future and probably looking into getting some struts at the same time

    cheers for any feedback and i apologise for the long thread but im just so motivated to improve the handling of my car

    Tony

    (btw its 4am here and i didnt re-read my post to check for grammer/spelling!!)

  2. #2
    MazzyMan Guest
    My 2cents worth:

    - Coilovers a must
    - Anti Sway Bars
    - Front Custer Adjustable Arms
    - Rear Camber Adjusters
    - Rear Toe Control Rods
    - Replace Pineapples for rear sub frame
    - Proper alignment job

    With the above I am sure you will get into another dimension of handling!

  3. #3
    kieran Guest
    exactly what mazzyman said, they are all without a doubt the things to do, and the most important one at the end a good alignment

  4. #4
    S15R Guest
    Good set of tyres

  5. #5
    MazzyMan Guest

    Thumbs up

    Quote Originally Posted by S15R View Post
    Good set of tyres
    Now why did i forget about tyres?

  6. #6
    S1Five Guest
    Cheers mazzy you been a great help, hope more people can add to this thread with track experience of different suspension setups!

    i have one request could i get some simple explaination into wot each of these u mention in real life terms wot it actually does to the car behaviour around a corner or in a straight line


    - Anti Sway Bars (this minimises body roll and provide better turn in?)

    - Front Custer Adjustable Arms

    - Rear Camber Adjusters (i assume this one is just allowin camber to be adjusted for the rear to maximise rear end grip during cornering?

    - Rear Toe Control Rods

    - Replace Pineapples for rear sub frame

  7. #7
    kieran Guest
    you mention track experience alot, but what do you want the car to do, there is again a big difference between fast road set up and fast track? for instance if i wanted more grip on track, loads of neg camber gave me lots of grip, but was ****ty on the road

  8. #8
    S1Five Guest
    hmm i guess i want to have a more of a neutral balanced car and be able to accelerate out of corners early and to have stability and confidence to try and push

    i guess i can say i want more of a road balance for now and later tune for track work

  9. #9
    MazzyMan Guest
    Quote Originally Posted by S1Five View Post
    Cheers mazzy you been a great help, hope more people can add to this thread with track experience of different suspension setups!

    i have one request could i get some simple explaination into wot each of these u mention in real life terms wot it actually does to the car behaviour around a corner or in a straight line


    - Anti Sway Bars (this minimises body roll and provide better turn in?)

    - Front Custer Adjustable Arms

    - Rear Camber Adjusters (i assume this one is just allowin camber to be adjusted for the rear to maximise rear end grip during cornering?

    - Rear Toe Control Rods

    - Replace Pineapples for rear sub frame
    Dude...i am no pro ok...just sharing my experiences (dun kill me if i am wrong):

    - Anti Sway Bars = Yes reduces body roll significantly, however pls note that Cusco's rear sway is the same diameter as the original. Some say its the material thats different but for me i'd go for Nismo as the rear is about 1 to 2mm thicker which to me its kinda like makes more sense.

    - Front Castor Arms = It allows extending the front wheels further away from the rear thus meaning lengthening the wheel base. In most instance giving the S15 more wheel base length improves overall handling. As it is a case whereby shorter wheel base cars are more snappy at the rear or when it snaps its more unforgiving. For my experience i have extended the castor angle to about 7.25 (original is 6+) and it makes the steering flick back very fast during drifts...but again has a tendency to sometimes generate a very slight understeer. So with this experience it shows clearly that extending the castor angle slows down the rear from wanting to come forward.

    - Rear Camber Adjusters = You are right but lets be careful with this...more camber or less purely depends on a couple of factors. Your suspension's character along with the circuit you are in. Example, if you have "a lot" of camber, you would be enjoying good grip in high speed corners whilst suffering less grip on the slower speed corners especially when blasting out of the corner as the rear tyres dun have full contact to the surface. Again, this depends on your suspension, driving line and overall set-up.

    - Rear Toe Arm = Stock ones are relying on a big amount of normal rubber bushings which tend to allow more room to move during heavy activity. After market ones reduces the movement significantly thus keeping your toe angle the way it was supposed to be during alignment.

    - Pineapples = Very similar to above explanation. These pineapples are aluminum and they reduce sub frame movement during heavy activity...once again keeping the rear nice and tight.

    For alignment set up, its about having the rear toe to be set "in" and camber to your desire depending on the application. Front castor angle to be increased slightly from original, slight toe "out" and camber to application. This is more for circuit while for drifting I have my rear’s toe as neutral and very little camber and the front’s toe to be slightly toed out with heavy amounts of camber.

    The point here is to minimise any movement from the under carriage as possible, this way you will certainly feel like you are riding on rails. For starters, the coilovers you choose makes a big difference...in fact everything sort of works together or compliments each other so there is always a compromise if you are lack of something or if there is a weak link item amongst them.

    BTW...please someone correct me if i am wrong ok. I ain't no pro and just sharing my experiences.

    Still learning and experimenting like hell.
    Last edited by MazzyMan; 21-01-2007 at 17:27.

  10. #10
    Join Date
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    i think suspension tuning would be different for everyone as everyone's driving characteristics as well as road/track conditions are different, so while not being able to state exact numbers... some form of improvement would be to upgrade some of the standard bits and pieces like others have mentioned.
    a good set of tyres is vital for grip, camber on the front made some good improvements to cornering and a rear strut brace caused the car to have a more neutral steer... if you upgrade to a decent set of coilovers, i think the swaybars can be left standard... a too thick/stiff swaybar on the rear would be better suited for drifting...

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