Jump to content


Photo

race pace cornering


  • Please log in to reply
68 replies to this topic

#61 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,601 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 02 February 2009 - 11:03 AM

My preference are Ferodo DS2500's or if you’re really giving your brakes a hard time; DS3000's.



#62 chev z

chev z

    Advanced Member

  • Members
  • PipPipPip
  • 222 posts
  • Location:benalla , vic

Posted 02 February 2009 - 08:47 PM

My apologies to everyone for going of the initial thread.

Bloody hell Lurch, your the moderator keep me in line, hang on a minute ....after back tracking thru the posts, I realised your mainly to blame for my errant meanderings.

Xa73 has brought up another discussion point, that being the use of neg. camber on the rear wheels.On Friday I will set up front caster between 3 to 4 degrees positive.[ depends on available guard space ]
Also increase the front camber to 3.5 degrees negative. 

The proposal of Xa73 to go with 2.5 dgrees of negative camber on the rear has merits ,in that it will increase the amount of tyre contact with the track when cornering, but will this setup  negate the turn in that we have successfully achieved and actually reverse our progress in counteracting the devil UNDERSTEER.

Ideas welcome especially before Friday

#63 Zeddophile

Zeddophile

    Senior Member

  • Members
  • PipPipPipPipPip
  • 987 posts
  • Location:Melbourne

Posted 02 February 2009 - 08:54 PM

The proposal of Xa73 to go with 2.5 dgrees of negative camber on the rear has merits ,in that it will increase the amount of tyre contact with the track when cornering, but will this setup  negate the turn in that we have successfully achieved and actually reverse our progress in counteracting the devil UNDERSTEER.


For that you need to look at your rear tyre wear patterns, and work it out from there.  The thing to remember with XA73s suggestion is that it is part of a full package setup in a particular way, and the ingredients in your suspension setup are quite different.  I'd almost be tempted to develop the front end more first until you notice less rear grip than front.....

As far as brake pads go, I like QFM A1RM.  Run them all round in my GTV6, no issue at Sandown, and they are cheap.  Not quite as cheap as the Lucas pads I believe, but not far off.

#64 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,601 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 02 February 2009 - 08:58 PM

No worries Steve - always pleased to confuse! :P

It may cause you to loose some turn-in, but as I haven't tried this myself I can't say for certain.
Give it a go mate & report back!


#65 chev z

chev z

    Advanced Member

  • Members
  • PipPipPip
  • 222 posts
  • Location:benalla , vic

Posted 10 February 2009 - 06:38 PM

I must admit I am feeling guilty while writing  about liesure activities when so many are enduring so much pain and trauma with the fires.

GIVE GENEROUSLY  'Z'  enthusiasts

A fair assessment of the front suspension changes weren't accurately available due to the change of rear tyres.I should have left the  225 x 60 x 15  on the rear  , they are definately the best way to go.They allow amuch better transfer of power to the tar and keep the rear end in a tidy line.
Although my fellow competitors said it was great watching the rear end action of my car.It was a full time job to keep it on the black stuff.

What was that Neil Simon song  about nearing your destination and
..." slip sliding away"

The set up for the Z was  2.5 degrees pos. castor and  3.5 degrees neg. camber.
I ddn't have time to change rear camber ,but will look into it in the future.

I suppose there was only one real positve that I could take away from the day, I decided to alter the konis one full turn on the front [ harder ]before my final run , this did enable me to beat my best run on the short  Winton track by approx.    1/3 a sec.
Yes I realise that it is not that significant a drop, but looking on the positive side the car and driver were definately not  "AS ONE "

YOURS STEVE

#66 Zeddophile

Zeddophile

    Senior Member

  • Members
  • PipPipPipPipPip
  • 987 posts
  • Location:Melbourne

Posted 11 February 2009 - 06:40 PM

I decided to alter the konis one full turn on the front [ harder ]before my final run , this did enable me to beat my best run on the short  Winton track by approx.    1/3 a sec.


1/3 of a second probably covers nearly the top ten places in V8 supercar qualifying, so its not exactly an insignificant gain!  And any gain is of value.

#67 chev z

chev z

    Advanced Member

  • Members
  • PipPipPip
  • 222 posts
  • Location:benalla , vic

Posted 11 March 2009 - 08:09 PM

I hope I'm not boring you with my meanderings.

It is time to try my first real event.
Winton motor raceway has the  sprint series starting this weekend...round 1

I have decided to do the Lurch tutorial front brake upgrade  and only a few other minor alterations to the setup .
The only concern I have is that I can't upgrade the m/c to a 15/16 or 1 inch
Thanks Lurch for tracking one down for me, a pity it won't be hear before raceday.

He assures me all I need to do is PUMP the brakes alot before each corner[ lol ].I reckon I might go steady for a trial period ...say one lap

Definately replace the "slip sliding" rear rubber, back to the 225 / 60 / 15 ,  the front will also be changed from the 205/50/15  to  205/60/15

I won't lighten , change front end castor /camber or the konis  as yet , so as  I can compare the cornering to last time.
I think we have completed the major alterations,  now it is time to fine tune these improvements.

Another variable that I really haven't tinkered with is tyre pressures.Perhaps we should keep these as a constant .

Any further ideas readily considered.

Been to a funeral today  ,  " LIFES SHORT  so everyone  HAVE A GREAT ONE "

#68 Zeddophile

Zeddophile

    Senior Member

  • Members
  • PipPipPipPipPip
  • 987 posts
  • Location:Melbourne

Posted 12 March 2009 - 06:13 PM

He assures me all I need to do is PUMP the brakes alot before each corner[ lol ]


You see that quite a bit at sprint days - have an amusing image in my mind of watching a mates brake lights flickering from about halfway down the main straight of Sandown, only to lock the front wheel into turn 1 and end up rallying through the grass while I casually sailed by on the black stuff giving him a toot and a wave  ;D.  The time you have available to sit and observe while driving a standard 4 cylinder on a racetrack...

Lurch is of course correct though, you'll probably find the first and maybe also second pump feels spongy, but after that it should be a good firm pedal (until you take your foot off, then you have the old rinse and repeat!)

Apart from that, I think you are taking the sensible approach to this meeting - iron out the little kinks, and see how it really runs, then you'll get an idea of where (if at all) to make more big changes.  Good luck, and have fun!

#69 chev z

chev z

    Advanced Member

  • Members
  • PipPipPip
  • 222 posts
  • Location:benalla , vic

Posted 22 March 2009 - 08:33 PM

Well we were back onto the  Winton long  track, as I mentioned ,and dropped my PB to 1min. 46.44sec. which is close to 1sec. better.

Considering the brake upgrade was placed on hold , I had a small problem with brake line connections not matching, I think the better tyres and perhaps being  a cooler day helped achieve this time.

It was a pleasure to get reaquainted with the Devenish family and also see how a Z can be driven, 1min 38's,Pretty impressive steering Rob. I love the passion that the whole family has for the Dattos and the time they have for newbies like myself.

One thing I learnt on the day ,was by setting the front konis softer by 1/2 a turn leads to slower times , 1.5sec. to 3sec. a lap.And a couple of dirt driving experiences.
My fastest time of the day was after firming the front 1/2 a turn [ from the original setting] Next time out I will soften the rear by half a turn[ the rear is set on fully firm]

Then will begin the lessons on adjusting the bottom settings for the konis, Hell I don't even know what that's called let alone what it does to the suspension .

I have another dilema to ponder over the crop sowing period, and that is whether to transplant the V8 Lexus into the 260z or be more patient and buildup the 240z with v8 etc.......mmmmmmmmm?




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users