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Cheers mate. Lots of work gone into the car to bring it to that level, and i'm sure there's some car improvment, and certinaly some driver improvment to be found yet..Quote:
Originally Posted by wynode
Just finished a great day at Oran Park south circuit, posted a 0:53.2540, so i was pretty happy with that time.
:)
Intersting to see the times of different makes of cars, I'd love to get my mx5 out there to see what it can do ( I'm from Melb)..... maybe a 1.10:D
If your MX5 is race preppred with slicks, certinly possible.Quote:
Originally Posted by mossy
are stock suspension realli limiting on track?
ive been to wakefield 3 times now
and while my best lap of the day is improving
it is getting faster only by tenths of a second
im realli frustrated becasue i know my car is faster than this
after re-reading alot of people's posts on b16a cars with suspension mods
they are getting like 1:17's
i feel so slow!
do suspension realli shave off a few seconds when used to full potential
my fastest is 1'20.8 now
full stock EK4 with 195/55r15 GIII's
yes gelo...
G'day everyone,
For what it's worth, Wakefield is our local test track and we're generally there once a month or so doing testing.
We had an EK Civic Vtir Coupe project vehicle on the fleet that we used to develop the Civic product. The best time we got in the dry was 1:15.9 but could circulate comfortably in high 16's.
Driver - Wojtek R. Whiteline R & D manager
Engine - Standard
Brakes - Hawk pads
Tyres - Yokohama ES100 205/50/15
Suspension:
Whiteline "Group 4" coil-over kit. (Spring rates 6kg/4kg mm fr/rr)
Whiteline "Handling Pack" including front and rear adjustable swaybars, front caster and camber kit, rear camber kit.
Whiteline Chassis Bracing package including front and rear strut braces, B pillar brace, rear lower arm/swaybar mount brace.
We generally keep engine and other components standard as we're out to test chassis mods only doing lots of comparison work with data logging. Brake pads are often upgraded simply to give us more capacity for laps on the day.
Our R & D guys, who are not race drivers but enthusiasts still maintain that it was one of the sweetest cars they ever drove on test. From a chassis side it felt wonderfull inspiring a lot of confidence.
If nothing else, this time should give you some sort of benchmark of the potential of "chassis-only" mods for a street car.
Hope that helps
Cheers
Jim
Whiteline
from what ive gotten out of Wojtek - the EK4 he drove previous , was totally stock engine wise - as he puts it " JUST chassis mods".
Very interesting :)
Jim, just to add to the benchmark:
my DC2 VTiR managed a 1:14.9 (transponder timed) with 'just chassis mods' and a set of 4-1 headers on R tyres... did some 1:15's and several 1:16's quite comfortably
well - the mods were Cusco coilovers (12k/8k), whiteline 24mm rear swaybar, ITR brakes, no strutbraces, no alignment mods, no chassis braces, no air intake mods (stock filter), 2.5 year old Proxis RA1 tyres...
your EK would be quicker with harder springs i reckon ;)
Hi everyone,
Spring rates of 6kg/4kg used were as per "Circuit/Road" spec Group 4's to suit road tyres. If we were running R spec tyres we would reccomend and fit "Race" spec spring valve combination at around 7.5kg/5.5kg. High performance road and or R spec semi-slicks can not generate enough grip to warrant spring rates in excess of 8kg, particular when used on a relatively poor surface track like Wakefield.
For what it's worth, most cars we test and develop with at Wakefield will see a 1.5 to 2 second per lap improvement when using R spec tyres vs performance street tyres and another 2 seconds for slicks. For example, our P-Rex XRD (Tarmac rally setup '97 STi with pro driver) holds the club record on slicks at 1:05.80 using Michelins, our P-Rex I (99 WRX with gifted amateur) had a class win at 1:08.27 using Dunlop D-01's. Best case for similar car with performance street tyres using a good setup is late 1:09's or low 10's.
As a rule of thumb, expect a 2 second reduction per tyre class change. So I would suggest a DC2 VtiR on R spec with a good driver should be able to get into high 13's to low 14's if properley setup, particularly with some extra power and better brakes.
Apart from all the above, we did not post lap times as an absolute or as a challenge to others. We do not use race drivers for testing road setups and nor do we compare results from different days when weather and track conditions can dramatically vary the results. Our testing is about acheiving predictable handling with consistency while logging maximum sustainable G's and handling bias. Its also done primarily for road/weekend race hybrid product which is our main market. We can and do prepare some tarmac rally cars but these are not driven on the road and can be designed more toward a race biased compromise.
Best
Jim
Whiteline
whoah, for sure Jim, no challenge or absolute perceived!!!
we're just setting some benchmarks...
do you think my VTiR would benefit from fr/rr strut braces and increased camber?
my tyre wear was very even http://forums.clubrsx.com/attachment...hmentid=154709
(this was my best tyre)
my current alignment settings are 0,0 toe allround with factory camber of about 1.8 degress
Tinkerbell,
You'll certainly benefit from more chassis bracing, you can read why in general here. http://www.whiteline.com.au/faqelse01.htm#Chassis and strut bracing . The heavier the spring and swaybar rates the more benefit to be found in a stiffer chassis.
However, and with all jokes aside, I would bet you a set of springs that you will go faster at with much softer springs than you have now. Camber settings are probably OK as you can generate enough grip with those springs to compress the wheel adequately need more more neg camber. Also, try some toe out on the rear, say up to 1.5mm total toe out.
Cheers
Jim
Whiteline