Sat Sprints At Qr - In circuit we trust  

jezza323

agree 100%

evo201

well my 2 cents worth i use ebc reds, rda slotted rotors, pbr 600bf fluid and stainless braided brake lines in the evo and it hasnt had any dramas with stopping but it is considerably lighter then the later models

neil_se

I'm using RDA slotted front discs ($160 pair), Lucas 0-600 pads ($130 set 4), with 2nd hand Dunlop semi-slicks and i was easily outbraking every car i passed on Sat. Fluid was a bit old though. I ran the same setup with cheap tyres 4 months ago and the difference was night and day.

I reckon the extra money to a fancy set of discs/pads could be better spent on more practice days and better tyres, resulting in even quicker times.

evo201

thats because you passed me under brakes when i went deep to avoid the porsche who had spun
but where is your car in this pic???? behind the evo

neil_se

After i'd waited 4 laps to get past you

jezza323

ill give u a brake test any day mate hehehe

definately agree though, ive just got RDA slotted rotors on front, DS2500 pads, Motul RBF600 fluid, std rubber lines and standard rear rotors & pads

good fluid makes all the difference

GTRVspec95

Thats why I posted the question in here to get different opinions on a set up which most of you guys run and use and can give first hand feedback on the gear

If anyone has any other comparative questions on modifications they'd like to ask of the rest of the group feel free to post it here

It gives us all something to talk about during the breaks in Sprint days

neil_se

It depends what you're budget is. If you're driving a $50,000 car then fair enough go all out, but if you're building a budget racer like me then the extra $500 could be better spent in other ways to make my car faster.

Rookie ROX

Try having a read through this Jamie - http://forums.mrtperformance.com.au/showthread.php?t=1 (and http://forums.mrtperformance.com.au/showthread.php?t=4446)

I found it very informative

Edit: Link fixed

ROCK ON
R~R

9krpms

Just going off topic a little, how is my race line?

superdave

I'm no expert, but to me looks similar to my line. I like to late apex turns 5 and 6 though, but I'm FF and need to offset the understeer.

I have been looking at getting the PerformanceBox, who did you go through and what are your thoughts on it? Did you shop around to see what else is on the market? I ask because I would rather a higher resolution than 1/10s. I was after at least 1/100s if it doesn't blow the budget. But the DriftBox/PerformanceBox has the racing line/speeds feature, which is good.

jezza323

hard to tell because its not a true indication of the track width

GTRVspec95

Nah it's all good

Provided it has anything to do with Sprint racing I gladly welcome it to the thread

Only thing I'd comment on is the deviation on the main straight coming in and then coming back out for turn one

MEV09

tisk tisk tisk, someone doesn't know track very well.

adding 50 or even 100 kw to your car will do jack shit to you lap times in comparison to better brakes. the later you can brake the longer you can hold your foot to the floor, bad brakes = increase brake area.

take me for example, i have a semi decent brake and suspension set up. there are cars will tonnes more power than mine, hsv's and fords, and they are a lot slower than i am around the track.

you will only get the advantage of more power if you can pull that power up.



near all track is perfect, although you will find that you will hold more speed in turn 2 if you enter from middle of the track as the corner is negative cambered at the entrance out wide and on the straight hug the left of the straight instead of pulling into the middle.

also if you put your braking points on the graph you could get some advice on that as well

9krpms what do you drive?

neil_se

I didn't say i was going to spend the extra money on power mods I spent it on semi-slick tyres and an aftermarket radiator to stop the car overheating and improve reliability.

I'm well aware that extra power has little relevance to quicker times, with my current setup i was running quicker times than others in S13s with 100rwkw more than me.

jezza323

semi slicks are a much better investment than 2 piece brake rotors IMO

its all about levels, once you have reached a certain level.....good suspension setup, decent stock brake setup (pads/fluid maybe lines), decent amount of power.....and u still wanna go faster, then you do the next level, which may be hardcore brakes, better suspension options, slicks etc....

ive got suspension and brakes sorted...next is power....but then i will go for a better suspension setup because what i have now works at the level i am at (pedders springs, decent shocks, anti-roll bars) because i dont have enough power (therefore speed) to push the suspension really hard. once i do, i will move onto a decent coilover setup, then i will want better brakes.

you can go quite a long way with stock brakes, with decent pads and fluid. you will just go through rotors or pads more often than with maybe a bigger setup (due to extra heat)

GTRVspec95

But then again the radiator would keep your engine temps cooler thus being able to produce more powah !

Just kidding ...

But in all seriousness I'd tend to agree with neil ...

As a budget racer we don't know what power is

So the need for a high end brake setup would be over kill on our cars, where money is better spent balancing out all the rest of the car for track work

neil_se

Yes, i don't think the 120 degree temps last time were doing any favours for my car's power levels.

Mezevenf

I take turn 6 differently, I tend to stick left then cut one apex instead of following the inside all the way around... but our lap times are similar so *shrug*. I want a data logger!

As for brakes braided lines are a pretty cheap investment that will really improve your pedal feel (and can also help with some heat issues).

jezza323

yeah i turn into both S's late, and take the final turn as Mezevenf explained, but its hard to tell how that line actually relates to the track, because those track outlines on the logger screen are not the actual edges of the track, they are interpolated from the lines (as you can see)

the left hand edge is just the further most left position of the car + a lil bit, and the right edge is the further most right position of the car + a lil bit

as i said in my previous post, its not an accurate representation of the track

try getting the data into google earth (with a correction to get it onto the actual lines you take on the track) and it will be much more meaningful

Minko

What power do you have? your silvia seems to run reasonable times.


I need to get back out there but cant decide on what car to buy

neil_se

180rwkw, still a lot more than other cars running a lot quicker than me

jezza323

assuming you are the person i think you are in the results, improving 3.5 secs in 1 SAS aint half bad, even with semi slicks taken into account i would be very happy with that

if you have not driven on semis before you will find it takes a while to get used to driving them on their limit. you think you are on the limit.......but when u go "fuck it" and try a bit more.....it still sticks!

neil_se

Yeah, i could have been pushing a lot harder through most corners, i'm still getting used to the car and trying different lines.

Minko

Yeah i hate those buggers with all skill no power

Think ill be "downgrading" next to take you guys on, 200KW~ in a smaller car & just concentrate on increasing driving skill, less consumables....more racing! gotta be better than 300+KW tank & still have those evo's walk over me

neil_se

Do it man! You'll enjoy the lower costs, better reliability and less lag. Lighter cars= less pad, rotor and tyre usage. I'll have to start taking weight out of my silvia soon.

9krpms

For the cost it's a fairly good unit. It would be nice if it could record brake and rpm input. I think this is available on the Vbox/Performance box. Overall it's an easy to use unit with the basic essentials to analyse and log the track. I think it's simple and good enough for me.

I think Racer Industry is the only distributor in QLD/Australia (last time I looked at it). If you like to get one asked for Jason at RI and say Dan referred you. He should be able to do some deal for you.



It's as close as I can without getting on a scooter around the track. During the practice session I took 2 cool down laps and just ran along the outside perimeters of the track. The driftbox was placed in the middle of the s2k so you can add another 1/2 of the s2k either side to get the real track width. I did not cover the outside section of turn 3 very well but if you go outside my outside line you are definitely not on ur race line. RI produced accurate circuit overlays for the National and Clubman tracks but not the sprint. So this is the first one. If anyone like to get a copy of this just drop me your email



I think I was overtaking some one at the last turn and along the straight with this lap


thanks for the tip
The driftbox doesn't have brake input but my guess is that I used it too early as I am not used to the car yet. I often drive a 32GTR at QR but this was with my S2000



I think I do the same but I think I kept the inside line as I was trying to set up to overtake another car.

jezza323

i dunno, i chewed threw my first set of semis in 8 sprints, with less than 50kw atw and 830kg's

WRX2EVO

I've always used DBA 4000s slotted on the front for the track and found them to perform very well. You really need to run them on the street with used pads for several weeks at least if you want good long term use. I've tried the quick bed procedure and ended up with cracks, especially on the national circuit. Also important to do some good warm up and cool down, rapid temperature changes = fatigue and crazing and cracking.

I've used DS2500's front and rear and RB74's front. DS2500's on the front for my car are now up to $300+ a set which is too much for me. RB74's perform well on street and track and cost <$180 for the front set.

DBA 4000SL rotors for my rex cost about $210 each and I run them street and track.

Give Trevor Sullivan of Brake Distributors a call http://www.brakedistributors.com.au/default.htm

SIN61

looks like my parts should be here in about 4 weeks, so i might just get out there in time . buying some new wheels this weekend and going to get some good rubber for them.


oh an jamie, congrats on selling the barge, whats next? (pm me if you must). i want some of that spooning action at the next sprint day

GTRVspec95

Geez ... news travels fast

Yes the Land barge is sold and is with it's new owner

So I can knuckle down and concentrate on spooning SIN61 harder then ever ...

errr ...

I mean ...

Building the Track/daily

Given the prices coming in for the DBA's I'm almost tempted to go for a set of ENDLESS or Spoon rotors

neil_se

I think you'll find that a large car wouldn't get through as many with the same compound.

SIN61

anyone know off a good place that sells alloy radiators? for fcs?

ONE600

Jamie get ivan to get you second hand spoon brakes, they are worth the money hey and not as exi as you would think (1000-1200k). Do a mod properly once and you never have to touch it again.

9krpms: I dont know how accurate that is. T2 you dont have to turn in so late, t5 you dont have to hug the exit so much. Im normally in the middle of the road before turning into t6. And you seem to turn in too early at the last corner t7.

My 2 cents but as I say I dont know how accurate the drive line shown on that map is

MEV09

my evo uses a set of RE55s in about 3-4 track days, full days though not half. Nice times in the s2k, i was out there i saw you guys racing but i was in the saloon car for the first time so i was a little off the pace.