Does anyone have any experience with this brand G4 Racing? I am keen on this front brake kit for my car http://www.justjap.com/parts/new/G4/...itcomplete.jpg . It is $2300 but I wonder about the quality and also if there is a possibility it will unsettle my handling having such big brakes on the front and the standard brakes at the rear while I save up for the rear kit? It comes with braided lines and 330mm discs and everything you need for the upgrade..

 

Interesting if there ever be a rear kit. since the handbrake cable integrate into it. So if they make it, it will be rx-8 specific and we are such a small market to do just that.

When you research the caliper, I think weight and material use to make the caliper is import. Also, the piston size (not just number of it).

More pad, not necessary = more braking. But it will share the heat generated evenly so it lasts longer in races.

Also research the pad material you can use with the caliper. The worst thing is to have the best caliper in the world which only take **** pads.

 

I spoke to them 18 months ago and my final decision was that the Racing brake kit was only slightly more and a well known and trusted brand.

Personally, unless you can see/feel the kit on a car or talk to someone independant I wouldnt be paying for it. There is someone who lurks around here that may speak up and attest 1st hand to a generic piston setup that just didnt work for the 8.

 

Looks very taiwan....

Actually my advise is, go for the tried and tested.... the grex, APs, P.MUs are all tested for the 8 to offer brake balance....

taiwan made calipers always say they OEM for this brand and that brand... but the fact is they one caliper and say its suitable for all cars...... when they dun offer brake balance.

 

They don't look taiwan, they look a bit more thai to me! :P

 

Ok thanks guys.Useful info,I think will stick to the AP racing kit I had my eye on. I just got drawn to the "8 pot" idea. You guys sure know your stuff,very helpful. Also,AUZOOM, I notive you have braided brake lines, what have you done to your car brake wise??

 

i was on greddy 6 pot before... and i tink its very good, with good quality and the pistons are bigger than endless mini 6s.

am now on p.mu 4pot racing caliper, not the forged ones.. and its good, except for the brake squeling sound...


If ur on a certain budget, get the P.MU forged calipers, 355mm brake rotors... most value for money.....

 

Id definately have to rate the project MU's

The problem with the GReddy's is that you have to use the GReddy brake pads (and theyre harder to source)

 

Lurking!

"In Internet culture, a lurker is a person who reads discussions on a message board, newsgroup, chatroom, file sharing or other interactive system, but rarely participates."

Is he looking at me? I resemble that remark!!!

Yes selection of brake calliper upgrades (like many things) is something you should carefully research before parting with cold hard cash (or credit for that matter). The experience of others is worth listening to. My experience was that of being a trailblazer but the engineer behind my willingness was too busy to concentrate on balancing the hydraulics/pistons for the RX8 (used same dimensions as a BF falcon) providing a very ineffective system (long pedal travel & less clamp force = no confidence!). Back to the drawing board for the engineer hopefully concentrating this time, but as no money handed over experience was not an expensive one just disappointing & embarrassing track times! They looked good though!!!

 

Balance that RXVIII talked about is that... even though the caliper phyiscally fitted ideally in position regards to the wheel and rotor.
The balance of the front brake and rear brake is not just the force that each caliper can produce on its own. There are many other factors.

You see, for a piston to move you need to push the brake fluid from the master cylinder (hence from your middle pedal), creating enough fluid force for the piston to transfer the same force to the pad, and hence create friction to the rotor....

May be in RXVIII's creative caliper, a larger amount of the fluid required or a greater force that the fluid produces from the master cylinder is required. So his option to fully use those calipers is of follows:

Upgrade the master cylinder to produce a greater force AND
change the brake tubing of the front caliper so that the amount of force generated from the upgrade master cylinder can transfer in a balance to both front and rear, hence that is brake balance...

Why do I have AP Racing caliper, you ask? Because I followed one with it (Ric's car) and sat in one with it (Rotormaster's). I have no other caliper in mind. A few Japan RX-8 tuners uses the same, RE Amemiya uses it.

AP CP6600 or CP5200 (they are different size physically but the mechanics are identical). CP6600 is more compact but CP5200 looks better. Now CP6600 and CP5200 has pads from most Japanese pad company, so that is not an issue too!

 

I've noticed heavy wear on my front disc's and poor stopping power lately. Is there a big difference between one of these kits and the std set-up with race/better pads?

 

I had an experience to test once... is very hard in a way because so many variables. I will explain.

Even I tried RXVIII stock system early this year with the same pad and rotor as me at Boardford. I can feel the difference, and YES if stock system with Project Mu pad score a 8, with AP I will score it 9.5.

But to his defense, He has a faster FI car. I had a suspension upgrade that allow better shifting of weight, and I had a better slick that stop better than anything in the market at the time.

The bulk of the difference is on the pad choice.
But is the difference between stock caliper and upgrade caliper is significant? Yes!
Is it big? Well .... it is very subjective. I will say yes, but others may be not.

 

RE-Amemiya demo RX8 is using project Mu 4 pot calipers... However they are selling the AP 4 pot calipers for the rx8...

Knight Sports demo RX8 is now testing the stoptech 4 pot for the rx8... it was said that this stoptech that the are tsting is a new prototype and is not the same that was produced earlier... stay tuned.

AP calipers were in my consideration list as well when i was looking for brakes upgrade... however i was more swayed over by japan products which is y i chose p.mu (looks play a factor too p.mu calipers are bigger and has 355mm rotors) ... But i have got absolutely no doubts abt AP racing quality and its braking abilities.... which was my second choice!!

 

my first change of brakes was changing to autoexe brake rotors, with steel braided lines from autoexe and autoexe street brake pads. Braking was definitely better than stock... in fact a huge improvement..... For normal street driving, i tink this wld suffice.

Second change was to greddy 6 pot, which i feel is one of the better value for money 6 potters ard. Brake pads can be up to 800 deg which is suitble for track use. Brake lines are from earl's, which is oso renowned. Looks oso plays a part fo me, becos the gold calipers suit my bronze CE28s.

Third change, which is my current, is to Project Mu, racing calipers, special customed gold colour. Reason changing is more for looks, as i prefer 355mm rotors and changing to a bigger piston 4 potters to test. A bit regret as i cun swap to 17inchers rims for track purposes.... however braking has been superb..

 

I have OEM rotors, Goodwin SS brake line, Endless SSR pads up front and Project Mu HC+ pads in the rear. I really really like the balance of this pad setup. The SSR modulate really nice but if you stomp the pedal they bite really well.

I think there is a guilty conscience around here to :p

Cheers

Andrew

 

Okay, I'll ask the dumb question:

Can someone explain in simple terms why changing the brake lines improves braking performance?

 

Less expansion under fluid pressure.....

 

The OEM hoses are just rubber.

Under heavy use, frake fluid runs in and out causing friction causing heat causing expansion

and we all know that hot brakes = longer stopping time

by swapping out the hoses for better ones, youll be able to get better response from the brakes. ie less brake fade, better bite and better lap times

 

like drew said, oem hose are made of rubber. during hard breaking, the brake fluid heats up, and because of this heat, the rubber hosing may expand when the brake is pressed. if the hose expands, you need to press harder on the pedals to generate the same amount of pressure. With stainless steel braided hose, the likelihood of the hose to expand under heat is much reduced, therefore you maintain the pedal pressure/travel length.

there is also a possibilities with rubber hose (oem) once expanded, may collapse and thus blocking the brake fluid from reaching your brake callipers, i.e., no brakes! Although this is just what I heard, haven't actually heard happened to anyone I know.

 

Thanks for those clear explanations guys.

Every day's a school day for the mechanically challenged, lol...

 

Oh the perils of access to a computer and a credit card on a rainy day, lol.

I've just ordered a set of M/S brake lines from JapanParts.com.

Does anyone know if Graham offers a discount for members of this joint? We've spruiked for him often enough, you'd reckon we'd get a bonus somewhere, lol...

 

Actually, I just remembered applying some discount points when ordering. Is this simply because I'm a past customer with points accrued or is it because rx8club.com members do get a deal??

(Sorry for dragging your thread off topic Matt).

 

i think you have to contact him via PM and hell sort it out!

new brake lines, new end links, what else are you getting dave?

?????????????????????????????????????????????????? ???????

?????????????????????????????????????????????????? ???????

 

Hahaha, I wish.

No no, my little bits and pieces ordered today will do me for a while I think.

 

There is a discount code for RX-8 club.com members for his japanparts.com website.