2008 Polo GTI 9N3 brakes and brake master Cylinder upgrade - ESP question

[sambb]

if you're not after the max that the car can give and just wanted a flash tune then you have all sorts of option, none of which bind you to any location.

[pologtiforfun]

Yeah i am aware of the various flash tunes out there, and the seem to be good bang for buck so to speak.

Guess i like to take the road less traveled, ask advice and then look at the best options for what i am trying to achieve.....thanks again for the helpful advice always appreciated. i'll those contacts a buzz and see which one suits me best.

I know its probably a silly question does this forum have catchups or drive days etc ?

[sambb]

um in sydney not so much. You just missed the VW Nationals last week which had a show n shine and a track day at eastern ck. I'm on the northern beaches. A mate and I track our cars a fair bit. Best way to get into it I think is hillclimbs. Its cheap to enter, teaches you a lot and because the runs are short, wear and tear is minimal. If you can join a cams affiliated club and then get a cams L2S license (don't be intimidated its just an online form/payment) you can come and do hillclimbs/ tarmac rally sprints/track days with us. After eastern ck, closest to you would probably be straight up the freeway to the Ringwood hillclimb complex at Raymond terrace.

[pologtiforfun]

fair enough.....its usually the way murphys law etc...there is always next year for the VW show at the creek.

i'll know about the ringwood hillclimb complex good to see how the polo handles the hillls, good advice.

Just had the o2 sensor go, i checked the system with scan tool that i have, so guess its a good a time as any to look at the 2.5inch downpipe upgrade....slowly getting through the list of mods to be done.

wheres the best place to by these fleabay ? aka ebay its the front one

[seangti]

The TT calipers on 312 rotors don't require work being down on the master cyclinder. It retains a very factory feel and pedal travel, even at track speeds, pulling up nicely from 160-180kph to 80kph.

You can also run vented rear discs and calipers from the Bora 4 motion. They are much the same size as stock, I think a whisker larger, but are vented rotors rather than solid.

I run Brembo 4 pots on the front of mine with QFM A1RM pads and Bora 4 motion on the rear with Remsa pads. It stops exceptionally well lap after lap, but must admit the pedal travel isn't as far as stock or TT which makes heel and toe near impossible, or the occasional over zealous braking and end up biting the steering wheel

[pologtiforfun]

Thanks Sean,

Always good to hear from someone who is actually using the standard BMC on the upgraded brakes, and using them on track days.
Do you find the brake pedal has a bit of a long feel to it ?

My thinking is while i'm doing the brake upgrade may as well do some trial and error on the BMC.....worse case i get to have the adventures of bleeding the brakes etc all over again....if its very similar to the factory feel of the original brakes then i will definitely notice the difference when i try the new BMC. One of those if / when i do it i will know

[seangti]

There's quite a few people on this forum running TT brakes and a few others on Brembo and Porsche gear. I've not heard of anyone having upgraded the master cylinder.

On mine - the brake pedal is firm and high, extremely reassuring and confidence inspiring to keep pushing the braking markers.

On the TT set-up I drove on track (which was Gavin's car, I think forum name if H100vw), the travel was comparable to factory arrangement. The TT set-up had a similar out right braking ability to my brembo, but required more travel to get full bite. Not something I'd say is a bad thing and certainly not what I'd consider a long pedal.

I just vaguely remember some of the hydraulic studies I did years ago and start breaking out in a cold sweat thinking about the calcs requried to see what effect changing the master cylinder would cause.

The factory calipers matched with good pads, ducting and braided brake lines can perform exceptionally well. For the large majority of applications, it's typically adequate.

[pologtiforfun]

mmmm yeah sounds like the standard BMC is fine, maybe i am just over thinking the issue.

And thanks honestly for the advice i really do appreciate it.

The other thing is i do have the required parts so its not like its anything more than trial and error by me.

I did find that extra bit of pedal required to get the brakes to bite a touch unsettling when i first drove the polo, maybe i'll get use it.

I do have braided brake lines to go on as well....hence the while i'm there may as well do the trial and error method even if it is just a quick run around the block. I cant say i know all the details involved in calculating the effects of different BMC etc.

But if its just another hour or so to swap over to the new BMC try it.....i can always go back to the old one and after all its just a bit of brake fluid and time

[h100vw]

mmmm yeah sounds like the standard BMC is fine, maybe i am just over thinking the issue.

And thanks honestly for the advice i really do appreciate it.

The other thing is i do have the required parts so its not like its anything more than trial and error by me.

I did find that extra bit of pedal required to get the brakes to bite a touch unsettling when i first drove the polo, maybe i'll get use it.

I do have braided brake lines to go on as well....hence the while i'm there may as well do the trial and error method even if it is just a quick run around the block. I cant say i know all the details involved in calculating the effects of different BMC etc.

But if its just another hour or so to swap over to the new BMC try it.....i can always go back to the old one and after all its just a bit of brake fluid and time

Swapping a master cylinder is a massive job, dont start without mentally preparing hard.

ESP on the mk4 chassis also has a yaw sensor. More sophisticted than the Polo set up. It has rear drive to control as well.

Sorry I didnt get to call you tonight Clay I was at work until after 7.

[sambb]

does the whole booster have to come off from inside the cabin before you can get at the master cylinder or is the master cylinder bolted to the booster from the outside?