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Hey all.

I've moved from 2 pot OEM sliding calipers to 6 POT Alcon Mono 6's with matching larger rotors. This upgrade has my front piston area gone from 2.99:1 to 4.4:1 in regards to the front and rear piston area.

The car is a ~1200Kg Turbo Mitsubishi FTO (front wheel & engined), and my local track is a low speed with lots of corners in quick succession and an average speed of @85kph and I am taking part in trackdays and trying to beat PB's and not racing.

My question is with this front biased brake setup and my rears locking up more easily as more weight is moving further forward under breaking what's the best approach to rectify?

I see some options but wanted to soundboard them here or get some additional insight from others with far more experience than I have.

* Increase the rear piston area to get the back closer to the OEM 2.2:1 Ratio - Seems pointless adding more braking force to the rears if OE calipers are already locking up.

* Stiffen front suspension? Shock/ Springs - Not sure to try combat the centre of gravity moving forward during braking.

* Try moving the center of gravity further back? I've no experience with geo setups but is it possible to slightly lower the rear of the car or find ways to add ballast to the rear to weight down the rear or move closer to a say 60/40 or 65/35 front-rear weight distribution? While still keep a positive rake? Maybe larger profile rear tyres or does that undo everything? in the geo?


Uh, just how much grip are you expecting to improve by?

You're using approx' 50% more front caliper area, and as the discs will normally be a larger diameter, that moves the effective radius out, which further increases the brake torque.

That change means you're looking at around a big reduction in rear brake balance, meaning it is a LOT LESS likely to have a rear lock-up problem.

It's not clear if you are actually having a problem with the new brakes, if you did with the OEM, or if you're over-thinking it.

If either of the last two, I'd try it and see, if it's confirmed there is an actual problem, I'd look at the pad compounds and CoF's, and/or use a pressure limiting device in the rear line(s) - an adjustable one could be used for fine tuning for, say track slicks on a dry track, to road tyres on a wet road.

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