09-07-2016, 01:13 AM
(08-07-2016, 05:30 PM)Poodle Wrote:(08-07-2016, 09:50 AM)BiG K Wrote: Yep fit straight on with no issues, vibrations or squeaks. I have a set myself and use the 306 Lucas brake hoses. The 307 calipers have a slightly smaller piston diameter than the GTI6 brakes, so keep the standard MC (my ph3 HDi doesn't have a 23.8mm). On a different note, the wheel weights scraped the caliper on XSi 15", so it is a tight fit. Definitely worth it, the old 266mm were ok but felt overwhelmed over 50mph. With these, 90+mph it just bites down.
Engine wise, possibly intercooler + oil cooler.
Tyres - Bridgestone Potenza RE002 at a minimum. Toyo R888's would be better but are pricier.
Strut braces really sharpen up the front end and to be honest, if you are going through the hassle, you might as well refresh the bushes on the front (I hear Citreon berlingo P bushes and polybush are a good match but haven't done it myself yet so can't comment how it is)
I might have a set of brand new in box H&R Monotube Cup coilovers if you are interested? (debating whether to get it installed on my hdi...hmm)
Not being funny, but if your 266mm brakes struggled over 50mph the issue won't be fixed by bigger discs and calipers. In reality it's typically down to cheap discs and pads, old fluid, weak hoses and/or partially seized calipers/sliders/pads.
Don't worry about mods, you'll be much better off making sure your basic maintenance is well up and together. You'd be amazed at the number of enthusiast-maintained vehicles i've seen with big brakes, expensive tyres, coilovers, etc, then gotten onto the inspection and found flat tyres, bushes that are shot to f*ck, balljoints hanging out, a brake pedal that doesn't work until the last 2" of travel, twisted brake hoses, loose bolts... Bit scary tbh, people are sketchy f*ckers sometimes lol.
No worries Poodle, 266 setup the discs, pads, hoses, fluid was all Brembo, replaced approx 1 year before the upgrade. The brakes didn't "struggle", the 266mm still braked effectively, the 283mm are just a lot better over 50mph and it would be, the larger the diameter of the disc, the more force that is available to brake the disc.
I'll be the first to admit, brake force increase isn't that much. Assuming clamping force is the same (same MC, same piston diameter in the 307 brakes, same leg), Coefficient of friction is the same (using Brembo oem on both and both pads were roughly equal in size), there is roughly a 6.7% increase in braking torque.
That's where it gets interesting though, more braking torque means you can apply brakes harder faster. This can mean that the reaction time to maximum braking torque is more rapid, this can mean shorter braking distances if the brakes are applied quickly enough and is usually more noticeable under those circumstances where the rate of brake application is at its most significant - i.e. from high speeds, as you cover more ground at higher speeds (1/20th of a second is 1m at 60mph)
The maximum braking force applied is not the force applied at the brake disc, it's the coefficient of friction between your tyre and the road. When Peugeot were choosing which brake setup to use 15-20 years ago, they would have made a compromise between coefficient of friction between tyres & the tarmac, cost, unsprung mass, sprung mass, use of vehicle (and some more, too late at night). I have noticed a definite change in tyre compounds, most likely due to the introduction of silica, which now can have higher grip with lower rolling resistance (https://www.youtube.com/watch?v=oV_6u4Z5p-c), meaning we can use the extra braking torque quite effectively, as grip increases.
The other way to increase braking torque is to use pads with a higher coefficient of friction, i.e greenstuff / DS2500 etc and it is more cost efficient. However the friction is dependant on the temperature, too high and the friction drops off.