RPM Performance Centre private AIR drag day - Sat' 31st May
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Probably too late to reply to this, but worth a try. It's not calliper flex, the calliper as a whole is moving so it has to be calliper mounting bracket flex. Calliper mounting brackets are designed to stop the calliper rotating, they don't need to be designed heavy duty to stop the calliper moving in and out. Whatever it is is not the major cause of poor pedal feel, the outer pistons are moving towards the disc rotor the same amount as the inner pistons are moving away from the disc rotor. Hence no change in fluid usage, what extra fluid is needed to move the outer pistons is recovered from the inner pistons. For a calliper to move as a whole by far the most common reason is the rotor is not perfectly centred in the calliper. The first thing I check is that hub face is perfectly clean, bare metal, where the rotor hats contacts it. Then I check the that rotor is firmly held in place by at least 3 wheel nuts (or equivalent). If all of the above are confirmed to be in perfect alignment then I would check the piston sizes and ensure that the 3 inner pistons and 3 outer pistons have matching diameters (eg; 28/32/36mm). I have seen a no name 4 spot calliper that had 1 of the 4 pistons a different diameter. Maybe I missed it, are both the callipers exhibiting the same problem? I would remove the transfer pipe and inspect it to make sure that there are no restrictions. Maybe you already have but if not I would return them with the video and have them confirm all of the above. Hope that helps Cheers Gary -
If you have the original log book and it didn't have a chassis number quoted, then no money required. I have "rechassied" a number of race cars, no problem as long as you have the original log book. Cheers Gary
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By robbo_rb180 · Posted
Yeah was planned, cheers. -
Well the good news is that it won't run any worse with an atmo bov than it does with no bov, I've owned a few Nissans over the years (r32, s15 and now r33), the stalling issue caused by a bov or no bov while still having an afm is easy enough to live with, most people get used to driving them and just feathering the throttle when you come to a stop to avoid it stalling. Changing to a proper ecu with a map sensor is ideal but in the short term I'd just slap in the bov if you really want the whoosh sound. I looked into the pass through type maf like the R35 one above but decided against it as the amount of oil and crap flowing through the hot side would mean you'd have to clean it often to keep it working. -
Build an 800hp motor. Make it as bullet proof as you want, you WILL still break things. Like, the rest of the car. Heck, even as a dead stock car, things will still break, but the more power, the more everything else will let go easier. From gearbox gear sets, to extra stress on the chassis/mounts, more stress on diff, axles, tailshaft, even the suspension mounts. Check out the motorsport build that last year went to a Bosch motor sport ABS setup, and now can brake so damn hard it's twisting mounts for suspension/subframe etc. Now if the brakes can do it, imagine what happens with super grippy tyres and 800hp in a low gear... Shit, I'm presently out fixing the girlfriends daily driver that rarely sees past 3,000rpm and is used to cart the dogs around in. Everything WILL break. If you don't want it to break, don't drive it. And then laugh, as it will still break without even being driven!
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