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Hey guys. Just doing my usual improvements where it counts for spirited driving.
* installing the Girodisc 2pc rotors and Hawk pads
* bleeding the brake fluid and replacing with higher performance fluid
* lowering car
* getting more aggressive alignment
* adding radiator screens….a bit late at 8000 miles.
Fun facts: rear rotors are larger diameter than front rotors. The **edit** OEM internal cooling veins are the same direction on both front rotors. Probably for production costs, but this means passenger side internal cooling vein is backwards. The bolt (bracket) behind brake pads is a ridiculous bolt that requires a thread/tool most don’t have. Replaced with a metric bolt for easier pad replacement that won’t require removing caliper. The lowering collars for front is a laborous process. $$$$’s. Girodisc 2pc OEM before upgrade Gravity bleed after sucking out top reservoir. Disconnected battery to prevent brake cycling. Dirty SOUL tips.
IIRC, the rear rotors are 5 mm larger, yet they're also much thinner. I don't get the logic of larger diameter since it still has less heat capacity afterall with less thickness. I suppose it has better cooling that way?...
IIRC, the rear rotors are 5 mm larger, yet they're also much thinner. I don't get the logic of larger diameter since it still has less heat capacity afterall with less thickness. I suppose it has better cooling that way?...
Probably so. I did ask my tuner about the rear emergency calipers and how heavy they were. He said they were light, all aluminum. I remember from your post, they were heavy. LOL! Funny how reach persons assessment is different.
Post alignment specs/settings after lowering and wider tires
Probably conservative post alignment specs. I have wider tires all around. Lowered car. The rake appears to be slightly higher in back by 2/8ths of inch. Anyone know the OEM rake?
I will put some miles on this conservative set up and see what it feels like. At least car is corner balanced with my weight.
“The Girodisc internal cooling veins are the same direction on both front rotors. Probably for production costs, but this means passenger side internal cooling vein is backwards. “
Sounds like they installed the hat on the wrong side of the rotor by mistake. This is definitely wrong. I would contact whoever you purchased from and get a replacement.
Any updates on the rotor's vane direction? There is a picture of them on the vendor forum that shows them with different direction vanes for each side.
Nice write up. I went with the cheaper Powerstop slotted and drilled rotors. Will see how they do. Went with the Carbotech XP12/10 combo for pads. Also installed the Paragon harness bar with the Sparco belts. Castro SRF brake flush. Looking forward to next track event at Blackhawk Farms in 2 weeks.
The socket for the special front brake nut is a $13 part from Amazon:
Very interesting settings: they are very "Free" of scrubbing factors as used by Formula Fords. The car is set to go as fast as it can on the straights. The small negative camber settings tell that Chevrolet has designed in the correct camber gain when street cornering.
In all it looks to be a very "low drag" setup with enough camber for cornering and minimal tire wear.
My only question is what have others found about negative camber setting best for track days?
if your final camber is -1.5F, -1.1R you will have a miserable track day. it will push like a tuna boat in a hurricane on corner entry and oversteer on exit. the factory-recommended track settings are a great start, especially with the soft bushings.
Any updates on the rotor's vane direction? There is a picture of them on the vendor forum that shows them with different direction vanes for each side.
So glad you asked. I misunderstood my installers feedback. The OEM rotor was wrong. Possibly the hat on wrong side of disc. The Girodisc rotors are correct.
if your final camber is -1.5F, -1.1R you will have a miserable track day. it will push like a tuna boat in a hurricane on corner entry and oversteer on exit. the factory-recommended track settings are a great start, especially with the soft bushings.
Great feedback. Thanks for input. What should we shoot for?
So glad you asked. I misunderstood my installers feedback. The OEM rotor was wrong. Possibly the hat on wrong side of disc. The Girodisc rotors are correct.
I think the OEMs come like that from the factory (wrong on one direction, correct on the other); they come with one part number if I recall. This is not the first car GM did that (Camaro, C7, etc. also had the same thing).
Great feedback. Thanks for input. What should we shoot for?
the track day recommendations in the owner's manual are a great start. you will have an enjoyable track day with those settings. GM did their homework.
At race, alignment, brake shop. Install pics
