c7 calipers ended up fitting on the grand am br/o/s. stock c7 rotor with this caliper is 321mm, i see the terrain rotor will be perfect but the buick regal rotor is 345mm. i found a guy with a malibu that swapped from the 321mm rotor to the 345mm with success but they use brembo brakes.

are stock base c7 calipers brembo units?

OP TONGUES MY ANUS

This is your brain on meth.

>>28471499 (OP)
Damn nice upgrade.

>>28471499 (OP)
>on the grand am
But why?

>>28471530
to actually be a car guy and figure shit out instead of recipe modding off a forum without thinking.

bought each wheel for ~90 bucks and after selling the stock wheels ill break about even. 5700$ for a car that doesnt even have a rock chip. this is some of the most fun ive ever had with modding a car.

>>28471610
>$5700 for a Grand Am GT
Jesus, what kinda mileage?

>>28471616
89k.

>>28471499 (OP)
it's on the wrong side, the bleeder needs to be at the top

>>28471622
Not bad on the mileage. Is the interior as clean as the exterior?
>>28471624
I'd assume that was just a mock up pic since the rotor would have almost no swept area like that.

>>28471624
thanks! that makes sense.

>>28471625
the interior is perfect. i wasnt looking for a grand am but I saw this listed and couldnt believe what I saw in person.

this is mock up. I fucked up and bought a c7 rotor but that is 5x118 and this car is 5x115. GMC Terrain is where the wheels are from and the terrain rotor will obviously fit as its the same bolt pattern and center bore and, well, the fucking wheel works. I should have just bought that rotor, its the same diameter as the c7 at 321mm.

I guess my only question itt is does anyone think 345mm rotors will work with the caliper that comes with a 321mm rotor stock. its probably not worth fucking around anymore over the 24mm but this is the fun of the whole thing.

>>28471610
This looks very modern in a good way and is clean. I’m genuinely impressed.

Does it have a sunroof too?

>>28471656
yes, sunroof. and thanks, i spent WAY too much time looking around for oem shit that would work and be tasteful. creating the puzzle and farming out the pieces has been so much fun. next I am going back to the gm parts bin for audio. This has the monsoon sound system which has an external amp instead of one built into the headunit, i just received a second oem amp for 30 bucks that I will wire in parallel and see what it does.

>>28471687
My car has four vintage Hitachi speakers being run through a 2006 era Nakamichi stereo. It sounds abysmal but works until I get some better speakers. Whatever you have is probably better.

>>28471610
why do the doors and panels look all fucked?

>>28471906
turn on your monitor.

>>28471906
That's just GM design. It is supposed to look exactly like that.

>>28471499 (OP)

>>28471610
Based. Good luck with your endeavor fren.

more pics op

>>28473672
what you want?

Today I ordered the caliper bolts and tomorrow I'll order the Terrain rotors. Buick rotors might work but I want to move on to the audio and rear brakes rather than keep fucking around pushing small limits here and there.

I will probably take apart the rear suspension and modify it to get another 3/4" lower out of it. Something needs to be done there.

>>28473879
Im sure your brake booster, proportioning valve, abs unit, and brake peddle leverage arm all work in concert with your new calipers.

Can you imagine street racing a 150hp fwd econobox....in 2025.

>>28474049
Can you imagine being this insecure?

>>28473909
been putting montero and ctsv brakes on dsms for years without issue.

Thats cool OP wait til you find out the brake pressure is the deciding factor in generating stopping friction, ruling out tires, and your stock unit can't make any more friction on bigger rotors pads and calipers if it cant generate the pressure to utilize the surface area.

>>28475518
Torque is force*distance

Pressure and coefficient of friction determine torque, the diameter of the rotor and the average height of the pad determine the distance of the lever arm. By using a longer lever you need less force to achieve the same torque. With a long enough lever arm you can eliminate the brake booster without requiring excessive pedal travel or force. The brake booster is the absolute worst component in the entire car for destroying driving feel, short of full drive-by-wire steering.

>>28471499 (OP)

Excellent work OP, start saving for a 3900 swap

>>28473879
Lets see how clean that interior is.
>>28474049
Ram Air GTs had 175hp and 205tq Anon.
>>28474365
It must be crippling.

>>28475535
Everything you said is wrong about how brakes apply friction. INERTIA TO OVERCOME not torque is relevant to the rotating mass and diameter of the rotor. Bigger rotor = more inertia to overcome. Larger pads/surface area at the same pressure is the same old brake friction. So you have a bigger rotor which gives more inertia but the same applied friction.
The location of the calipers is fucking irrelevant to the generated moment of inertia of the rotating mass. The location of the calipers/pads is relevant to the centripedal force along a given point of the rotor. Bigger rotors means you need more pressure or higher friction coeff pads or both to generate the same braking force.

God damn you dont know shit about shit.

>>28475655
That would only be true if you were trying to lock the brakes with the wheels off the ground and spinning. Braking force is a torque applied to the wheels just like accelerating force.

>>28475655
And if you don't believe me, you can try playing with a brake calculator to see what parameters affect braking force: https://www.tceperformanceproducts.com/dual-bias-calc/

>>28475535
>Pressure and coefficient of friction determine torque
determine force*

who fucking cares if the dude wants big brakes go fuck yourself retard

>>28475655
by this logic, putting wheels on a car that are a few lbs heavier than stock would be a problem.

>>28471499 (OP)
Seems like a waste especially for a grand am. However those things are becoming more and more rare these days. I don't recall the last time I saw one, beaten or otherwise.

>>28475889
Heavier wheels take more effort to accelerate and decelerate Anon. The benefits of lightweight wheels are well documented.

>>28475899
The effect of heavier wheels only shows up on inertia dynos because they rely on measuring the acceleration of a known mass, and heavier/lighter wheels change the mass. It doesn't actually show up on time slips because the weight of the wheel is inconsequential compared to the weight of the entire car. Light wheels are still important for track cars though, because the greater the ratio of unsprung to sprung weight, the harder it is to design a suspension that actually works. This is why live axles have never been popular for track cars compared to drag cars.

>>28475899
so a rotor that weighs 4lbs more is just as bad as a tire that weighs 2-3lbs more. saying a bigger rotor is a problem is like saying putting 32" tires on your jeep is a problem, which we all know it isnt.

>>28475978
>saying a bigger rotor is a problem is like saying putting 32" tires on your jeep is a problem, which we all know it isnt.

>>28475989
so there you go, it works. its going the wrong way in terms of an enjoyable experience, but it works. the guy above crying over the weight of a larger rotor doesnt even compare to the weight of a 32" tire.

>>28475978
>which we all know it isnt.
>>28475998
>its going the wrong way in terms of an enjoyable experience, but it works
Lol, lmao even. What a sad concession. Also, the other guy was talking about the inertia of a larger rotor. Not the effects of added unsprung mass, and I only mentioned wheels Anon.

>>28475899
Who cares bitch
>bigger wheels=taller gearing = better mpgs

>>28476006
you and i have different definitions of the word problem
both examples are unsprung mass with inertia. they are one in the same aside of the location of the weight in relation to the center. adding 20lbs to the tire will have a different affect than adding 20lbs to the rotor.

>>28475998
>>28475989
A larger diameter wheel has the opposite effect of a larger diameter rotor. The larger wheel increases the leverage of the road, which reduces the relative force of the engine and brakes. A larger diameter rotor increases the relative force of the brakes compared to the road.

>>28476025
I'm using "wheel" to refer to the combination of wheel and tire here, which is strictly speaking incorrect but my point still stands.

>>28476025
so then why doesent it that peoples just run a bigger rotor then the tire?

>>28476040
Most cars put the rotor inside the wheel and there also needs to be room for the caliper if it's a disk brake. Drum brakes exist because they can put the the friction surface practically all the way out to the barrel of the wheel, which is why they have a reputation for locking up.

>>28476051
holy fuck man

>>28476051
>which is why they have a reputation for locking up
Not just that but the leading shoe is self-energizing. As it gets pushed into the drum, the shape of the shoe and the drum rotation pulls it even harder into the braking surface. Older cars before power assisted brake systems would use two leading shoes on their front drums to take even better advantage of this.

>>28476064

>>28476064
holy fuck man

>Grand Am
>GMC Wheels
>Corvette calipers
What else will you look at from the GM catalog, some stuff from a cadillac or a saturn next?

>>28476069
Mac, probably rear C7 brakes, brake booster maybe, p.valve maybe. Then it'll be all audio from the GM parts bin running 2x stock amps and weird shit like that. Final is remote turbo and probably HPTuners.

>>28476082
Get an adjustable prop valve unless you have the same weight distribution as a C7. And with the right pad and master selection you can probably get rid of the booster entirely, which does absolute wonders for brake feel.

>>28475694
>Based TCE calculator user
.t knower

>>28475655
cmon anon, this is clearly about heat capacity for his grand am series races!!!!!

>>28471906
Early 2000s GMs all looked like ass, just like what everyone else was making. Still better than the teardrop SUVs we have now though.

>>28471499 (OP)
>Putting any kind of money toward a POS J-body
Are you retarded?

>>28477785
>j-body
That was the Cavi/Sunfire retardAnon.

>>28473909
theres a whole generation of toyota/lexus that uses shitty expensive abs/hydrogen brake booster combos and they're throwing on bigger and bigger brakes for decades
the most ya do is the obvious. fuck up the front/rear brake ratio.

>>28477806
>hydrogen brake booster
Say wat now?

>>28477809
I assume he's phoneposting and meant hydraulic.

>>28477809
nitrogen assisted, sorry. that's what the lil metal canister is in pic related. it's been a minute and i'm Druk
they take literally 30 seconds to fully build pressure when you set the key in the ignition.
a used one goes for bout $200-400, at the stealership? around $3k or more.

>>28477785
Then I'm forgetting whatever it was between the J-body and W-body in size.
Regardless, it's a Grand Am. It's junk and has been junk from day one.

>>28475518
the real thing to worry about is that the brake bias can change with larger brake pistons and the fronts will actually bite sooner and harder and move the bias.

>>28477818
There’s always an asshole like this guy in every thread.

>>28477881

yep, op... great looking GA dude, super clean. dont see them up here in the NE due to salt. cheers

>>28477827
Actually, larger caliper pistons take more fluid volume to move the same distance so they'll bite later and softer, shifting bias to the back.

>>28471530
why the fuck not?

>>28471610
mismatched silver tones always looked bad to me. the wheels being different from the body.

Why would 345 mm fit there. It wont.

>>28477818
https://en.m.wikipedia.org/wiki/General_Motors_N_platform

>>28471499 (OP)
Lookin' good, HotRodder. Take what you got and make it better:)

>>28471499 (OP)
>Retard adds 10lbs of unsprung weight to his shitbox grand am

crazy times man. Retards gonna retard

>>28473879
looks real nice op

>>28478619
Probably weighs the same as his stock brakes, cast iron sliding calipers aren't light.

>>28478619
by this logic every corvette guy should put base camaro brakes on and 15" rims otherwise they're retarded.

i bet you run and workout for hours a day and consume nothing man made then read only science books then maybe if you get laid your fetish is missionary only for the sole purpose of procreation.

>>28479664
Not that anon, but projecting much?
Damn bro

>>28471610
>>28471906
Yeah why does it look like a photoshop lol