Brake upgrades (Page 2/3)
skywurz FEB 19, 11:15 PM

quote
Originally posted by fieroguru:


Stock 15" wheel with a 215/60/15 tire is ~ 40 lbs. This is really the benchmark of wheel/tire weight for performance.




Technically on 88 the front should be 205 with a narrower wheel so the front weight would be less. But im nit picking great layout!
fieroguru FEB 20, 07:08 AM

quote
Originally posted by skywurz:
Technically on 88 the front should be 205 with a narrower wheel so the front weight would be less. But im nit picking great layout!



Yes, the stock 88 15" wheels have a staggered width and the fronts are narrower, but the overall weight is the same.
The difference in tire weight between the 205/60/15 and the 215/60/15 is about 1 lb. The narrower 88 front 15" wheel weighs about 1 lb more than the 15" rear wheel due to having a wider flange on the inside surface of the wheel.

I chose to focus on the rear 15" wheel as it is virtually the same across the 88s and non-88s (main difference is placement of the valve stem) so a good comparison could be made with the weight difference between it and some really large/wide wheels/tires.

Here is a picture of this wider inside reinforcement on the 88 front (it also makes fitting larger rotors front/rear more of a challenge as things fit the rear, but won't fit the front due to this wider rib).


Here is the rear for reference:

[This message has been edited by fieroguru (edited 02-20-2021).]

skywurz FEB 20, 01:12 PM
Thanks for that ***The more you know*** My front's just always felt lighter to me i never actually weighed them.
cvxjet FEB 20, 03:49 PM
You need to balance between added weight and performance- If you are on a flat track and doing multiple laps, then BIG brakes will help you. But if you are driving on streets and every so often do a little performance driving, then the stock brakes are ok.


I have 88 calipers front and rear with 12" and 10.5" vented discs.....I go up Mines road or Redwood road and crank thru some curves, of course using the brakes but I only drive hard for maybe 5-10 minutes at a time. Never noticed any fade- even with the original solid disc brake system.

My wheels are 16 x 7 and my tires are the aforementioned General G-Max 205/55 and 225/55.......Weight is 36 lbs for each front and 38 lbs for each rear. The FEEL of the car is much better than when I had the heavier 15 x 7 wheels and 215/60 and 225/60 BFG tires (approx' 42 front and 43 rear)....The car used to feel club-footed but now feels very good- agile....And a professional driver tested my car and was actually impressed.

We tend to always think "BIGGER is BETTER!!!" and sometimes that is true- but remember what Colin Chapman (Of Lotus) used to say; Add Lightness

Think of the really dumb guys nowadays that install "dubs" on their cars....I have seen a couple of these sitting on the side of the road because an axle/spindle broke- They don't drive worth a crap! Or how about those guys who don't just lower their car- they LOWER!!! their car, until the tires are rubbing, the suspension bottoms all the time, and their wheels stick out at 30* angles...Anyone who knows suspension knows that those extremes are absolutely idiotic.

Here is a pic of my car as it looks now.....It could have 12" discs all around but I kept the 10.5" Fiero discs in the rear to save some weight (Even Porsche 911s have smaller disc in back)

[This message has been edited by cvxjet (edited 02-20-2021).]

Daryl M FEB 20, 09:22 PM
My project car was purchased in pieces, so I was missing brakes to begin with. I don't know how much a stock 88 rotor weighs, but the Chevy Terrain 13" rotors I am considering are about 17 pounds each. Add the caliper adapter plates and the weight goes to about 70 pounds for 4. How does that compare to 4 stock rotors?
fieroguru FEB 20, 09:51 PM

quote
Originally posted by Daryl M:

My project car was purchased in pieces, so I was missing brakes to begin with. I don't know how much a stock 88 rotor weighs, but the Chevy Terrain 13" rotors I am considering are about 17 pounds each. Add the caliper adapter plates and the weight goes to about 70 pounds for 4. How does that compare to 4 stock rotors?



Stock 88 brake rotors are about 11 lbs. So a 17 lb rotor is 6 lbs heavier per corner.

I suspect you are looking at the 13" Traverse rotor (my 13" kit was developed using this rotor - GM Lambda platform) as the Terrain rotors are only 12" in diameter and the rears are too deep to be used on the 88s and the fronts are too thick to work with the stock 88 calipers.
Daryl M FEB 20, 11:35 PM

quote
Originally posted by fieroguru:


Stock 88 brake rotors are about 11 lbs. So a 17 lb rotor is 6 lbs heavier per corner.

I suspect you are looking at the 13" Traverse rotor (my 13" kit was developed using this rotor - GM Lambda platform) as the Terrain rotors are only 12" in diameter and the rears are too deep to be used on the 88s and the fronts are too thick to work with the stock 88 calipers.



You are correct. I ordered and drilled the rotors and they seem to fit nicely. My tire/wheel combo weighs 49 pounds R 255-45r18, and 42 pounds F 225-45r18. I don't know how that compares to stock wheels/tires.
fieroguru FEB 21, 08:08 AM
The stock 15" wheels and tires are about 40 lbs. per corner.
cliffw FEB 21, 07:38 PM
I don't usually weigh in here nor offer advice, and rarely ask for it.

From our "Mall", years back.

Bigger Brake Booster ($100 brake upgrade)

I forget the exact user name of this forum that made me aware of it FieroSE I think, no, ? "Darkrams" I dunn know.

He had a North Star mod and he swore by it. How much weight and balance could a brake booster cause ?
Daryl M FEB 22, 01:54 PM

quote
Originally posted by cliffw:

I don't usually weigh in here nor offer advice, and rarely ask for it.

From our "Mall", years back.

Bigger Brake Booster ($100 brake upgrade)

I forget the exact user name of this forum that made me aware of it FieroSE I think, no, ? "Darkrams" I dunn know.

He had a North Star mod and he swore by it. How much weight and balance could a brake booster cause ?



The brake booster doesn't really improve braking. You still have stock brakes, you just have more help pushing the pedal. If you want to actually improve braking and reduce brake fade, you have to disapate heat and increase the diameter of the rotor or increase the pressure without increasing stored heat. That is why performance cars have larger diameter vented rotors .

[This message has been edited by Daryl M (edited 02-22-2021).]