drilled rotors and other ?s

darksobsession · 03-05-2009, 03:07 AM

what are the advantages of drilled/slotted rotors?

the gm build book (ecotec pushed to 1400hp) doesn't mention these or swaybars and a few other stuff. are they really necessary?

for these high hp cars does the acceleration increase accordingly or only top speed?

spyhunter was cranking out 500+hp with a turbo and a sc. admittedly, that's a lot (and i dunno if he had the 2.2), but what other mods could he have done to kick it up even more?

what are the gains like as you increase boost? i see some of you guys have around 9 psi and your cars seem fast as shit, but a guy in my class has a vw gti and 31psi and around 400hp. how do yours compare? i guess what i'm asking is what the curve is like as you increase psi.

[ion] C2 · 03-05-2009, 08:46 AM

1. Better cooling, less/no warping, quicker stops (gases/water go through the slots and holes instead of being on the surface making things slippery.

2. GM build book isn't the be-all-end-all for vehicle modification.

3. Of course the acceleration increases. How do you think quarter mile time gets lower as horsepower increases? You're going the same amount of distance in a shorter amount of time.

4. No, spyhunter was cranking out 432whp with a GT30R turbo at around 15 psi. No supercharger. He has the LD9.

5. PSI is a measure of flow resistance, not power. There is no set amount of gains to be had. It depends on what's doing the pressure creation, what engine, and a million other characteristics. You can make 15 psi in a straw, and then 15 psi in a 3" wide pipe, the 3" wide pipe will make more power, a lot more air in that.

Ghadsphi · 03-05-2009, 10:17 AM

Plus if you brake hard it makes a really cool sound.

bnight04 · 03-05-2009, 02:43 PM

dont get drilled/slotted rotors, just got slotted. Drilled suck b.c they crack sometimes...

Ghadsphi · 03-05-2009, 03:03 PM

Technically he's right, depends on what you're doing with them and your inspections.

Cliff8928 · 03-07-2009, 01:17 AM

Quote:

Originally Posted by bnight04

dont get drilled/slotted rotors, just got slotted. Drilled suck b.c they crack sometimes...

Well.. I've had drilled rotors on the Alero for 30k now, no cracks. ALSO. I've had the flat rotors crack on my chevy.

bnight04 · 03-07-2009, 11:25 AM

luck of the draw

Rexter9x · 03-07-2009, 06:01 PM

Ive had my drilled and slotted rotors for 25000kms, no warping/cracking (a first for any vehicle the i have owned, for whatever reason every other car Ive had has had the rotors warp after 2-3 months). They just make abit of noise while braking.

jabartram · 03-07-2009, 06:44 PM

drilled rotors for 50k miles on 3 sets of pads, and no cracks.

darksobsession · 03-11-2009, 06:34 AM

thanks for the replies on the brakes!

i guess what i'm asking about the hp increase is what's the acceleration curve? i don't really care about top speed as much as how fast i can get to fast. what's realistic for a street legal car?

AlbinoMonkeyRat · 03-11-2009, 10:43 AM

depends on who's budget your saying is realistic for a street legal car...
1) if you have 100k, you can buy a Corvette, Viper, or a used Ferrari or Lambo and you would have 0-60 times of less than 5 seconds.
2) if you have 20k, you can buy a used F-body, modify the hell out of the engine and be faster than the previously mentioned cars.

and there are so many possibilities. It really depends on HOW you spend your money. hell, you would save a ton of money doing the labor yourself, so that's more money to parts and tuning.

and for the acceleration...it's all based on a formula...and I forget the formula offhand, but I remember a part of it: it takes twice as much power to move twice as much weight in the same time. so for example, you have a car that weighs 2500 lbs, and it has 150 hp, and it does the 1/4 mile in 16 seconds. If you double the weight to 5000 lb, you would need 300 hp to do the 1/4 mile in 16 seconds.

However, I am unsure if the reverse is true (I doubt 2500 lbs with 300 hp would be an 8 sec car.)

Also, you have to consider friction and aerodynamics. friction is ALWAYS a factor, and aerodynamics comes into play after 30mph. The more ground a car covers, the more friction it will take on, so the 2500 lb/300 hp car is more realistically a 12 second car.

robrage2006 · 03-29-2009, 09:01 PM

I read on a oldsmobile site not sure which one now but they recommended drilled and slotted due to the fact that the stock rotors tend to premuturely warp and wear.