Originally posted by StevieB
The calipers are different sizes.
You shouldn't need vented discs as it's all about mass v velocity v friction etc., and nothing to do with engine size/power.
I don't necessarily agree with that, if you have two cars that are the same weight but one has an engine that is twice the power (and as a general rule of thumb CC's equlas more power, especially if you are American), then on any given straight bit of road you will be able to achieve a much higher speed and therefore the retardation required before the next corner will be higher which will generate more heat.
Cheers Mike
NS Dev - 9/11/06 at 10:56 AM
But on most sevens solid discs will be fine. If the weight gets up to the high 600kg - 700kg mark then vented ones may well be useful.
As was mentioned, get some decent pads in it.
In my opinion, humble as that is, there is only one choice of pad for road use and that is the Mintex 1144 compound, forget the other variants,
including various strangely coloured items, the mintex ones are superb.
Bob C - 9/11/06 at 10:57 AM
It's right by my reckoning too. On maximum go, you should be accelerating at full power or braking fully (this is my simple world - bear with
me....) If we assume then that you're 50% of the time accelerating and 50% of the time braking then the brakes have to dissipate half the rear
wheel horsepower.. car weight doesn't come into the equation!
That's the "fade" side of the problem (average dissipation), there are other issues: consider a sudden stop from high speed - the
resulting thermal shock in the discs, in the light car (with low top speed) will be much less stressful on the discs than the original tintop
Bob
iank - 9/11/06 at 10:58 AM
quote:
Originally posted by quadra
quote:
Originally posted by StevieB
The calipers are different sizes.
You shouldn't need vented discs as it's all about mass v velocity v friction etc., and nothing to do with engine size/power.
I don't necessarily agree with that, if you have two cars that are the same weight but one has an engine that is twice the power (and as a general rule of thumb CC's equlas more power, especially if you are American), then on any given straight bit of road you will be able to achieve a much higher speed and therefore the retardation required before the next corner will be higher which will generate more heat.
Cheers Mike
If you read carefully he said that - "mass v velocity v friction"
Edit - quoting fixed
[Edited on 9/11/06 by iank]
JoelP - 9/11/06 at 12:35 PM
quote:
Originally posted by Bob C
It's right by my reckoning too. On maximum go, you should be accelerating at full power or braking fully (this is my simple world - bear with me....) If we assume then that you're 50% of the time accelerating and 50% of the time braking then the brakes have to dissipate half the rear wheel horsepower.. car weight doesn't come into the equation!
That's the "fade" side of the problem (average dissipation), there are other issues: consider a sudden stop from high speed - the resulting thermal shock in the discs, in the light car (with low top speed) will be much less stressful on the discs than the original tintop
Bob
IMHO, you are on the right tracks, however its not a totally linear relationship as the lighter car will accelerate faster and loose more of the total work output of the engine to drag, hence the front brakes dont do all the work themselves.
Get yourself some mintex pads, you wont notice fade anyway.
Not saying that others do fade, but mintex definately dont even on track at speed.
NS Dev - 9/11/06 at 12:42 PM
did you use the mintex's on your track machine Joel? If so, they are rather good aren't they!
Stu16v - 9/11/06 at 10:00 PM
quote:
Originally posted by CaLviNx
Hi
Some (like me) are thinking of going from vented to solid discs, I feel that with the weight of a "7" you just wont get enough heat into the vented setup to make it work 100% so methinks a set of willwoods and solid discs is next in line to be fitted.
Others (like me) wouldn't of bothered fitting them in the first place...
Possibly something like a Dax Quadra with a stonking engine would make use of vented discs. Fast, and not the lightest sevenesque ever built. But for the rest of us, solids will do just fine.
As for pads, as Nat et all say, Mintex 1144 are damn fine - but they *can* be overcooked on a track. Swap em for Ferodo 2500's however, and your problems have gone forever...