Trying to decide on a decent/light 4-pot caliper for the fronts... Wilwood seem best value for money, but their product range is a bit confusing. I get the impression that in the UK it's a choice between Powerlite or Midilite (I think the Midilite is essentially a variant of the US Dynapro, not sure though?).

So, for a 700 kg 7 with 320 bhp, doing trackdays, will the powerlite be enough or do I need to use the midilite?

Interested to hear the experiences of other people with heavy/fast 7s.

I use rx7 fc3 front calipers on my car , they aren't much heavier than the wilwoods I ran before but have a much larger pad and bigger pistons , ebc do all the usual compounds and they stop my car better than the wilwoods did .

perhaps buy a set of second hand MG TF calipers they are four pot and made by AP RACING that is what i shall be using

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Originally posted by Dooey99
perhaps buy a set of second hand MG TF calipers they are four pot and made by AP RACING that is what i shall be using

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Originally posted by Dooey99
perhaps buy a set of second hand MG TF calipers they are four pot and made by AP RACING that is what i shall be using

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Thanks but I'm mainly interested in opinions on the two Wilwood options.

To add on this, the RX7 caliper is very wide on the outside (well both sides, but the inside doesn't matter here). This would require an extreme offset for the brake disc and even then it would hardly fit standard wheels. Nice calipers though.

So also very interested in experience / opinions on powerlite vs dynapro(midilite). Obviously the powerlites are cheaper and lighter, but what about stiffnes/flex, pad wear (volume) etc?

Powerlites too small? Midilites over the top?

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I had them on my GTM Libra. They are VERY heavy. Heavier than standard calipers.

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Originally posted by coyoteboy

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I had them on my GTM Libra. They are VERY heavy. Heavier than standard calipers.

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Thought the TF ones were alloy. You learn something new every day! (crosses them off his list...)

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Originally posted by rodgling
Trying to decide on a decent/light 4-pot caliper for the fronts... Wilwood seem best value for money, but their product range is a bit confusing. I get the impression that in the UK it's a choice between Powerlite or Midilite (I think the Midilite is essentially a variant of the US Dynapro, not sure though?).

So, for a 700 kg 7 with 320 bhp, doing trackdays, will the powerlite be enough or do I need to use the midilite?

Interested to hear the experiences of other people with heavy/fast 7s.

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OK, thanks.

On my car it would be 20% more weight on an open wheeled car (more airflow for cooling), plus I was planning to use vented discs with the powerlites... so cooling would be a lot better.

Would it be better enough is the question though...

This looks worth a read:

http://researchbank.rmit.edu.au/eserv/rmit:6207/Stephens.pdfhttp://resear chbank.rmit.edu.au/eserv/rmit:6207/Stephens.pdf

Probably best to treat the numbers as approximate, but still useful.

"vented discs offered a 40+% improvement in cooling over an equivalent sized solid rotors. The greatest benefit over solid will be where air entering the wheel cavity is limited"

So I guess going from closed-wheel/solid to open-wheel/vented I could expect in the region of 40% more cooling, which is loads.