Toyota MR2 Message Board - View Single Post - 3S-GTE JDM 3rd Gen Turbo Engine NEED measurement of gen3 rear brake disc

CJMR2T · 10-29-2009, 03:18 PM

Oteck, I dont know how well you brakes compaired to what it should, but from the looks of your setup, the natural bias is off to the front too much (roughly 10% from quick calcs) your setup is somewere real close to 70/30 F/R where as a stock MR2 setup is right at 60/40 F/R....

If you are running more more tire (width wise) compaired to stock and its been lowered, then it would benifit from even more rear bias...... Remember, more tire mean more grip and lower Cg (center of Gravity) means less weight transfer and less weight trasfer mean less vertical load on the fronts and more on the rears during braking over the stock Cg.. Thus having too much front bias is only going cause the front tires to be over worked and locked up sooner then they should and the rears under worked.

Here is an example, My MKIII supra. In stock form, had a natural bias of 72/28 F/R

Stock with 225-50-16 (Falken FK-452) had a 60-0 of 128ft

Lowered (1.75") with 245-45-17 front and 285-35-18 rear and stock brakes had a 60-0 of 116ft (12ft drop)

Same as above (lowered and wheel / tire) but with a custom 13" 6pot front setup and a 13" 4pot rear set up sized to give a natural bias of 65/35 F/R that I built and this dropped my 60-0 down to 99ft (17ft drop over no BBK's and 29ft over stock setup and tire size)

As for the Mechanical Spot calipers. Unless you dont mind rattling sounds, I would stay away from them. The rattle like crazy and that is one of the main reasons why Wilwood stopped producing them and sold off the Rights to the design.

Im trying to work out some mounting detials to run a mini drum for parking similar to say the supra's, Lexus's, etc........ I was going to use a Brembo parking caliper, but they are way to expensive (more then the regular calipers im going to be using)...

10-29-2009, 03:18 PM	#8 (permalink)
CJMR2T Fabricator Join Date: Oct 2009 Location: Lakeland, FL Posts: 3,683 Thanks: 3 Thanked 355 Times in 336 Posts iTrader Rating: (4/100% )	Oteck, I dont know how well you brakes compaired to what it should, but from the looks of your setup, the natural bias is off to the front too much (roughly 10% from quick calcs) your setup is somewere real close to 70/30 F/R where as a stock MR2 setup is right at 60/40 F/R.... If you are running more more tire (width wise) compaired to stock and its been lowered, then it would benifit from even more rear bias...... Remember, more tire mean more grip and lower Cg (center of Gravity) means less weight transfer and less weight trasfer mean less vertical load on the fronts and more on the rears during braking over the stock Cg.. Thus having too much front bias is only going cause the front tires to be over worked and locked up sooner then they should and the rears under worked. Here is an example, My MKIII supra. In stock form, had a natural bias of 72/28 F/R Stock with 225-50-16 (Falken FK-452) had a 60-0 of 128ft Lowered (1.75") with 245-45-17 front and 285-35-18 rear and stock brakes had a 60-0 of 116ft (12ft drop) Same as above (lowered and wheel / tire) but with a custom 13" 6pot front setup and a 13" 4pot rear set up sized to give a natural bias of 65/35 F/R that I built and this dropped my 60-0 down to 99ft (17ft drop over no BBK's and 29ft over stock setup and tire size) As for the Mechanical Spot calipers. Unless you dont mind rattling sounds, I would stay away from them. The rattle like crazy and that is one of the main reasons why Wilwood stopped producing them and sold off the Rights to the design. Im trying to work out some mounting detials to run a mini drum for parking similar to say the supra's, Lexus's, etc........ I was going to use a Brembo parking caliper, but they are way to expensive (more then the regular calipers im going to be using)...