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The Terminator
Terminator Talk
Installing ATS Brembos on the Cobra.
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<blockquote data-quote="cj428mach" data-source="post: 16365923" data-attributes="member: 142081"><p>I was reading on another forum about the ATS calipers and the bias issue it causes. This was posted.</p><p></p><p>Baer offers an "upgrade" for the '94-04s to go to 13.25" rear rotors with the stock calipers. Working through the math and making some assumptions about effective rotor diameters, I get:</p><ul> <li data-xf-list-type="ul">With 13" rotors and PBRs up front (with 38mm pistons), installing the 13.25" rear rotors would shift bias ~14% to the rear. I believe I've seen these larger rear rotors brought up in threads in the past, and it has been pointed out that installing them with stock fronts is <em>not </em>a performance upgrade.</li> <li data-xf-list-type="ul">With 13" rotors and Caddy Brembos up front (with 42mm pistons) + stock Cobra rears (11.65" rotors, 38mm Vargas), the bias would be shifted ~22% to the front (compared to 13"/38mm PBRs + 11.65"/38mm Vargas), as Jack has said before.</li> <li data-xf-list-type="ul">With 13" rotors and Caddy Brembos up front (with 42mm pistons) + Baer 13.25" rear rotors (with stock 38mm calipers), the bias would be shifted ~5.5% to the front (compared to 13"/38mm PBRs + 11.65"/38mm Vargas). Significantly better than with stock size rear rotors.</li> <li data-xf-list-type="ul">With 13" rotors and Caddy Brembos up front (with 42mm pistons) + 42mm Varga rear calipers on 11.65" Cobra rear rotors, the bias would be essentially the same as a stock Cobra setup.</li> </ul><p>Ok so the stock caliper on a 13" rotor on the rear improves the bias without the extra volume to maybe cause master cylinder issues. This seems like something worth pursuing. </p><p>Baer sells rotors separately so the issues will be </p><p></p><p>1. will a gt based rotor fit an irs hub?</p><p>2. What will it take to position the caliper in the correct location on the irs?</p><p></p><p>Rotors are going to be under $150 so if we can get a caliper bracket made it might not take much to do this. Any thoughts?</p></blockquote><p></p>
[QUOTE="cj428mach, post: 16365923, member: 142081"] I was reading on another forum about the ATS calipers and the bias issue it causes. This was posted. Baer offers an "upgrade" for the '94-04s to go to 13.25" rear rotors with the stock calipers. Working through the math and making some assumptions about effective rotor diameters, I get: [LIST] [*]With 13" rotors and PBRs up front (with 38mm pistons), installing the 13.25" rear rotors would shift bias ~14% to the rear. I believe I've seen these larger rear rotors brought up in threads in the past, and it has been pointed out that installing them with stock fronts is [i]not [/i]a performance upgrade. [*]With 13" rotors and Caddy Brembos up front (with 42mm pistons) + stock Cobra rears (11.65" rotors, 38mm Vargas), the bias would be shifted ~22% to the front (compared to 13"/38mm PBRs + 11.65"/38mm Vargas), as Jack has said before. [*]With 13" rotors and Caddy Brembos up front (with 42mm pistons) + Baer 13.25" rear rotors (with stock 38mm calipers), the bias would be shifted ~5.5% to the front (compared to 13"/38mm PBRs + 11.65"/38mm Vargas). Significantly better than with stock size rear rotors. [*]With 13" rotors and Caddy Brembos up front (with 42mm pistons) + 42mm Varga rear calipers on 11.65" Cobra rear rotors, the bias would be essentially the same as a stock Cobra setup. [/LIST] Ok so the stock caliper on a 13" rotor on the rear improves the bias without the extra volume to maybe cause master cylinder issues. This seems like something worth pursuing. Baer sells rotors separately so the issues will be 1. will a gt based rotor fit an irs hub? 2. What will it take to position the caliper in the correct location on the irs? Rotors are going to be under $150 so if we can get a caliper bracket made it might not take much to do this. Any thoughts? [/QUOTE]
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Installing ATS Brembos on the Cobra.
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