![]() Racing Beat 1.125 hollow front bar with the block/bolts brace kit.It might be worth borrowing a shock tower brace, doing a 60 second installation and see if it makes a discernible difference. That means you're at the upper end of your weight class already, so trading 40 lbs for an inch of tire width and more power might be worthwhile even without any increase in chassis rigidity.Īre you allowed to do zero weight modifications such as seam welding? That can make quite a difference on the door opening and should be useful on the tunnel-to-bulkhead junctions.ĭo you believe the flex you're experiencing is between the bulkheads or could it be ahead of the firewall? You've got a hardtop so you've already closed the box a little on the cockpit and you've got a lot of front roll stiffness. Is reaching 2250 lbs plausible given your basic weight reduction mods? That's over 100 lbs of weight loss, which is fairly difficult for a car that's fairly pared down to start. It's hard to tell since you're quite vague about what you've actually done, but could it be something as simple as a set of shagged out control arm bushings? Can you expand on "unsettled" and maybe define just what you've done for setup? Track is a little less clear, though, as you're dealing with higher speeds where it's not all about transitions. Option 3: GRM comes up with something I haven't considered.įor autocross, you want to be as light as possible even if the doors are popping open mid-run. Option 2: At 2250lbs, I am at the ragged edge of weight reduction inside the rules and my current power is still legal (could actually add a couple ponies), but I continue to deal with the famous Miata noodle-chassis. Option 1: At 2400lbs, I can run wider tires (257mm template instead of 226mm), add a little power, and I will have room in the weight to add door bars for chassis stiffness (aftermarket frame rails are not allowed). This did reduce my confidence in these turns. I attribute this to un-damped chassis flex since my roll stiffness is biased heavily to the front of the car. It feels very unsettled in quick transitions despite having the typical Miata formula for good springs/dampers/sway bar. It has your basic Miata weight reduction mods, a hardtop, and a roll bar. I have a NB1 Miata that I run in NASA TT5. It does not store any personal data.While stiffness and weight reduction have been discussed at length on their own, I have had trouble finding information on finding a balance between the two. ![]() The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly.
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