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 Suggest me some cornering grip improvements... 
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Joined: April 13 2007, 12:34 AM
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Post Suggest me some cornering grip improvements...
After lapping yesterday I'm now trying to figure out a way to make my car handle better on the track. MX-3, Being a FWD car, does understeer a bit. I don't have coil-overs or adjustable shocks, so I'm guessing stiffer rear swaybar might be my only option as far as suspension goes. I played around with tire pressure and having more inflation in the front did reduce the understter somewhat.

But that's not even the main issue. I can kind of compensate for understeer by adjusting my racing line. The biggest issue was with tire grip. I'm running BFGoodrich T/A KDWs, which are fantastic for performance street tires, but 205 wide on 6.5" wide wheels isn't a lot of horizontal contact patch. I'm looking at some BFGoodrich R1s or Hoosier R6 competition tires, and I'm not sure which to get and what size. Should I also get wider wheels? I think so. How wide should I go? 7? 7.5? I don't know if I want to go 8, because that's probably extra weight. What wheel width would be optimal for 225 wide tire?

Thanks.


September 13 2007, 5:55 PM
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7.5 inch wide wheel at most. I would also say 215 at most- I bet a 225 rubs the strut.
Get a Whiteline rear sway bar, replace as many of the stock susension bushings as you can afford. Get new sway bar links. Get adjustabel struts and good stiff springs. If you buy some coilover that uses Eibach springs you can get any spring rate you want (GC coils use Eibach springs). You can choose a spring rate that will help on the track, but the stiffer the spring the more uncomfortable the car will be day to day. A roll cage is another good idea, Auto Power makes several that will bolt or weld into the MX-3.

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September 14 2007, 10:09 AM
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hey pat.
you got the link to Auto power for the cages?

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September 14 2007, 12:37 PM
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I'm not competing so I probably won't go as far as rollcage and coilovers yet, but adjustable struts might be a good idea to stiffen up the suspension a bit. I'm running on H&R springs, which are a pretty good balance between street comfort and track performance. I do want the car to remain a daily driver, so I don't want to go crazy with suspension. Whiteline rear swaybar is very likely, though. Bushings are pricey, so I'll hold off on those. My current ones seem to be in ok condition. Only the swaybar bushings were worn, so those got replaced a few months ago.

Competition rubber is damn expensive, but I think that would be the best upgrade and would raise my grip limit the most. I could fit 225s if I get the correct offset on the wheels. My fenders are already rolled, so there's room. Would it make sense to have wider tires in the front? You know, to add more bite and decrease understeer? Or am I smoking crack here?


September 14 2007, 4:27 PM
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Sure 225's would fit with the right offset or even a spacer.

also a Rollcage will help alot. It will structurally stiffen the whole chasis. just get something like an 8point and don't install the sides so its easy to get in and out off.Replace every bushing in your suspension with aftermraket ones. or even new oem ones will help a bit

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September 14 2007, 5:46 PM
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I think it is AutoPower.com and they have links to the retailers.

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September 15 2007, 4:18 AM
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Went there, didn't find much.

What about this, though:

http://www.autopowerindustries.com/rollcages.asp


September 15 2007, 4:42 PM
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^^^^ ya thats the site. i found it.I think they charge alot.

a friend of mine with a civic got one from a company called S&W Race cars for $179 and i've seen it its really nice. But they don't make one for the mx3. I've checked there site and found one fro the mx6. I personally don't think its going to fit although couild be close. They do have one for 91-96 Escort. I have more faith in that one fitting but I am not sure. the roof in the mx3 I do beleive is lower.

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September 15 2007, 5:25 PM
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Yeah, I'd feel sketchy about trying to plug in a cage built for a different car.

If you're gonna modify it to fit, might as well build your own cage.


September 15 2007, 11:20 PM
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