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Race Prep Miata race-only chat. 949 Racing - Rim & tires

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Old 05-29-2012, 01:44 AM   #121
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Old 05-29-2012, 07:40 AM   #122
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hey this question is more for Handy Man and lightyear, did your set change from lets say before splitter and wing to after, did you lower ride height or add rake to help with aero or did u leave the setup as is,
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Old 05-29-2012, 09:02 AM   #123
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I have not changed suspension settings. But I am still playing around with it. Basically will go off tyre temp readings, lap times, etc. And make adj. The local track is very rough, but in a month I will be at Phillip island track, and can really play with all the aero/ chassis. It's a fast and smooth track. About 2 minute track, with a very high top speed coming onto a long straight, then into a very fast turn 1. Good for seeing results for tuning of aero.
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Old 05-29-2012, 09:41 AM   #124
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You probably don't want to change your setup to help with the aero (except maybe lowering ride height), you want to change your setup to better take advantage of it's effects.

If the aero is working worth a damn your suspension will see a higher load, so stiffer springs might be a good idea.

It also might be a good idea to actually run a higher ride height. With the airdamn/splitter you can still close the gap between the car and the road, and with a higher ride height your suspension geometry may be less compromised... but I haven't looked into Miata suspension geometry enough to know for sure how lowering effects it, I'm sure someone else here can comment on that.

The splitter does have a LOT of red paint on the underside from rubbing on curbing

P.S. I'd recommend using jam nuts or some other locking mechanism on your turnbuckles. I had mine loosen up a lot during a single session. If I'd stayed out much longer I may have lost the splitter.

Last edited by Handy Man; 05-29-2012 at 09:59 AM.
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Old 05-29-2012, 10:29 AM   #125
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Our STL Miata at Gateway Motorsports Park. Wing is APR "SCCA Spec" Splitter is custom built to SCCA STL rules

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Old 05-30-2012, 03:06 AM   #126
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[QUOTE=Handy Man;882835]You probably don't want to change your setup to help with the aero (except maybe lowering ride height), you want to change your setup to better take advantage of it's effects.

If the aero is working worth a damn your suspension will see a higher load, so stiffer springs might be a good idea.

It also might be a good idea to actually run a higher ride height. With the airdamn/splitter you can still close the gap between the car and the road, and with a higher ride height your suspension geometry may be less compromised... QUOTE]

Agreed, especially if you have no flat undertray in the center. Running a higher ride height with a rough undertray (as the stock miata has) will reduce the positive lift effect it produces. Ideally you want the splitter 3" off the ground. Too low and the ground effects begin to trail off and become negated. Too high and you're not "choking" enough air to create a lower pressure area under the car. Remember, the ground and the car need to form a venturi tube.
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Old 05-30-2012, 08:05 AM   #127
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Agreed, especially if you have no flat undertray in the center. Running a higher ride height with a rough undertray (as the stock miata has) will reduce the positive lift effect it produces. Ideally you want the splitter 3" off the ground. Too low and the ground effects begin to trail off and become negated. Too high and you're not "choking" enough air to create a lower pressure area under the car. Remember, the ground and the car need to form a venturi tube.[/QUOTE]

I dont know, i say even without an undertray you will see some gains by just the fact that u lowered the car and you are controlling airflow under it with a splitter. Alot of guys on this thread have said that they have run lower that 3" with out any ill effects, bear with me hear for a moment, when u lower the car at all with splitter or not ur basically creating this venturi if the car is flat ie; same ride height all 4 corners, because of the shape of the front bumper of the Miata it will naturally have some lift but if u raise the rear of the car thereby using the front bumper as the choke point then u will see gains, ever notice how nascar did it before they went to the setup they have now they didnt have flat bottom cars they used a higher rear bumper as part of their areo package.
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Old 06-05-2012, 05:54 PM   #128
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Quote:
Originally Posted by Edens View Post
Our STL Miata at Gateway Motorsports Park. Wing is APR "SCCA Spec" Splitter is custom built to SCCA STL rules
you should post some pics of the splitter you built for my car
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Old 06-06-2012, 06:21 PM   #129
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Not the best pics, but here you go. Built to SCCA SSM specs (6" past front bumper) will have front supports to help support the front. Also goes all the way back to centerline of front axle and as wide and will fit between tires at full lock.





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Old 06-06-2012, 06:32 PM   #130
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Quote:
Originally Posted by Edens View Post
Our STL Miata at Gateway Motorsports Park. Wing is APR "SCCA Spec" Splitter is custom built to SCCA STL rules

Hey, I 've seen that car at Hallett.
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Old 06-06-2012, 07:29 PM   #131
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You are going to need a serious wing for that front splitter. I never have understeer on fast corners, only over steer. So a standard sized splitter to stop lift is all i think most people will need.
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Old 06-06-2012, 08:02 PM   #132
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Edens, that splitter is freaking huge.
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Old 06-07-2012, 05:11 AM   #133
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Pikes peak edition?
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Old 06-07-2012, 01:41 PM   #134
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Crazy talk Street Mod edition.
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Old 06-07-2012, 02:11 PM   #135
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You do have to remember that at 30-65 MPH, you're going to need all the downforce you can get.
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Old 06-07-2012, 02:26 PM   #136
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And SSM runs wings that look like
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Old 06-07-2012, 05:25 PM   #137
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Yea. In SSM for autox drag is of 0 concern. You should already be making more power than you can put down 90% of the time, so all you care about for aero is max downforce.
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Old 06-09-2012, 04:38 AM   #138
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Quote:
Originally Posted by Handy Man View Post
Handy Man - quick questions for you or anyone else who built an air dam like yours:

Do you just rivet it on over the OEM bumper or do you cut the lower part of the bumper cover out? Do you put any material to back the rivets or is the skin strong enough? I've seen Crusher in person and Emilio left the bumper cover underneath but Crusher is in a more constant state of evolution. I'm going to replicate something similar to what you did when I can scrape the cash together to get a wing. I don't see much point until then since my a** would just beat me to the corner exit on a regular basis... Thanks!
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Old 06-09-2012, 05:33 AM   #139
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Old 06-09-2012, 09:39 AM   #140
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12mm birch water cut, 2 - 8mm threaded rod front supports, 2 - 1" x 1/8" metal bar supports behind bumper between fog light holes and mouth, 4 - 10mm bolts to the subframe. Extends to the rear of the front lower control mounting point. I can stand on it.





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