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Old 08-26-2013, 09:04 AM   #81
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Quote:
Originally Posted by hingstonwm View Post
Been a while since I posted, finally have some information on th13-15 comparison The short and sweet answer when going from 15's to 13's is you ruin the handling. Even though the control arms don't change angle, roll center is changed due to the entire suspension being moved closer to the ground. The result is a big push and slower lap times. You can tune around the push some by dialing in a bunch of compression in the front shocks and stiffening the rear bar but it is still noticeable.

I have not given up on the 13's yet and plan on making a spring rate change to see if I can help the car. Have also been prepping for the Runoffs, this will be the last year at Road America, it is the 50th anniversary and there are just short of 700 entries, it should be a great event. Next year the Runoffs are at Laguna and the year after that at Daytona.

Interesting. I'm guessing an alignment change of some sort should fix the push? Might require a pickup point change?
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Old 08-26-2013, 09:17 AM   #82
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Hmm, the raised RCs (all else being equal) might explain the strange feeling that 225/50-15 is slower than 205/50-15 even on small tracks.
No, all else is not equal (gearing, sidewall yada yada), but the RC change is something that isn't obvious. And no, 225/45 is not available in useful rubber here. 580 in diameter is still the sweet spot...

The push could not be negotiated by increasing the rake a bit?
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Old 08-26-2013, 11:29 AM   #83
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Originally Posted by hingstonwm View Post
Have also been prepping for the Runoffs, this will be the last year at Road America, it is the 50th anniversary and there are just short of 700 entries, it should be a great event. Next year the Runoffs are at Laguna and the year after that at Daytona.
Good luck this year!

I'll be running two classes, T3 and STL. Both of my cars still need a ton of work...

It should be a pretty awesome year for the Runoffs, the entries are definitely way up compared to last year.

Where do you usually paddock? I'll have to try to stop by and say hi.

Cheers
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Old 08-27-2013, 01:05 PM   #84
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Yes, that is the Jesse Prather Motorsports dampener. I had Jesse build an engine for me this season, Im hoping the extra power will translate to faster times and a better finish at the Runoffs.
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Old 08-27-2013, 01:36 PM   #85
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Quote:
Originally Posted by tpwalsh View Post
Interesting. I'm guessing an alignment change of some sort should fix the push? Might require a pickup point change?
Per the rules pickup points can't be relocated, so I need to look elsewhere to fix the push.

Quote:
Originally Posted by Efini~FC3S View Post
Good luck this year!

I'll be running two classes, T3 and STL. Both of my cars still need a ton of work...

It should be a pretty awesome year for the Runoffs, the entries are definitely way up compared to last year.

Where do you usually paddock? I'll have to try to stop by and say hi.
Cheers
You should definitely stop by, I will be easy to find, paddock space is below the gearbox end of the row closest to the hawk bridge. When you come up the hill from the tunnel take the first left, I have pit space in the Lester building/garage port, I am in the end space closest to turn 14 and on the side next to to the front straight.

Look forward to meeting you.

Quote:
Originally Posted by NiklasFalk View Post
Hmm, the raised RCs (all else being equal) might explain the strange feeling that 225/50-15 is slower than 205/50-15 even on small tracks.
No, all else is not equal (gearing, sidewall yada yada), but the RC change is something that isn't obvious. And no, 225/45 is not available in useful rubber here. 580 in diameter is still the sweet spot...

The push could not be negotiated by increasing the rake a bit?
Went up 4 turns in the back to increase rake, tightened the rear bar and dialed in 1 click shy of full compression on the shocks at the last race it helped a little bit but not enough. Since the last race, I have made a substantial spring change to both ends of the car looking for more balance and I returned compression to the middle setting. I will be using the last race weekend as a test and tune for the Runoffs and have a test day out there as well. Hopefully, I can get the car working prior to qualifying.

You are right about gearing, I used 2 different diffs, a 4.78 for the 15's and a 4.30 for the 13's both use rx7 lsd's. Changing gearing changes lap times but has only the very minutest of effects on handling. There is a slight sidewall difference, the 15 is 0.1 " taller than the 13, I can't see 0.1 " being the cause of the new push. I found an app online that allows you to enter in your suspension measurements, then it shows static roll center. When using the app and changing just wheel/tire diameter the roll center moved from above ground to below ground, If nothing else is changed in the car this movement of roll center will result in push. If I can't get the car working properly I will ditch the 13's and run 15's at the Runoffs.
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Old 10-15-2013, 12:31 PM   #86
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Bumping this old thread.

What flywheel is it that you are using?
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Old 10-15-2013, 01:15 PM   #87
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Hey, sorry I never made it by your paddock spot. I was so friggen busy all week, it was insane.

Never run two cars at the Runoffs, it's a terrible idea.

So how'd you end up doing? I heard about all the drama at the front of the FP field, but didn't see where you ended up.

I hope Greg Ira enjoys his paper championship...
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Old 10-15-2013, 01:55 PM   #88
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That was a BS penalty on Reynolds.
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Old 10-15-2013, 05:31 PM   #89
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That was a BS penalty on Reynolds.
QFT



Supposedly the penalty was the result of the two "incidents", the one on the first lap and the one on the last lap. Both of which were cry baby wussy incidents. And the two guys that protested him are the biggest d-bags.

So yea, again, I hope Ira enjoys his paper championship. And I hope Downing (or whoever the RX3 driver was) enjoys his paper 2nd place. Everyone who's watched the race, and who was there knows who won the race and who was the best in EP that day.

Wait, brain fart, that was EP. FP race was the Integras 1st and 3rd. Uhhhh, nevermind, nothing to see here.
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Old 10-16-2013, 02:10 AM   #90
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Quote:
Originally Posted by shlammed View Post
Bumping this old thread.

What flywheel is it that you are using?
The flywheel is from Jessie Prather Motorsports, billet steel and weighs about 7.5 pounds, the clutch is 5.5"

Quote:
Originally Posted by Efini~FC3S View Post
Hey, sorry I never made it by your paddock spot. I was so friggen busy all week, it was insane.

Never run two cars at the Runoffs, it's a terrible idea.

So how'd you end up doing? I heard about all the drama at the front of the FP field, but didn't see where you ended up.

I hope Greg Ira enjoys his paper championship...
I finished 5th, was going down towards t-5 making a pass for 4th early in race, and got pushed into the grass, it cost me about 12 seconds, at the time, myself and 4th were about a second behind third. Had the front master cylinder start to go bad during the race and had to back up my braking points., myself and Sam Henry had a good race going with passes back and 4th, he had a wiggle coming out of Canada on the last lap and I got past him going into 13, he got picked by a lapper going into 14 and I held on for 5th


Quote:
Originally Posted by Efini~FC3S View Post
QFT



Supposedly the penalty was the result of the two "incidents", the one on the first lap and the one on the last lap. Both of which were cry baby wussy incidents. And the two guys that protested him are the biggest d-bags.

So yea, again, I hope Ira enjoys his paper championship. And I hope Downing (or whoever the RX3 driver was) enjoys his paper 2nd place. Everyone who's watched the race, and who was there knows who won the race and who was the best in EP that day.

Wait, brain fart, that was EP. FP race was the Integras 1st and 3rd. Uhhhh, nevermind, nothing to see here.
Reynolds was definitely the class of the field in EP
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Old 11-01-2013, 03:09 PM   #91
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Bill - I am starting an FP build on a '91. This may seem like a silly question, but where is the cut made on the A pillar to remove the windshield frame. Like I said, maybe a silly question, but I don't have race car in my area (Ottawa, Ontario) that I can use as a reference point.

Thanks,
Len
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Old 11-05-2013, 09:39 AM   #92
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Very silly question. Cut it at what ever point you deem "right".

Easiest is to cut even with the base of the glass at the same angle as the metal lip towards the interior. Then it is just piano wire to cut the base of the windshield loose. The header and glass all come off as 1 piece. At least this is what I did for my XP autox car.
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Old 11-05-2013, 10:21 AM   #93
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Very silly question. Cut it at what ever point you deem "right".

Easiest is to cut even with the base of the glass at the same angle as the metal lip towards the interior. Then it is just piano wire to cut the base of the windshield loose. The header and glass all come off as 1 piece. At least this is what I did for my XP autox car.
Um, ok, thanks - and I actually thought there were no silly questions... Measure twice, cut once.

I do appreciate the response.
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Old 11-05-2013, 11:29 AM   #94
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Originally Posted by mcfandango View Post
Very silly question. Cut it at what ever point you deem "right".

Easiest is to cut even with the base of the glass at the same angle as the metal lip towards the interior. Then it is just piano wire to cut the base of the windshield loose. The header and glass all come off as 1 piece. At least this is what I did for my XP autox car.
I don't think I can reply to your PM - please email me at ***[email protected]***

Thanks,
Len
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Old 11-05-2013, 03:49 PM   #95
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I find it to be a perfectly valid question as you can't just add it back on if you cut in the wrong spot. If I were doing it, I would be looking for advice on exactly where to cut as well. Having said that, I have seen them cut it all the way at the base of the windshield frame with no bad consequences. This is where I see most cut in the Texas Region.
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Old 11-05-2013, 04:12 PM   #96
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I find it to be a perfectly valid question as you can't just add it back on if you cut in the wrong spot. If I were doing it, I would be looking for advice on exactly where to cut as well. Having said that, I have seen them cut it all the way at the base of the windshield frame with no bad consequences. This is where I see most cut in the Texas Region.
Once the cut is made you are committed to running open cockpit!
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Old 11-05-2013, 04:44 PM   #97
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Actually, one guy welded a windshield back on. I dont understand why you would want to. I have seen unwrecked chassis NA or NB for $500 to a case of beer to just haul this thing away. Unless the chassis has some sentimental value.

Well, I guess if you didnt want to rebuild a cage. I have more $ in my rollbar than it would take to buy another 90 Chassis.
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Old 11-05-2013, 08:45 PM   #98
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I will get a pic of my windshield pillar and post it up later tonight. pPost up any questions you have, I will try to help out if I can.


Attached Thumbnails
New FP miata-windshield_zps92bd60cb.jpg   New FP miata-windshield1_zps7be0622e.jpg  

Last edited by hingstonwm; 11-06-2013 at 03:35 AM.
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Old 11-06-2013, 11:43 AM   #99
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How did you end up finishing at the Runoffs?

Sorry I never made it by your paddock space.
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Old 11-06-2013, 09:45 PM   #100
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Finished 5th, was making a pass for 4th going down towards t-5 and the driver I was passing felt it would be better if I drove in the grass. I got the car gathered up but the incedent cost me about 12 seconds. was about a second behind 3rd at that point. The car had some brake issues latter in the race; pedal got spongy, i probably didnt' get all the air out of the system after changing a brake line that I kinked while doing pads and rotors before the race, that or the front master just went soft. The car was fast all week, but was a handful; to much front end grip, I never got the balance right, I missed some appexs' but had a fairly good drive, no complaints. Looking forward to Laguna next year!
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