Suspension Crew - Your advice goes here. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-27-2009, 05:25 PM   #21
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

even still. If I was on the street on a perfectly ideal day and taking a fast corner I could loose the rear without warning, now I can go ***** deep without worry, if it starts to step out I can feel it and correct.

I'm pretty sure I can get close to -2.5 now, if not I'll just go for the max I can make. I'm at 12.5" F and 12.75"R.
Braineack is online now   Reply With Quote
Old 07-27-2009, 05:36 PM   #22
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

what kind of toe are you going to run? I've been playing with the idea of zeroing my toe.
wayne_curr is offline   Reply With Quote
Old 07-27-2009, 05:45 PM   #23
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

I have 1/16" out F and 1/16" In R. 3.80 Caster.
Braineack is online now   Reply With Quote
Old 07-27-2009, 05:49 PM   #24
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,037
Total Cats: 406
Default

where's one find a skidpad around these parts? or how much is the summit point skidpad for rental?
y8s is offline   Reply With Quote
Old 07-27-2009, 05:51 PM   #25
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

$20 for the entire day when the drifters are out using it. No joke.
Braineack is online now   Reply With Quote
Old 07-27-2009, 08:04 PM   #26
Newb
 
Join Date: Feb 2008
Location: Edmonton, Alberta, Canada
Posts: 4
Total Cats: 0
Default

I was having the same trouble as you, severe understeer. Pulled my 1 1/8" RB front bar and installed 7/8"FM. (no rear bar) then I had severe oversteer. However, I noticed that the RB was pretty much seized on the bushings when I pulled it. Went back to RB 1 1/8" hollow bar, oem rear, handles awesome now.
So, try lubbing up your front sway bar.
'91, FMII GT2554R, 4.1 Torsen, AFCOs 400/275 springs Trackdog I/C, DIY water injection, 2001 Sport brakes, etc.
blownmiata91 is offline   Reply With Quote
Old 07-28-2009, 10:24 AM   #27
Elite Member
iTrader: (3)
 
Join Date: Dec 2004
Location: Houston
Posts: 2,904
Total Cats: 4
Default

need full alignment numbers
Pitlab77 is offline   Reply With Quote
Old 07-28-2009, 10:38 AM   #28
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

My alignment is currently:

Front:
Camber: -1.8L -1.9R
Caster: 3.8
Toe: 1/16" out

Rear:
Camber: -1.9L -2.0R
Toe: 1/16 in


I have a set of coilovers coming my way, looking at Shaikh's spreadsheet just swapping them in will result me in his recommended "stiff" setup for his FM2 car.
Braineack is online now   Reply With Quote
Old 07-29-2009, 01:51 AM   #29
Senior Member
iTrader: (14)
 
Join Date: Jan 2007
Location: Murfreesboro,TN
Posts: 1,273
Total Cats: 52
Default

Honestly, looking at the comparison with the NC run, its looks to me that you are braking too late and causing the understeer. I can't tell where you are in relation to the cones, but the NC driver is on the brake earlier, rotating, and back on the gas at the apex. Slow in, fast out and shortest distance will always win.

In the 1st and 3rd hair pins you are almost all the way to the back of the feature before you can get the car turned (and you seems to be still braking). Try braking a little earlier and get the car rotated a slower speed.

As for no rear bar, from what I've experienced with an open diff and from what I've been told by people experienced with a Torsen, its the way to bandaid the situation slightly. Most people have told me to skid a Torsen and go to a "real" diff. I also run more camber in the rear than the front to compensate for the extra roll in the rear (2.0f/2.5R). Worked out well, but I was fighting blown shocks most of the time.
Midtenn is offline   Reply With Quote
Old 07-29-2009, 10:15 AM   #30
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

I ended up taking that line to make the late apex, if I turned slower/earlier it was worse and slower overall. And I was plenty slow before I took them, you can see in 2nd gear I was under 2000RPM, major slowness. The first corner I might have come a little hot in, but the rest I wasn't. Just look at that sweeper, its a fairly easy corner. It's 180 but its not tight. I couldn't give the car gas through the corner else it would head straight for the pointer cones. Same thing with the last one, I took out the cone you see at 0:38 once or twice that day. And I did try a few different approaches each run.

I've been autoxcrossing this car for close to 10 years now, I used to be pretty fast with -2F and -2.5R...when I had 90rwhp.

The real problem is it's hard to find solid advice from people who autox/race high powered miata.
Braineack is online now   Reply With Quote
Old 07-30-2009, 02:12 AM   #31
Elite Member
iTrader: (24)
 
Join Date: Jun 2007
Location: Sherman Oaks, CA
Posts: 4,480
Total Cats: 3
Default

new setup: 550/300 + that rear bar you were talking about
UrbanSoot is offline   Reply With Quote
Old 07-30-2009, 05:43 PM   #32
Newb
 
Join Date: Feb 2008
Location: Edmonton, Alberta, Canada
Posts: 4
Total Cats: 0
Default

I still think you should take 5 minutes and disconnect your front end links, and make sure your sway bar moves freely. I was suprised to find mine was seized up, couldn't budge it. too stiff front=understeer.
blownmiata91 is offline   Reply With Quote
Old 07-30-2009, 05:58 PM   #33
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

I just moved it to the stiffer setting last week. while it was a bitch to do, it was not binding. Before going stiff, it had too much oversteer and felt shitty altogether. I liked how it handled but for those corners. I just need to be a real man and run new springs with better rates. FM springs are great for a GT car with leather seats and cup holders.
Braineack is online now   Reply With Quote
Old 07-30-2009, 06:32 PM   #34
Newb
 
Join Date: Feb 2008
Location: Edmonton, Alberta, Canada
Posts: 4
Total Cats: 0
Default

Cool. I found that I oversteered like crazy with the FM bar set on stiff. I don't like the angle of the end links on stiff. Had to back off the throttle on fast sweepers or it would over rotate. Times went down almost 2 sec when I switched back to my 1 1/8" hollow bar because I could keep on the throttle. My friend "Deerhunter" with his 435 rwhp stroker had same problem using the FM bar, temp. cure was to turn down the boost. We were both running AFCOs with 450/300 springs. (recently changed my springs to 400/275)
blownmiata91 is offline   Reply With Quote
Old 07-30-2009, 07:35 PM   #35
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

They posted the results from that autox finally. I'm in the top third this time, not the bottom third :P Still a good number of miatas faster than me, but a few were on r-comps.
Braineack is online now   Reply With Quote
Old 08-04-2009, 10:13 AM   #36
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,813
Total Cats: 1,780
Default

woot:

Braineack is online now   Reply With Quote
Old 08-04-2009, 11:54 AM   #37
Junior Member
iTrader: (1)
 
Join Date: Apr 2008
Location: Atlanta, GA
Posts: 293
Total Cats: -3
Default

How much did they set you back?

By no means have I managed to figure out this autocross thing since getting more power but one thing I learned is that you should try and always keep your hands on the wheel. You feed it through a lot and adds time, we've got quite a good steering ratio so if you're moving your hands a lot it may mean your turning too late and having to over compensate.

It was at a test n tune day where I had someone sit next to me that they pointed out the same thing with me. I smoothed my inputs and while it was a bit slower at first, I managed to cut down my overall times and didn't have to do as much steering.

Life was certainly easier when I had stock power!
jdmaddox88 is offline   Reply With Quote
Old 08-04-2009, 04:13 PM   #38
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,353
Total Cats: 1,319
Default

Scott, if you rotate too much with the new rates, get a tubular front bar and keep your rear bar installed. Rotating the car at low speeds without a rear bar is near impossible, especially on street tires.
Savington is offline   Reply With Quote
Old 08-05-2009, 02:49 AM   #39
Junior Member
iTrader: (10)
 
Join Date: Jan 2008
Location: SF Bay Area
Posts: 291
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
woot:

Looks like ebay sleeves + QA1's.

What's the logic behind the 550/300 setup? Especially with no rear bar you're going to have trouble getting the car to turn. I'm on 450/300 with OEM rear bar and I still have too much understeer. Might be okay for the track, but I'd try to loosen the car up for auto-x.
bryanlow is offline   Reply With Quote
Old 08-05-2009, 04:38 AM   #40
Elite Member
iTrader: (24)
 
Join Date: Jun 2007
Location: Sherman Oaks, CA
Posts: 4,480
Total Cats: 3
Default

he has aftermarket rear sway bar that will go along with these
UrbanSoot is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Hey everyone another n00b here Big_gumby Meet and Greet 80 10-05-2015 05:06 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:31 AM.