Last post on Aug 13, 2009 at 7:19 AM
You are in the Speed Shop Tuning and Modification
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Acura Integra, Performance Mods, Engine
#1715 of 1734 the new and improved Miata
Apr 15, 2007 (8:48 pm)
Hehe, well, not really I went from 375 lb/in springs in front to a heftier 450lb/in spring. It was fairly easy to do. My friend and I did the entire swap in 15 minutes
After unbolting the hat from the shock and the hat from the chassis, he used a persuasion bar to pull the suspension down. I pulled the hat and the misc. mounting hardware off of the shock, then the spring can come off. I was able to pull them out through the hole in the fenderwell where the hat mounts to.
Initial impressions: the car rides smoother now! It's also much more composed in the turns as well as over undulating surfaces. With the new springs in there, the car doesn't exhibit the crazy oversteer it did before. I can still coax it around, but it's much more controlled now.
#1717 of 1734 Re: deryckfm [paisan]
Aug 14, 2007 (12:02 pm)
funny! but unfortunately true.
#1718 of 1734 Re: the new and improved Miata [garados]
Aug 31, 2007 (7:36 am)
I 'm back again! Sorry it takes me so long to post anything. Too busy.. Glad to see the original & oldest (my oldest creation, hehe) Integra GSR discussion on Edmunds is still here.
Garados, we had discussed Miata spring rates a while ago. I 'm glad you went with the 450lb/in. in the front. That's what several fast auto-x Miatas use around here, but I would have to say that the excessive oversteer you encountered also involves the rear spring rates as well, not just the front springs. You have to find the right spring rate balance front & rear. Sounds like you got it down now. I think the fastest CSP Miata we have here uses 450F/350R and guess what shocks he is using? The Ground Control Advanced Design double adj. race shocks like the ones I had on my GSR. They are awesome but unfortunately don't last long. His broke after 2 seasons (last year), mine after about 1 1/2 seasons. I need to send them out to GC and have them rebuilt. Don't know why I haven't done it yet. I know have Off-the-shelf (OTS) Konis with only 400F/450R springs. I also went up from 6 and 7" springs to 8". The car rides beautifully, very comfortable as compared to the 600/750 rates I had before with shorter springs & custom valved Konis. I have the SP3 Konis which is the same as Yellows but 20mm shorter in the front. That way I can lower the car a bit more and not have to worry about damaging the internals if I ride the bumpstops (which I 'm not but I 'm almost there). My car is only lowered 1" now as I 'm getting ready to sell it. I want it normalize a little and make it more streetable. It still handles very well. 3-wheels like crazy now but it's still quick in auto-x.
Aug 31, 2007 (7:39 am)
Are they limiting the # of characters now? My post got cut in half..
Well here 's the other half with a pic of my car racing.
The car is only about 1/3 - 1/2sec slower on a ~45sec course than before with the custom valved Konis and stiffer springs, but I enjoy driving the car on the street a lot more. No more bracing for a little crack or bump on the road that would send shock waves up my spine. Oh I also got rid of all the LCA polyurethane bushings and put fresh OEM rubber bushings back on. It was about $250 in labor (not too bad actually - they charged me exactly the time it took them to replace them) but well worth it. The guy was honest and worked fast.
The UCA's and upper shock bushings are still polyurethane. I don't think I'll touch those. I have the lighter GC upper shock mount kit on both front & rear that came with Poly bushings that provide more shock travel. I think I'll leave those in there. The upper control arms are Ingalls that came with poly bushings and I think they 're still fine. The LCA rubber bushings made a big difference. The old Energy Suspension bushings were shot as I suspected. I know it now by the way the car behaves and rides. The LCAs had a lot of movement before which is typical of poly bushings after 3yrs and having gone through 3 winters with no lubrication. They get too hard after a while and start rotating instead of stretching, adversely affecting the handling.
So have you been auto-xing the Miata? How are you doing with that? Check out this pic from 2 weeks ago. Look how close I got to the pylon
#1721 of 1734 some more pics from Aug. auto-x
Aug 31, 2007 (7:53 am)
Wow my wheels are so full of brake dust! Dang Hawk HP+ pads!
Check out this pic. It's right before the one above (I sent them in wrong order). I 'm doing about 35+mph here (otherwise I can't 3-wheel if I go slower) lining up the car to go through the gate, the 2 blue cones. Notice how I 'm coming in and how in the pic above I manage to rotate the car and and point it almost straight through the gate. That's from 8.5yrs of auto-xing and really knowing your car well. I 'm also on the new Hoosier A6 225-45-15's all around with no rubbing! (rear fender lips are rolled). This is another reason I had to raise the car a little. I really wanted this new tire (and size) from Hoosier. Nice and fat and very sticky. Like them better than the Kumho 710 in 205-50-15. Notice the inside rear wheel.. I haven't seen that much body roll in my car since '02 when I had similar spring/shock setup. I had no idea I kept 3-wheeling until the pics were posted on the professional photographer's web site. There are 3 more the guy took within 2secs of each other (it was a big "S") and I 'm 3-wheeling in all 3. I may post them later. Don't want to take up too much space on the Edmunds server
Aug 31, 2007 (8:00 am)
This is from the summer of '02 at Englishtown raceway, NJ. See any similarities?
#1723 of 1734 Come Post over in Motorsports!
Aug 31, 2007 (8:25 am)
I see you are from the NY/NJ area, I've probably auto-xed with yah at some point!
#1724 of 1734 Re: Come Post over in Motorsports! [paisan]
Aug 31, 2007 (8:49 am)
I auto-x with about 8 different Motorsports clubs including SCCA, PCA, BMWCCA and private ones in the NY/NJ/CT tri-state area. What's your name?