Optimal ride height?
11-30-2010, 07:29 PM
#26
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Join Date: Aug 2009
Posts: 186
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Anyone know what amounts of travel we need front and rear? I have yet to take off my wheels to check zipties on shock pistons after this weekend's event, but prior, my zipties pressed the bumpstops all the way up... and left 3" F and 2" R travel before shock body hits the bumpstop. Probably down to 2" front travel and 1" rear travel considering the weight of the car and my 10kg/mm (560lbs/in) and 8kg/mm (448lbs/in).
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11-30-2010, 07:41 PM
#27
Anyone know what amounts of travel we need front and rear? I have yet to take off my wheels to check zipties on shock pistons after this weekend's event, but prior, my zipties pressed the bumpstops all the way up... and left 3" F and 2" R travel before shock body hits the bumpstop. Probably down to 2" front travel and 1" rear travel considering the weight of the car and my 10kg/mm (560lbs/in) and 8kg/mm (448lbs/in).
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11-30-2010, 07:53 PM
#28
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Join Date: Aug 2009
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Do you have a link to what FCM recommends for Miata's of different heights? I will be raising mine to gain clearance for the addition of a splitter, as my lip was scraping along a turn in 3rd gear (steeply banked section of the track, "the bowl" of SOW CW) as it is.
This is what my car looks like coming out of the skidpad, I am in 2nd, i think at around 4-5k rpm?
EDIT: My bumps are 1.5" and I have 1.0" bumps (of rubber though) at my disposal...
Last edited by greeenteeee; 11-30-2010 at 08:04 PM.
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11-30-2010, 07:59 PM
#29
I am using bumpstops that came with my coil-overs... for the front specifically, since I had 115mm (4.5" ish) of available stroke and left with 3" of travel with bumpstop @ full droop, I assume they are probably 1.5" long.
Do you have a link to what FCM recommends for Miata's of different heights? I will be raising mine to gain clearance for the addition of a splitter, as my lip was scraping along a turn in 3rd gear (steeply banked section of the track, "the bowl" of SOW CW) as it is.
Do you have a link to what FCM recommends for Miata's of different heights? I will be raising mine to gain clearance for the addition of a splitter, as my lip was scraping along a turn in 3rd gear (steeply banked section of the track, "the bowl" of SOW CW) as it is.
http://forum.miata.net/vb/showthread.php?t=401320
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11-30-2010, 08:10 PM
#31
I don't think so. 949's cars are all pretty low and they measure from the "pinch weld".... I know my front pinch welds may be pretty fucked up, but in any case, I dialed in 4 1/8" FRONT and 4.375" REAR to take into account if my pinch welds had crushed upwards a bit... and my front tie rods and control arms are angled upwards (1990 non-LE tie rod ends).
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11-30-2010, 08:34 PM
#32
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Join Date: Aug 2009
Posts: 186
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-2.9 front -2.2 rear. I tried to copy 949's -2.5 but my toe ended up being 0 at -2.2 so I left it. On my best session going clockwise, my driver rear was all within 1 degree btwn the inner, mid and outer tread. The driver front had more heat on the inside, but it was only 9 degrees off from the outer tread-- I will probably leave it as the inside takes care of all the braking anyway.
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11-30-2010, 08:36 PM
#33
-2.9 front -2.2 rear. I tried to copy 949's -2.5 but my toe ended up being 0 at -2.2 so I left it. On my best session going clockwise, my driver rear was all within 1 degree btwn the inner, mid and outer tread. The driver front had more heat on the inside, but it was only 9 degrees off from the outer tread-- I will probably leave it as the inside takes care of all the braking anyway.
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12-01-2010, 01:39 PM
#36
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Join Date: Aug 2009
Posts: 186
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Heavier than 560lbs/in up front? I'm only using street tires though... with 560F 448R, I've thought of going down to a 392R before going w/ a stiffer spring up front.
EDIT: Unless you think RE-11s can handle a 12k up front, I am willing to try on my next setup, which will include raising the height a bit and adding some aero. (stock power)
EDIT: Unless you think RE-11s can handle a 12k up front, I am willing to try on my next setup, which will include raising the height a bit and adding some aero. (stock power)
Last edited by greeenteeee; 12-01-2010 at 02:49 PM.
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12-01-2010, 06:39 PM
#38
Heavier than 560lbs/in up front? I'm only using street tires though... with 560F 448R, I've thought of going down to a 392R before going w/ a stiffer spring up front.
EDIT: Unless you think RE-11s can handle a 12k up front, I am willing to try on my next setup, which will include raising the height a bit and adding some aero. (stock power)
EDIT: Unless you think RE-11s can handle a 12k up front, I am willing to try on my next setup, which will include raising the height a bit and adding some aero. (stock power)
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12-02-2010, 08:07 PM
#40
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I think it is also a matter of driver preference, and after 2 trips to Streets of Willow and 1 trip to Buttonwillow, I do not yet know what kind of spring change I want to do. I'm doing Buttonwillow again later this month so hopefully I will be able to figure out my next step. My last trip to SOW did net me a new personal best time (first time using RE-11 on the Miata) so it's hard to change the setup so soon.
Didn't know the RE-11 had a stiff enough sidewall to warrant that stiff of a spring, I thought 12k and up was solely for R compounds. I am contemplating going down to 10/7, or up to 12/8. FRC will be 61% either way, but since I might be running into travel issues, I may try going to 12 up front.
EDIT: corrected FRC to 53.3%
Last edited by greeenteeee; 12-10-2010 at 07:40 PM.
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