Mazdaspeed Sport Spring Consensus?
Bigboy in a little car!
Joined: Nov 2004
Posts: 1,276
Likes: 7
From: In So Cal.. out in BFE... but in the good part... but not really by Cesar, Keith or Loren...
your "easy" way, seems a lot harder then putting it in a spring tester and testing it. 
also does not factor in quality of the steel.
none the less, its very coo to have that formula. I am sure it gives a close ball park figure. good find!
also does not factor in quality of the steel. none the less, its very coo to have that formula. I am sure it gives a close ball park figure.
good find!
is adjusting valve lash
Joined: Sep 2007
Posts: 1,060
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From: hollywooood!
^^demon, i was like eeeeccckkk when i saw that it wants u to factor in the grade of steel strength. and according to RB in its catalog, it uses special "selected" steeel alloys. so if thats only for lighter springs... its like 4.6 lbs in front and 4lbs rear. but what about the strength of the alloys? so yea, that can have a direct factor in finding accurate #'s for that given formula.
like i said... this is just a "handy" book. its really a bible to learn the bases of such and gives quick references formula's. but we all learn that in the REAL world, not all are created equal.
like i said... this is just a "handy" book. its really a bible to learn the bases of such and gives quick references formula's. but we all learn that in the REAL world, not all are created equal.
is adjusting valve lash
Joined: Sep 2007
Posts: 1,060
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From: hollywooood!
demon, i PM'd u. let me know whats the haps man. i will get back on this thread when i'm back from work. but either way... if u want to help, it'll be cool. i figured someone should be doing the job of policing the aftermarket companies. and if they are lying...RB's goin down! i'm goin back to mazdatrix and returnin my ****!
One ball, corner pocket
Joined: Apr 2004
Posts: 2,053
Likes: 1
From: Fontucky, right next to Patriotville
trochoid....the rb springs in front are unusual to say the least. At least in my experience, in the two RB spring installs I've done, the spring is very narrow at the bottom (where it sits in the perch)....and in both cases, the spring (even when installed) did not touch the seat properly.
Upon installing the strut/spring onto the car, it actually raised the vehicle. Following some additional installation instructions....the car did lower to the advertised drop.
The additional instructions have you loosen two of the bolts and allow the vehicle to "settle"...then tighten the bolts.
As far as spring rate on the RB spring....I'm sure if you paid for shipping, Speed would test the spring for you and send it back.
Upon installing the strut/spring onto the car, it actually raised the vehicle. Following some additional installation instructions....the car did lower to the advertised drop.
The additional instructions have you loosen two of the bolts and allow the vehicle to "settle"...then tighten the bolts.
As far as spring rate on the RB spring....I'm sure if you paid for shipping, Speed would test the spring for you and send it back.
Thread Starter
road warrior
Joined: Feb 2006
Posts: 1,861
Likes: 3
From: Oakland and Los Angeles, CA
W(4th pwr) G
_____________
K =
8ND(3rd pwr)
K=stiffness of spring in lbs. per inch
W=diameter of the spring wire (in inches)
G= 12,000,000 for steel springs
N=number of active coils (# of free coils+1/2)
D=diameter of the coils (measured to the centers of wire, in inches)
note: an easy way to find coil diameter D is to measure the O.D. of the coil minus wire diameter.
this info is gathered from "how to make ur car handle" by fred puhn.
this book seems very informative and very knowledgeable, however, i use it for an "easy" way to find things. it is not a mechanics training textbook, so the info may or may not be very accurate to modern standards if its off. there are specific formulas i've learned in suspension dynamics and etc. but the textbook formula hardly stays with me as its only practiced occasionally to see if the students can comprehend the formula and its function and to prepare for ASE testings and such.
i'm only stating the above info to inform everyone "no way in hell am i goin back to my parents house to dig up a textbook and research long chapters for one specific application". this should be reasonable enough to start as a foundation formula to test on.
_____________
K =
8ND(3rd pwr)
K=stiffness of spring in lbs. per inch
W=diameter of the spring wire (in inches)
G= 12,000,000 for steel springs
N=number of active coils (# of free coils+1/2)
D=diameter of the coils (measured to the centers of wire, in inches)
note: an easy way to find coil diameter D is to measure the O.D. of the coil minus wire diameter.
this info is gathered from "how to make ur car handle" by fred puhn.
this book seems very informative and very knowledgeable, however, i use it for an "easy" way to find things. it is not a mechanics training textbook, so the info may or may not be very accurate to modern standards if its off. there are specific formulas i've learned in suspension dynamics and etc. but the textbook formula hardly stays with me as its only practiced occasionally to see if the students can comprehend the formula and its function and to prepare for ASE testings and such.
i'm only stating the above info to inform everyone "no way in hell am i goin back to my parents house to dig up a textbook and research long chapters for one specific application". this should be reasonable enough to start as a foundation formula to test on.
is adjusting valve lash
Joined: Sep 2007
Posts: 1,060
Likes: 0
From: hollywooood!
^^haha, poor guy. i remembered at first when i kept getting e-mails of the subscribed threads...annoying.
KWESCOTT: yes, the RB springs are actually funny like that. and thats why i'm curious to find out. and my fronts fitted perfectly and had to be compressed to fit... are you sure you put the right ones on? the 14026 are for the front, 14027 are for the rears.
and yes...at first i did get upset and remove and recheck to make sure there wasn't something wrong with the strut top during install. but i just preloaded the car when i re-installed, loosen the a-arm and jack up the suspension when tightening...also had the car's rear end sit up on ramps.
needless to say, the car FINALLY seem to start settling in after a long 2 weeks...barely getting 2 3/4 finger gap....wow.....
KWESCOTT: yes, the RB springs are actually funny like that. and thats why i'm curious to find out. and my fronts fitted perfectly and had to be compressed to fit... are you sure you put the right ones on? the 14026 are for the front, 14027 are for the rears.
and yes...at first i did get upset and remove and recheck to make sure there wasn't something wrong with the strut top during install. but i just preloaded the car when i re-installed, loosen the a-arm and jack up the suspension when tightening...also had the car's rear end sit up on ramps.
needless to say, the car FINALLY seem to start settling in after a long 2 weeks...barely getting 2 3/4 finger gap....wow.....
is adjusting valve lash
Joined: Sep 2007
Posts: 1,060
Likes: 0
From: hollywooood!
oh kwes, i live here in so-cal. so its just a matter of convenience to meet up with demon.
and could it be that these springs have been revised? dunno... but when was ur mod done? in 04? maybe there are 2 version??? again, mine sits in the perch just peachie and a lil too stiff. ride seem actually softer...dunno why, but it does. the rears are still stock, and my friend also verified that the rears catch stiffer than the front... weird.
and could it be that these springs have been revised? dunno... but when was ur mod done? in 04? maybe there are 2 version??? again, mine sits in the perch just peachie and a lil too stiff. ride seem actually softer...dunno why, but it does. the rears are still stock, and my friend also verified that the rears catch stiffer than the front... weird.
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Joined: Sep 2006
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From: Madison, WI
One ball, corner pocket
Joined: Apr 2004
Posts: 2,053
Likes: 1
From: Fontucky, right next to Patriotville
oh kwes, i live here in so-cal. so its just a matter of convenience to meet up with demon.
and could it be that these springs have been revised? dunno... but when was ur mod done? in 04? maybe there are 2 version??? again, mine sits in the perch just peachie and a lil too stiff. ride seem actually softer...dunno why, but it does. the rears are still stock, and my friend also verified that the rears catch stiffer than the front... weird.
and could it be that these springs have been revised? dunno... but when was ur mod done? in 04? maybe there are 2 version??? again, mine sits in the perch just peachie and a lil too stiff. ride seem actually softer...dunno why, but it does. the rears are still stock, and my friend also verified that the rears catch stiffer than the front... weird.
check your pm's.
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