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Spring rates and other basic suspension info

Old 06-26-2009, 03:11 AM
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Generally speaking if i just got a set of lowering springs how quickly could i except my stock struts to go out and is this something i can do in my garage if i had a spring compressor?

Thanks
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Old 07-25-2009, 11:52 PM
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Quick question about springs, Figured i'd post here instead of creating a new thread. Whats the reason most springs have a bigger drop in the front?
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Old 07-26-2009, 06:16 AM
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The wheel well allows for more room to drop in front than in back is one reason. Visually, the car looks better with a 1/2" lower in front (IMHO).

Spoolin, it's been a while since you asked the question ... but. I'd guess your stock struts to last a while, 75k miles maybe. Of course there are tons of factors to consider like driving habits and such. And a spring compressor will help you do the job in putting on your lowering springs, but it's not a job to do alone if you're not experienced.
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Old 07-26-2009, 07:03 PM
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FL

Originally Posted by Spoolin8 View Post
Generally speaking if i just got a set of lowering springs how quickly could i except my stock struts to go out and is this something i can do in my garage if i had a spring compressor?

Thanks
I was going to ask the same thing. I plan on getting some coilovers asap but in the mean time I would like to drop it for looks (so long as it doesn't actually compromise safety rather than assist)
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Old 07-27-2009, 01:18 AM
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If you're going to get coilovers don't bother wasting your time and money on springs. It's throwing away money and doing work twice.
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Old 07-27-2009, 09:42 AM
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Originally Posted by shaunv74 View Post
If you're going to get coilovers don't bother wasting your time and money on springs. It's throwing away money and doing work twice.
You're right. And I know this. I just get so happy thinking about mods....
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Old 07-27-2009, 05:19 PM
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Hi guys, just to let you know that i've just put "Tein H-Tech: 179/129 - Drop = 1.0"/0.3" " on my RX8 SP and i am very pleased of it in terms of efficiency and comfort BUT they are meant to have the car well aligned between front and rear and the front is really to high in terms of looks.

i hope it will go down abit after few month of use because right now i don't find it very sexy.

here's the only pic i have for the moment but clearly the front is too high whether the H Tech are supposed to help having all well aligned :

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Old 07-27-2009, 06:02 PM
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You need to get the car aligned when you swap springs as it changes the suspension geometry.

Also it may be too high if you tighten your suspension bolts with the car still off the ground. The car should be on the ground before you tighten your control arm bolts.

Third they will settle a bit in a week or so.
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Old 07-27-2009, 06:17 PM
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Originally Posted by shaunv74 View Post
You need to get the car aligned when you swap springs as it changes the suspension geometry.

Also it may be too high if you tighten your suspension bolts with the car still off the ground. The car should be on the ground before you tighten your control arm bolts.

Third they will settle a bit in a week or so.
Hi Shaun, well i got the car aligned with geometry -1.05 front and -1.55 rear cause i wanted more comfort and less sporty setup as before (-1.5 F and 2.5 R).

and still the back is low and the front is really high as i can put two fingers inside between wheel and body.

i will have to ask if the car was on the ground when they tighten control arm bolts (need to understand what it is in french also lol) , thanks for the advise !!!, if it wasn't the case, should i ask my dealer to do it or would the springs lower after few month of use anyway ?
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Old 07-27-2009, 06:20 PM
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Also measure the distance from the ground to the top of the fender well with a tape measure. Not the gap to the wheels. The rear on these cars always seems to squat lower in the back but it's an illusion.
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Old 07-27-2009, 06:26 PM
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Originally Posted by shaunv74 View Post
Also measure the distance from the ground to the top of the fender well with a tape measure. Not the gap to the wheels. The rear on these cars always seems to squat lower in the back but it's an illusion.
good idea thanks alot !
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Old 08-09-2009, 12:38 PM
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Originally Posted by DPE View Post
This is copied from another post in my forum; just trying to keep all relevant suspension info in this sticky thread....

********************

Here is a post from our very own Craig (TheArchitect), describing his thoughts on the Tein Basics after living with them for a couple months. Took this from another post and edited the content a bit for relevance:

Well, I'll add my $.02 to the mix. I haven't autocrossed with the Basics, but I have had it at the track a couple of times with Basics on and drive daily on them.

In daily driving, I traverse plenty of pothole-ridden midwestern roads, so I appreciate that the Basics aren't super firm. The stock suspension is decent, but definitely soft. The Basics do cure that. I have driven the car on some road trips and it remains plenty comfortable. That the engineers at Mazda have given the car such a good GT/sportscar blend is a testament to their chassis tuning prowess, but there were obviously compromises made. The Basics get rid of those compromises, mostly without making any compromises of their own in harshness. I'm pretty impressed by that. That said, I can see them maybe not being the perfect companion for autox since agility and responsiveness are highly valuable in that setting, and I can see that some would prefer more damping (namely, rebound in the rear, at least in my observations) even in the Basics.

The car with the OEM suspension has a tendency to get a bit of a wiggly butt on track when really pushed deep into a corner under trail braking, and it also has a bit more roll than I personally care for on track. Nothing horrendous, but it could be better. Under hard braking deep into a corner, it seems to me (keeping in mind that I'm not a suspension engineer) that the rear suspension unloads to such a great degree due to lack of rebound control in the rear and softness in the front that you can actually get a fair amount of change in alignment that creates some instability in the rear of the car at the absolute limits (think positive camber and maybe even a positive toe change). The amount of suspension softness actually is good up to about 8-9/10 in my opinion, because it aids in grip to a point and gives a little bit of margin for error before giving up grip and spinning. For most drivers, this is probably a good safety net. At about 10/10 (and especially at 11+/10!), things get considerably dicier on track. In several driving events on the stock suspension, I found that the car gets a bit spooky when really pushed to the limit. We're talking driving really deep into a turn, and frankly overdriving the car, but that was a bit of the point, to try to find the car's weaknesses.

So, on track with the OEM suspension, one can definitely overdrive the car into an oversteering state, albeit a state that is recoverable - in my experience, anyway. After getting the Basics on, I found that the positive traits of the car remained in daily driving, but it really came alive on track. In fact, the car became a lot more entertaining on track. The chassis feels more balanced and more alive. The untoward dive and roll has been tempered a lot. There is still some roll, but it's lessened. Might still want sway bars, but that's a lot about preference.

I have found the car to be supremely balanced with the Basics on track, more so than stock, and I have found that I can balance the car exactly how I want it with the throttle now, whereas throttle induced yaw corrections were less precise on the stock suspension. The car is much more planted in the rear in hard braking and trail braking, which is much appreciated at the limit, without gaining understeer. The car is a whole lot of fun stock on track, but with the Basics it really has gone to a new level when driven hard. It has shown no tendency to give up on me like it did as stock when driven really hard, remains balanced, has sharper reflexes, and yet still allows enough body motion to keep someone like me, with no F1 contract as of yet (I suspect with good reason, but I'm still open to offers...), on the road course and out of the weeds.

So, the Basics might not be perfect for everyone, but I have been very pleased with them. We'll have more to report as time goes on and other developments take place with other product pairings, but so far I can't find much to fault in the Basics for a car that is daily driven and occasionally tracked. If you do autocross also, I could see going with something adjustable being a huge benefit, since the settings for autocross vs. road course would probably need to differ a bit. But, so far so good with the Basics for me.
That sounds about right, well to me atleast. The only thing that I'm always thinking about is the ride height overall. The front of my rx8 with the tein basics appear to be a little lower than most rx8's out there. PFS installed them and I guess I have it set to 1.5 inch drop all the way around but why does the front look lower than the rear almost as if the rear was changed just a little bit but not much.
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Old 10-07-2009, 11:36 AM
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Looking into some eibach springs to lower the car (here the link http://eibach.com/cgi-bin/htmlos.exe...56575200011834)
, and also give me a stiffer ride for autox and road race. Any one use these springs? I'll be using bilstein shocks.

Would love the input, especially on how low these springs would drop the 8. I hoping to get as close to 2" as possible.

Thanks in Advance!

(trying to do this on a budget...)
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Old 10-07-2009, 02:25 PM
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^well if you read the very first post in this thread you would see that the Eibachs do not lower the car anywhere close to 2". They are 1.2" front and .8" rear. There is a set that lowers both front and rear about 2" but I believe it the sprint springs.
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Old 10-08-2009, 06:24 AM
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Originally Posted by bulletproof21 View Post
^well if you read the very first post in this thread you would see that the Eibachs do not lower the car anywhere close to 2". They are 1.2" front and .8" rear. There is a set that lowers both front and rear about 2" but I believe it the sprint springs.
Thats what it says, then ".... not confirmed."

I figured someone may have installed them, then they settled...
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Old 10-08-2009, 11:59 AM
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^ok fair enough, my apologies. I actually HAVE heard that the Eibachs drop closer to 1.2 inches both front and rear. I believe it was "swoope" that said this. We will see if he chimes in.
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Old 10-08-2009, 03:14 PM
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Originally Posted by DPE View Post
At the moment, there are only a few options for shocks, though there are tons of options for springs. The spring choices are listed above, and there are other brands available that we haven't had time to look at. For shocks, though, the list goes like this:

Koni - Sport shocks, rebound adjustable (rear shocks must be removed for adjustment), seem to be compatible with just about any spring.

Tokico - DSP Kit, compression and rebound adjust simultaneously, can be adjusted on the car at all four corners, and should also work well with most springs. Probably a bit softer than the Konis as the softest settings. We have not tried them yet, but will in the Spring.

Mazdaspeed - Non-adjustable, probably best used with MS springs and swaybars to have the kit Mazda intended.

Tein Basic Coilovers - Hey, I said I didn't WANT coilovers! Perhaps not, but for a matched shock and spring kit that you can simply leave at the Tein-recommended ride-height, this kit works quite well. And the price is well within range of buying any of the above shocks with a set of springs.

Over the next couple weeks we'll post some of our impressions on a few of the suspension bits we've tried, and any other info we think might fit this post.

for some reason i dont think that the mazdaspeed springs and shocks that are offered seperately are the same as the mazdaspeed coilover set they offer....

the mazdaspeed coilover set says its adjustable so just saying..........just my .02 cents to get some discussion here and clarify some things ive been looking at.
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Old 11-30-2009, 10:23 PM
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I am very new to this Forum and i had a question? Please excuse my Noobness but I was just curious, Are the Tanabe Gf210's Any good? Thnx in advance! I just really like the drop rate and its not priced bad either!
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Old 12-01-2009, 02:02 PM
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yes, tanabe's are good, thet're well known
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Old 12-02-2009, 01:00 AM
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Originally Posted by Eight View Post
yes, tanabe's are good, thet're well known
Thanks Alot! yea i wasnt Sure because everyone has either Ebaich or Tein! But i really liked the drop! By any chance do u know if their really stiff or? Sorry just not alot out their on the Tanabe Springs. Thanks again
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Old 12-02-2009, 05:43 AM
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ya, tanabe's are i guess underrated here.
Heres a link on some of the springs out there.

https://www.rx8club.com/showthread.p...0198&highlight
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Old 12-03-2009, 12:27 PM
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Originally Posted by Eight View Post
ya, tanabe's are i guess underrated here.
Heres a link on some of the springs out there.

https://www.rx8club.com/showthread.p...0198&highlight

You are very right! The Tanabe's are very underrated! But on other Forums such as 350Z and Subaru. It is a very popular choice! Thanks i will check this out!
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Old 12-03-2009, 01:13 PM
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yea the tanabes are awesome... im running them right now and have been for a little over a year.. best spring IMO
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Old 12-03-2009, 05:25 PM
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Originally Posted by mattrotary34 View Post
yea the tanabes are awesome... im running them right now and have been for a little over a year.. best spring IMO

Thanks for the reply! i wanted something different and i really like Tanabe! But i wasnt sure because not to many Rx8's have them. Now i feel alot better with my choice!
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Old 12-03-2009, 05:35 PM
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I enjoy my Tanabe's very much. I run them with Koni's so I cannot comment on the ride with OEM shocks.

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