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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Sonic Tuning S1 Coilovers review



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      01-10-2011, 09:51 PM   #45
shaizada
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Quote:
Originally Posted by Fraggy View Post
Hey, do me a favor if you can. Can you play with the shocks and make sure that they click nicely at each number? One of the things I hated with the PSS9s was that they did not each have 8 distinct clicks. Some had 6, some had clicks inconsistently. Id go to adjust and turn the dial and sometimes NO clicks at all. Id do it over and over and over to get it.

The biggest frustration was that sometimes the damping was not equal from side to side and sometimes you didnt really know, it was a bit disconcerting. Also, sometimes the clicks were in different parts of the range, just not consistent at all.
Just checked. The dampener setting knob clicks perfectly and distinctly. The clicks are spaced out evenly through all the click range. You had me a little worried there so I checked as soon as I read your post! LoL
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      01-10-2011, 11:37 PM   #46
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Quote:
Originally Posted by shaizada View Post
Just checked. The dampener setting knob clicks perfectly and distinctly. The clicks are spaced out evenly through all the click range. You had me a little worried there so I checked as soon as I read your post! LoL
Cool man, these are sounding better and better. I really like the idea of the knob being at the top of the front stuts. I wonder if they will be adjustable with the brace in place or if it will need to be removed each time like with Koni Yellows. Either way, its way better than on the bottom like the PSS9-10s.
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      01-13-2011, 04:06 AM   #47
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Looks like I'm going in for an install tomorrow. I need to remember to take before and after pics.
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      01-13-2011, 02:40 PM   #48
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looking forward to reading all about it!
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      01-13-2011, 03:36 PM   #49
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Quote:
Originally Posted by shaizada View Post
Looks like I'm going in for an install tomorrow. I need to remember to take before and after pics.
I cant wait
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      01-13-2011, 04:28 PM   #50
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Quote:
Originally Posted by BillLee View Post
finally got my 10mm spacers installed. Dampening settings are 5 front and 6 rear.

now i need to get my fenders rolled, raise the rears just a tiny bit, and buy another pair of spacers for the rear.



good god....i wish i could slam my car like that here in the east coast!!!! i had to raise mine up cuz i installed the coilovers right before the blizzard in DC we had last year (which i did drive in and the car handled well to my snow drifting lol) that heights looks great!!!

-love the feedback btw, def helps us answer questions for u and for others!
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      01-13-2011, 05:02 PM   #51
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Quote:
Originally Posted by shaizada View Post
Looks like I'm going in for an install tomorrow. I need to remember to take before and after pics.
keep me posted and let me know if u need anything or have any questions!!
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      01-13-2011, 06:11 PM   #52
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Installed!! Good god that was a fun ride back. Stopped at in n out for lunch. Will start a new thread with some remarks, pics and initial thoughts

I am so happy!!!! Posting from my iPhone, so more later when I get back on my computer.
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      01-13-2011, 11:14 PM   #53
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Gaurav, sounds great.. give us the details.. how much did you drop from where you were (sport suspension).. what settings are you at.. how is the handling, ride quality (from big bumps to the small expansion spaces in the road)..

eagerly waiting,

Sachin
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      01-14-2011, 08:43 PM   #54
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Sorry guys, didn't get a chance to sit down and write up impressions yet.

Here is a quick iPhone pic to tide you over. Second, I'm falling in love with the car all over again.

Edit: darn can't upload pic from iPhone! Crappy browser!

Last edited by shaizada; 01-14-2011 at 11:47 PM.
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      01-14-2011, 10:26 PM   #55
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Quote:
Originally Posted by shaizada View Post
Sorry guys, didn't get a chance to sit down and write up impressions yet.
Absolutely NOT acceptable!!!! LOL

BTW, is this your car????
Name:  car.jpg
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Last edited by Fraggy; 01-14-2011 at 10:36 PM.
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      01-14-2011, 10:42 PM   #56
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That's the one!! Right after the install, pulled up infront of the shop.
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      01-15-2011, 01:07 AM   #57
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So, what about the ride my friend? You seem impressed, the car looks great, a little low for my tastes, but nonetheless...
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      01-15-2011, 01:10 AM   #58
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Quote:
Originally Posted by shaizada View Post
That's the one!! Right after the install, pulled up infront of the shop.
When I quoted your other message the link to the pic was there. Maybe E90post and imageshack dont get alone.
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      01-15-2011, 03:20 AM   #59
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As promised, review posted here:

http://www.e90post.com/forums/showth...16#post8693216

I didn't proof read for grammatical errors, but will correct later if I feel like it. It's late and I gotta get up early for a roof vinyl wrap and hopefully get to MFEST!!
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      01-20-2011, 12:00 AM   #60
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How much were the coil-overs? And installation?
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      01-20-2011, 05:48 PM   #61
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Quote:
Originally Posted by jose_sonictuning View Post
450lbs=8KG 500lbs=9KG

Google does everything for you
With those spring rates it sounds like they would/could be stiff. How do these spring rates compare to a stock e90 non performance suspension? I assume it's stiffer but by how much?


Also, are can these coilovers be rebuilt?
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      01-21-2011, 05:00 PM   #62
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Quote:
Originally Posted by jose_sonictuning View Post
450lbs=8KG 500lbs=9KG

Google does everything for you
If I'm reading that right, and cross referencing the spring rate sticky thread posted by Mr. 5, it appears that the typical "balanced" spring rates for front and rear would be closer to 1 : 2 or even as high as 1 : 2.5 ratio for the way the E9X's suspension is designed. If I'm not mistaken, the reason being is the spring attachment point has moved WAY in in the rear suspension thus resulting in requiring much higher rear spring rate to retain equivalent wheel rate.

These spring rates, at 450lbs front and 500lbs rear would result in a car that is way over-sprung up front compared to a very under-sprung rear. These rates would be closer for a coil spring on shock absorber conversion in the rear, and even at that the rates still look off? If it's coil on shock in the rear the ideal spring rate should be nearly equal front to rear.
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      01-21-2011, 06:06 PM   #63
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Quote:
Originally Posted by The HACK View Post
If I'm reading that right, and cross referencing the spring rate sticky thread posted by Mr. 5, it appears that the typical "balanced" spring rates for front and rear would be closer to 1 : 2 or even as high as 1 : 2.5 ratio for the way the E9X's suspension is designed. If I'm not mistaken, the reason being is the spring attachment point has moved WAY in in the rear suspension thus resulting in requiring much higher rear spring rate to retain equivalent wheel rate.

These spring rates, at 450lbs front and 500lbs rear would result in a car that is way over-sprung up front compared to a very under-sprung rear. These rates would be closer for a coil spring on shock absorber conversion in the rear, and even at that the rates still look off? If it's coil on shock in the rear the ideal spring rate should be nearly equal front to rear.

i think the link that you are referring to is this one...

http://www.e90post.com/forums/showthread.php?t=235797

basically...our set up is very similar to the KW Clubsport and HKS Hypermax almost identical ratios, let me know via pm if u have any more detailed questions!
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      01-21-2011, 06:36 PM   #64
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Better yet let's have the discussion out in the open where consumers like myself might be able to learn something about a product I am considering.

The spring rate ratio of the Clubsports appear to be considerably higher than the Sonic co. The only coilover that has a ratio close is the HKS. Why do the Sonic co's have a more balanced ratio and what are the advantages/disadvantages of a more balanced ratio? The HACK or anyone else feel free to chime in here?
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      01-21-2011, 07:17 PM   #65
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I dont know much about this stuff so I just kinda wanna learn a bit.

Question for Jose: Can the springs be replaced with Swift Springs? This way we get the spring rates we want and still take advantage of the adjustable damping control to dial in the ride we want.
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      01-21-2011, 07:38 PM   #66
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I don't know why Sonic, KW Clubsport, and HKS uses a different ratio than BMW and quite a majority of tuner's spring rates. Those rates look more like E36 and E46 spring rates which uses a spring attachment point a lot closer to the king-pin in the rear, so the resulting wheel rate is closer between the front and rear.

I don't want to speculate as to why it works or not, since suspension tuning is such a black voodoo magic that even the best in the business will tell you it's all about testing testing and testing to come to the right rate and damper settings. Only reason I commented was the spring rates jumped out at me.

Then again, Dinan's been known to actually put SOFTER dampers on his suspension packages to achieve BETTER handling characteristics...This is Steve Dinan, one of the most revered technical guru when it comes to BMWs. It is entirely possible to tune the rear compression ratio to mate to softer springs (relatively speaking compared to front) in the back to achieve desired effect...Depends on what the desired effect is.

Also, does anyone know if the KW Clubsport or HKS Hypermax is a coil on shock absorber design, or a coil on control arm system?
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