INFO: The Ultimate SRT-4 Coilover Thread - Dodge SRT Forum
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post #1 of 46 (permalink) Old 05-15-2007, 01:40 AM Thread Starter
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INFO: The Ultimate SRT-4 Coilover Thread

Company / Model Spring Rate Additional Info

KW Variant 1 F340 / R170 Non-adjustable damper
KW Variant 2 F340 / R170 Single adjustable damper
KW Variant 3 F340 / R170 Double adjustable damper
KW Clubsport F685 / R400 Double adjustable damper

ST F340 / R170 Progressive spring. Non-adjustable damper

Mopar Stage 2 F257 / R171 Non-adjustable damper
Mopar Stage 3 F257 / R171 Single adjustable damper
Mopar Stage 3R Custom* Double adjustable damper

Tein Basic F280 / R280 Non-adjustable damper
Tein Super Street F280 / R280 Single adjustable damper

IPP F336 / R224 Revised spring rates, Non-adjustable & single adjustable damper
IPP F450 / R325 Original spring rates, Non-adjustable & single adjustable damper

BC Racing (Bor-Chuann) F448 / R224* Single adjustable damper
BC Racing (revised) F336 / R224* Single adjustable damper
BC ER F448 / R336 Double adjustable damper

Megan F448 / R336 Single adjustable damper

K-Sport F392 / R280 Single adjustable damper

H&R F230 / R230 Non-adjustable damper

B&G PS2 F448 / R336 Non-adjustable damper
B&G RS2 F448 / R336 Single adjustable damper

Vogtland F150-250 / R200-300 Progressive spring rates, Non-adjustable damper

CX Racing F335 / R223 Single adjustable damper

Raceland F285 / R200 Non-adjustable damper

Dropzone F400 / R225 Coilover sleeves

Ground Control Custom Spring Rate Coilover sleeves

Nex Racing SS F336 / R250 Revised spring rates, single adjustable damper
Nex Racing SS F450 / R350 Original spring rated, single adjustable damper

Eibach Pro Street F342 / R171 Non-adjustable damper

Hotbits Street Race F280 / R168* Custom applications also available
Hotbits Street Sport F280 / R168

Leda (discontinued Custom Multi-level damper adjustment

Moton Custom Multi-level damper adjustment

Penske Custom Multi-level damper adjustment

Truechoice (Koni) Custom Multi-level damper adjustment

*Custom spring rates also available.


This thread is to provide a basic overview of the available coilovers for the srt-4. If you have any information regarding new coilovers for our car please feel free to PM me with the information so I can update the list. If you have any relevant educational information feel free to PM me as well. I will continue to update this list when necessary. Thank you for all your help.

Greg


Last edited by njshift; 10-08-2014 at 12:50 PM.
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post #2 of 46 (permalink) Old 05-15-2007, 07:35 AM
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holy hell, nice list. I don't want to know how bad some of those must ride with those spring rates.










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post #3 of 46 (permalink) Old 05-16-2007, 01:39 AM
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Originally Posted by stowaway
holy hell, nice list. I don't want to know how bad some of those must ride with those spring rates.
No, you dont. PA roads suck, I have come to the conclusion you can't have a STOCK cadi in this state and have a good ride.

My megans are rough, but 1000 times better then my goldlines ever were

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you managed to get 8 DSMs together in one place??? did you own a junkyard???
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post #4 of 46 (permalink) Old 05-16-2007, 01:53 AM
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For the suspension newbies...what's a "stiffer" spring rate versus a "more forgiving" spring rate. Or is that even how you can compare them?
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post #5 of 46 (permalink) Old 05-16-2007, 07:18 AM
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spring rates are measured in weight required to compress the spring x amount. in the US it is almost always lbs per inch. So for the Tein's they require 280lbs of weight to compress the spring 1". The stiffer the spring rate, the more force is required to compress it. This means that in a car driving down the road and hitting a bump, a softer spring will be able to compress more and soak up the impact much better than a stiff spring which may only compress an inch or so. Since the spring can't soak up the impact it is transferred to the chassis and now you feel the bump. Shock valving also plays a roll in all of this, but getting into the forces per distance per timeframe is more than most want to get into.










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post #6 of 46 (permalink) Old 05-16-2007, 11:15 AM
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Great post.....it is now stuck

11.34 @ 128.33 mph. 57 trim, Stock motor, head, cams and ecu
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post #7 of 46 (permalink) Old 06-04-2007, 07:29 AM
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Hows about another column for the MSRP of each of these, I think that would make for a nicer comparison if people are going to use this thread to pick which coilovers to buy.

03' SSM Acura RSX Type-S
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post #8 of 46 (permalink) Old 06-04-2007, 07:55 AM
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As far as spring rates go, I switched from non-adjustable IPP's w/ old spring rates to the K-sports. The difference was night and day. I'm not sure whether or this is due to the dampening, the pillow ball mounts, or could this be the spring rates. it is still stiff, but seems smoother

......
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post #9 of 46 (permalink) Old 06-04-2007, 08:04 AM
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the mount won't do anything to the ride. the spring rate likely has the biggest affect.










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post #10 of 46 (permalink) Old 06-04-2007, 09:48 AM
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Thats what I was thinking, good info by the way

Thanks

......
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post #11 of 46 (permalink) Old 06-04-2007, 02:23 PM Thread Starter
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Quote:
Originally Posted by dF 240eS X
Hows about another column for the MSRP of each of these, I think that would make for a nicer comparison if people are going to use this thread to pick which coilovers to buy.
I was originally going to post prices of the coilovers listed. However I opted not do so mainly because MSRP is not a good reflection of what a consumer would pay. There is a considerable amount of price fluctuation recently and honestly it?s serious work to keep up to date with the most current price. I would rather an interested buyer do a quick search to get the most current price available rather then getting a skewed idea of price from this thread. I'm more concerned on posting hard facts rather then estimates. Between group buys, ebay, and the for sale section, price is not always invariable.

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post #12 of 46 (permalink) Old 06-04-2007, 02:28 PM Thread Starter
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Quote:
Originally Posted by bpsrt4
As far as spring rates go, I switched from non-adjustable IPP's w/ old spring rates to the K-sports. The difference was night and day. I'm not sure whether or this is due to the dampening, the pillow ball mounts, or could this be the spring rates. it is still stiff, but seems smoother
Pillow ball mounts / camber plates will actually transmit more road vibration.

Let's try to keep the comments to a minimum. Thanks.

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post #13 of 46 (permalink) Old 06-17-2007, 11:09 PM
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any ideas on when IPP changed their spring rates? i have their stage 2 coilovers and am looking into changing the springs on them.
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post #14 of 46 (permalink) Old 06-30-2007, 02:12 PM
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Quote:
Originally Posted by DaFlyyOnDaWall
any ideas on when IPP changed their spring rates? i have their stage 2 coilovers and am looking into changing the springs on them.
Good idea... The stocker are to soft anyway especialy on the back! Put the 258lbs stocker front on the back and buy a pairs of 345lbs for the front... This is a nice set-up for the track and daily friendly on the street at low cost!

Have a good my friend...

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post #15 of 46 (permalink) Old 06-30-2007, 03:10 PM
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are you saying i should swap springs on the stock struts?
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