Swapping springs out from coilovers

[Altim8M37]

Seen all of the discussion on Swift springs and I'm wanting more of the original suspension feel before I installed Tanabe's Sustec Pro kit. For those of you in the know, would Swift's 4N908 fit/replace the Tanabe springs that came with the coilovers and would the difference be noticeable?

[putim37s]

What version of Tanabe Sustec Pro's do you have? I know that my Comfort R's all have helper springs. My first instinct is that it would not ride well, nor be compatible. I'd be interested to know if it does work, keep us posted.

[Altim8M37]

I have the CR's.

[SwissCheeseHead]

I have had the Tanabe sustec pro kit on my G37 when I had it and I wouldn't go through the hassle (or the cost) of getting the springs swapped out. I thought it was very comfortable for DD, while still stiffening up around curves and sharp corners very well.

[Debonair]

As long as you order the correct Internal Diameter, Length, and Spring Rate the Swift Springs should fit fine and work great.

They make a HUGE variety of specs to fit lots of coilover kits. You need to figure out what the springs your current Sustec Kit uses and then cross reference those specs to Swift's Coilover Springs.

What is the part number of your Sustec kit?

[Altim8M37]

TSR158

As far as swapping them out, my shop has to fix both F/R camber so timing is ideal. Going to add some spacers to the stock 18's too.

I purchased the car to give my wife a comfortable ride and wheel gap is ub duh debil. So I'm trying to get the best of both worlds.

[putim37s]

I have the CR's.

That being said. I've had the CR's for about a year, and about 10k miles. I can tell you that it rides just like a stock Sport suspension. If you keeping your stock 18's with thicker sidewalls, I'm sure it will have the softer ride you are looking for.

[Debonair]

You may want to call Tanabe and ask them for the Internal Diameter and Length of the front and rear springs. You already know the spring rates (10.0 kg Front / 4.0 kg Rear) since they publish that. The other way to figure it our is to take the springs off and measure them.

You should be able to keep the helper springs in there without issue even though it seems to me (and most of the other coilover manufacturers) that they are not needed on daily driver cars.

Swift offers helpers and has this to say: "Helper springs allow the spring to stay on mounted on the coilover perch when the shock is under negative or zero load, also known as droop travel. It is ideal to run helper springs on setups where you cannot preload the main spring due to height issues or when experiencing springs coming loose from the coilover perch."

Negative load as when the car is jacked up or the wheels come off the ground in a hard corner. How much of a hurry is your wife in when she drives?

[Altim8M37]

She's on a constant morphine pump so she doesn't drive these days. On a brighter note, she's coming home tomorrow after going into the hospital Christmas morning.

[Altered]

Wow man, I hope things improve substantially for her

[Debonair]

Lookey what I have for you Altim8M37. I'm not sure if you are still looking to swap in some swift springs but here are the specs on your Tanabe springs.

TSR158

Front:

• Diameter: 65mm
  Rate: 10K
  Height: 210mm (8.25 in)

Rear:

• Diameter: 65mm
  Rate: 4K
  Height: 230mm tall (9.00 in)

Here is a link to the Swift 65mm Srings webpage.