If this US info is correct? The Pedders newage WRX and Pedders non-widetrack sti (Pedders list as the same spring rate!?):
front 157 lb/in
rear 128 lb/in

 

Its very good suspension setup Enginetuner recommended them for me too that’s my next mod for sure

 

Great .
What are their spring rates?

 

It's very good news that someone is doing a replacement, non-inverted, strut for the STI widetrack (apart from Feal).

Do you know their spring rates?

 

Pedders STI widetrack (According to Pedders USA):
f210lb/in r225lb/in

 

Just spoke to pedders, wide track ezikit is,

209.9lb/in front
213.6lb/in rear

 

Very useful info. Thanks.

 

...

 

Stock blob/hawk STI 223/195 (217/171 at ride height)
STI pinks 257/217 minus 28mm front (223 at front ride height)
Pedders widetrack STI 210/214 minus ??mm front
Prodrive widetrack STI 234/223 minus 18mm front
WA/A2 245/223 minus 25mm front (front and rear dual-rate springs - linear in their operational range)

Stock WRX saloon 163/119
Pedders WRX 157/128

My concern would be lowering the ride height and not increasing the spring rates. As you have reduced the bump travel - the bump stops will become critical, in thier length and durometer.

 

arnt they the US figures for the stock ones?

 

The UK STI measures the same as US STI. Is that what you mean?

 

...

 

no, are the standard spring rates the same?

 

apparently the strut design can affect it as well depending on damping rates, so its not as simple as just softer and harder springs.

 

There's KYB Ultra SR struts: suitable for the non-widetrack 2004 sti saloon (non- inverted wagon ultra sr struts are available).

Inverted version for saloon (really need the internal bump stops changing):
321002 KYB Front Right Shock Absorber fit IMPREZA 321002
321003 KYB Front Left Shock Absorber fit IMPREZA 321003
324004 KYB Rear Right Shock Absorber fit IMPREZA 321004
324005 KYB Rear Left Shock Absorber fit IMPREZA 321005

Non-inverted version for saloon:
324030 KYB Rear Right Shock Absorber IMPREZA 324030
324031 KYB Rear Left Shock Absorber IMPREZA 324031
324032 KYB Front Right Shock Absorber IMPREZA 324032
324033 KYB Front Left Shock Absorber IMPREZA 324033

STI springs fit the inverted struts.
WA/A2, STI-rate, springs and matching bump stops, fit both the inverted and non-inverted struts, due to their longer free-length.

 

we have always offered deals on these regardless and would happily look at a Group Buy scenario with better pricing determined by numbers involved..........

 

...

 

If you're concerned about potential knocking, you could use non-inverted:
KYB AGX * 734034, 734035, 734036, 734037
KYB Ultra SR
Feal FPS http://fealsuspensionstore.com/produ...-perch-struts/ Contact sales@wisefab.com they're in Estonia. They are (were) the European distributor of Feal USA
Koni Inserts
Tokico D * https://www.oakos.com/TOK-DSP-10.htm

*You'd need spacers on these rear struts, if your using blob/hawk rear top mounts.
www.pedders.co.uk/sites/Pedders/5052%20fitment%20instructions..pdf

Scooby921 Strut Spacers | FastWRX.com The scooby921 version spacer are of a superior material.

 

...

 

Well, just to add my 2 pence-worth....

I went for the Ezi-Fit Pedders suspension on my widetrack Hawk STi, which was fitted in November. They replaced the stock Prodrive red springs and dampers. In my case there was no appreciable difference in ride height (good for me since the RB320 airdam on my car is already low enough).

The immediate impression I got is how smooth the car is over imperfections in the road surface compared to the stock setup. It's not night and day different, but definitely noticeable and for me is a big plus point. It's improved my enjoyment of driving on b-roads and makes the car nicer as a daily runner.

What impressed me even more is despite the improved comfort the car is held flat under hard cornering (towards the limit of grip). I recently got to test it on my favourite S bend, taken at 70 mph, where the car is first loaded in one direction, then immediately switching to the other side. The car stayed flat.

In my view the Pedders struts are an excellent choice for fast road use, especially for their price. On UK roads you need a setup that will absorb bumps without upsetting the balance of the car during cornering. To maintain grip you want the tyres to stay planted on the road, so you want some compliance in the suspension. I had KW V3 coilovers on one of my previous scoobies (at considerable cost). I'd pick the Pedders over those without question....for fast road use.

Now, if you want to put the car on track frequently, or you want to lower it, then obviously, that's where coilovers would be the way to go, but don't buy cheap crap.

Note - I too was worried about the reported knocking of the Pedders suspension. I've been listening for it over the last 2 months. I admit, every now and again, I notice it. Must be down to the specific road surface and speed creating a resonance or something. It's not something I encounter often and the car has been driven as a daily driver since the suspension change. I have no concerns.

 

Update from another thread:
<<There was a Prodrive red 05 sti spring set S05/D5/001 - Compared to a stock STI they were 18mm lower at the front and 8mm lower at the rear.>>

So the setup I replaced was already lower than stock. My red springs had the above code on them.

 

Would you measure your Pedders STI widetrack ride heights? There's no info on this, as yet.

What are the wheel centre up to metal arch (not the plastic liner) measurements? And how much fuel in the tank, when you take the measurements.

If it's difficult to get at the wheel centre (due to the wheel design), or you want to do it more accurately, use this method:

Hook the tape on the wheel rim nearest the ground. Measure vertically upwards, across the wheel centre, to the metal arch = x

Then, hook a tape on the wheel rim, measure across the wheel centre to the outer edge of the rim, on the opposite side of the wheel - divide this measurement by 2 = y (y is, obviously, the same on all 4 wheels).

x minus y = ride heights

There will probably be a 5mm, side to side, ride height difference - this is normal.

 

Will do.

 

 

...

 

Defo no warn droplinks on my car. They've all been changed recently. In any case, this knocking noise is much more subtle than a droplink.

 

2 Pot, I have the data, measured using method 2 (more accurate)

Front Nearside = 588-475/2 = 350.5
Front Offside = 586-475/2 = 348.5

Rear = 571-475/2 = 333.5 (same both sides)

I didn't measure each wheel. I'm assuming that the alloys should be 475mm across in all cases.

What does this tell us?

 

It tells us your 35mm lower at the front and 15mm at the rear. Should "look" ok and make the car lean into the front corner when cornering on a trailing throttle, rather than lean into the back corner. You should find a bit of "lift off" oversteer but not too much.

 

I haven't measured the Pedders STI springs and dampers.

My findings, on other struts, have been:
Any lower than 360mm at the front, and you've very little bump travel left. So, the bump stop length and durometer selection become critical.
The RB320 ran inverted struts, with the front ride height being 31mm lower than the stock widetrack STI, but they had clever damping, in combination with short, progressive, bump stops.
IMHO, any lower than 350mm (or above 370mm) at the rear, in combination with a 360mm front, adversely effects handling, on a road car.

I think it's excellent, that Pedders have gone to the effort, to sell non-inverted STI widetrack struts. Their use of off-set front top mounts, in the kit, is a great idea.

Some helpful reading:
Some discussions about rake and inverted damper design #129 on.
https://www.scoobynet.com/177279-dam...s-forum-5.html

https://www.scoobynet.com/suspension...-allround.html

 

Ah ha, so, from your 2nd link it can be seen that since my measured ride height difference, front to back, is nominally 16mm (lower at the back), my car is in fact, level. From the thread, this looks good to me from a performance perspective.


Regarding ride height, I would maintain that my car has not been lowered in respect of the Pedders setup cf earlier configuration (Prodrive red springs). Reading the articles, the only issue is that given the spring rates for the Pedders suspension are lower than for the Prodrive springs (which is supported by my observations from driving), am I now at risk of bottoming out? Perhaps the Pedders springs have a progressive spring rate to prevent this?


After 2 months of driving, I can't report any such problems. Not that I've loaded the car up with people and driven it over poor roads to see if it bottoms out. The other point is that Subaru themselves are recommending Pedders as a replacement for the stock Eibach dampers.