HD SYSTEMS HS TYPE COILOVER question

[Belsil80]

i have a set of the HR's in my sil80, they are pretty good quality from what i can tell. the damper adjust is really good, on its softest you can barely tell you have coilovers, but when done up they are quite stiff. they can be lovered very low too, my car sat about 3/4 inch off the ground with plenty of lowering left.

i have used them at sandown and winton and dont have any complaints at all. they feel like they are built well too for something that cheap.

[Roy]

What do you have in your car at the moment Roy?

<{POST_SNAPBACK}>

I have the works WHiteline package...

http://www.whiteline.com.au/docs/fact_shee...line_R32GTS.PDF

... though i forget to mention i now run Kings in the front as i had some trouble with the front end of my car...and the probs are specific to my car...

If you want drift then perhaps this setup is a little too compliant and grippy for drift, though i have no idea what makes for a good drift setup, mine drifts ok with a comfie 210rwkws

Beauty of having a play at the track with the data logger is when i finally make up my mind re new susp, then i can look at the data and see if corner speed or lateral G have improved.

Can also look at Gs under acceleration and braking to see how / if the different susp has improved those aspects of the susp as well...though im dangerous with this sort of info as i dont have the knowledge yet to understand it all and interpret so to know what changes to susp can improve the setup, or what will hurt it

[Sydneykid]

quote=Josh,30 Aug 2005, 06:36 PM]

True, the are distributed by them, BUT as far as I know izimuda isnt sponsored by either, so his input would be impartial... unless they asked him to say that.. hahaha.

Oh dear, who paid for him to come to Australia?

I don't know about him, but I would hardly dump on the product when the guy who sells them is paying for me to be there. As well as loaning me the car that they are fitted to.

But seriously I reckon they seem alright, was thinking about getting some. Heard anything about them sk?

Personally I think the springs rates are way too high, the valving is simplistic and the damping adjustment is one dimensional. The only thing they have going for them is the ability to adjust the compression and extension travel independently. And that's hardly much of a compensation.

cheers

[Josh]

Good point on Izimuda.

So in other words you don't think they are much chop? For the price though would you expect a lot from them?

In your opinion SK what would you recommend as a good coilover for drift? - not too expensive, similar in price the HD coilovers.

Edited August 31, 2005 by Josh

[buz138]

Hey Guy's,

My name is Chad from Boost Bitz. I am an HSD reseller and wanted to let you know that from 1st of Sept 2005 to 30th of Sept 2005 The HSD HR coilovers to suit all models are on sale for $1700 plus delivery. Pick up is avalible from Hornsby, Sydney. For all enquiries please phone 0433 405 788.

[Josh]

Are they servicable in Australia?

[GTRgeoff]

Chad there are requirements for traders on here so contact Prank the forum owner and become a trader if you haven't already. Also at that price I would expect delivered.

They are a reasonable shock, not great and what SK says is all too true. The other compensator is the overly hard standard springs can be respecced before delivery at no extra cost. I also think they are initially too low unless you forgo some rebound travel and crank the platforms up.

For what we do with them they are fine, but too long on the track and I'd expect they will fade.

[Josh]

So not for drifting eh?

[Sydneykid]

So in other words you don't think they are much chop? For the price though would you expect a lot from them?

In your opinion SK what would you recommend as a good coilover for drift? - not too expensive, similar in price the HD coilovers.

For around the same money. you could get a set of Bilsteins with adjustable spring platforms, Eibach coils with tender springs on the rear. Plus have the shocks valved perfectly to suite the spring rates and the car weight.

I would then add a pair of adjustable Whiteline stabiliser bars to tune the handling balance. Lot's of rear bar for drift and then back it off to drive home

That would give you a far better drift package and far less hassle driving it on the road, especially in the rain.

cheers

[Sydneykid]

So not for drifting eh?

<{POST_SNAPBACK}>

One or 2 laps wouldn't be a problem early in the day, but they would boil the oil after 6 or 8 depending on the track and surface. The piston area is too small and they don't move enough oil, so the limited amount of oil though the valves creates localised heat that can't escape. The oil boils and gets air bubbles in it and the bubbles provide no dampening effect, they just goes straight through the valves.

It is one of the reason why the larger drift cars go off during an event, what works on an AE86 doesn't cut the mustard on an R34 Four door.

cheers

[Josh]

Cheers SK, I'm gunna check out prices for bilsteins etc now, see how I go.

[Sydneykid]

Cheers SK, I'm gunna check out prices for bilsteins etc now, see how I go.

<{POST_SNAPBACK}>

Let me know how you get on, I might be able to get some of what you want through the Group Buy.

cheers

[Mr_G]

Hey Guys, just digging up an old thread here, but im interested in getting some HD system HS coilovers...

Can anyone who uses them provide me some feedback since they been out almost a year now???

[eXc]

Hey all,

I am just curious what difference the damper diameter makes.

I have decided to go with coilovers with a high spring rate (sorry SK...)

I was looking at the HD Systems coil overs as they have a good rep. The higher model costs an extra $500 ish and all you get is adjustable camber tops (who cares when you have a 32!) and a larger damper diameter, I think it is 55mm vs 46mm

I am curious if the lower model are any good, and if they aren't cause of the damper size, what is a good size to have? If I had to go to the higher model I'd probably look at other brands as well (the $1300 price tag is the main pull for the HD Systems)

I know a few with the higher model and they are happy with them.

Cheers

Chris

[Sydneykid]

Hey all,

I am just curious what difference the damper diameter makes.

I have decided to go with coilovers with a high spring rate (sorry SK...)

I was looking at the HD Systems coil overs as they have a good rep. The higher model costs an extra $500 ish and all you get is adjustable camber tops (who cares when you have a 32!) and a larger damper diameter, I think it is 55mm vs 46mm

I am curious if the lower model are any good, and if they aren't cause of the damper size, what is a good size to have? If I had to go to the higher model I'd probably look at other brands as well (the $1300 price tag is the main pull for the HD Systems)

I know a few with the higher model and they are happy with them.

Cheers

Chris

<{POST_SNAPBACK}>

No apology required, whatever floats your boat.

The objective for larger diameter piston (in the shock) is to move as much oil as possible through the valves with each stroke. The more oil that moves, the better control the valves have. It also means the more oil that moves though the valve the less harsh the valving is for the same dampening force. A larger piston also means room for larger valves, this means better control. Or more valves, this means more stages in the valve control. The larger the piston, the bigger the bore for the same length shock, which means more room for more oil. More oil means less overheating and less airation of the oil. When oil boils. the valves get bubbles going through them instead of oil, this means a loss in dampening control. A larger bore also means more surface area for the nitrogen to work against, so the gas pressure is spread accross a larger intermediate piston. This means better airation control and a less harsh effect of the gas pressure on the ride comfort.

So, you could say that piston size in a shock is somewhat important. A cheap 50 mm shock may be better than a cheap 40 mm shock, but it's still a cheap shock.

cheers

[eXc]

So, you could say that piston size in a shock is somewhat important.  A cheap 50 mm shock may be better than a cheap 40 mm shock, but it's still a cheap shock.

Sorry for the late reply, I have been away camping.

So it does make a difference. How bigga difference will I notice;

1) on the street

2) on the track when I am not a great drifter. Are we talking after 5 laps it would need a 30 min cool down? or...? Will it damage the shock? or will it just not work as well while it is hot?

How big are the stock 32 gtst's damper.

Cheers

Chris

Edited January 16, 2006 by eXc

[Sydneykid]

Sorry for the late reply, I have been away camping.

So it does make a difference. How bigga difference will I notice;

1) on the street

2) on the track when I am not a great drifter. Are we talking after 5 laps it would need a 30 min cool down? or...? Will it damage the shock? or will it just not work as well while it is hot?

How big are the stock 32 gtst's damper.

Cheers

Chris

<{POST_SNAPBACK}>

Hi Chris, a 40mm piston won't work as well as a 50 mm piston ALL of the time. A 50 mm piston moves 56% more oil for the same stroke, so a 40 mm piston is going to be somewhat less effective at dampening the oscillations of the spring and the suspension. The larger wheels and tyres you have (more unsprung weight) the worse it becomes.

For the same shock length, the 56% less shock oil will overheat much faster. How long that is depends on what track, ambient temperature, dampening required, spring and stabiliser bar rate etc etc.

Standard shocks are 42 mm ID but they are twin tube, so the piston is around 33 mm. You need to ask what size the piston is in the shocks you are looking at, the "50mm shock" description usually means a 41 mm piston.

The Bilsteins in the Group Buy are also "50 mm shock" but they are monotube, which means a 46 mm piston. So the piston is 26% larger than the average twin tube "50mm shock". It's one of the reason why the Bilsteins are so effective.

Cheers

[eXc]

Hi Chris, a 40mm piston won't work as well as a 50 mm piston ALL of the time. ...

Ok, so is there any risk to damaging the shock due to the overheating issues/less oil etc ? Or will it just end up not performing as well while it is hot?

Cheers

Chris