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First gen 300ZX (Z31) Suspension
#1
So I started with this:
[Image: DSC_0157.jpg]

Added Ground Control sleeves and some Eibach coils (375lb front / 400lb rear:

[Image: IMG_20110730_125225.jpg]

And ended up here:

[Image: DSC_0172.jpg]

In the process of doing this, I modded the (semi trailing arm) rear suspension to allow some camber correction.

That's the easy part, now I need to come up with spring rates and some new bilsteins built to handle them. I currently have HDs, but lowering the car gets me into the bump stops more than I'd like. I've discovered that stock E46 BMW rear shocks will bolt up, so I've ordered a set of 46mm Bilstein Sports to check fitment. For the fronts, I'm looking at BMW 2002 inserts (30mm). I'm still need to call Bilstein to check dimensions before I order.

This is primarily an autox car, with some summer weekend driving. This years season has really shown me I've got a lot of work to do...
**************************
David Wright
1988 Nissan 300ZX Turbo SS #671
2000 BMW 323Ci
2003 BMW 325XiT
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#2
Very interesting.
I would be worried that the damping for a lighter BMW 2002 would come up a bit under-damped for the heavier 300ZX.

Maybe you could cut the bumpstops for more clearance?
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#3
(01-02-2014, 07:36 PM)Jeff Goji Wrote: Very interesting.
I would be worried that the damping for a lighter BMW 2002 would come up a bit under-damped for the heavier 300ZX.

Maybe you could cut the bumpstops for more clearance?

What's 1000lbs among friends? Undecided I've actually found some heavier 80s cars that use a 30mm insert as well, I'm hoping Bilstein can tell me there's either a closer application or something they can build special for me.

The plan is to get the dampers revalved anyway, so as long as the insert fits properly I should be fine?
**************************
David Wright
1988 Nissan 300ZX Turbo SS #671
2000 BMW 323Ci
2003 BMW 325XiT
Reply
#4
(01-02-2014, 10:12 PM)David Z31 Wrote:
(01-02-2014, 07:36 PM)Jeff Goji Wrote: Very interesting.
I would be worried that the damping for a lighter BMW 2002 would come up a bit under-damped for the heavier 300ZX.

Maybe you could cut the bumpstops for more clearance?

What's 1000lbs among friends? Undecided I've actually found some heavier 80s cars that use a 30mm insert as well, I'm hoping Bilstein can tell me there's either a closer application or something they can build special for me.

The plan is to get the dampers revalved anyway, so as long as the insert fits properly I should be fine?

Well, the 1000 lb difference and how the damping is effected between the two will completely depend on the motion-ratios between the two different vehicle suspension setups. Smile
The bounce frequency and critical damping will both change based on the motion ratio of the suspension.

I personally wouldn't want to swap shocks between two different brands/models of cars without a look at the dyno-graphs to make sure that they would work properly, but if you are going to have them re-valved anyway before they are swapped onto the car then it's all good. Smile

Any idea on what specs you are going to ask for?
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#5
86-91 RX-7s use a bilstein insert with a 30mm piston... it's closer to the correct weight (which doesn't really matter if you're having FCM revalve them). not sure about length...

I ran my car with custom housings and Mitsubishi 3000GT 36mm inserts that were great. 1.81" insert OD if I remember correctly.
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#6
(01-04-2014, 07:55 PM)Mike G Wrote: 86-91 RX-7s use a bilstein insert with a 30mm piston... it's closer to the correct weight (which doesn't really matter if you're having FCM revalve them). not sure about length...

I ran my car with custom housings and Mitsubishi 3000GT 36mm inserts that were great. 1.81" insert OD if I remember correctly.

I can't find an FC application for Bilstein Sports, only HDs.

I'm trying to source a set of 36mm strut housings from another 300ZX Turbo. Mine is a special model that didn't have electronic dampers, so I have the non-turbo 30mm size. 36mm would open up a lot of other options.
**************************
David Wright
1988 Nissan 300ZX Turbo SS #671
2000 BMW 323Ci
2003 BMW 325XiT
Reply
#7
Well the e46 dampers didn't buy me anything height-wise, looks like I'm back to HDs and cutting bumpstops.
**************************
David Wright
1988 Nissan 300ZX Turbo SS #671
2000 BMW 323Ci
2003 BMW 325XiT
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