Megan Racing Coilovers keep changing height as I drive.

[DG]

"19t's are the best turbo for our cars, hands down".

That's your thesis? OK, fair enough.

Prove your thesis with data and example.

DG

[i3igpete]

Dennis, I think that's a reference to Jeremy's 19t joke thread on the other website.

[3000GTPro]

I had a really hard time understanding the tech talk about shocks, but the impression I'm getting is that the best way to go for racing is something that is custom, which fits in with my previous impressions that a lot of the best do their own custom work. I'm not interested in having the best for the track, but something good for the street would be nice. What I'm seeing here, is that even something good for the street is going to require something custom made. I suspect that I wont be able to afford anything that good for a while, but I'm not willing to give up my current ride height on my Megans yet. So for the present time being, I have to work with what I've got, and very little to add.

[mb7050]

How would you compare Ohlins PCV and DFV designs ? I found PCV series coilovers for 3000gt vr4 ( 3000 $ ) but the PCV is old design and i dont think they make coilovers for 3000gt based on DFV design . These are for the spyder soo its a compromise beetween comfort and handling maybe a bit more comfort

I could get new bilstein B6 shocks for (revalving free of charge) 380$ set of 4 ( not bad price at all !) but I would have to sleeve them elsewhere and they told me if i do so I will lost warranty . I would really want to keep Spyder original Spring Rates (below) yeah this would be maximum comfort setup and i wouldnt even need to revalve the shocks but im afraid with such soft springs and lowered about 1.5 " i will bottom out the suspension very easily ..

N/mm (lbs/in.)
Front 30 (168) 39 (218)
Rear 35 (196) 28 (157)

there are many hypercoil / bilstein coilover sleeve kit / bilstein shock combinations for other platforms but I cant find anything for 3s as usual maybe DG you could put together something for us

[DG]

I had a really hard time understanding the tech talk about shocks, but the impression I'm getting is that the best way to go for racing is something that is custom, which fits in with my previous impressions that a lot of the best do their own custom work.

Sadly, this is true.

Real race cars have more or less standardized on a specific form factor for shocks (a 1/2" Hein joint at each end) Stroke lengths and valvings are all different, but at least bolting the bloody thing into the car is simple enough.

When you go down the modified OEM car path, you suddenly have to deal with the fact that no two cars share the same shock form factor. I'm not talking about the valving here - those are also car specific, but they are analogous to the calibration file in an aftermarket ECU - I'm talking about the physical interface between the car and the shock/spring assembly.

Because they are all different, there are no economies of scale the way there is with real racing shocks. Accordingly, there's no motive for real racing shock manufacturers to get in the game.

That's one of the bits of magic with Bilstein. Bilstein is an OEM supplier and repair parts supplier, so they do have the economies of scale to build shock bodies that fit OEM cars. And amazingly, they use the same internals in ALL their shocks, so converting a $90 Bilstein into a custom valved, user rebuildable shock is a fairly simple process.

Koni is in a similar place; they too have the investment in OEM tooling and so can afford to stuff their entry-level adjustable internals into an OEM casing.

Furthermore, both manufacturers try very hard to keep things more or less similar across their product line. The outer diameter of a Bilstein shock is always the same, which means that the Bilstein coilover sleeve always fits. The outer diameter of the "foot" on an inverted monotube strut is the same as the OD on the standard shock too (the strut uses smaller diameter internals) so that same coilover sleeve fits over the strut foot too. Modifying a strut foot to take the coilover sleeve usually just means cutting a snap ring groove, which is a trivial task for any decent machine shop.

Where I'm at a bit of a disadvantage though is that I have not yet seen a 3000GT front and rear Bilstein, nor have I seen the mounting interface at the top of the shock where the upper spring hat will have to fit. I'm 80% sure of what it looks like, and I'd be able to design something in minutes once I had (they are all variations on a theme) but until that happens, I cannot say SPECIFICALLY how to do it.

So "custom" yes, but not "tough" custom, given that all the R&D for how to do this sort of stuff is already done. We're not starting from zero here.

More to follow later.

DG

[mb7050]

. The outer diameter of a Bilstein shock is always the same, which means that the Bilstein coilover sleeve always fits.
DG

Bilstein B4BOA0000187 - Bilstein Coil-Over Sleeve Kits - Overview - SummitRacing.com

so they will fit ok thanks

[Chris@Rvengeperformance]

Sadly, this is true.

Real race cars have more or less standardized on a specific form factor for shocks (a 1/2" Hein joint at each end) Stroke lengths and valvings are all different, but at least bolting the bloody thing into the car is simple enough.

When you go down the modified OEM car path, you suddenly have to deal with the fact that no two cars share the same shock form factor. I'm not talking about the valving here - those are also car specific, but they are analogous to the calibration file in an aftermarket ECU - I'm talking about the physical interface between the car and the shock/spring assembly.

Because they are all different, there are no economies of scale the way there is with real racing shocks. Accordingly, there's no motive for real racing shock manufacturers to get in the game.

That's one of the bits of magic with Bilstein. Bilstein is an OEM supplier and repair parts supplier, so they do have the economies of scale to build shock bodies that fit OEM cars. And amazingly, they use the same internals in ALL their shocks, so converting a $90 Bilstein into a custom valved, user rebuildable shock is a fairly simple process.

Koni is in a similar place; they too have the investment in OEM tooling and so can afford to stuff their entry-level adjustable internals into an OEM casing.

Furthermore, both manufacturers try very hard to keep things more or less similar across their product line. The outer diameter of a Bilstein shock is always the same, which means that the Bilstein coilover sleeve always fits. The outer diameter of the "foot" on an inverted monotube strut is the same as the OD on the standard shock too (the strut uses smaller diameter internals) so that same coilover sleeve fits over the strut foot too. Modifying a strut foot to take the coilover sleeve usually just means cutting a snap ring groove, which is a trivial task for any decent machine shop.

Where I'm at a bit of a disadvantage though is that I have not yet seen a 3000GT front and rear Bilstein, nor have I seen the mounting interface at the top of the shock where the upper spring hat will have to fit. I'm 80% sure of what it looks like, and I'd be able to design something in minutes once I had (they are all variations on a theme) but until that happens, I cannot say SPECIFICALLY how to do it.

So "custom" yes, but not "tough" custom, given that all the R&D for how to do this sort of stuff is already done. We're not starting from zero here.

More to follow later.

DG

The front bilsteins are inserts for the stock strut housing.

The rears have a snap ring that an aluminum lower spring mount sits on. The top of them is a threaded piece like a normal shock.

[mb7050]

How are you liking your rear bilsteins and tein s techs did you do the fronts yet ?

[Chris@Rvengeperformance]

How are you liking your rear bilsteins and tein s techs did you do the fronts yet ?

good so far, may do the fronts this weekend, may not, depends on if I have time. Ride is controlled and not too stiff.

[mb7050]

the problem is I have 275 19" tires all around, the huge spring perch up front will touch my tires so the coilover sleeve / hypercoil is the only way to go .