Ohlins updated it's R&T coil-over for our car

[strat61caster]

Instead of reading what people think the DFV does, here's the marketing version:
https://www.ohlins.com/ohlins-unique-dual-flow-valve/

[ajc209]

Originally Posted by strat61caster

Instead of reading what people think the DFV does, here's the marketing version:
https://www.ohlins.com/ohlins-unique-dual-flow-valve/

Tells us nothing really. Yes it's got three oil paths and normal dampers have just a bleed and blow off stack. What does that tell us? It's a 3bit coilover instead of 2bit?

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[strat61caster]

Originally Posted by ajc209

Tells us nothing really. Yes it's got three oil paths and normal dampers have just a bleed and blow off stack. What does that tell us? It's a 3bit coilover instead of 2bit?

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That third oil path opens during high piston speed, that means a reduced damper force or a digression or knee that's more aggressive than your average damper instead of a more linear force with damper speed found on 'sports' dampers like Koni or Bilstein or OE off the shelf.



http://www.ft86club.com/forums/showthread.php?p=1873825

[Captain Snooze]

Just get a set of KYBs and be done with it.

[nikitopo]

Originally Posted by Racecomp Engineering

We really enjoyed the old Ohlins with 6k/6k (and then changed springs to 7k/7k) on our shop car. I just wouldn't personally run the soft 4k/3k spring rates on my car.

- Andrew

Did you have a chance to test the new kit or is it just a matter of preference on spring rates? And if you say that you need much higher rates, how can you explain the spring rates of the tS car with the 18'' wheels and the PS4 tires? I calculated them to be around 3.5k/3k. Overall, 15 percent stiffer in front and 3 percent stiffer out back from the '17 rates. I cannot recall anyone in the track tests saying that it didn't ride well or that there was excessive body roll.

[ajc209]

Originally Posted by strat61caster

That third oil path opens during high piston speed, that means a reduced damper force or a digression or knee that's more aggressive than your average damper instead of a more linear force with damper speed found on 'sports' dampers like Koni or Bilstein or OE off the shelf.



http://www.ft86club.com/forums/showthread.php?p=1873825

Nope. That shock dyno lacks points to show it properly. A bleed and and blow off will give you a knee. E.g. captain snoozes ASTs he had. The third oil path or the dfv, is to smooth the knee so it not such an abrupt transition from bleeder damping to blow off damping. This is all from the Ohlins.

I think mav posted some dyno plots which show the smoother knee.

Obviously there is more to a good damper than the knee but ohlins felt from a comfort perspective the extra valve/complexity was worth it.

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[jamal]

So here's the thing that hasn't been mentioned: stability, and safety.

People think they want a neutral handling car with no understeer, but if you actually gave that to everyone who bought a set of coilovers a whole bunch more of these cars would wind up going into trees, ditches, and oncoming traffic. Backwards.

In addition to the comfy ride, and added stability, bumping up just the front rates makes the car more responsive. The front of the car really seems solid and reacts more quickly when you turn the wheel. It feels great most of the time when you are not near the limit of traction. But get close and it's going to push.

The other thing is with a RWD car you probably don't want perfectly neutral steady state balance, because that means when you try to accelerate out of a corner you're going to get oversteer. Instead you want to make the car closer to neutral when you've got the foot to the floor at corner exit. That means a car that understeers in my previous skid pad example.

So yeah, while the spring rates on these are not where I would start, for most people it's going to be fine. They're shiny, well made, have a bunch of adjustments and knobs to play with, and are going to give you a pretty comfortable ride while making the handling more responsive.

Despite the name, though, it's much more of a "road" than "track" suspension.

[ZDan]

Originally Posted by jamal

The other thing is with a RWD car you probably don't want perfectly neutral steady state balance, because that means when you try to accelerate out of a corner you're going to get oversteer.

You get more understeer as you get on the gas exiting a corner.
OFF the gas => OVERsteer. ON the gas => UNDERsteer.
At least up to impending wheelspin...

Where people get into trouble with responsive handling cars is when they lift off the gas when things start get squirrelly in a corner. Staying on the gas naturally stabilizes the rear end.

[jamal]

If front and rear tires are at the same slip angle, and you add power to the rear, that increases the rear slip angle relative to the front.

[ZDan]

Originally Posted by jamal

If front and rear tires are at the same slip angle, and you add power to the rear, that increases the rear slip angle relative to the front.

As you get on the gas while cornering, the fronts become unloaded and they see reduced grip and increased slip angle. Meanwhile the rears are loaded up more and can produce more lateral grip, even if they're expending some of that additional grip to accelerate the car.

Yes, ultimately power-on oversteer is a thing (though not so much with 150 lb-ft of 2.0 na fury...), but in general getting ON the gas induces UNDERsteer, and getting OFF the gas induces OVERsteer.

This is performance driving 101...

[jamal]

If the rear tire is already at the limit of traction, and you try to add power, what's going to happen? It has no grip left to accelerate and can't cause any weight transfer.

[strat61caster]

[emirdtm]

I am so frustrated when it comes to the r&t kit because I want it..but in order to run higher rates it needs to be revalved and that’s 800 bucks plus 2200 for the kit plus 600-800 on top hats you are looking at 4K that’s just to much.
Especially when the kit for every other chasis costs 2000-2300 like S2,evo,sti and so on and they come with everything top hats springs rates that range from 8k to 10K
This 4k 3K bs is just pissing me off how the hell do I put that with my 255’s NT01 ��

[Pat]

Talk with Vorshlag or RCE about customized B16s