RCE - Racecomp engineering coils

[gskv]

Anyone install these on the gen2 yet? Anyone know if they're properly setup for the gen2, or are they just gen1 parts that fit in the gen2?

Saw over on ********* that Ohlins is creating a set specific to gen2...making me rethink about my purchase :\

[justinco]

They have a specific page for the 2022+ Tarmac 2 system. Haven't installed them myself, you can reach out and ask them, they are usually good with support.

https://www.racecompengineering.com/...-2022-brz-gr86

[beat1]

I have the RCE superstreet coilover from gen1 and it fits perfectly fine. I saw they now have a page for the 2022+ but not sure if anything has changed. Like said above, contact them, they have very good support and response times.

[Racecomp Engineering]

We've got a whole bunch of RCE coilovers out there on 22+ cars...they're awesome on the new cars.

We chose not to do make all new coilovers just for 22+ for a couple of reasons. They're not exactly the same car, but overall weight and weight distribution are essentially the same. There's a bigger difference depending on whether it's me or Myles or Larry in the driver's seat.

There are 2 small differences in the rear end of the car.

1. Increased rear motion ratio
2. Increased rear track width

The increased rear motion ratio changes the wheel rate (or spring rate at the wheels) a tiny bit. The 336 lbs/in springs on our RCE SS1 coilovers are about 10 lbs/in stiffer at the wheels with the new car vs old. That's not very much and you can't really get coilover springs in increments of 10 lbs/in anyway. But this means a slight increase in front grip and the tendency to oversteer.

On the other hand, the increased rear track width increases rear grip and reduces the tendency to understeer.

So there are 2 small but counteracting effects. Do they balance out? We did an analysis of the total lateral load transfer distribution (TLLTD) of each car which indicated that these two changes do essentially balance out in terms of oversteer and understeer. More overall grip and cornering force would be expected on the second generation car, but handling balance is very similar.

Here's a write up I did with more detail:
https://www.racecompengineering.com/...ension-changes

We do recommend slightly different settings with our adjustable dampers for the new cars...just a couple clicks difference. When we're designing a suspension system, we have to keep in mind the sort of intended usage and the drivers and the types of tires and modifications that people use. It's a range and that range is generally a lot bigger than the relatively small change from 1st to 2nd gen.

IMO one of the bigger changes is the stiffer chassis structure, which is harder to quantify. There's the increase in overall rigidity (which is sort of an increase in overall spring rate) but that also means the new car is more sensitive to suspension changes.

Keep in mind Ohlins for example (which are great!) redesigned their coilovers 3 times just for the first gen...and we like their first version the best. I think in some cases the "new" coilovers that are being released aren't necessarily being done because the car is different.

- Andrew

[Racecomp Engineering]

We do have 1st and a 2nd gen shop cars, and all new products are being developed on both platforms while existing products were (heavily) tested on the new platform.

Oh and it's wild to me that both the Subaru and Toyota use the same suspension for their models regardless of the tire used. There's a huge difference between the Primacies and the Pilot Sports! There's more of a handling difference between trim levels on the 2nd gen then there is between 1st and 2nd gen just because of the tire options.

- Andrew

[Decep]

That's an interesting point Andrew. I did see a random post somewhere complaining about the body roll in stock form, i bet they have the Pilot Sport tires. Also one of the reasons why im a bit cautious when people say tires are the first thing you should upgrade... i mean yeah, but it might make your car feel a bit floppier if you actually use the new grip.

[Spektyr]

Originally Posted by Decep

That's an interesting point Andrew. I did see a random post somewhere complaining about the body roll in stock form, i bet they have the Pilot Sport tires. Also one of the reasons why im a bit cautious when people say tires are the first thing you should upgrade... i mean yeah, but it might make your car feel a bit floppier if you actually use the new grip.

Body roll? On a Gen2?

Granted, I'm on BFG Comp2 A/S right now until Kansas weather decides it's done being bipolar (emphasis on the "polar"). But my car feels utterly flat even at a ton of lateral cornering. The PS4's are going back on soon, but the car is incredibly grippy and the 18" wheels tires don't seem to compress much so I don't see where anyone's getting any "body roll" complaints from.

Unless they're used to running a suspension-less go-cart or something.

[Decep]

I thought it was a strange complaint too. Dont remember if it was here or that other gr86 forum

[churchx]

Originally Posted by Racecomp Engineering

Oh and it's wild to me that both the Subaru and Toyota use the same suspension for their models regardless of the tire used. There's a huge difference between the Primacies and the Pilot Sports! There's more of a handling difference between trim levels on the 2nd gen then there is between 1st and 2nd gen just because of the tire options.

Rarely people drive on tire grip limits on public roads (and frankly, that's good). But if one drives on same speed in turn or roundabout, that is within grip limits of both ps4 & primacies, extent of roll will be same, won't it?
It's track, where one drives on limit, where different tire choice with same suspension may show the difference in handling and how matching to grip level (or not) suspension is. But .. has at least 1/10 from twin owners had ever been driven on track? Larger share vs on other cars, maybe, but far from majority.

[Racecomp Engineering]

Originally Posted by churchx

Rarely people drive on tire grip limits on public roads (and frankly, that's good). But if one drives on same speed in turn or roundabout, that is within grip limits of both ps4 & primacies, extent of roll will be same, won't it?
It's track, where one drives on limit, where different tire choice with same suspension may show the difference in handling and how matching to grip level (or not) suspension is. But .. has at least 1/10 from twin owners had ever been driven on track? Larger share vs on other cars, maybe, but far from majority.

Same car, same speed around a corner, then yes same body roll.

But the differences are still VERY apparent on the street. More to a tire then overall grip, of which there is still plenty more of with the PS4 tires.

- Andrew