RDCR

So even with the full Manthey Track Kit the only mod to the suspension besides alignment settings is the KW coilover kit? Lowering the car seems to be a constant with their setup.

Mr. Adair

The kit was sent to the dealer to be installed on a 4RS that will be sold on the floor. We couldn’t access the info any other way until the kit arrived. Yes, very proprietary. So we referenced and followed that set up. I asked my mechanic to match those settings. It’s almost identical to the set up sheet that’s floating around from Misha from Apex’s customer. As others have noted they will not go beyond that spec for warranty considerations.

Mr. Adair

That’s how I understand it. They only suggest lowering 3mm. So very conservative. I know there is some opinions around here about too much lowering in regard to strut tower strength. I was concerned and asked. My mechanic who also works for a Carrera Cup team said no issues. 🤷‍♂️ we left a little rake in the car so 7mm rear and 5 front. There is actually more rake than that stock. It’s pretty high in the rear.

RDCR

Suspension 101: Question for everyone: lowering the car means less neg camber is required to attain the same handling characteristic as a higher ride hgt car with more neg camber? Since Manthey's camber setups are pretty conservative lowering the ride hgt is their way of getting around that? Is there any reason if one is going with aftermarket camber plates / LCA shims / adjustable rear toe links to not leave the ride height stock?

Mr. Adair

To get past that Manthey 2.2ish camber number you will need the aforementioned mods. The toe links with absolutely help the geometry under load in the rear. As far as dropping the car I’m positive lowering the CG is important. I felt it right away. I also went Max on the rear wing and splitter. Curious to get feedback from the more experienced track oriented guys.

168glhs1986

TPC racing says it's got to be lowered for sure.

168glhs1986

min 1:22 nice call out !!!

lovetoturn

Lowering the rear reduces rake. This transfers aero balance to the rear of the car as well transferring some of the weight to the rear axle. This will help settle the butt and reduce oversteer in the rear of the car.

Manifold

I don’t see how changing rake could have any effect on weight at the axles.

7184RS

Lowering the rear removes weight from the rear

Snowy999

Just an observation from a lowly 981 GT4 owner.

The MR spring rate on that platform is 60/80 or 80/100 if you ask for a bit stiffer (i asked about GT4RS on my MRs and they said “too high” for Cup 2s and A052s and sent me 80/100); with obv much higher damping from KW shocks. Am pretty sure it is 3/2.5 camber.

Spring rates are much, much higher on 4RS MR (120/160) plus difft valving so you will lose much less loss of camber under compression (a weakness of Macpherson Strut suspension I think) and get less “wiggle” on the back.

maybe that’s why they don't see the need to start with higher camber on cup 2rs.

4RS is awesome, pity the UK wont sell me one for my hillclimb racing….

TDT

Yep…. the whole car is a system.

Manifold

No

7184RS

Yes, that you don't know it is a completely different thing ... 101 of corner weighting a car...

"increasing the ride height of a corner increases the moment arm (or leverage) of the body to the wheel, therefore amplifying the mass on the wheel"

Manifold

No. The quote you gave pertains to lateral load, not gravitational weight.

Changing ride heights doesn’t change F/R static weight distribution, but it changes L/R static weight distribution at each axle, because a car has four wheels, not three. When you corner balance, you are effectively making sure L/R distribution is equal.

Changing rake has effects on the dynamic load distribution, and therefore the handling, not the static weight distribution between axles.