DSC Suspension Controller - tuning and talk

[rayzazoo]

What settings did you need to change?

Looks like a progressive front suspension rebound control.

 

[DGatzby]

Great summary @rayzazoo. I really CAN feel the independent shock control just driving down the street. That is one of its big differences that I have enjoyed.

The one item that looks interesting is the comfort numbers, and the most easy to change. Less is softer as the default or at no input from driver. Sport rides more soft than street! I am going to drive it a bit today and see if I can feel the ride difference btw Street and Sport. I’ll start there.

Let’s hear more about the acceleration deal. Ray says 1500ms, I may just change it and see if I can perceive something there too. It can accelerate if I want it to.

 

[covidcommander]

 

[rayzazoo]

Great summary @rayzazoo. I really CAN feel the independent shock control just driving down the street. That is one of its big differences that I have enjoyed.

The one item that looks interesting is the comfort numbers, and the most easy to change. Less is softer as the default or at no input from driver. Sport rides more soft than street! I am going to drive it a bit today and see if I can feel the ride difference btw Street and Sport. I’ll start there.

Let’s hear more about the acceleration deal. Ray says 1500ms, I may just change it and see if I can perceive something there too. It can accelerate if I want it to.

I think it'll be dependent on the setup. Once you hit 60mph or the threshold timer, the acceleration table is done.

So let's say est. 0-60mph - threshold timer = time not in accel table
Hellcat 3.7 s - 1.5 s = 2.2
Redeye 3.4 s - 1.5 s = 1.9
SS 3.25 s - 1.5 s = 1.75

Diablosport only spent 1 second in the accel table while DSC had 2 seconds. When Mike from DSC was made aware of the DS controller, the feedback was 1.5 seconds might be the sweet spot, but that was also for a 2015 Hellcat. Once the timer is done, it goes back to the GForce table and %.

Another thing to consider is actual 60ft times. If these are <2 seconds, then it helps explain why DiabloSport elected for only 1 second vs DSC 2 seconds.

I think a more accurate measurement is log personal 0-60 ft times. Then tweak the threshold timer.

Next, tweak the acceleration table % on the the desired amount of front soft rebound and firm rear.

This would match how the Demon is getting their launch suspension strategy: "Bilstein adaptive dampers are set to firm up compression and rebound in the rear while softening front rebound, letting the front end rise freely as weight shifts entirely to the back wheels "

Comparing the G-force table at 0.6 and Launch Start accel table:

OEM launch calibration
Front: 60% → 10%
Rear: 80% → 20%

Both ends become dramatically softer. The front can extend easily, and the rear can compress easily. This encourages weight-transfer motion, but it can also create more pitch, oscillation, or wheel hop.

User calibration
Front: 60% → 100%
Rear: 80% → 10%

This is a radically different strategy:

Front becomes much more controlled.
Rear becomes almost completely released.

It is best described as:

Firm front, very soft rear.

The acceleration itself still transfers load rearward. The stiff front controls how quickly the nose moves, while the soft rear lets the suspension absorb the torque application and load the rear tires.


For your Hellcat, I would expect 100/10 to be more effective on an unprepared surface or street-oriented tire when the problem is immediate wheelspin. The OEM 10/20 setting may work better when the surface is prepared and the tires can tolerate a more aggressive weight-transfer event.

The deciding measurements should be:

initial wheel-speed spike,
60-foot time,
wheel hop,
rear squat,
and whether the front oscillates after launch.

So between the two Accel-table options, 100% front / 10% rear is the stronger candidate for controlling wheelspin, but it should be treated as a tested calibration rather than a universal drag-suspension rule.

 

[Linda's Hell Cat]

@rayzazoo it's Great To see you posting up!

Thanks for your knowledgeable and useful information.

~Linda

 

[DGatzby]

^ nice.

I have some stuff to add for just using on the street. Cleaned it up and went down to spend $70 for this mysterious liquid so it can run for a few miles. Since Sport comfort is more soft initially than Street, first I needed to feel it.

I agree, it sure is fancy and very subtle, but it is softer!

So, without changing their program we may have something there. If Sport (suspension only) has a more aggressive response to our inputs than street AND rides initially more comfy, I’m in.

Okay, I did a read to make sure I was looking at the right numbers. With the exception of this comfort setting I do not see differences btw the three different settings, in these tables. I am no genius but just looking at the G-force table and the braking table, the numbers look identical between the three?