GT7 + Simnet Sp Pro: best stack for trail braking?

[Lightpilgrim]

Hey guys,

I’m looking for very specific advice from people running SimNet SP Pro pedals on GT7, especially those who’ve managed to get on top of trail braking (smooth release/control) rather than just peak braking performance.

I’ve been experimenting with stacks (including YouTube setups), and my current one is:

• spring + blue elastomer + red elastomer + red spring

Before that I had a yellow spring instead of red — it felt too soft, so I went stiffer.

Here’s the issue:

• On a single lap, this setup feels precise and strong
• But over a race stint (~10–15 laps), I get significant muscle fatigue
• Especially in sequences where you need consistent trail braking (chicanes, long entries)
• I start losing control in the release phase, and lap time drops

So my feeling is:

👉 the setup might be good for peak pressure, but not for repeatable, smooth trail braking lap after lap

For context:

• I’m new to wheel + load cell (a few weeks, coming from pad)
• I’m actively doing brake drills (holding %, controlled release, etc.)

What I’m trying to understand from people with real experience:

• What stack are you running for GT7 specifically?
• How do you balance stiffness vs mid-range control (20–60%)?
• How do you know your brake is not too stiff for consistency over a stint?
• What did it feel like when you finally “got” trail braking on this pedal?

I’m not looking for generic advice — specifically from people who:

👉 use SimNet SP Pro

👉 drive GT7

👉 have solved this exact problem

Appreciate any insights.

P.S.

My gut feel is the issue sits exactly between yellow vs red spring choice.

• With yellow → too soft, I struggled to clearly distinguish 100 vs 90 vs 75% — everything felt too similar
• With red → much clearer top-end, but I get a “wall” effect in the last phase, especially above ~50%

Below ~50% I’m actually quite comfortable. The problem starts in the upper range and especially during release.

I know I could reduce force in SimNet software, but that feels like only part of the solution — it doesn’t change the mechanical feel, where the red spring seems to dominate the final phase and makes smooth bleed-off harder.

So I’m trying to understand:

👉 Is this a stack issue (too aggressive final phase)

👉 Or just adaptation to load cell braking

And specifically:

• How do you balance clear top-end differentiation without creating that “hard wall” feeling?
• Did anyone settle between yellow/red somehow, or adjust stack to smooth that last phase?

 

[Abarth_71]

I didn't bother with the spring kit. Started off just using the 3 black elastomers & spring but once I got used to them it started to feel a bit soft so I swapped out the top one for a blue. I don't have any issues trail braking in GT7, ACC etc.
It takes time to devolope the muscle memory so you're probably not doing yourself any favours by switching around as much.

 

[Lightpilgrim]

I didn't bother with the spring kit. Started off just using the 3 black elastomers & spring but once I got used to them it started to feel a bit soft so I swapped out the top one for a blue. I don't have any issues trail braking in GT7, ACC etc.
It takes time to devolope the muscle memory so you're probably not doing yourself any favours by switching around as much.

I was thinking about it to. I might simply stick to this for 3-4 weeks and see if I am able to be more comfortable. On one lap, I see an improvement because it is more precise. So I like that. Maybe I will need to give it some longer period to fully develop muscle memory

 

[Lomic]

to fully develop muscle memory

And develop muscles too, with more time, you'll be able to stay strong for longer, now it is a new effort, but you'll probably gain endurance with practice. If you find that you are more precise and faster with your setup, but it degrades over time, maybe allow your body to adapt too.

 

[Lightpilgrim]

And develop muscles too, with more time, you'll be able to stay strong for longer, now it is a new effort, but you'll probably gain endurance with practice. If you find that you are more precise and faster with your setup, but it degrades over time, maybe allow your body to adapt too.

My intuition is telling me the same, Lomic! Muscles I kind of have…I do play tennis and do a lot leg exercises. But this might be new. So will stick to it!

 

[Lomic]

My intuition is telling me the same, Lomic! Muscles I kind of have…I do play tennis and do a lot leg exercises. But this might be new. So will stick to it!

Sure but maybe this is a new way of using them, new combination of movement or muscle groups, that may result in needing some specific training or more practice to get more endurance.