There used to be a saying years ago, that if you took your Rover car to a Colliers garage to fix one fault, it would come back with two new ones.
It is in the spirit of that thought, that I start this thread.
What I'm trying to collate in this thread, is modifications to Skoda vehicles to be driven by the average person, that were implemented and gave the desired effect, but unfortunately created a new problem that meant further work was needed to accommodate the modification, or meant that the modification was abandoned and deemed to be a failure. I don't care if people disagree with individual experiences, what is going to be a problem for some folks is likely to be a positive feature for others.
I suppose I'd better give some examples of upgrades with undesirable side effects.
I once bought a tuning box for a 90BHP Seat Ibiza. It worked in conjunction with a vacuum hose, and gave a good slug of extra torque and was fun to drive when accelerating. However, it was a bit on/off in the delivery of the extra power, and what this meant was that when cruising on the motorway, a slight change on the accelerator would cause the car to surge forward undesirably. This gave the effect for passengers of driving in a car where the driver is constantly either accelerating or braking and was unable to drive smoothly. The problem was solved by the company whop supplied the box, by replacing it with a box that used electrical signals to determine how much extra power to provide, and it worked pretty well. So while I got what I wanted with the extra power, I also got something I didn't want with on/off characteristics until the box was replaced.
Catalytic convertor removal: I removed the cat on my Rover 420 to "release more power". It didn't release much extra power, but it did release a load of additional noise. This was all well and good when trying to sound cool vrooming about town, but on my daily motorway commute it did my head in, and it wasn't long until the catalytic convertor went back on and the de-cat pipe came off. Same goes for the Pipercross cone air filter I fitted. It added a load more noise, not much power (if any), and was an oily greasy mess to clean and re-oil. I'm pretty sure it had far poorer filtration ability than the OEM air-filter. So off it came.
( I appreciate that these two mods are changes that for some people would have been an unmitigated success, but for me they were failures.)
Brake upgrades that need to "warm up". Great on race tracks, downright dangerous on normal roads.
Suspension changes that lower the car so you have to modify your wheel arches, or you have a harsh ride that's only fit for a racetrack.
This thread isn't about disrespecting anyone's successful modifications that they have implemented and are very happy with.
This thread is all about capturing people's dissatisfaction with their vehicle modifications, and providing a resource of experiences that temper the natural enthusiasm of changing bits on your car without knowing all the pros and cons. I accept that what is an undesirable negative for some, may be a desirable positive for others. That's cool! So long as people can make an informed decision, that's what this thread is about.
While it's aimed at performance upgrades (which is why it's posted in this part of Brisky), but if you want to talk about upgrading bulbs that caused a load of crazy error messages to crop up unexpectedly, that's good too. If the mods want to move the thread elsewhere, then that's okay with me.
I'll start with a simple one from my experience, as I haven't actually made any performance mistakes on my car yet.
I upped the base voltage at which the Start/Stop system would activate.
I had intended this would mean the hardwired camera wouldn't be power-cycled by the stop/start system dropping the battery voltage below the "battery-saver" level set by the dash camera.
The unwanted and unacceptable side-effect, was that it effectively disabled my stop-start system as it almost never kicked in.
Now for some, that may be a very desirable feature, in which case, go for it.
But I didn't fancy being stuck on a motorway for some time in a tailback with a disabled stop-start system.
If I want the stop/start system disabled, I can press the button to disable it, I don't want it almost permanently crippled (though others may want that).
So it was reset back to the default voltage setting, lesson learned.