Although I have already done 6000km I’m still quite new to my Opel Speedster Turbo (<6 month).
As the distance covered indicates, I’m using it for my daily commute (and what a change from an old, but still newer than the Opel, Mercedes E class diesel). What a thrill in comparison!
However, mine is slightly tuned (I guess a stage 1 or so), and that, despite the slightly increased power, is root cause of some annoyance, especially when getting on the freeway.
Induction noise (I guess that’s the name) is very, very much present as the car is mounted with an open air filter, and while providing great short term fun, it also gets a bit tiring in the long run (at least for me) to have that rather loud hiss directly behind my neck.
So, I am planning to revert back to a closed air filter, the filter box seems to be easily available on eBay, but that leads to a few questions:
- I guess I need to have the ECU remapped back to original setting, assuming it has been mapped using the open filter? Also it seems like remapping is usually done with high octane fuel (99-100), but I would prefer if I can just use 95 octane, which also counts for going back to original.
- Is it a no brainer to map the to original settings, I don’t have the experience myself, but if not too complicated, I would like to ask which tools to use, where to get the binary, and perhaps if someone has a guide (preferable where I can read/store the current code in case I want to switch back some day)? An option would of cause be to have a shop do it (I guess it is a pretty standard job).
- Will the torque curve change significantly when going back to original setting (haven't had any luck searching for Speedster/VX220 Turbo torque curves)? Currently I appreciate the rather high torque at moderate RPMs (attached), which make daily, non-racing, driving fairly relaxed, -and still having the ability to make big smiles when driving a bit harder.
- Mounting the air filter box seems to be a pain if done from above, -I can just reach the current air filter, but seems to be a pain to refit anything in this location. Will it be easier to do if removing the left wheel arch and work from below? Can anyone post/send a picture or two showing how the closed air filter box is originally mounted?
Thanks in advance!