Knocking has very little to do with turbo wear, unless it’s some horrendous knock and there’s preignition in the turbo housing or reignition in the exhaust manifold / the afterburner effect
Very less likely in such a small engine, it’s a tiny little turbo with very little lag, even if you put 92 to it, the ecu will not let the thing knock, will self adjust the ignition timing etc to keep things smooth
In order to get the best performance and the engine probably has a higher compression ratio than the normal counterpart, so premium fuel is advised
Do a search and note down the compression ratio and the Ron they require in factory. Most likely it’s 95
as most of the turbo Suzuki Keri’s were adviced to 5w30 oil and premium fuel
normally they state anything below 89 as regular, and rest as premium , search the forum once irage commented very informatively
I did test drive one of these and do not assume this is a comfortable kei for normal city driving / hauling
suspension and seats are very stiff and is very rev happy, also not as economical as the normal one. Corners like it’s on rails
Obviously all that power tweaking is going to end in compromise to longevity, so expect things when u attain higher mileages, but it’s a rewarding car, even small running repairs can turn into upgrades with performance parts etc
Specific body Parts are VERY rare and expensive at the moment, so make sure u get full insurance and a very low mileage well sound example.
Engine parts are also quite rare,
A lovely little car in all, with something for the daily and many smiles for the weekend fun run.