Hi! I'm currently living in Japan,tokyo A new copen(LA400K) is release in japan.(2014/06/19) But I can't like that's new model... (because, heavy body, power less engine and very confort suspention,etc...) Do you have any opinions?
I LOVE manual gearbox,ofcourse like connecting car,manually direct control and... if broken easy repair.
So you want more power! What you need is an FCD, and some sort of increase in boost control e.g. bleed valve, or actuator or electronic boost controller. They are only 63hp/47kw because of Kei law, crank up the boost a bit and it will show its true colours.
If boost up on normal turbin, maybe can't over 80ph Because for equipped turbin (RHF25) is very small and that's engine is not high rotation engine.(bore/stroke ratio:1.12)
I think you will find all Kei cars in japan are limited to 140km/h which is about 85mph. Your limit will be caused by electronics. Maybe part of the ECU via the VSS. There are products on the market such as this http://pivotjp.com/product/speed/sml-v-e.html Here in the UK, we tend to remove all Japanese speed limiters when we import grey cars from Japan.