I've been reading about the old Mark 1 and 2 Sirion and it's struck me that the 1.3 models were renowned for their lively engines. It seems that the horse-power varies from 100-110BHP. The 1.3 Copen puts out around 87BHP. Would it be a relatively straightforward job of installing a Sirion ECU in the Copen? Am I right in thinking that the engine model is the same? What's also struck me is that I understand that naturally aspirated engines don't gain much power from an ECU remap, yet the difference between 87 and 100, never mind 110BHP is actually a noticeable increase in output. I wonder how Daihatsu extracted this extra power from the NA 1.3? Interestingly, the Mk3 Sirion is back to 87bhp and the 1.5 puts out 102bhp.
Hi Being a biker I would suggest that you would look into changing the cam shaft before you change the ECU. More can be gained from a high lift, long dwell cam shaft which would probably make the difference you are looking for and then remap your current ECU. While the head is off, port and polish the inlets and exhaust. You will be surprised as to what can happen.
There are different versions of the K3 engine, some rev higher, some have higher compression and some have DVVT and some even have a turbo. Then there are some other tiny differences which may vary on region which you may not expect. Below are videos of someone putting a high compression K3 from a Japanese Sirion into a Euro 1.3l Copen In this video at the 7 min mark he compares a small part on the crankshaft which are slightly different. And then there's also the immobiliser which may not work if the ECU is changed.
Thanks for your thoughts. An uprated can of not something of given much thought to before. I think I'd need on hand support, especially if it depends on a reprogrammed ECU. But it's something to consider should I come across the right mechanic.
