Originally Posted by
Sp3no
I have an ST170 and have tried to tune it a little, for a start your lucky if you have anywhere near 170bhp, expect standard power to be around 160bhp maybe as low as 155.
I have a 12lb aluminium lightened fly with kevlar stage 3 clutch, CFM underdrive pullys, CFM exhaust cam gear retarded 8degrees, ported throttle body, dream science map, K&N typoon induction kit and mongoose cat back exhaust system and mine only made 189bhp before the recent cam adjustment. I have spent quite a bit on parts but saved money with fitting and set up as i can do this myself, but even so i feel it was money wasted. Also as a daily runner expect between 20-30mpg if your lucky, mine does 18-22mpg average
seriously mate there has to be something wrong with yours if your only getting 18-22mpg out of it. bad setup of something perhaps or duff sensors but my mate gets 32mpg out of his st170 with exhaust pulley mod and bluefin flash map and milltech cat back system.
morph, first thing to check is the throttle cable adjustment as a lot came with lose cables that didnt fully open the throttle body, hence the utterly useless power output on those effected. then pannel filter, milltech cat back and dream science remap (supposed to be loads better than bluefin). will be a nice daily driver at that although not huge power increase. exhaust is going to be mainly for noise as most of the power is had from the manifold and the rest of the system has been designed for free enough flow at full revs. milltech with decat does sound lovely though but seriously will only realistically gain a few bhp and that includes the decat and on a daily you may aswell keep the cat.
hope this helps, fairly cheap too if you dont bother with the exhaust. exhaust pulley if you want to do that should be done along with the timing belt and water pump.