Hi I'm Nick and I'm joining the forum to hopefully get some information on tuning US spec Suzuki SX4s.
I use a 2007 SX4 with the J20A engine in SCCA RallyCross and am building a new engine for that purpose. The new engine starts with a J23 block that has had the bore increased to accept readily available Ford modular v8 pistons. I have a crankshaft from a J18 and am getting custom length Pauter rods made to mate everything together. Final displacement is about 2.1 liters with a 10.5:1 static CR.
I'd like to tune this engine using the oem ECU which is a Denso unit. Until that time I'll be putting up with the oem tune from a J20A which hopefully works out of the box on the Frankenengine. Engine is going back together in the February / March 2016 timeframe.
If anyone has experience with SX4 J20A tuning I'd love to hear from you.