JAMIE-TYPERV6
Octane Boostaholics
Lads & ladies,
Can anyone tell me if there are issues with running a JDM WRX classic on 95 RON sh*t fuel or issues with de-resticting 112kmh limiter and running them at higher speed/revs. I know STi's are a no-no... but I never thought WRX Imports where mapped as agressively for 100RON fuel in Japan!..I've being contemplating buying a JDM Wagon (BTW are these all 260bhp....?) as there are more around than a standard Irish cars... but have concerns over fuel det problems! Just read the below on Scoobynet which got me thinking...
I believe a major cause of import WRX's going bang is not the fuel quality but the smallish top mount intercooler losing all efficiency over 100mph. Due to Japanese Law the imports were designed to shut down at 180 km/h {112mph} and the first thing we do when we get them over here is change the speedo output to read in miles per hour. This effectively moves the 112mph limiter on the ECU up to 180mph. Over 100mph, especially on the early cars, the intake charge slowly rises due to the brick shape front end and small aperature that the intercooler has to rely on to get air to pass through the intercooler. Fit an air temp meter to the intercooler/throttle and watch it slowly climb to quite scary figures when pushing on over the ton. I believe this in conjunction with the poor positioning of the fuel pressure regulator is biggest reason why the JDM cars go bang in this country and not down to the grade of fuel
It was never in the JDM cars design brief to exceed 112mph and thier priority was accelaration. The UK/Euro cars had a design brief/spec that had to include high speed runs over 112mph and this could only be achieved with any reliability by resrticting the ignition advance/power output to the 215bhp region. This level of timing advance/power output, along with more sensitive knock correction and longer gearing, would give the performance car type figures and keep the Subaru reliabilty trait intact. When Subaru introduced the Turbo 2000 to the UK in 94 they could have quite easily to save money just straight imported the JDM cars and developed a ECU that would give close to JDM power output on our fuel but i believe this would have put thier whole reliabilty reputation on the line. So they gave the UK cars a more sensitive but softened down ECU, to cope with UK fuel grade variations, and longer gearing, to give the higher top speed.
Considering 90% of my daily commute is M11/M50 motorway... I'm a little conerned bout buying a Jap WRX! Anyone any thoughts on info on the above... or anyone had any problems with JDM WRX's shitting themselves
Can anyone tell me if there are issues with running a JDM WRX classic on 95 RON sh*t fuel or issues with de-resticting 112kmh limiter and running them at higher speed/revs. I know STi's are a no-no... but I never thought WRX Imports where mapped as agressively for 100RON fuel in Japan!..I've being contemplating buying a JDM Wagon (BTW are these all 260bhp....?) as there are more around than a standard Irish cars... but have concerns over fuel det problems! Just read the below on Scoobynet which got me thinking...
I believe a major cause of import WRX's going bang is not the fuel quality but the smallish top mount intercooler losing all efficiency over 100mph. Due to Japanese Law the imports were designed to shut down at 180 km/h {112mph} and the first thing we do when we get them over here is change the speedo output to read in miles per hour. This effectively moves the 112mph limiter on the ECU up to 180mph. Over 100mph, especially on the early cars, the intake charge slowly rises due to the brick shape front end and small aperature that the intercooler has to rely on to get air to pass through the intercooler. Fit an air temp meter to the intercooler/throttle and watch it slowly climb to quite scary figures when pushing on over the ton. I believe this in conjunction with the poor positioning of the fuel pressure regulator is biggest reason why the JDM cars go bang in this country and not down to the grade of fuel
It was never in the JDM cars design brief to exceed 112mph and thier priority was accelaration. The UK/Euro cars had a design brief/spec that had to include high speed runs over 112mph and this could only be achieved with any reliability by resrticting the ignition advance/power output to the 215bhp region. This level of timing advance/power output, along with more sensitive knock correction and longer gearing, would give the performance car type figures and keep the Subaru reliabilty trait intact. When Subaru introduced the Turbo 2000 to the UK in 94 they could have quite easily to save money just straight imported the JDM cars and developed a ECU that would give close to JDM power output on our fuel but i believe this would have put thier whole reliabilty reputation on the line. So they gave the UK cars a more sensitive but softened down ECU, to cope with UK fuel grade variations, and longer gearing, to give the higher top speed.
Considering 90% of my daily commute is M11/M50 motorway... I'm a little conerned bout buying a Jap WRX! Anyone any thoughts on info on the above... or anyone had any problems with JDM WRX's shitting themselves