just a quick question i have a 94 wrx import i run it on shell optimax . i also put millers octane boost in which ups the octane by 2 points. do i have to put this in every tank? As i go through quiete a lot ov petrol being young and never out of it : ) , cos its costing a fortune my friend says every other time shud do it. but then ova ppl say it needs it all the time or will damage engine ???????????????????????

 

you shouldnt have to use ocatne booster...really, it all depends on your cars mapping!!!

 

ok how do i find that out ?

 

if you use vpower then you should not need to use ob

 

I've used Optimax then V-power or Tescos 99 ron for the last 3 years and my car (93 wrx) runs fine with no OB.
Some people have mentioned on here that when the early imprezas (early 90s)were launched in Japan 100RON fuel didn't exist.
I'm guessing you have the standard ecu in it (underneath a metal plate in the passenger footwell)?

 

All fairly standard impreza's will be fine on V-Power.

As stated, 100 ron fuel wasn't the norm when the early impreza's were introduced. Early cars are also quite capable of retarding the ignition if they sense any det issues related to poor fuel quality.

 

K THEN WEL AL USE UP WHAT I HAVE LEFTAND NOT BOTHER WITH IT ANY MORE THANKS FOR INFO

 

might want to re-set the ECU when you stop using it.

 

chip fat

 

how do u reset the ecu

 

disconnect the battery for half an hour or Chris Palmer's Home Page