Leaded or Unleaded?

[ddubya]

I  keep trying optimax in my 90-8v gti but i find it hard to notice a difference in performance and it seems to make it worse on fuel ie 80 miles to a tenner on optimax,and about 100 miles to a tenner on normal unleaded,im a bit wiery!

[m4nesh]

i use premium in my 1989 16v it works a treat . volkswagon recommend using 98 ron fuel (which now you cant get ) premium is 97 ron . a bit more expensive but it runs better (no more pinking hehehehe)

I thought all other premium unleaded petrol is 95 ron, super unleaded is 97 ron and Optimax is 98 Ron.

Correct me if im wrong? But Im quiet sure Optimax is 98 Ron

[golfvr6]

Correct  

[jedi16v]

your probably right . like i said to vr6 too many beers had woubles with my turds . it is super unleaded that is 97 ron not sure what optimax is never used it

[Gozza]

tis what m4nesh said.

I use Optimax in my 88 16v runs good and shifts when I want it to..........

[Blue MK2]

What exactly is a nock sensor. where/how does it work etc??

diesel was accidently put into my car but it did clean out the injectors etc etc

[golfvr6]

What exactly is a nock sensor. where/how does it work etc??

diesel was accidently put into my car but it did clean out the injectors etc etc

A knock sensor is bolted to the block and sensing the engine knocking(or pinking), this then sends a signal to the ecu to tell it to retard the ignition timing briefly. This enables the car to use 95RON fuel. They are not fitted to k-jet cars , only cars with electronic fuel injection.

[Blue MK2]

is that the sensor on the left of the oil filter?

[golfvr6]

Don't know without looking! is it bolted into the block itself?

[Blue MK2]

Im thinking its the round shaped sensor bolted to the block with a blue connector?