Hi all I'm getting my car set up next week and was wondering if it's worth running super unleaded or not. My car is a 1989 S2 rs turbo.

Fingers crossed I get half decent power. Nothing compared to some tho. Spec is s/s exhaust, filter, pro alloy intercooler, pro alloy rad, chipped ecu, piper cam ( unsure which one )

 

Should always run super unleaded m8 preferably shell optimax or bp ultimate i never run mine on anything but.

 

i would get it set up with what ever fuel is readily availble

no point putting optimax in if there is no shell garages near you

but would defo go with a readily available higher octane fuel

 

As Gus says really, just remember if you have it setup on high octane (98/99 RON) then you must always run it on that or you will risk det and destroying your engine.

 

Do to age of cvh does it not have to run on the higher octane anyway due to age???

 

I am pretty sure they are supposed to run on higher octane (super) fuel according to every book i have read about the cvh turbo engine

 

Depends if they set the base timing to the book, or if they push it to make power i suppose. Anything running over 12psi needs super IMO

 

I thought it was down to the valves like on a pinto

 

What is down to the valves?

 

Looking at his first post they will not be setting it to stock timing.
Boost pressure is irrelevant to what fuel you run, as a little less advance will stop det if your using 95RON.
Your confusing leaded and unleaded fuel with high and low octane fuel mate, old engines without hardened valve seats will burn out using UL fuel.
The octane rating of a fuel is it's Resistance to detonation and will limit the amount of spark advance that can be run and so the final power figure.

 

super unleaded isn't readily available in ireland, and i've never had issues on 95 ron,i'm running standard boost though. as said above the ignition timing will need retarding over what would be run on 98, but power won't be down too much on your set up

 

Worth mentioning in a lot of america only 92 ron is available!

 

In USA they do not use the same Octane system as the UK, in the USA the pump fuel is rated in PON (pump octane number), in the UK and Europe we use RON (research octane number).

PON is a value that comes from the RON and MON (motor octane number) value of the fuel and is a more acurate measurement of fuel rating than our RON system. To get PON you take the average of the RON and MON value of the fuel. (PON=(RON+MON)/2)

91PON is aproximately 95RON
93PON is aproximately 98RON

 

Id put the fuel in the car i would use on a regular basis on the road... That way it will be setup to match!