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Alfalfa · Alfa Arna Joined: 23 Mar 2007 Posts: 9 Location: Finland

I'm currently driving a 1990 1.7 16V with cat converter. The previous owner used unleaded 95, but I have this feeling it might not be quite enough. As I don't have the manual for 16V, does anybody know whether the car has knocking sensor (as in 1.8 turbo 75) or fuel grade selection relay (as in 75 2.0 TS)? Should I use 98? I also have a 1984 33 1.3 and a 1990 1.7 ie 8-valve, and they both feel more eager to rev with a small press on the pedal.

tvatavuk · Posted: Fri Mar 23, 2007 9:04 pm Post subject:

Yeah cated versions came with fuel selection relay adjusted for unleaded RON95.
For more info look at pages made by our moderator Scott Cool

http://www.sanderfamily.com/ under Alfa Things, Ignition Advance.

cheers
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Tino Vatavuk
Little black dress which replaced Alfa Romeo 33 S 16v Permanent 4 GMo

Scott Sander · Posted: Fri Mar 23, 2007 11:06 pm Post subject:

I run 98 octane in my 16V, it also have an aftermarket chip installed. The engine would ping otherwise. I have never noticed it pinging using 98 octane.

Of course 98 octane petrol is more expensive, but I don't want to destroy the engine because of pinging.
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Scott Sander
'91 Alfa 33 Boxer 16V Monza - Awesome
http://www.sanderfamily.com

mt · Posted: Mon Mar 26, 2007 11:46 am Post subject:

I use(d) 95 RON in my 16v non-cat, as you say using 98 makes it more responsive when applying a little pressure on the pedal at low revs acellerate harder and it seems to lose a bit of power and doesn't rev as well as 95.
Tested each grade for about 3 tanks worth.