Was looking through my "new" corolla earlier and stumbled apon all the orgional books. Turns out it was a dealers car. Not only that but with the manuals was an "emission control and maintenance guide" in which part if it lists what cars should run what ron fuel.

 

tercel with 3a-c engine 97+ ron

corolla with 4k = 89+

corolla with 4a-c = 97+

sprinter with 4a-c = 97+

celica with 2s-c = 97+

corona with 2s-c = 97+

camry wiht 2s-e =97+

supra with 5m-e = 94+

cressida with 5m-e = 94+

crown with 5me = 94+

 

This got me thinking, what was the ron of leaded fuel back then?

 

If anyone wants a cop of the stuff i'll find a way to scan/upload i guess.

4k`s spec Ron 89+ oni arr....

I'm using ron 97 all the way....

i love that 4k one. you can advance the timing and still run regular :P

leaded fuel had a higher octane than regular these days didnt it? probably around the 97, 98 mark

96 I believe. 96ron pulp is replacing the LRP at fuel stations now.

95 is pulp and 98 is optix/syn etc. When LRP came out at mobil we were basicly told it was premium with addatives but not sure how true that was.

From what I read LRP probably had MMT in it (Methylcyclopentadienyl manganese tricarbonyl not that I could remember that). It was supposed to help with the valve problems in some cars.

I used to work at BP about a year ago.

 

ULP - 91 RON

PULP - 96 RON

Ultimate - 98 RON

 

Though there is a speed shop about 20 mins away from my place, not sure if they sellit anymore, but i chucked in some 110 RON race fuel in my worked cortina at one stage and f@$k me, did that fly like it was on steriods.

 

Pity u can't buy Aviation Fuel anymore without the correct licence. I guess if anyone know's someone that's a pilot, should hook yourself up with some of that. 130 RON ;)

I possibly have access to some, don't speak to the guy much anymore though.

I researched RONs pretty heavily when LRP dissappeared from around here and I had to find an alternative for my KE-70. LRP is/was 96 RON, PULP is 95, ULP is 91 and BP Ultimate/Shell Optimax etc is 98. Because the 4k-c engine is Japanese built it was designed to run on both unleaded and leaded petrol since leaded wasn't used in Japan at the time but it was used in other markets (such as Australia). That's why no additive is needed to look after the valves. In theory the 4k-c engine is tuned to run on fuel around the 95 and above RON level. My local toyota dealer told me that the car will run best on higher octane unleaded fuels (PULP or ultimate/optimax) but he also said due to the age of the engine, using standard ULP shouldn't bother it too much. He said too that the fuel filter would probably require replacing more often than usual since PULP contains cleaning agents and LRP doesn't, so all the crap that had been building up for 20 years should come out. That has proved to be pretty true. I've had to change it about 3 times in 12 months.

 

I wish I'd known all along that it would run on unleaded without additives, I wouldn't have bothered paying the extra for LRP.

 

Anyway, I got a bit off the topic there, but someone might find that info useful.

 

matt

good info dude :D

thats basically the details i never knew, all i knew was toyota told me ULP would do, so it does :P