i've got an 89 rs305,tbi with no owners manual.i've been running 87 octane gas with no spark knock but i wonder if the computer is retarding my timing

 

87 octane is good enough for your LO3TBI. I would only use a higher octane if you start hear a knock. Then again a knock good mean other things as well...a tune up.

 

I use medium grade 89 octane. I have an 89 RS and the manual specifies if you drive like grandma going to church the regular will do it. But for any other type of other driving like driving a car load of people or medium duty stop and go, use med, and if you have detonation with that, use premium. If reg works for you, go for it, save a few bucks Then you can use that money to build your car up so it only uses premium

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1989 Camaro Convertible
dark silver w/black top
305tbi, auto, all stock
posi w/drum brakes
Check out my site at: http://members.tripod.com/philsriceb...Boy%20Page.htm

 

87 or 89 are fine if the timing in your car is still at stock settings. if you want to advance your timing for more performance then you may hafta move to a higher grade to take full advantage.

lata
tim

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91 Camaro RS-LO3,Auto.
14.301 @ 94.39mph
The car is going street strip for next season. 13's here i come!!!!!
Edlebrock TES Headers, Cat Eliminator Pipe, Borla Adjustable Cat Back,Marche Pulleys, HyperTech Chip,Transgo Shift Kit,B&M Convertor(2000stall),Steve Spohn Rear Rig( all rod ends), Poly Front Bushings,Ported TB, 350 Injectors, Edlebrock Performer TBI Intake, Performer Heads, 1.6 Roller Tipped Rockers
http://www.mycar.net/mafb/registry/detail.cfm?id=299

 

My timing is Advanced 8* and run 92. I don't have a problem with knock while it's cold, but as soon as the car gets hot (200-220) It starts to knock under load.

Nothing a 160 stat and loweer temp fan switch won't fix!! =)

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1991 RS
A couple of mods.....still slow
Team Hells A-Holes

 

thanks,is there a tech article on advancing the timing?

 

89ragtop,did your car come with a manual for the top

 

That it did, all the manuals were included with the car including the top manual. They are in fair shape considering their age. Why do you ask?

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1989 Camaro Convertible
dark silver w/black top
305tbi, auto, all stock
posi w/drum brakes
Check out my site at: http://members.tripod.com/philsriceb...Boy%20Page.htm

 

i was wondering about proper operation and maintainance of my top and concidering that our cars are modified by asc,i was'nt sure it would be covered by the owners manual.i've wondered why a removable hardtop was never offered.with two mounts in front and one in the center of the back,it would seem a natural.then i could drive in bad weather with the cloth top safe under the cover