Sorry if this is in the wrong forum.

I recently bought up a 91 RS with 93,xxx original miles on it. Guy was the second owner, said it wasn't run all that much over the years. (Still runs strong though) Can you guys give me the specs of the 305 TBI thats in it? How much HP do they normally give out? (and how much do you think mine would be with 93k on it) What are the city and highway MPG on a car with nearly 100k? As far as I know, everything else is stock.

Thanks,
Joe

 

Just do some searched on this site. There is a TBI section.
Also, there is some info at the bottom of the page here:
http://www.cfm-tech.com/GM_tbi_tuning_tips.htm

A TBI in good running order can get high 20's to 30 MPG on the highway with careful driving. If anything, fuel mileage is their strong point.
They are not designed for higher horsepower numbers.

 

Stock hp is 170 I think. When mine was stock I could get 30 hiway easy.

 

170 HP at 4000 rpm, 255 TQ at 2400 rpm. It'll feel an awful lot stronger if you swap to 3.42:1 rear gears, especially if you do mostly in-town driving.

 

I can attest to this. While my 700R4 was in a bad way when I drove it, full throttle in 3rd was still quite lively. I can't make any claims about the fuel economy as the speedo was way out and it wouldn't stay in 4th.