[datson280zxturbo]

OK im a little stupid when it comes to leaded and unleaded. what if anything would happen if i ran 110 race fuel (leaded) in my car designed for 93 (unleaded) other than a harsh drain on my wallet.

[Blazin72]

There will be no benefit to running higher octane fuel than your engine needs.

[datson280zxturbo]

i know when i had my 73 cougar it ran much better with the 110 than on 93, but it was a 351 4bbl instead of a straight 6 efi turbo.

[Brian S]

If the car doesn't ping (or does it?) on 93, why would you want 110? The lead wouldn't be good for your cats or O2 sensor.

[datson280zxturbo]

well im not running a cat nor an o2 sensor. i just figured the higher octane rating would be better. i can run 89 just fine and not have any issues. i was just told that since this is a turbo car i would get better results running 93. and well if i get better results from 93 then i should get really great results runnin 110. and like i said i had a 73 merc cougar and it ran damn good with the 110.

[johnsongrass1]

Higher octane burns slower. 110 is so slow you would probably see a EGT temps rise. To combat this you would need a increase in timing and possibly a cam change. A/F would need adjusting too. Then you would end up with less power because the race gas producing less BTU's and the fuels specific gravity would reduce fuel economy.

Race cars don't car about fuel economy or BTU's. The parameters are much looser.

Stick with 93 in which your car was designed for.

[tnoftsger]

More Octane doesn't mean more power....For optimum power you need to fire off the A/F mix in the cylinders at the optimum time, period. If you can't advance the timing enough to achieve optimum spark at the optimum time more octane can help.

If you can advance the timing enought to achieve optimum spark at the optimum time on 87 octane then any gas higher in octane is wasting money!!!!!!

[454mikey]

get a builders square, put all your studs back in then lay the square up against them and see if they all touch the straight edge. that one could have been misaligned when drilled and tapped. any off angle could cause stress.

[1ownerT]

Originally Posted by 454mikey

get a builders square, put all your studs back in then lay the square up against them and see if they all touch the straight edge. that one could have been misaligned when drilled and tapped. any off angle could cause stress.

Huh!!!!

[Blazin72]

Hmm, I think somebody posted in the wrong thread.



280zx--The last time I bought race gas I paid $5.05/gallon, the last time I bought 92 octane I paid $3.40/gallon. Why would you want to pay $1.65/gallon more for something that isnt even going to benefit you. Unless you're running lots of boost (a lot more than stock) and/or significantly increased compression then you dont really need to worry about adding the more expensive fuel. It'd be wasting money for no reason.

[datson280zxturbo]

see now this is exactly why i asked the question. as of right now im runnin a stock setup. this is not my daily driver by any means. its actually fixing to get the interior gutted and as soon as i can track down all the parts im going to try to get this thing up to around 22 psi boost or so. i may be crazy for wanting to sink so much money in a datson but i like being diffrent lol.