New Owner Have Questions =)

[Anthony]

Simple - set your timing to 19 degrees using 93 octane and dyno the car.

Then fill the car with 87 octane and repeat the process.

The engine will pink like hell on 87 octane, which the knock sensor will detect and cause the ECU to retard the timing to hell to save your engine. This will of course lower your engine performance, and would have hurt your engine.

Pinking is the fastest way to destroy your nice shiny SR20, short of removing the oil and revving the socks off it

I don't need to prove any of this, but just go and ask any respected performance tuner (JWT would be a good one) and they'll tell you exactly what I've writen in my past two posts...

[G-Forces]

If you advance your timing or run hotter cams you NEED to get premium gas.

[02G20T]

UH yeah, I think we are still talking about a stock car. I'm sure there are any number of tweaks you could do to the engine that would REQUIRE higher octane fuels, but a stock G20 won't know the difference between 87-89 and maybe a hair with 92 but my guess is back to back dynos would show a statistical tie. :bandit:

[G-Forces]

Well even on a stock car if you advance the timing to 19 you'd better be running premium gas. I don't know if you still consider that stock but I do.

[b-b00gie]

OK, I agree with you there, just like I said before...

On a stock SR20DE there is no benefit of using higher than "regular" gasoline.


There are performance benefits which may be needed when performing modifications to your engine.


If anyone would like to read why "super/premium/ultra" gasoline has no benefit to your stock engine please read this...

http://theserviceadvisor.com/octane.htm


for further reading, follow the links at the bottom of that page.

[02G20T]

Next question, how do you advance the timing to 19 degrees and what are the benefitws and drawbacks? Thanks

[b-b00gie]

http://www.se-r.net/engine/about_timing.html