My HS build

[rabbito]

Originally Posted by brushforhire

Going to just a higher octane and nothing else, will not give more power, on a stock yaris. Now if other things are changed and modified, that's a different story.

The only reason why a higher octane would give more power, is if the car was compensating for detonation, running rich. Since our cars are designed to run on lower octane, nothing happens by using a higher octane.

yes, running higher octane does not do anything but running higher octane, larger injector and advance timing or controling fuel does make a difference

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[brushforhire]

Originally Posted by rabbito

yes, running higher octane does not do anything but running higher octane, larger injector and advance timing or controling fuel does make a difference

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Fair enough. LoL

[Jason@SportsCar]

Originally Posted by rabbito

sway bar do make difference, so does front tower strut...higher octane do make a difference...after i upgraded to E85 with larger injectors and ecu, i gained good 10whp+

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A front strut tower brace will offer no improvement on a Yaris if you are still using the stock upper strut mounts. You have a strut that is mounted in an inch thick rubber doughnut, that is not even positively affixed to chassis, the damn thing just floats in there.

Replace the top mount with a proper bearing plate first, otherwise you are just burning money.

[ilikerice]

This exact setup? On a 5dr with 205/50/r15 on 15x5.5" rims?

Nope, but played around with front strut bars. No bueno. Actually took my front sway bar off completely at one point to help with some front tire contact in the slaloms. Just wasn't flowing for me and my driving style.
Again, to each their own. My setup has got me to a 1st place National Tour twice, but then again, my driving style is a bit different. I don't even left foot brake.

higher octane do make a difference...after i upgraded to E85 with larger injectors and ecu, i gained good 10whp+

My point was that people who drive a yaris with no mods feel that the car is faster if they use 91 octane over 87... Also, that feeling that your car is faster after you fill it up.. SMH

[ilikerice]

^^^This^^^

What I was trying to say, but much better worded and technical.

[CoryM]

I was sold by seeing the car on course from outside, photographs, experienced co-drivers' opinions (after they have driven the car), my understanding of suspension design, and that the car feels faster through many sections on course. More rubber with less dynamic load, or less rubber with more dynamic load: Unless someone does a test and tune (or some serious engineering) of both setups there is no way to confirm which nets more grip, in more situations, on this setup.