105 octane???

[supergoose]

Can we run 105 octane in our cars with the stock compression? Has anyone done this?

 

[SwampAss]

It's pointless. Completely.

 

[LOL WUT]

I put 100 in today but only 1 gallon to try and help with KR. I have a gas station near by that has 110 octane but that may be a bit overkill . If you are seeing knock you can try 100, I am not sure if 105 would be overkill/hurt anything.

 

[SBSPEED3]

it wont hurt anything, but unless you are getting tons of KR/detonation its just a waste of money.
i run 91 all day long and i feel thats enough if im just putzin around town. ill add octane booster if i plan on driving it real hard

 

[MikeHTally]

It's pointless. Completely.

At least. Octane is not power.

 

[Falango]

Don't you know the formula?

(Compression + # of gauges and stickers) * Octane - curb weight + # of gears= WHP

 

[SwampAss]

Don't you know the formula?

(Compression + # of gauges and stickers) * Octane - curb weight + # of gears= WHP

lol

(9.5 + 2 (boost and scangauge II) + 0 (no stickers) * 93 -3100 + 6 =-2024.5HP!

s***!

 

[Falango]

You need more stickers, lol.

(9.1 + 2 (boost and temp) + 13 (stickers, lol)) * 94 - 2626lbs (according to my emissions testing printout), + 4 = -356.6WHP

I guess it's 4 speec auto with OD.

For the record, 5 on each side (spoiler, window, 3 on side skirts, one on bottom of front bumper) and one in front of the FMIC.

We may need to adjust this formula a bit, haha.

 

[bykeryder4life]

Can we run 105 octane in our cars with the stock compression? Has anyone done this?

compression has nothing to do with running a different octane on a street car. Octane is basically just a resistance to detonation so running higher means it wont detonate as soon as a lower octane fuel. if you run an aggressive tune with some timing then you will need that 105, otherwise its a waste of money

 

[mr_mazda329]

compression has nothing to do with running a different octane on a street car.

wow..really? Then why do higher compression cars have to run higher octane? To resist detonation. And on this car..so the ECU isnt pullin spark timing all the timing just to keep it running safely. High compression cars need higher octane.


OP..if you are getting bad KR, try some octane booster first. If it still doing it, Get some colder plugs and if still, then resort to the higher octane or Meth Injection. The only way High octane (105) is gonna hurt the car is if its a leaded race gas. If its unleaded and decently cheap (less than $7) go for it. I am currently running a 40% mix of 100 out here in the vegas summer. I think thats why they sell it here at the pumps.

goose...arent you putting down 400+ whp anyways?

 

[bykeryder4life]

Sorry dude I was just referencing to the difference between running our regular gas-91 or 93 octane vs using 105 octane or whatever on a street car(DD) with the stock compression that works for the lower octane fuels we get at the typical pump just fine. I said it has nothing to do with the octane meaning he can step up to a higher octane and nothing bad will happen from that. Your above statements are totally correct man...

 

[mr_mazda329]

Sorry dude I was just referencing to the difference between running our regular gas-91 or 93 octane vs using 105 octane or whatever on a street car(DD) with the stock compression that works for the lower octane fuels we get at the typical pump just fine. I said it has nothing to do with the octane meaning he can step up to a higher octane and nothing bad will happen from that. Your above statements are totally correct man...

Oh okay..sorry for the confusion on my part. This is true nothin bad will happen to the car running 105. My car actually pulls less spark timing running my 40% blend. So one could assume that running 105 could actually benefit, as for a decent power bump till a point, since the ECU will not have to pull any spark timing.

 

[meicalnissyen]

Don't you know the formula?

(Compression + # of gauges and stickers) * Octane - curb weight + # of gears= WHP

(cool)

awesome but you forgot to multiply by the inlet/output turbo vane count ratio

 

[meicalnissyen]

Oh okay..sorry for the confusion on my part. This is true nothin bad will happen to the car running 105. My car actually pulls less spark timing running my 40% blend. So one could assume that running 105 could actually benefit, as for a decent power bump till a point, since the ECU will not have to pull any spark timing.

in theory, but my impression is this car does not actually actively advance timing to the point of knock in real time.

rather it uses some voodoo like knock trim

so with 105 it may, lazy like, creep up on advance farther than it would on 93


leadfoot?

 

[MikeHTally]

(cool)

awesome but you forgot to multiply by the inlet/output turbo vane count ratio

Plus, you have to take the weight of the muffler bearings into account. There's a formula to calculate the blinker fluid, as well.

 

[hugador]

lol you guys okay?

 

[bykeryder4life]

in theory, but my impression is this car does not actually actively advance timing to the point of knock in real time.

it actually does, I have ran datalogs of my car just cruising and you can see the spark advance going up and up until the knock threshold where it pulls back a little. Put your car in cruise control for a while and watch the spark advance on a datalog. The car runs as much timing as possible to make good power/torque around town and still have great mpg's/emissions.

 

[Falango]

Plus, you have to take the weight of the muffler bearings into account. There's a formula to calculate the blinker fluid, as well.

I forgot to multiply by the amount of backpressure in the exhaust too, damn.

 

[MikeHTally]

So many parameters, so little time.

 

[meicalnissyen]

Plus, you have to take the weight of the muffler bearings into account. There's a formula to calculate the blinker fluid, as well.

I use the SU dry sump blinkers