i don't change my timing table. period. static. doesn't change.

actually it's -20 pisser juice if you want to get technical.

have i ever tuned a car? funny. try this one. how do YOU get a car to idle with 272 cams. how do YOU get a car to coast down with dieing out with 272 cams.

hmmmmmmmmm?

i know exactly what it takes to do this in an 07 lsj. what happens when gmr cams are put in? same thing with jbp cams.

can YOU run 13.2 afr at 25 degree's of timing? what happens above 12.4 afr on the lsj?

 

it would be easier if he just searches your posts

 

Oh man this is getting awesome

 

No lie.

Too bad this is all way over my head :-(

 

::shrugs::

dunno.

 

man dont listen to these haters
thats a real nice setup that ur running man
i hope to see that videos from the track man
z06 gotta loose sometime but folks on here look at it like a car that never loses
good job and good kill homie

 

it was stated that the vette was "babying" it at the track. and he still trapped 120. you are projecting a 120 trap speed for yourself. so in theory, the zo6 could still "baby" it and trap higher in the 1/4 mile. You would need a trap over 120 to just hang with him on the street. unless he is babying it on the street aswell. am i wrong? i just don't see how you could beat him in a legit race on the street with your projected time and trap speed. who knows, maybe your car will run and trap higher than you are projecting. but you did start the thread out saying that you were gonna run 11's, then you changed it to 12's when the haters came in. i just dont like to speculate. we should just put this thread on pause and wait for your track #s. that should give us a pretty good indication of the validity here.

 

how does afr NOT change when timing is changed? the way i look at it is, if the afr didnt change then why do you need higher octane fuel?

it makes sense, but i still dont fully agree. afr is messured buy how much oxygen that goes by the af sensor. if there is more unburnt oxygen doesnt that mean the afr changed (i do see you point of well then theirs unburnt fuel going past also)

thats what i dont get and is that statement true? i guess it would be true, but i still dont understand how fuel trim inst affected. i give up


edit: ok i got it. how about this. why is more octane needed, to slow the burn down, but if you change timing and not octane how do you get the same amount of fuel to burn just as long? wouldnt you add more fuel? what about that.

 

About OP:
Plain and simple you do not have a modded Z06 killer, much less a stock Z06 would most likely kill you.


About recent posts:
What are you all trying to prove exactly? A few of you seem to know what your talking about while others seem to be talking about perameters you shouldn't be changing anyway. It sounds like some of your cars would be faster if you wouldn't try to play with every single setting.

 

Because all the afr is metering is the amount of oxygen in the fuel stream then the car adjusts it's fueling as required to meet that given the amount of air coming in. Timing could be 0 and the car will still run the same afr.


The O2 sensor is not metering AIR, it's metering OXYGEN. Oxygen is found in pretty much all of the internal combustion engine's emissions: H2O, CO2, NO, O3, get it? Simply adding more air and reducing fuel will reduce CO2 and H2O, but increase NO amounts. Adding more fuel will reduce the NO created, but increase the amount of H2O and CO2. So if there is unburnt fuel coming through the exhaust from not being burned fully with too little ignition advance, then the NO numbers are decreased due to less air being present than fuel and also picked up by the O2 sensor. On the other side of the coin if the timing is advanced significantly and all the fuel gets burned, then the H2O and CO2 productions are stepped up, while the NO is reduced proportionatly.

Well there is more energy in C16 and other high octane fuels, thus it requires less to burn at the same rate than a lower octane fuel. IN FACT, the higher the octane goes the better the fuel mileage you will see at normal driving. NOW, here's the catch 22 of that situation (and this goes for any airflow mods and such also).
-----Since there is more energy present with the C16 there is also a greater potential for more power at the same usage. Since we can burn more fuel on C16 by advancing timing we can also add more fuel for the same given stroke. Since the laws of physics state energy isn't free and can't come from just nowhere and CERTIANLY can't just disappear, we have a better understanding of how adding more fuel by advancing timing will not change the AFR. This is because that thermal energy created from that extra fuel will expand more quickly than the lower octane in reference, thus increasing piston speed inside the engine. The faster the piston is moving downward on that crank during the intake cycle, the more air it will draw in per given revolution, thus we can add even more fuel and so on and so forth.
-----The other side of the coin goes for air also. Since we can cram more air in with better airflow, we can also use more fuel (which is why most people see a decrease in mileage when they add an intake or headers and such) OR since air can enter and exit the engine more freely there is less need to add extra fuel to make up the power.

You also asked the question: If you change timing but not octane, how do you get the same amount of fuel to burn just as long?

The answer is simple, you don't. This is the reason higher octane fuels just plain make more power. The reason you have to retard timing more and more as octanes decrease is because the fuel tends to EXPLODE rather than BURN. If the fuel detonates, that means the mixture inside the piston is not going to expand properly, instead it just kind of whacks away at the piston. Think of it in these terms with a crash test dummy: He's in a kia rio heading 50mph for another kia rio which is stationary and BAM smaks right into it. Granted the stationary car will move slightly, but the impact is so great that things just plain break. This is 93 octane. Now let's look at 117 octane. You are in the same Kia Rio parked right in front of the stationary Kia Rio bumper to bumper. Now you smash the gas and the other Rio starts to move with you and before you know it you're back at 50mph with no damage (pending the motor still working because let's face it, it's a Kia Rio). Granted it took a little longer to get to 50 with the 117 comparison, BUT this is kind of why we advance the timing. We give it a head start and it gives a chance for everythng to run smoothly and burn all the fuel it needs to without any of it exploding since it has a higher flash point than lower octanes.

 

corvette guys move to

http://forums.corvetteforum.com/zeromain


lol

 

street. did you check your pm's?


there is a point at which too high of octane will result in less hp. timing and fuel control can only do so much

 

funny thing is at the track this past friday i beat a 2008 c6 vette hmmm and im only running around 280whp should seen the look on his face! / carry on

 

Yes, I did.

Well no ****, we couldn't shove a 200 octane fuel down the throat of our cars and expect it to even ignite.

 

lol

true

yes i was messing with you. boredem does weird things sometimes

 

You still going to be at PRP today? I might try to make it out there if I can.

 

Yes sir, I'll be there with spare axles and tools in hand. Let's keep our fingers crossed for this cloud cover to disappear.

 

I heart lulz...ill prob be there

 

I didnt bother to read all the babble past the first page but what tires are you using?

 

245/45R17 (25.7" diameter) Nitto 555R on a 17 x 8 +40mm Konig Again 5 Opal with a 3mm spacer and NO rubbing. Also lowered on B+G springs.

 

I will be there as well. As long as the rain holds off. I dont think I'm running tonight but definately taping so that all can see.

 

Haha. I'll even pay for a camera person. I may have my friend Angie go up with me because she wants to run her Tiburon, but she's not the greatest camera crew lol.

 

I shift at 80 around 7300 in 2nd

 

Oh ok, nice. I have a pair of Hoosier QTPs 26x9.5x16 on steelies I was going to offer you if I end up being able to make it, but as of right now it looks like I have to keep the mrs. occupied for the day.

 

wow.