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Discussion Starter · #1 ·
when tuning whats a good afr to pull on a wideband, or i dunno what its called but the x:x:x numbers. also whats the timing for our car. and one more whats the lowest and widest tire size you can run on the stock enkeis. very noobish but im tryin to learn more about the car. thx guys for ur time
 

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CArkid0101 said:
when tuning whats a good afr to pull on a wideband, or i dunno what its called but the x:x:x numbers. also whats the timing for our car.
What octane fuel are you running? What type of fuel control are you using?
Keep in mind too that just because someone says you should shoot for a specific number, doesn't mean your car is going to be happy. I'm working on a car now that when looking at wideband AFR's "should" be good, but it's pulling timing and not advancing as it should.
As far as ignition timing; stock ECU's will dip at full boost (3200 RPM's) and then steadily advance to 18-20 degrees at 7000 RPM's. If there is knock it will pull timing and you will not get that high.
Ideally you should be able to monitor both.

P.S. (my $.02)
Tune for timing advance first, then clean up AFR's.
 

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Discussion Starter · #3 ·
id be tuning with 93 octane, and like i was wondering what a safe afr is, i know all cars are differen when it comes to this but how would i know im safe. im deffinetly gunna have someone help(do almost all) tuning my first time, and prolly 2nd and 3rd, but im trying to get a lil more basis of knowing going into it. And im gunna do a mail in, but i plan on having somesort of piggy back to fine tune with later. either safc, or utec are the two im lookin at. And in advancing timing, well, first off what is it, is it the timing that the plug gets a jolt and fires into the cylinder as the piston returns? and what would u want to do each for. each as in, advance or retard, and how would you know when to do both, does it go with leaning and richening? or something tottaly different? again thanks alot for all the info and help. im just startin to get into the actual car building and tuning knowledge "stage". i love learnin about this stuff
 

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CArkid0101 said:
...id be tuning with 93 octane, and like i was wondering what a safe afr is,
A safe place to start would be 11.0 AFR. From there, slowly continue leaning it out monitoring knock, AFR, and even EGT if you can. Every little piece of data helps.


CArkid0101 said:
...in advancing timing, well, first off what is it, is it the timing that the plug gets a jolt and fires into the cylinder as the piston returns? and what would u want to do each for. each as in, advance or retard, and how would you know when to do both, does it go with leaning and richening?
You right, it's where in the cycle the spark fires based on top dead center. You advance the timing for more power, but as it goes up, the chances of knock go up too. If the ECU is retarding/pulling back timing, you have knock that needs to be addressed.
Tuning is all a balacing act between; Octane/Fuel - Boost - Timing - Temps - Compression ratio
Compression ratio; is pretty much fixed (IMO on the high end) at 9.0:1. The higher the compression ratio, the higher the chance for knock.
Temps; keep them low. Keep the boost efficient, your intercooler cold and efficient, alky/H2O injection (only if you have to use these band aids). As the temps go up, so does the chance for knock.
Boost; quality boost is better quantity of boost. Don't push the turbo and make it blow hot air. If it's blowing hot air, temp goes up and so does the chance of knock. Depending on your fuel, you might make more power at 21psi. than you do at 22psi.
Timing; controlling it depends on what tuning device your using. Again as the timing goes up, so does the chance of knock.
Octane/Fuel; this is the easiest to control. With all the above things increasing the chance of knock, add a little more fuel at the right octane and you can make serious power. Not enough or some CA 91 oct. :)laugh: ).... and ping, ping, ping, ping.
Like I said, it's all a balancing act. Address all of the above factors, take it slow and monitor the changes you make and you can tune your car. :thumb:

P.S.
As far as your wheel question, post that in the handeling forum. I don't know sh!t about what fits.
 

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Discussion Starter · #5 ·
thanks larry, you cleared up alot of little questions i had in my head. I owe yea :thumb:
 
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