Rep Power: 811

Okay I'm finally getting the cam gear installed in a week. My question is what kind of octane will I need to use? I have the head milled a bit and plan to advance the timing 1 or 2 degrees (but this will be done on the dyno). I'm running 89 octane, would I need to step up to 91 if I advance 2 degrees? Is there a way to tell other than listening for knock sounds?

 
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the way i would think is just what you said, listen for knocking or you would have to do it on a dyno to check if the ecu is adjusting for knock (loss of power) otherwise just splurge 10 cents a gallon for the highest octane.

 
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but i don't wanna run higher than i need cause that has its own problems like bad gas mileage and worse power. I guess another question is how much do i actually NEED to advance timing on my setup?

 
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whats your setup anyway

 
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pnp head, milled, race valves, typhoon intake, rsr exhaust, kamikaze header, cam gear, vafcII.

 
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nice setup, i want that exhaust but too skinny for me, got some high quality work done here gearbox.
id say just try advancing it a few degrees on like 91 octane until you hear knock or see the power plateau or decrease, then if youd like to pump higher octane in everyday go further. my guess though, dont quote me, from what ive seen from other people id say maybe 3 degrees would do it but this is more of a educated guess than a proven theory.

btw did i ever leave you feeback for the gauge i bought off you?

edit: wait maybe 2 degrees, i thought you had more than i realized.

 
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can you run a cam gear and not set it up on a dyno? or would you just be causing more problems?

 
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you can run a cam gear and bolt it straight up (0 degrees advance or retarded)

 
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okay i guess i'll tell em around 1-2 degrees. I think I might leave it at 1/2 degree advance when they install it just to see what happens

 
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you can play around with it. You can get certain scanners that plug into your OBDII data port that will show you how much knock the computer is reading.

Just set it up with the octane fuel you want to run, and see where it takes you on the dyno.

 
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The higher cotane will allow you to control dentonation through tuning easier.

 
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adjusting your cam timing will not cause detonation. I have been on both sides of the gear adv/ret no detonation whatsoever on 87 octane. I am gonna guess that 2 or 3 degress advance will be the best setting for your set up..... keep us posted.

 
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I was referring to ignition timing. Not cam timing Mota.

 
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i'm only adjusting cam timing. djmota, what did you end up doing for yours and did you use dyno? i guess i'll just keep running 89 octane if its not gonna detonate.

 
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When you adjust the cam timing, it will also effect the ignition and injector timing.

 
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thats what i thought ^

 
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I don't think so. The only thing you are changing is how soon the valves open and close. Look at how a sohc aftermarket cam gear is designed. The back part of the gear does not move when you adjust it, only the center and the cam. The back part of the gear carries the metal pickup for the sensor there, and is not effected by cam timing changes. The ecu does not know you are adjusting the cam and thereby doesn't chage ignition or injector timing.

 
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My cam timing experience on a dyno was during a dyno day base line run. I came in with my cam timing set at 2 degrees retarded < I don't know why I set it there.. They let me set it once in between runs I set it at zero and gained 3hp. I then learned you should advance cam timing 1 degree for every .012" milled off a head. and saw AEM's dyno results on a 7th gen at deffernent settings, 2 degrees advance on an otherwise stock car was the best gain with the smallest sacrafice at the lower end. I then ran mine at 2 degrees advance. My idle cleared up ( I have a (milled DH head also) and I noticed a slight gain.

 
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the car may not immediately know you adjusted your cam, but it most definately will pick up on a difference in operation.
(im too tired to think right now, just woke up from a nap lol) so keep us updated.

 
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im interested to see how this works out

 
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don't worry i'll post results. so is it easy to adjust once they install it? just loosen the bolts and turn? cause i wanna play before dyno time. and i would love to see that rough idle settle down.

 
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well yes just loosen bolts and turn, but you need to be careful not to screw it up and advance it 198,355,338.5 degrees advanced.

 
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what does rod knock mean? why cant i remember?

what he is saying is do not advance it exactly 18.5 degrees
(198,355,338.5 - (550,987 x 360) = 18.5 degrees)

 
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i cant remember if the pickup for the cam position sensor is on the cam itself or on the cam gear. If its on the gear, then your right, it wont effect ignition timing.

 
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i thought on our cars its that metal plate stuck to the back of the gear with the grooves in it.

 
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yeah definitely keep posted on how this goes, ive been lookin at a cam gear myself and would like to see some real world results. i am wondering however, if i should even bother with what i have done now:
AEM CAI w/ bypass
HP Racing header
hi-flo cat
2.25" exhaust

gonna get underdrive pulleys soon though/

 
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does that translate to 0.5 degrees advance from 0?? why?

 
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haha 360 degrees = 1 whole circle, so any multiple of 360 degrees is 100% useless. Like saying advance it 360 degrees (how ever many times) would do nothing but bring it back to 0 degrees. so subtract the highest multiple of 360 from your number that fits and the remaining number is the actual degrees on a 0-360 degree scale. lol. i was bored. im in the engineering program at my college. i just finished physics homework. *sigh* i need a life.

 
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i'm confused? the gear has 1, 2, 3, 4 with lines on it. is this harder than it seems? I just assume set it to +1 and thats 1 degree advance.

 
Rep Power: 811