I love driving a computer!

[gtune4]

I have two problems now. One, I am getting code 11 and everything seems to be working fine. Also, the car feels like it is not getting the fuel it needs untill 4k rpm. Anyone else have these probs or have any suggestions?

[SpeedRacer1]

#11=Camshaft Position Sensor (aka CAS)

If your electric timing is wrong then perhaps that is why your engine feels like its not running properly until large amounts of air and fuel are being forced in.

[gtune4]

thnx, ill check it, yuri at ht said i might try to tighten my hks wastegate actu. as well.

[gtune4]

Ok. if anybody has any acceleration problems or notices a code 11, CHECK YOUR TIMING. Mine was at top dead center, which could lead to a top dead motor, now it is at 15 btdc, and the car simply hauls ***. Hope this helps somebody.

[SpeedRacer1]

Thats good to hear. Remember people, the ignition timing is supposed to be 15 degrees BEFORE top dead center.

[Rex]

Codes for reference, look on the bottom of the page for your year.

http://www.troublecodes.net/Nissan/

[gtune4]

is it really before tdc? i thought the b meant below. is this to compress the sparked fuel? if this is so, why doesn't this cause engine damage?? shows what i know.

[float_6969]

Well it's not so simple as that. Fuel doesn't igninte instantaniously. It takes time for the flame to travel from the sparkplug to the rest of the cylnder. Depending on the motor it will take anywhere from 5 degrees to 20 degrees before the piston reaches top dead center for the flame to reach it's full expansion pressure. The reason that it's called timing is because you want to "time" the ignition so that it will reach it's full pressure right as the piston reaches tdc. For more detailed info, check this out.

[gtune4]

Actually, that made alot of sense. So if you wanted to play around with the timing, would you want it closer or farther from tdc?

[Altiman94]

if you advance the timing (ie making it closer to tdc) you would have to run higher octane fuel to compensate so the gases burn faster, do you get what I'm saying? The opposite is true for retarding the spark..such as nitrous or a turbo.

[gtune4]

I think so, so advancing the timing would be to go from my factory 15 to something like 13 with higher octane. now you say with turbo you should retard, so I would go from 15 to like 17? why do this with turbo?

[SpeedRacer1]

Nissan has done all the thinking for you and retarded the timing. Let it be before you blow something up, or until you really (scientifically) grasp timing.

[DAEDALUS]

You advance your timing if you're going from 15 to 17 degrees before top dead center, not 15 to 13. You're advancing the spark relative to the #1 piston top dead center--the spark will happen sooner. When you talk about "timing" everything is relative to the #1 piston tdc . Everything else can change...cams, sprockets, spark, etc.

[GodzillaFan]

You advance your timing if you're going from 15 to 17 degrees before top dead center, not 15 to 13. You're advancing the spark relative to the #1 piston top dead center--the spark will happen sooner. When you talk about "timing" everything is relative to the #1 piston tdc . Everything else can change...cams, sprockets, spark, etc.

i *think* a big problem with messing with the timing on an SR is that your not just changing ignition timing, but injector timing as well... thanks to the CAS...thats why you should an aftermarket controller to mess with timing...

[NEED4BOOST]

so would the 15 degrees tdc apply to an S14 sr20det or only the s13?

-Seth

[NEED4BOOST]

i guess no one knows ::

[gtune4]

I think 15btdc applies for all ka and sr.

[SpeedRacer1]

Well the 15 degrees BTDC is from the S14 manual. It is 15 degrees BTDC for the S15, and I run at 15 degrees BTDC just fine on my S13 SR.