Advanced Timing Help....

ONLY for ADVANCED technical discussion about the 240sx!
50DegreesSideWays
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Advanced Timing Help....

Postby 50DegreesSideWays » Wed Jul 31, 2002 11:58 am

Hey whats up All...

I have a 91 Nissan 240sx and i just finished advancing the timing but i dont think i let it warm up enough before i did it so im a little confused now....

I advanced it about 3 degrees.... The diagram in my chiltons manual also looks hella different...

This is what is on my crank shaft pulley...

@ - unknown

@ - Red (10 BTDC), that is what the red notch should be..

@ - unknown

@ - unknown (I assumed this was 20 BTDC)

@ - unknown

@ - unknown

Now This is what the chiltons manual has....

@ - 5 ATDC

@ - TDC

@ - 5 BTDC

@ - (Red) 10 BTDC

@ - 15 BTDC

@ - 20 BTDC

could some one tell me what is right, and what im looking at on my pulley....??

i took it out for a drive when i was done and it ran great, i noticed a little more pull across the power band ..

Thanx

WILL

:ylsuper 91 nissan 240sx, Apex'i N1 Exhaust and susspension, Cusco front and rear strut ties, cusco front camber plate mounts


Nismo_Freak
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Postby Nismo_Freak » Wed Jul 31, 2002 11:58 am

Just advance it till it starts to knock.. then turn it back about a 1/3rd. Run premium...

50DegreesSideWays
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Postby 50DegreesSideWays » Wed Jul 31, 2002 11:58 am

Well, it didnt start knocking but it is running better... so i might just leave it where it is for now... :D

Nismo_Freak
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Postby Nismo_Freak » Wed Jul 31, 2002 11:58 am

yep... after about 3 degrees of advance you start getting into the pinging region and the car will run worse cause the ECU will retard the timing. On a cold day you can get away with 4 or 5 degrees but its pushing it.

Nismo_Freak
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Postby Nismo_Freak » Wed Jul 31, 2002 11:58 am

Sorry for the double post but also you only gain 1% torque for every 2 degrees of advance (its a general rule... many applications dont follow it directly but..).

50DegreesSideWays
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Postby 50DegreesSideWays » Wed Jul 31, 2002 11:58 am

CoO... i didnt know that rule....

I used my timing light to advance it 3 degrees and it is running fine, so ill just leave it there...

:ylsuper

240SXer
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Postby 240SXer » Wed Jul 31, 2002 11:58 am

Is it safe to advance the timing? I advanced 5 degrees on my KA24E truck and still ran regular and it was fine (faster though). Could I go with like 3 with my 240? What does the knocking sound like?

96_S14_SE
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Postby 96_S14_SE » Wed Jul 31, 2002 11:58 am

A knock sounds like....a knock :)

I have run mine at 24° btdc for over 2 yrs now :) It used to mis here and there durring one summer when I had POS bosch platnum +4 plugs in (dont know what I was thinking ??) But with the oem nkg's its no problem.

Sometimes Ill drop it down to 22° on really hot days just to keep it a little cooler, but I have both marked on the dist. so its a 10 sec job.

BUT my gf's 92 doesnt even like 22°, but her car was aquired at 145k mi and has only been treated well for 15k mi now. My car was aquired with 28k but now has 104k on it. The difference is that my nearly 80k mi, while hard miles, where well pampered mech wise.

240SXer
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Postby 240SXer » Wed Jul 31, 2002 11:58 am

What is stock on the 95? 20 degrees?

96_S14_SE
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Postby 96_S14_SE » Wed Jul 31, 2002 11:58 am

Yes, + or - 2°

240SXer
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Postby 240SXer » Wed Jul 31, 2002 11:58 am

I have it at about 25° the idle is not consistant and it knocks at low RPM every once and a while. Otherwise it's good. I'll go down to 22-23 and i'm sure it'll be better.

David.

bruinbear714
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Postby bruinbear714 » Wed Jul 31, 2002 11:58 am

I believe the chilton's manual right on this one (for once!).

If I remember correctly, the factory timing on the DE engine is at 20, which puts it on the last mark. Advancing the timing would put the pulley a little past the last mark.

96_S14_SE
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Postby 96_S14_SE » Wed Jul 31, 2002 11:58 am

Yeah 240sxer I know what you mean. A year and a half ago I had it at 24° with the bosch POS-4 plugs and my car would constantly miss (you sure its not a miss) at idle. Now with OEM plugs back in all is good and my 240 has been happy again since.

And bruin we said it was 20° + or - 2° so its acceptable to be between 18 and 22° BTDC. And you dont use an adjustable light? So much more accurate :)

240SXer
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Postby 240SXer » Wed Jul 31, 2002 11:58 am

Actually I think it is missing.. Only at low rpms.. It pulls a little harder though. I'm gonna lower it as soon as I get off my lazy ***. Probably 23. I might have it even higher than 25. It's pretty far away. I meant to change it but then it seemed fine the first time I did it.


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