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detonation

Old 10-05-2003, 06:19 PM
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Default detonation

I'm running 450's N/A, in my B16A and i am getting detonation just before the vtec kicks in, is there something that i have not set up properly,my settings are :-

low wide
1000 -33 -46
2000 -46 -46
3000 -46 -46
4000 -46 -46
5000 -46 -46
6000 -46 -46
7000 -46 -46
8000 -46 -46
9000 -46 -46

the unmt is at -46 wide and low
vtec is set at low - high 5800 and low - hight is 5400

Please help, i have tried setting the settings around the vtec point to all the way down to -30 and still the detonation accurs, but only just before the vtec kicks!

Thanks in advance Matt B
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Old 10-05-2003, 06:58 PM
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Default Re:detonation

Where is the timing?
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Old 10-06-2003, 01:24 PM
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Default Re:detonation

stock
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Old 10-06-2003, 02:40 PM
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Default Re:detonation

the afc advances your timing - a side effect of altering your map voltage to lean out your fuel... so you are supposed to retard your base timing. i have mine retarded two degrees on my n/a 450's hacked d16 motor. so far i haven't had any problems with detonation except when i am decelerating (no detonation on acceleration). i guess i could retard my timing more and maybe that would help...

but yeah, retard your base timing a few degrees. time to bust out the timing light . i also ONLY use 91 octane gas (highest you can get out here), so if you use that cheap 87 octane ---- you might wanna retard it more than two degrees.

let us know how it turns out bro...
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Old 10-06-2003, 07:10 PM
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Default Re:detonation

Yeah, especialy considering he is running at -46 which really ***** the map signal up and probably advances the timing a bit more. A few degrees should do you wonders.
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Old 10-07-2003, 05:06 PM
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Default Re:detonation

right , cool, i can have a look at it tommorow, i only use the car maybe once or twice a week anyways so i havent been runnin it and doin damage.

Has anyone got as link on how to change the timing?

i'm having a timing belt fitted next week so ill tell the mechinic to make sure that the belt goes on with the retarded timing back as i put it.

Thanks
Matt B
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Old 10-07-2003, 05:41 PM
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Default Re:detonation

We're talking ignition timing here. It is done at the distributor, not the timing belt, where you would change cam timing. And if you change the cam timing, you need to get some adjustable gears. The timing belt should go on with everything factory spec - ignition timing doesn't enter in here.
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Old 10-07-2003, 06:18 PM
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my bad!
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Old 10-09-2003, 02:06 AM
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Default Re:detonation

That is how we all learn here. Pick up a service manual for your car and it should all be clear. In short, you loosen the bolts on the distributor and twist it one way or the other to advance or retard the timing. On a d16 I believe you go clockwise to retard, but do't quote me. Ideally you need to use a timing light to get accurate results. Again, a $15 manual will make it all clear.
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Old 10-09-2003, 01:27 PM
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not sure how many degrees i moved the timing on the distrubutor today, what i did was marked the top of it and side and twisted it 1mm at a time and each time i moved it the car seemed to improve!!! ended up adjusting it about 5mm and now PERFECT!!

Thanks for the advise guys, you really do help on everything i post!

Thanks Matt B
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