sanity check me on timing advance...
#1
sanity check me on timing advance...
I bumped up my timing advance a bit, and I made my knock sensors less sensitive at the same time. I was still expecting to see a little kr, to see if I had gone too aggressive with the timing. But I got zero KR.
My stock "speed bump" in the timing map was
4000 25
4400 24
4800 23
5200 26
and 28 from there on up.
I flattened it quite a bit
4000 28
4400 29
4800 30
5200 30
and 30 from there on up.
Is it reasonable to have no KR with those settings?
Or do I need to "re-sensitize" my knock sensors just a bit?
This is on a '98, using hptuners.
My stock "speed bump" in the timing map was
4000 25
4400 24
4800 23
5200 26
and 28 from there on up.
I flattened it quite a bit
4000 28
4400 29
4800 30
5200 30
and 30 from there on up.
Is it reasonable to have no KR with those settings?
Or do I need to "re-sensitize" my knock sensors just a bit?
This is on a '98, using hptuners.
#4
some people run leaner and less timing, some run richer and more timing. Both accomplishes a similar goal. Finding the perfect balance to avoid excessive EGT's might be a good idea if you haul *** around. I can run 31 with no KR, i doubt it gains any more power but it works. I think A4's unlocked have a little more tolerance given the dampening effect of the torque converter
#7
Do our engines actually need that much timing?
My FRC trapped 109.5 with only around 24 degrees of timing and nothing but Z06 mulffers and intake manifold. I was pretty impressed it went that fast with so little timing. The problem was it was Florida in July, and I didn't have a cold air intake, just a stupid K&N filter. The intake temps after sitting in the staging lane lines were 150F. They dropped to 130F by the end of the quater mile. Naturally I tried reducing the timing pulled due to AITs, but then it just knocked for real and pull the timing anyways.
I would think with a higher CR even less timing would be needed.
My FRC trapped 109.5 with only around 24 degrees of timing and nothing but Z06 mulffers and intake manifold. I was pretty impressed it went that fast with so little timing. The problem was it was Florida in July, and I didn't have a cold air intake, just a stupid K&N filter. The intake temps after sitting in the staging lane lines were 150F. They dropped to 130F by the end of the quater mile. Naturally I tried reducing the timing pulled due to AITs, but then it just knocked for real and pull the timing anyways.
I would think with a higher CR even less timing would be needed.
Last edited by Grant B; 11-06-2004 at 04:17 AM.
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#8
My stock map was at 28 after it got past the "4K speed bump".
So 30 isn't too much more than stock... I mainly got rid of most of the speed bump.
2 degrees is supposed to be around 10hp if I remember right.
So going from 23 degrees to 30 degrees at 4800 rpms could bump my hp, at that point in the curve, by about 35 at the crank or about 29 at the wheels.
The pcm will still pull timing if the iat or the ect starts climbing. That 30 is just a best case scenario. Cool weather, etc.
In my case, even though I have ported heads, I didn't opt for higher compression because I was planning for some form of forced induction later.
Oh yeah, I didn't get to run it today because I got stuck at the house with 6 hours of on-call problems from work...
So 30 isn't too much more than stock... I mainly got rid of most of the speed bump.
2 degrees is supposed to be around 10hp if I remember right.
So going from 23 degrees to 30 degrees at 4800 rpms could bump my hp, at that point in the curve, by about 35 at the crank or about 29 at the wheels.
The pcm will still pull timing if the iat or the ect starts climbing. That 30 is just a best case scenario. Cool weather, etc.
In my case, even though I have ported heads, I didn't opt for higher compression because I was planning for some form of forced induction later.
Oh yeah, I didn't get to run it today because I got stuck at the house with 6 hours of on-call problems from work...
#9
Originally Posted by John_D.
2 degrees is supposed to be around 10hp if I remember right.
#10
Very true... I was going to take it 2 degrees in either direction (4 degree range) and see which one gave me better times at the strip today. 28, 30, 32. But didn't get to make it out there today. Maybe next weekend or the following...
Mainly I just wanted to make sure I hadn't gone too far, as far as possibly detonating and not knowing it, with the knock sensors desensitized and the timing bumped up at the same time.
Mainly I just wanted to make sure I hadn't gone too far, as far as possibly detonating and not knowing it, with the knock sensors desensitized and the timing bumped up at the same time.