Question for the tuning gods
Why not trace the load cells you are hitting then pull a little timing from the areas that you are seeing knock in. Yanking a little timing before the stair climb of knock can sometimes prevent it altogether.
Could it be my boost levels and the stock exhaust from cat to muffler? I've set the boost to about 22 psi tapering to about 19 psi (based on stock gauge) and am seeing a load spike of 265 in 3rd ... the knock isn't at the spike though. I'm working on flattening out the boost curve, so I'll post some logs when I get that taken care of. It is just kind of a pain w/o boost logging.
Thanks for the help.
sometimes 1-3 is just due to factors such as road conditions/Fuel quality/Environment. You may get 0 knock some days or 1-4 knocks others. 1-3 is safe. IF you tune to get absolute 0, you'll have to pull so much timing that the car may end up being slower than a stock map. just IMO
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Small update did a single pull this morning only up to freeway speeds because there is traffic.
Car feels alot better stripping out a lot of the timing, seems to be working harder in lower loads though but that can wait. I still have a knock, seemingly around a jump from 4 to 6 timing so i'm going to try lowering the timing a little more and work towards a clean pull.
Car feels alot better stripping out a lot of the timing, seems to be working harder in lower loads though but that can wait. I still have a knock, seemingly around a jump from 4 to 6 timing so i'm going to try lowering the timing a little more and work towards a clean pull.
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Shouldn't bee too hard to do. The knock seems to happen right at this jump then the knock sum steadily declines. Once I get a clean pull I'll post up my timing map for people to see.
I was getting this 2-3 knock sum at 3750 rpms no matter what I did.... I added fuel, pulled timing like 6 degrees, still had the knock. Finally, I just lowered the boost. I had been getting a spike to 1.5-1.6 bar, kept it at 1.4 and the knock disappeared.
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This is probably pretty n00bish of me but that is the price you pay sometimes for the most valuable of information.
Anyways, I'm doing logging of my car here with at this time 3rd gear pulls since 4th gear puts me at speeds I simply should not be traveling at. I'm getting what appears to be large quantities of knock at around 3800 rpm then spiking against at 5700 rpm. The timing at this point is very low around 2-5 and I'm coming to wonder if what I'm seeing is spark blow out.
The AFR stays around 11.5 to 11.1
The car itself is pretty much stock with a 3" helix TBE, Works Cat, o2 outlet, BR headers, and drop in filter. It does not have a mbc so the boost is only going to about 20psi according to my SW gauge.
I'm a little confused why if the timing is so low on my car in comparision to some of the others here why i get such high knock counts. A log is submitted for anyone that wants to look at it.
Anyways, I'm doing logging of my car here with at this time 3rd gear pulls since 4th gear puts me at speeds I simply should not be traveling at. I'm getting what appears to be large quantities of knock at around 3800 rpm then spiking against at 5700 rpm. The timing at this point is very low around 2-5 and I'm coming to wonder if what I'm seeing is spark blow out.
The AFR stays around 11.5 to 11.1
The car itself is pretty much stock with a 3" helix TBE, Works Cat, o2 outlet, BR headers, and drop in filter. It does not have a mbc so the boost is only going to about 20psi according to my SW gauge.
I'm a little confused why if the timing is so low on my car in comparision to some of the others here why i get such high knock counts. A log is submitted for anyone that wants to look at it.
MB
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Hi, the problem is with 9 counts of knock, you are pulling at least 3* So you have actualy got at least 5* at 3800 RPM. Now your load calc look to be way to low for 20PSI, I'm not sure why, you should be nearer 240. Looking at the rest of the thread it seems you are going in the right direction.
MB
MB
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Getting closer to 0 knock
Geting 3 knock atm with a quick spike to 4 knock count dropping as it climbs to redline.
I move the timing down 1 degree in the highlighted boxes. The ones at low load are based on logs I took at normal freeway speeds see'ing tiny knock blips when the load increases a little so I'm backing off the timing a hair.
Geting 3 knock atm with a quick spike to 4 knock count dropping as it climbs to redline.
I move the timing down 1 degree in the highlighted boxes. The ones at low load are based on logs I took at normal freeway speeds see'ing tiny knock blips when the load increases a little so I'm backing off the timing a hair.
im not an expert, but here's something you can try:
level your timing at 3k 200 220 240 and 4k 200 220 240 to 2* and see if that block helps.
Also isnt 12afr a tad high for 220 load?
level your timing at 3k 200 220 240 and 4k 200 220 240 to 2* and see if that block helps.
Also isnt 12afr a tad high for 220 load?
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Shouldn't be too bad,
You seeing the 3000rpm right? Boost is still building at that point and the AFR drops to 11.5 by the time its really going. I guess I could increase the fuel a little at like 180 200 load points at the 3000 rpm point and get it to drop even faster.
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