Can't stop the knock
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From: In da streetz
Can't stop the knock
At least I think its knock... Whats happening is when I do a pull in 3rd or 4th from say 2k upto 7k I'm getting a lot of timing being pulled from 3,000-6,000rpm and at some rpm points it actually going negative (mostly around my peak tq). This is leaving me with a crappy curve and peak timing only at around 16* by 7k. Over the summer months my timing would only drop to about 3-5* at peak TQ and then climb steady from that point to a peak of about 21* at 7k.
My boost spikes to 1.35 bar and the stabilizes back down to 1.3 where it stays until redline. mods are just a TBE, MBC & K&N filter, I'm logging my timing with a pocketlogger. There is NO tune/flash on the ECU and I'm using an SAFCII for fuel adjustments but everything is set to ZERO at the moment. I tried to actually add fuel at the points where I see timing being pulled but it didn't help... anyone else experience something like this?
My boost spikes to 1.35 bar and the stabilizes back down to 1.3 where it stays until redline. mods are just a TBE, MBC & K&N filter, I'm logging my timing with a pocketlogger. There is NO tune/flash on the ECU and I'm using an SAFCII for fuel adjustments but everything is set to ZERO at the moment. I tried to actually add fuel at the points where I see timing being pulled but it didn't help... anyone else experience something like this?
What are your AFRs in that range? Same thing used to happen to me when I had just the SAFC, and it is the reason why an SAFC can't perform like a flash (without injectors), but you say you are experiencing this even with the SAFC set to 0?
The factory tune goes lean at peak torque and stays on the lean side up to 5200rpm. Also, the timing is pulled low at peak torque to accommodate this lean mixture. The problem with the SAFC is that we have to add fuel in this range to get the AFRs proper, but adding fuel with the SAFC causes the ECU to use a lesser timing map, which again keeps the timing low. I, too, would sometimes go as low as -1* at peak torque, and it was just unavoidable. This is why I always would dyno 25-30 more whp peak than wtq peak. Now, with the flash, my AFR goes down where it should be at peak torque and through that whole rpm range, but my timing goes no lower than 7-8*, and then it rises steadily to 20* by 7k with no dips or flat spots. The result is a HUGE improvement in low-end/mid-range torque that makes daily driving pure joy.
The factory tune goes lean at peak torque and stays on the lean side up to 5200rpm. Also, the timing is pulled low at peak torque to accommodate this lean mixture. The problem with the SAFC is that we have to add fuel in this range to get the AFRs proper, but adding fuel with the SAFC causes the ECU to use a lesser timing map, which again keeps the timing low. I, too, would sometimes go as low as -1* at peak torque, and it was just unavoidable. This is why I always would dyno 25-30 more whp peak than wtq peak. Now, with the flash, my AFR goes down where it should be at peak torque and through that whole rpm range, but my timing goes no lower than 7-8*, and then it rises steadily to 20* by 7k with no dips or flat spots. The result is a HUGE improvement in low-end/mid-range torque that makes daily driving pure joy.
Thread Starter
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From: In da streetz
Originally Posted by Warrtalon
What are your AFRs in that range? Same thing used to happen to me when I had just the SAFC, and it is the reason why an SAFC can't perform like a flash (without injectors), but you say you are experiencing this even with the SAFC set to 0?
The factory tune goes lean at peak torque and stays on the lean side up to 5200rpm. Also, the timing is pulled low at peak torque to accommodate this lean mixture. The problem with the SAFC is that we have to add fuel in this range to get the AFRs proper, but adding fuel with the SAFC causes the ECU to use a lesser timing map, which again keeps the timing low. I, too, would sometimes go as low as -1* at peak torque, and it was just unavoidable. This is why I always would dyno 25-30 more whp peak than wtq peak. Now, with the flash, my AFR goes down where it should be at peak torque and through that whole rpm range, but my timing goes no lower than 7-8*, and then it rises steadily to 20* by 7k with no dips or flat spots. The result is a HUGE improvement in low-end/mid-range torque that makes daily driving pure joy.
The factory tune goes lean at peak torque and stays on the lean side up to 5200rpm. Also, the timing is pulled low at peak torque to accommodate this lean mixture. The problem with the SAFC is that we have to add fuel in this range to get the AFRs proper, but adding fuel with the SAFC causes the ECU to use a lesser timing map, which again keeps the timing low. I, too, would sometimes go as low as -1* at peak torque, and it was just unavoidable. This is why I always would dyno 25-30 more whp peak than wtq peak. Now, with the flash, my AFR goes down where it should be at peak torque and through that whole rpm range, but my timing goes no lower than 7-8*, and then it rises steadily to 20* by 7k with no dips or flat spots. The result is a HUGE improvement in low-end/mid-range torque that makes daily driving pure joy.
Your correct about the peak tq and timing stuff, I already knew all about that stuff though. I also tried adding fuel and as expected the timing got even lower to like -3*. I just don't know why now all of a sudden my timing dropping like a rock when before in the summer months it would only go to 3-4* and then climb back up to 20* or so?
Originally Posted by AlwaysinBoost
my WB o2 is in my other car so I only have the narrowband to go off of but the reading is between .92-.94 all over. I'm am seeing a short period in the low part of the RPM band between 2-3k that is .88-.90.
Your correct about the peak tq and timing stuff, I already knew all about that stuff though. I also tried adding fuel and as expected the timing got even lower to like -3*. I just don't know why now all of a sudden my timing dropping like a rock when before in the summer months it would only go to 3-4* and then climb back up to 20* or so?
Your correct about the peak tq and timing stuff, I already knew all about that stuff though. I also tried adding fuel and as expected the timing got even lower to like -3*. I just don't know why now all of a sudden my timing dropping like a rock when before in the summer months it would only go to 3-4* and then climb back up to 20* or so?