97gst_spyder
10+ Year Contributor
- 2,264
- 16
- Sep 1, 2008
-
Lakeland,
Florida
Anyone have a copy of the original pics on the first page?
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Just figured I'd add this to the discussion:
I've been running the Evo 8 ECU on my daily GSX for a few weeks now. I started with the TephraMOD v7 ROM, and so far I'm loving it. The car drives better than it ever has (previously only had DSMLink V2 on this car). The huge increase in low-end torque and turbo spool after some tuning is amazing, it's night and day. It feels like a new car. i'm not having any of the aforementioned issues with just some quick adjustments. It starts up immediately at any temperature and idles perfectly. The driveability is beautiful.
I too had to adjust my low RPM knock multiplier up to get rid of part throttle knock. However, and more scary, is the fact that it seems the mid and high RPM tables are not set aggressive ENOUGH, which is very scary!
Up until last night, I didn't do a pull through the full RPM range, but doing shorter pulls, I noticed I was able to tune the car significantly more aggressively on the Evo ECU without seeing knock in boost on 91 octane.. i.e., 21 psi, 17* peak timing and 11.2 AFR which would make DSMLink show significant knock pretty much as soon as full boost was reached. So, last night I decided to have a little fun and did a 1st gear pull. About halfway through the pull, I heard very audible knock (several "tick" sounds) and the Evo ECU did pick up knock, but a only a slow flash. Unfortunately I did not log the pull. The point is, with the DSM ECU, the knock would NEVER get to the point that it was audible, even if I ran the same boost/timing etc numbers. I have a feeling the knock cal is not sensitive enough at high RPM. it's not a knock threshold vs. load thing since I have that set very conservatively. Just wanted to see if any others are seeing similar things.
I'm going to start tuning it at wastegate pressure, conservative timing, listening for knock, adjusting the knock cals until it JUST starts picking up knock when I know there isn't any present and then back it off from there. We use this same strategy setting up a knock sensor calibration on a standalone EMS system such as AEM/MoTeC etc.
Beau
Have you happen to have made any progress with this? I have my car back on the road again after its last 6 month sit down and with the minor changes I have made I have noticed a lot more knock in the mid throttle range.
Originally I had the car up and running with the 96 cam sensor but this last time the car was down I swapped it over to the 98-99 style sensor. Ever since then my ecu has picked up a considerable amount more knock (it went from between 3-5 counts to over 6 in the 30-50% throttle range right before the engine transitions from vacuum to boost.) AFR's are still decent they show a dip but they aren't excessively lean or rich for part throttle driving from what I can tell, low 13's and still dropping when showing 2-3 psi positive pressure. I don't get any audible knock that I can hear. Next payday if money is available I was considering picking up an EVO8 knock sensor and installing it just to see if there is any difference. I am going to do a fresh download of a tephra mod tonight and reinstall it over the weekend just in case I accidently changed something and didn't realize it. Other than that the car drives awesome... Great power runs smooth no different from before swapping the CAM sensor.
I had to make the following changes (base --> new setting)
low: 13-->18
mid: 18-->14
high: 20-->16
After this, I rarely pick up any knock at lower RPM. Increasing the "low" to 20 gets rid of all low RPM knock, but since this car makes plenty of boost at 3800 and below, I want to make sure it's sensitive enough to pick up real knock at high boost. Also, more importantly, lowering the "mid" and "high" knock thresholds seemed to put the sensitivity right back where it should be. I'm getting knock right when I'm expecting it when I start turning the boost up on pump gas.
I adjusted these tables by logging the channels "knock base" (which is the ECU's current knock threshold based on your sensitivity settings, and the ECU's dynamic knock noise filtering), and "knock_adc_processed", which is the knock sensor's current reading. The units of both these channels are a "byte" value, converted from the analog knock sensor voltage, hence the "adc" part. Logging both of these channels along with RPM (and nothing else, to improve logging rate) should help you set your knock sensitivities correctly. You're looking for sudden spikes in "knock_adc_processed" that are not exceeding the "knockbase" value. These spikes are most likely real knock, and the "knockbase" may be too high for the ECU to consider the voltage spikes to be real knock.
That advice should help quite a bit. I will try to see if I can make time this weekend to to do some logging and see what I can come up with. I will proceed with re-installing a fresh ROM so I can see if it helps straighten up my timing issue first. As the car sits I am showing a lot of timing advance that shouldn't be so I need to get that squared away first.
Thanks.
Mike.
FYI, I replied to the other thread you created with a datalog of my car and some info.
Beau
Im on 96531706 with omni 4 bar map. ive tried other roms just to see and they never ran right.
I also changed:
Alternator Charge Current Map
Wideband controlled closed loop (this includes log wideband with ecu)
Coil Dwell for DSM ignition
Ill never go back to dsm ecu's or dsmlink.
What are you using for the dwell times? The numbers posted by 0xdead?
Anyone running 96531706 and using the AEM UEGO and have the rom setup with the Wideband patch. I have tried to impliment this a few times with zero luck. I always end up with an 02 sensor code and alt code. The patch im referring to is here:
how-to: control closed loop AFR with your wideband O2 system - Page 16 - evolutionm.net
Im pretty sure im just missing something somewhere and would like to do a compare with some one that has this setup and working and see WTH im looking past.
UEGO is installed and I successfully log it in Evoscan with it wired to the rear O2 input.
I thought initially the MUTT might be the issue but I had the info there correct. Its more of an annoyance i cant figure out whats wrong than anything. Thanks
You can email rom to g23laserrs @t yahoo dot com.