launch maps
Mar 26, 2010, 08:43 AM
#81
Tehpra, any word on the possibility to use the launch maps as a software anti-lag for in between shifts? I've been interested on making this work for awhile now.
Still trying to make the ECU lower the timing retard limit past -10 though....still no luck.
Still trying to make the ECU lower the timing retard limit past -10 though....still no luck.
Mar 26, 2010, 03:27 PM
#85
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If so, does everybody just make the knock decay timer really short to compensate?
Mar 26, 2010, 05:34 PM
#86
Couple of things can be happening to cause this. If it's real knock, it could be because of a overly rich condition(which can and will cause knock) or because of inconsistant/non-smoothed timing curve. It can also be phantom knock from something banging around in and around the engine or even valve train noise/mechanical noise.
I suggest you log AFR's during a 2-step (before and after) and adjust AFR's no richer than about 10.0:1 during the 2-step and in the low 11's during spool up. You want some extra fuel in there, but not too much that it can cause knock, while remaining safe. Once you get AFRs dialed in, look at timing and smooth out the transitions (to and from launch maps and main maps) as well as the timing curve in your launch maps. Be sure to look at a map-trace so you can see what cells your ECU is polling during a launch. You will need to re-adjust fuel when you make timing changes, so as you make the timing changes, don't forget to re-adjust your AFRs.
Mar 27, 2010, 07:44 AM
#87
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NO...do nothing to your knock sensor tables.
Couple of things can be happening to cause this. If it's real knock, it could be because of a overly rich condition(which can and will cause knock) or because of inconsistant/non-smoothed timing curve. It can also be phantom knock from something banging around in and around the engine or even valve train noise/mechanical noise.
I suggest you log AFR's during a 2-step (before and after) and adjust AFR's no richer than about 10.0:1 during the 2-step and in the low 11's during spool up. You want some extra fuel in there, but not too much that it can cause knock, while remaining safe. Once you get AFRs dialed in, look at timing and smooth out the transitions (to and from launch maps and main maps) as well as the timing curve in your launch maps. Be sure to look at a map-trace so you can see what cells your ECU is polling during a launch. You will need to re-adjust fuel when you make timing changes, so as you make the timing changes, don't forget to re-adjust your AFRs.
Couple of things can be happening to cause this. If it's real knock, it could be because of a overly rich condition(which can and will cause knock) or because of inconsistant/non-smoothed timing curve. It can also be phantom knock from something banging around in and around the engine or even valve train noise/mechanical noise.
I suggest you log AFR's during a 2-step (before and after) and adjust AFR's no richer than about 10.0:1 during the 2-step and in the low 11's during spool up. You want some extra fuel in there, but not too much that it can cause knock, while remaining safe. Once you get AFRs dialed in, look at timing and smooth out the transitions (to and from launch maps and main maps) as well as the timing curve in your launch maps. Be sure to look at a map-trace so you can see what cells your ECU is polling during a launch. You will need to re-adjust fuel when you make timing changes, so as you make the timing changes, don't forget to re-adjust your AFRs.
These are the tables I was using. Stationary rev limit is @ 5500.
Click for bigger.
Click for Bigger.
Mar 28, 2010, 06:29 AM
#88
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I see AFRs of 20:1 during two step. This is in spite of setting the AFRs on the map at the max rich setting. It is very important to not jab the throttle when going into the 2-step. SLOWLY squeeze. You will see less knock. Personally I do not think that one can be knock free in the 2-step. Fuel cut, injectors blast the chamber with fuel, repeat, etc. This is not an ideal way for the combustion process to occur. Just limit the time on the 2-step and transition your maps so that when you leave the 2-step you transition to "normal" combustion events.
Last edited by chmodlf; Mar 28, 2010 at 06:44 AM.
Mar 28, 2010, 08:49 AM
#89
I see AFRs of 20:1 during two step. This is in spite of setting the AFRs on the map at the max rich setting. It is very important to not jab the throttle when going into the 2-step. SLOWLY squeeze. You will see less knock. Personally I do not think that one can be knock free in the 2-step. Fuel cut, injectors blast the chamber with fuel, repeat, etc. This is not an ideal way for the combustion process to occur. Just limit the time on the 2-step and transition your maps so that when you leave the 2-step you transition to "normal" combustion events.
How much ignition timing are you running and are the transitions smooth? How many knock counts are you getting?
Mar 29, 2010, 05:19 AM
#90
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You're going to occasionally see lean spikes, because the stock ECU's 2-step is a fuel cut limiter. Also, you could be having misfires on top of that, which will also show up as a lean spike. The key is to get AFR's as consistant as possible. Also, if you're using a Innovate LC-1, make sure you log AFRs with Logworks, as this will poll the sensor fast enough to register what's really happening. If you use EvoScan for ish like this, you won't be able to see what's going on, because resolution is limited for the WBo2S.
How much ignition timing are you running and are the transitions smooth? How many knock counts are you getting?
How much ignition timing are you running and are the transitions smooth? How many knock counts are you getting?