Boost with Ecuflash
Dec 9, 2006, 12:12 AM
#16
Originally Posted by nj1266
Yeah, I read that thread. But most are trying to control boost by removing the solenoid pill or resizing it. I want to set peak boost to 22-23 psi peak and let it taper to about 19-20 w/o removing the stock pill or using a modified one.
Is that doable given the tables I posted?
Is that doable given the tables I posted?
So i dont know if you can get 22-23 without removing any pills.
Dec 9, 2006, 01:32 AM
#17
I just datalogged my car (completely stock, stock maps) for the first time, but it was just driving around during lunch, so no really good data. BUT, I am getting some knock around 3500-4000 rpms (2-6 knock sum which caused the car to pull some timing); so around peak torque. My boost also spikes to 1.5-1.6 bar depending on the air temp.
Any info on the stock MAP sensor, or rather, how accurate it is? It maxes at 328.164 Kpa according to Evoscan, which translates to roughly ~23 psi (328 kpa - ~105kpa idle reading = 223 Kpa. Idle = ~ -65 Kpa. So measured boost = 223-65Kpa = 158 Kpa = ~ 23 psi).
I'm getting the 328.164 Kpa reading up to 5.5k rpms which is as high as I've datalogged so far. But it doesn't seem to correlate to my boost gauge which recorded a peak of 1.6 bar (~23.2 psi) but quickly tapered off aftewards.
So it seems to me that the stock MAP sensor is just about worthless. I'm going to try to get a lot of good data this weekend with everything completely stock and then start tweaking the car (boost, fuel, and timing). It's a bit aggrevating that I'm getting knock with everything completely stock. Damn this Cali gas!
I'm actually thinking of reducing the Boost Desired Engine Load (as opposed to timing) around peak boost and peak torque since I'm getting some knock there. Part of the reason is that according to the Evo specs, it's only suppose to hit 20.31 psi at 3500rpm/WOT and I'm hitting at least 21.75psi. I need to see how my boost changes with RPM though... I'm going to have to do it ghetto style and use a vid camera
Any info on the stock MAP sensor, or rather, how accurate it is? It maxes at 328.164 Kpa according to Evoscan, which translates to roughly ~23 psi (328 kpa - ~105kpa idle reading = 223 Kpa. Idle = ~ -65 Kpa. So measured boost = 223-65Kpa = 158 Kpa = ~ 23 psi).
I'm getting the 328.164 Kpa reading up to 5.5k rpms which is as high as I've datalogged so far. But it doesn't seem to correlate to my boost gauge which recorded a peak of 1.6 bar (~23.2 psi) but quickly tapered off aftewards.
So it seems to me that the stock MAP sensor is just about worthless. I'm going to try to get a lot of good data this weekend with everything completely stock and then start tweaking the car (boost, fuel, and timing). It's a bit aggrevating that I'm getting knock with everything completely stock. Damn this Cali gas!
I'm actually thinking of reducing the Boost Desired Engine Load (as opposed to timing) around peak boost and peak torque since I'm getting some knock there. Part of the reason is that according to the Evo specs, it's only suppose to hit 20.31 psi at 3500rpm/WOT and I'm hitting at least 21.75psi. I need to see how my boost changes with RPM though... I'm going to have to do it ghetto style and use a vid camera
Dec 9, 2006, 02:48 AM
#18
heyzeus11 has pretty much answered nj1266. I would set one of the maps (say 150+100 mid, tapering to say 120+100 at the top or whatever you want/your engine likes/needs) and simply copy to the others.
I run 285 fuel cut with 1000ms delay. So it will cut the fuel if the load is over 285 for 1 sec. It does work as I have tested it. I see no advantage at all in disabling fuel cut, you're just removing safety devices.
I run 285 fuel cut with 1000ms delay. So it will cut the fuel if the load is over 285 for 1 sec. It does work as I have tested it. I see no advantage at all in disabling fuel cut, you're just removing safety devices.
Dec 9, 2006, 07:41 AM
#20
Ok, Based on the advice from jcs and heyzeus, I came up with the following boost mix. Please tell me if this will give me the 22-23 psi and taper to 18-19 like I have with the xede.
I did not set the three boost tables the same. I simply tapered 1 and 2 differently than before.
Should I taper the boost limit table like the stock one does, ie, set it @ 275 and then taper it below that from 6k rpm.
I welcome all opinions on this. Thanks for all the help so far.
I did not set the three boost tables the same. I simply tapered 1 and 2 differently than before.
Should I taper the boost limit table like the stock one does, ie, set it @ 275 and then taper it below that from 6k rpm.
I welcome all opinions on this. Thanks for all the help so far.
Dec 9, 2006, 08:15 AM
#21
I would get rid of the dip at 3500 RPM, and make table 2 the same as 1 & 3. Unless the wastegate jams shut you won't be able to get 275 load at high revs on the stock turbo. I would run it at 20 above target through the rev range ie 251.9 at 7000.
Dec 9, 2006, 09:08 AM
#22
JCS, you're lucky with the 3bar MAP sensor! I'm not quite sure why mine (05 Evo) works the way it does.... reads ~105 Kpa at idle which is pretty much the same as the barometric. It should only be reading ~34 Kpa due to the vacuum... well, unless it's before the throttle body. If that were the case though, then the 328 Kpa would translate to ~32 psi and I'm sure as heck not getting anywhere close to that. So it doesn't quite make sense.
Naji, did you have to take out one of the stock restrictor pill in the boost line for the Xede? If so, make sure you put it back in before you try running those boost maps.
Naji, did you have to take out one of the stock restrictor pill in the boost line for the Xede? If so, make sure you put it back in before you try running those boost maps.
Dec 9, 2006, 09:39 AM
#23
Originally Posted by spdracerut
Naji, did you have to take out one of the stock restrictor pill in the boost line for the Xede? If so, make sure you put it back in before you try running those boost maps.
Dec 9, 2006, 10:12 AM
#25
Sometimes loadcalc is a bit optimistic.
If you are now using external boost control and you want the same boost then set the target to what you think your load is now.
Set the boost limit comfortably above this so you only get a fuel cut if there is a fault.
If you are now using external boost control and you want the same boost then set the target to what you think your load is now.
Set the boost limit comfortably above this so you only get a fuel cut if there is a fault.
Dec 9, 2006, 08:41 PM
#26
Originally Posted by jcsbanks
If you are now using external boost control and you want the same boost then set the target to what you think your load is now.
Set the boost limit comfortably above this so you only get a fuel cut if there is a fault.
Dec 10, 2006, 02:50 AM
#27
I'm giving examples to show the method, not saying what is too high or too low for your setup.
A disabled fuel cut with a virtually infinitely long timer and unachievable boost limit is bad practice IMHO.
If you are happy with your present boost control, then I suggest you datalog the best measurement of load that you can across the RPM range in the highest gear that it is safe to do so, then set the load values (in all three tables) you log as your targets (smoothing them out, minus whatever you set the offset to).
If you can't achieve these then you need to look at restrictor/actuator/solenoid changes.
A disabled fuel cut with a virtually infinitely long timer and unachievable boost limit is bad practice IMHO.
If you are happy with your present boost control, then I suggest you datalog the best measurement of load that you can across the RPM range in the highest gear that it is safe to do so, then set the load values (in all three tables) you log as your targets (smoothing them out, minus whatever you set the offset to).
If you can't achieve these then you need to look at restrictor/actuator/solenoid changes.
Dec 10, 2006, 02:59 AM
#28
If you want my best guess as an idea:
Leave everything as your last screen dump that you posted, except...
Boost desired engine load 1,2,3: 155 all the way from the bottom to wherever you want to start it tapering - say 5000 RPM? Then about 125 at red line - or whatever your present redline load is minus 100 (because your offset is 100).
Personally, my tune is quite aggressive for pump fuel, but I run a fuel cut of 285, and the actual load I run is about 265 through the midrange, tapering to about 245 at 6000, 230 at red line.
Leave everything as your last screen dump that you posted, except...
Boost desired engine load 1,2,3: 155 all the way from the bottom to wherever you want to start it tapering - say 5000 RPM? Then about 125 at red line - or whatever your present redline load is minus 100 (because your offset is 100).
Personally, my tune is quite aggressive for pump fuel, but I run a fuel cut of 285, and the actual load I run is about 265 through the midrange, tapering to about 245 at 6000, 230 at red line.
