MS2/Extra 2.0 beta 14 (20071020)
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One easy way to get it close (not perfect, but good enough) is to change the number of squirts, and then adjust the opening time until the AFR is close to what it was previously. There are other effects that will cause this method to be a little off, but not by that much.
When you're done you should be able to change between any number of squirts alternating or simultaneous with little change in AFR.
Ken
When you're done you should be able to change between any number of squirts alternating or simultaneous with little change in AFR.
Ken
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Great success! I had opening time set to 1.30ms. After 5 minutes of adjusting lower and lower until 2sq/cycle and 6sq/cycle's idle AFR matched I landed at 0.73ms for opening time! Almost half the original amount.
Spent a hour retuning VE and I'm all back to normal except off idle throttle response is almost instantaneous and it feels a little more torquier in the midrange.
I'm going to tune the VE map until it's perfect and then start getting serious with EAE. Currently using TPS AE.
Duty cycle max at 76% near redline.
Thanks for the help!
Spent a hour retuning VE and I'm all back to normal except off idle throttle response is almost instantaneous and it feels a little more torquier in the midrange.
I'm going to tune the VE map until it's perfect and then start getting serious with EAE. Currently using TPS AE.
Duty cycle max at 76% near redline.
Thanks for the help!
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What size injectors you run ? what's idle PW and DC ?M52 POWER! wrote: Spent a hour retuning VE and I'm all back to normal except off idle throttle response is almost instantaneous and it feels a little more torquier in the midrange.
Thanks for the help!
are you running 6 alt all the time now ?
Anyways, i got this other ms2/x question.....
early on some people reported comms issues between mt and ms (myself included). was anything done in that department ?
I kinda always had comms issues. eg. i'll always loose coms when trying to burn from spark table screen. maybe it's my usb to serial adapter...
BMW, 1985, E30, 325i, 2-door, 5spd. Lots of custom work. Turbo build in progress: http://www.e30tech.com/forum/showthread.php?t=55733
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One way of doing this is as follows:M52 POWER! wrote:How do I figure out my injector opening time.
Lift the fuel rail with injectors from its position but maintaining the fuel hose connections, place transparent holders under the injectors and use injector test mode (not sure if this is available in MS2/Extra). I started with 1ms and increased the pw by 0.05ms until I could see positive small amounts of fuel dribbling from the injectors. This is a rather dangerous operation though, as I did have one injector popping off the fuel rail with the full force of the fuel pump then squirting fuel out the rail - not a good time to have an ignition source nearby.
Interesting thing was that although all the injectors had the same Bosch part no, one started opening at 1.25ms while most opened around 1.4ms and some were slower. These differences in opening times must surely result in differences between different cylinders - with these differences increasing the more squirts per cycle one implement.
To me this is another important reason for sequential - to be able to have more uniform AFRs accross the various cylinders, for smoother running.
Kind regards
Philip
'74 Jensen Interceptor 440ci (EFI'ed with MS2 and wasted spark + GM 4L60e GPIO controlled - both on Extra FW)
Philip
'74 Jensen Interceptor 440ci (EFI'ed with MS2 and wasted spark + GM 4L60e GPIO controlled - both on Extra FW)
That is correct....
in my limited testing of fuel injectors, with ms in test mode, I found that a set of injectors flows the same at long pw's, however on very short pw's they might be non linear. it is commonly described that they all flow a bit differently, however my data shows that they all flow the same, however opening/closing time vary within few 0.01ms's therefore at low pw's (very close to opening time) they might appear to flow differently.
in my limited testing of fuel injectors, with ms in test mode, I found that a set of injectors flows the same at long pw's, however on very short pw's they might be non linear. it is commonly described that they all flow a bit differently, however my data shows that they all flow the same, however opening/closing time vary within few 0.01ms's therefore at low pw's (very close to opening time) they might appear to flow differently.
BMW, 1985, E30, 325i, 2-door, 5spd. Lots of custom work. Turbo build in progress: http://www.e30tech.com/forum/showthread.php?t=55733
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Ken,muythaibxr wrote:IF your injectors are too big or too small then you won't be able to just go to the maximum number of squirts for your engine so I added the lag compensation feature, which automatically goes to the maximum number of squirts for your engine when tpsdot or mapdot go over a certain threshold, then goes back to the normal number of squirts otherwise.
I also have some other features in mind to help throttle response, such as if you're mid-squirt when an accel event occurs, extend that squirt to the new value so that cylinders on those injectors will get close to the right amount of fuel that much sooner. I also plan on doing some MAP prediction using manifold volume, engine volume and throttle position along with an Alpha-N table (tuned properly). This should also help throttle response on certain engines.
Ken
I know that I'm not real well educated on this stuff, but I am constantly amazed by the work you and James have done on this code. Simply amazing! ! !
Thanks!
Thad
here's another thing.
AFAIK, durning acceleration, engine could take more timing than normally. there could be an option that allows us to set extra, additional advance on ae event. i think that would greatly help low rpm response.
AFAIK, durning acceleration, engine could take more timing than normally. there could be an option that allows us to set extra, additional advance on ae event. i think that would greatly help low rpm response.
BMW, 1985, E30, 325i, 2-door, 5spd. Lots of custom work. Turbo build in progress: http://www.e30tech.com/forum/showthread.php?t=55733
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Yeah, and I remember a request to define more timing based on rate of RPM rise. Because you can get away with more timing advance in lower gears/lower load situations, then you can in higher gear/towing/high load situations. Some of the stock ECM's do this (Ford comes to mind), and I've noticed the need for it when trying to tune some of my cars to the edge.. I get away with more timing until I go to climb a very steep hill, especially if I don't bother to downshift.mops wrote:here's another thing.
AFAIK, durning acceleration, engine could take more timing than normally. there could be an option that allows us to set extra, additional advance on ae event. i think that would greatly help low rpm response.
Brian
'84 Dodge Rampage
'84 Dodge Rampage
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I can not do these commands from MegaTune to log the communications (or I don't know how). I am sending the commands from VB6.0 and have no way to log the serial outputs.jsmcortina wrote:Could you post an annotated comm.log of what you describe.woh wrote: When I get a table (e.g.VE1) using the 'r' command no data is returned (0 bytes) when I first go to a new page. After the first time it always works even if the table changes (but not the page). Is that a bug? Or am I expected to add a delay after the first three bytes of the command every time I change the page? It works fine with a delay after the first three bytes. I'd like to see the firmware keep track of page changes and add a delay. That would make the command definition much cleaner.
The command (VE table 1) is 'r' 0 9 0 0 1 0 where each digit is a byte. If I send it this way the and there is a page change I get no data back. If I put a delay of 100ms between byte 3 and 4 it works fine. After sending the page change once it works ok.
The VB code looks like this and does not work the first time it changes the page. In this code I sent all the bytes immediately
Code: Select all
ReDim byteArray(6)
' Select a page
byteArray(0) = Asc("r")
byteArray(1) = 0
byteArray(2) = 9
' Table starting point
byteArray(3) = 0
byteArray(4) = 0
' Set size (in bytes) of table data
byteArray(5) = 1
byteArray(6) = 0
' Send the commands to get a page and return the variables
io.Output = byteArray
delay 500
' grab data from comm port.
DataIn = io.Input
Code: Select all
ReDim byteArray(3)
' Select a page
byteArray(0) = Asc("r")
byteArray(1) = 0
byteArray(2) = 9
io.Output = byteArray
delay 200
ReDim byteArray(3)
byteArray(0) = 0
byteArray(1) = 0
byteArray(2) = 1
byteArray(3) = 0
' Send the commands to get a page and return the variables
io.Output = byteArray
delay 500
' grab data from comm port.
DataIn = io.Input
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That makes sense. When the page changes the code copies the flash data into ram. This takes a finite time.woh wrote: This VB6.0 code works every time. Here thete is a pause between the third and 4th byte
I am assuming that with 115200 comms the next character may get dropped in this time period.
Megatune implements a delay between bytes.
James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Little OT.woh wrote: Stra cut...
This VB6.0 code works every time. Here thete is a pause between the third and 4th byte
Code: Select all
ReDim byteArray(3) ' Select a page byteArray(0) = Asc("r") byteArray(1) = 0 byteArray(2) = 9 io.Output = byteArray delay 200 ReDim byteArray(3) byteArray(0) = 0 byteArray(1) = 0 byteArray(2) = 1 byteArray(3) = 0 ' Send the commands to get a page and return the variables io.Output = byteArray delay 500 ' grab data from comm port. DataIn = io.Input
With VB6 you can quikly initialyze an array:
ReDim byteArray(3)
byteArray() = Array(Asc("r"), 0, 9)
And probably on the first redim, you have missed that you have filled it from 0 to 2, but it's length is 3, one byte is left 'unfilled'
Enrico
Opel/Vauxhall Corsa GSi MS2
Subaru v4 EJ20 MS3
Opel/Vauxhall Corsa GSi MS2
Subaru v4 EJ20 MS3