Dead time question

vtmegasquirter · Post by **vtmegasquirter** » Mon Feb 01, 2016 2:13 pm

I have 2 cars running on MS2extra. I was doing some googling on dead times for my injectors. One car has 30lb Bosch 0280155759 injectors and I found a site that said the dead time was .634 @ 14v. The other car has 30lb Bosch 028150945 injectors and the site said their dead time was .259(didn't give any voltage). I've been using the default value of 1.0ms. Do these dead times sound correct? How will it change my set up if I adjust the settings. This is one area I'm pretty vague on. The 2 cars are daily drivers and run pretty well as is. Can anyone comment.
Thanks

slow_hemi6 · Post by **slow_hemi6** » Mon Feb 01, 2016 4:28 pm

The quoted dead time values were not acquired using Megasquirt driver hardware and as such are not necessarily going to be your dead time values. What mS pulsewidth does your engine idle at?

vtmegasquirter · Post by **vtmegasquirter** » Mon Feb 01, 2016 4:59 pm

Thanks for responding. Please refresh my memory on how to calculate the PW.

2swe · Post by **2swe** » Mon Feb 01, 2016 10:46 pm

just look at your TS PW gauge, or datalog...

vtmegasquirter · Post by **vtmegasquirter** » Tue Feb 02, 2016 10:57 am

I checked a couple of logs and the PW at idle seems to vary from 1.85 to 1.95. Running alpha-n with itb's. Would a copy of my msq or a log be helpful?
Thanks

billr · Post by **billr** » Tue Feb 02, 2016 11:18 am

Well, sure! That's the whole purpose of all the big reminders, like this:
:msq:

vtmegasquirter · Post by **vtmegasquirter** » Tue Feb 02, 2016 1:35 pm

Not sure if these will help, but here are my msq and a log file. Any comments and/or suggestions are welcome. Cars are put away for the winter, had to dig out my tuning computer for the files.

kjones6039 · Post by **kjones6039** » Tue Feb 02, 2016 4:16 pm

Haven't seen that gslender firmware in several years! You might consider updating...............

Ken

vtmegasquirter · Post by **vtmegasquirter** » Tue Feb 02, 2016 5:10 pm

Yeah, still using the old firmware. I tried updating about a year and a half ago and I didn't like the way the car ran, so went back to the GSlender. I have a lot of TPS noise and the GSlender firmware seemed to handle it really well. I guess its more like, if it aint broke don't fix it kind of thing. I might try updating again this spring, but I really don't use any of the features that the newer versions handle. But it would be better for support.

billr · Post by **billr** » Tue Feb 02, 2016 7:59 pm

Educate me here: How do you tell what the firmware version is??? When I open an MSQ posted on forums, my TS screen shows my TS version, but advises to "go online for firmware version". I can't do that, of course, since I don't have the controller to connect to...

slow_hemi6 · Post by **slow_hemi6** » Tue Feb 02, 2016 8:23 pm

Might be a little bit out, but with 2mS or more of idle PW it is going to be fairly tolerant of a small dead time error.

slow_hemi6 · Post by **slow_hemi6** » Tue Feb 02, 2016 8:28 pm

billr wrote:Educate me here: How do you tell what the firmware version is??? When I open an MSQ posted on forums, my TS screen shows my TS version, but advises to "go online for firmware version". I can't do that, of course, since I don't have the controller to connect to...

When I opened it up tuner studio did not have the required ini file for it so it asked if I wanted to download MSextra Serial GS28, that is when I noticed but if you go into project properties it will also say the same thing in there for firmware.

kjones6039 · Post by **kjones6039** » Tue Feb 02, 2016 8:51 pm

slow_hemi6 wrote:
billr wrote:Educate me here: How do you tell what the firmware version is??? When I open an MSQ posted on forums, my TS screen shows my TS version, but advises to "go online for firmware version". I can't do that, of course, since I don't have the controller to connect to...
When I opened it up tuner studio did not have the required ini file for it so it asked if I wanted to download MSextra Serial GS28, that is when I noticed but if you go into project properties it will also say the same thing in there for firmware.

Ctrl-P (Project Properties)

Ken

billr · Post by **billr** » Tue Feb 02, 2016 11:08 pm

OK, got it. Thanks.

Post by **jsmcortina** » Wed Feb 03, 2016 12:47 am

billr wrote:Educate me here: How do you tell what the firmware version is??? When I open an MSQ posted on forums, my TS screen shows my TS version, but advises to "go online for firmware version". I can't do that, of course, since I don't have the controller to connect to...

This was discussed recently, TunerStudio knew the firmware version when it saved the MSQ but unfortunately is choosing not to store it.

The text string you may see in Project Properties is NOT the firmware version.

James

racingmini_mtl · Post by **racingmini_mtl** » Wed Feb 03, 2016 9:06 am

jsmcortina wrote:This was discussed recently, TunerStudio knew the firmware version when it saved the MSQ but unfortunately is choosing not to store it.

Actually, it is saved to the msq if the msq is saved while the ECU is online. But if you open the msq offline, TS deletes it.

So you need to open the msq in a text editor as a first thing and check if the firmware version is there. You can then open it in TS to check the different settings.

That's what I suggested Phil should change in the other thread.

Jean

vtmegasquirter · Post by **vtmegasquirter** » Wed Feb 03, 2016 10:06 am

No offense everyone, but seems to me the thread has been high jacked a bit. Can I get any responses to my original question please.
Thanks

Yves · Post by **Yves** » Wed Feb 03, 2016 10:49 am

Only good way to get correct dead times is to do an actual test.

slow_hemi6 · Post by **slow_hemi6** » Wed Feb 03, 2016 6:59 pm

slow_hemi6 wrote:Might be a little bit out, but with 2mS or more of idle PW it is going to be fairly tolerant of a small dead time error.

The old "get it fairly close" way is to double your squirts per cycle. If it gets richer you have too much dead time, If it goes lean not enough, stays pretty much the same you are close. Works best on cars with smooth, stable idles and steady AFR readings. You also can't drive your PW too low either when doing this test.
Other than that it is the full on Dead Time testing with various input voltages and the spreadsheet. Do a search you'll find the info.

kjones6039 · Post by **kjones6039** » Wed Feb 03, 2016 7:20 pm

jsmcortina wrote:
billr wrote:Educate me here: How do you tell what the firmware version is??? When I open an MSQ posted on forums, my TS screen shows my TS version, but advises to "go online for firmware version". I can't do that, of course, since I don't have the controller to connect to...
This was discussed recently, TunerStudio knew the firmware version when it saved the MSQ but unfortunately is choosing not to store it.

The text string you may see in Project Properties is NOT the firmware version.

James

Risking another hijack here..... I extend my most sincere apologies. After all these years I somehow thought that method was accurate! Apparently I was suffering from a terminal case of "optical rectalitis" (can't see while my head is you-know-where)!

Can I use "advanced age" as an affirmative defense?

Ken

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