Jump to content

Mapdot or tpsdot megasquirt


Recommended Posts

TPS is far easier to set up and tune.

 

Proven settings for a Starquest, accel time 0.7 sec, TPS threshold about 1, start with Don't Decay, stagger your enrichments from a low of 0.5 mS just over the threshold to a max of 2.0 mS at the highest rate of change, maybe 2.4 if you really like to plant your foot (Tye style). Biggest mistake most make is too much fuel for too long, that applies to MAPdot as well as TPSdot.

Edited by scott87star
  • Like 2
Link to comment
Share on other sites

TPS is far easier to set up and tune.

 

Proven settings for a Starquest, accel time 0.7 sec, TPS threshold about 1, start with Don't Decay, stagger your enrichments from a low of 0.5 mS just over the threshold to a max of 2.0 mS at the highest rate of change, maybe 2.4 if you really like to plant your foot (Tye style). Biggest mistake most make is too much fuel for too long.

WWhat volts should I use? I'm ms1 so i have to choose volts not percent

 

Edit

BBtw I'm on a mustang 65mm tb

Edited by Skullzaflare
Link to comment
Share on other sites

You want your tpsdot and map dot to be high enough so that it doesn't trip while your foot is off the throttle but not too high that it's not triggering with your rate of pedal movement. These are thresholds and if there is any activity below these values there will be no acceleration enrichment. It is imperative that you have no electrical noise on the TPS wires or any vacuum leaks for the mapdot. You can test the voltage and map change rate through a datalog and then set your threshold based on when accelaration enrichment is triggering.

 

A side note would be that if you really want to dial in your fuel table you'll set your mapdot and tpsdot thresholds so high you'll never reach them and then go for a drive and slowly accelerate and hold at a certain rpms and adjust the fuel so that it's in your target air/fuel ratio. A common problem is that people will use acceleration enrichment settings to compensate for a poorly tuned fuel table. You have to run the engine with no o2 or acceleration adjustments so you can dial in the base fuel table. The adjustments are meant for fine tuning, not for making huge adjustments in required fuel. Once you have a good base fuel table, you'd be surprised how easy it is to setup the acceleration enrichment bins because you'll be able to tell right away if it's dumping in too much or too little fuel for the rate of throttle since you know that the intersection on your fuel table has a perfect fuel ratio without adjustments.

 

I highly recommend purchasing the full version of tunerstudio and using autotune to get your fuel tables setup. As long as the car idles it will help dial in the fuel table automatically to the desired air/fuel ratio target. It smoothed out my fuel table tremendously.

 

sorry for the long winded reply....

Edited by CaliConquestAlex
Link to comment
Share on other sites

You want your tpsdot and map dot to be high enough so that it doesn't trip while your foot is off the throttle but not too high that it's not triggering with your rate of pedal movement. These are thresholds and if there is any activity below these values there will be no acceleration enrichment. It is imperative that you have no electrical noise on the TPS wires or any vacuum leaks for the mapdot. You can test the voltage and map change rate through a datalog and then set your threshold based on when accelaration enrichment is triggering.

 

A side note would be that if you really want to dial in your fuel table you'll set your mapdot and tpsdot thresholds so high you'll never reach them and then go for a drive and slowly accelerate and hold at a certain rpms and adjust the fuel so that it's in your target air/fuel ratio. A common problem is that people will use acceleration enrichment settings to compensate for a poorly tuned fuel table. You have to run the engine with no o2 or acceleration adjustments so you can dial in the base fuel table. The adjustments are meant for fine tuning, not for making huge adjustments in required fuel. Once you have a good base fuel table, you'd be surprised how easy it is to setup the acceleration enrichment bins because you'll be able to tell right away if it's dumping in too much or too little fuel for the rate of throttle since you know that the intersection on your fuel table has a perfect fuel ratio without adjustments.

 

I highly recommend purchasing the full version of tunerstudio and using autotune to get your fuel tables setup. As long as the car idles it will help dial in the fuel table automatically to the desired air/fuel ratio target. It smoothed out my fuel table tremendously.

 

sorry for the long winded reply....

i already have the full mega and tuner

my VE is good, however reving and taking off, and a giving it gas off decel, sharpy leans then comes back

http://i15.photobucket.com/albums/a381/skullzaflare/Untitled_zps242f6f73.jpg

Link to comment
Share on other sites

You should have the acceleration time set somewhere between 0.7 and 1.0. Sometimes a quick lean condition actually indicates it's getting too much fuel. Try leaning it out some and seeing if that helps. Without seeing a log showing the range of your tps dot minimums and maximums, it's hard to say which bin is activating and causing you trouble. You can post a snapshot of a log showing the tpsdot and the AE bins when trying to rev and perhaps some analysis will be given.
Link to comment
Share on other sites

your required fuel seems very high. I'm running similarly sized injectors and my req fuel is only set to 6.0 with an injector opening time of 1.1ms.

i have it set like that, i had a hard time being able to idle below 1000 otherwise

Link to comment
Share on other sites

You will have to adjust the idle set screw on the throttle body itself to set your base idle. The idea is to set your required fuel to an appropriate level and then tune around that because it's used as a multiple for all fuel enrichment calculations. There should be a set screw on your throttle body that you can use to sdjust where the throttle plate returns to. I just threaded two 8mm nuts onto mine and I can adjust it up or down depending on the tuning. Also, note that cold idle versus warm idle will vary if you don't have an idle air valve setup. For me, my car idles cold around 850-900 rpm and when it's warmed up it idles around 1100 rpm. If I try to decrease the cold idle rpm to compensate the car will die and not stay running. I know there are other options in terms of cold spark advance that can help supplement, but I haven't messed with that yet.
Link to comment
Share on other sites

You will have to adjust the idle set screw on the throttle body itself to set your base idle. The idea is to set your required fuel to an appropriate level and then tune around that because it's used as a multiple for all fuel enrichment calculations. There should be a set screw on your throttle body that you can use to sdjust where the throttle plate returns to. I just threaded two 8mm nuts onto mine and I can adjust it up or down depending on the tuning. Also, note that cold idle versus warm idle will vary if you don't have an idle air valve setup. For me, my car idles cold around 850-900 rpm and when it's warmed up it idles around 1100 rpm. If I try to decrease the cold idle rpm to compensate the car will die and not stay running. I know there are other options in terms of cold spark advance that can help supplement, but I haven't messed with that yet.

there was no way to get it to idle hot below 1000, simply turning the screw it would die...

i fixed that with this, my afr's are good to the tip.

i added a ford IAC yesterday, still tinking with it, however i have it idling at 800-850 warm, and 1100-1500 cold (still bouncing havent solved that yet)

Link to comment
Share on other sites

  • 3 weeks later...

 

i already have the full mega and tuner

my VE is good, however reving and taking off, and a giving it gas off decel, sharpy leans then comes back

http://i15.photobucket.com/albums/a381/skullzaflare/Untitled_zps242f6f73.jpg

 

what didyou end up using for voltage rate? i always wondered about this setting

Link to comment
Share on other sites

Ya, there should be a way to convert from %/s to v/s. The range on a throttle body is 0v to 5v right? Maybe it's as simple as:

65% * 5v = 3.25v

115% * 5v = 5.75v

190% * 5v = 9.5v

400% * 5v = 20v

 

One thing i came across today is a way to log the accel enrichment, looks towards last post..

http://www.msextra.c...p?f=100&t=51192

 

Basically you add this to the .ini file.

entry = accelEnrich, "AccEnrmS", float, "%.2f"

 

Not sure if this is available in MS1.

 

But i just went for a quick drive and it appears to log this information.

post-4330-0-58324900-1397611206_thumb.png

 

I just noticed your accel time is 0.0? I found going from 0.2 up to 0.7 made a noticeable difference. I'm at 0.9 now, but i'll go to 0.8 soon based on looking at the log file, my afr go towards the rich side more then i need to after an AE event.

Edited by jisleyjr
Link to comment
Share on other sites

Ya, there should be a way to convert from %/s to v/s. The range on a throttle body is 0v to 5v right? Maybe it's as simple as:

65% * 5v = 3.25v

115% * 5v = 5.75v

190% * 5v = 9.5v

400% * 5v = 20v

 

One thing i came across today is a way to log the accel enrichment, looks towards last post..

http://www.msextra.c...p?f=100&t=51192

 

Basically you add this to the .ini file.

entry = accelEnrich, "AccEnrmS", float, "%.2f"

 

Not sure if this is available in MS1.

 

But i just went for a quick drive and it appears to log this information.

post-4330-0-58324900-1397611206_thumb.png

 

I just noticed your accel time is 0.0? I found going from 0.2 up to 0.7 made a noticeable difference. I'm at 0.9 now, but i'll go to 0.8 soon based on looking at the log file, my afr go towards the rich side more then i need to after an AE event.

 

where do you edit the file?

 

Link to comment
Share on other sites

where do you edit the file?

There should be a folder called projectCfg where your .msq files are at, in there is a mainController.ini file.

 

Look for a section like:

 

;-------------------------------------------------------------------------------

;-- The entries are saved in the datalog file in the order in which they --

;-- appear in the list below. --

;-- --

;-- Channel - Case sensitive name of output channel to be logged. --

;-- Label - String written to header line of log. Be careful --

;-- about changing these, as programs like MSLVV and --

;-- MSTweak key off specific column names. --

;-- Type - Data type of output, converted before writing. --

;-- Format - C-style output format of data. --

 

[Datalog]

; Channel Label Type Format

; -------------- ---------- ----- ------

entry = time, "Time", float, "%.3f"

entry = seconds, "SecL", int, "%d"

entry = rpm, "RPM", int, "%d"

entry = map, "MAP", float, "%.1f"

entry = throttle, "TP", int, "%d"

 

I just added a line at the bottom:

 

entry = vetrim3curr, "VE Trim 3", float, "%.1f"

entry = vetrim4curr, "VE Trim 4", float, "%.1f"

entry = rpmdot, "RPMdot", int, "%d"

entry = accelEnrich, "AccEnrmS", float, "%.2f"

 

;-------------------------------------------------------------------------------

Edited by jisleyjr
Link to comment
Share on other sites

can you enlighten me how to figure it out with tpsdot and mapp? please soon as i finsih my water pump i will try that log ini file

 

So for example if you have a tpddot of 150% in the log and in the AE configuration you have the 2 points of 125% = 1.0 and 175% = 2.0. You'll need to find the slope of the line (rise over run) between the 2 configuration points (the rise is 2.0 - 1.0 = 1.0, the run is 175% - 125% = 50%, so 1.0 / .50 = 2.0 for the slope. Take the slope times the difference between 125% and 150% and you get 2.0 * .25 = .5. Take .5 add onto the 1.0

So the AE value at a tpsdot of 150% = 1.5ms.

 

This is why i'd rather log it.

Link to comment
Share on other sites

 Share

×
×
  • Create New...