When I look at the datalog, it shows high values for TpsDot. The max threshold is 255 %/s in megatune, but the values in the datalog shows about 1200 max. I use ms2 with 2.905 code and a ford tps (2.9I v6 '92) .
How can i change the TpsDot to normal?
High TPSdot values
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Bernard Fife
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Re: High TPSdot values
Janse,
There was a 1-0x correction in the TPSdot scaling a while ago: viewtopic.php?f=31&t=38811&p=231128&hil ... ot#p231121.
However, MegaTune hasn't been updated in years, and likely never will be. I can't recall if the 255%/sec value is hard-coded in MT (which I haven't used in quite a while), but if it is, you are stuck unless you move to TunerStudio.
Lance.
There was a 1-0x correction in the TPSdot scaling a while ago: viewtopic.php?f=31&t=38811&p=231128&hil ... ot#p231121.
However, MegaTune hasn't been updated in years, and likely never will be. I can't recall if the 255%/sec value is hard-coded in MT (which I haven't used in quite a while), but if it is, you are stuck unless you move to TunerStudio.
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw
Re: High TPSdot values
I use Tunerstudio. Also with Tunerstudio i can't use larger values then 255 (if i place 256 it will change to 0 automatically). How can i change this?
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kjones6039
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Re: High TPSdot values
Janse wrote:The max threshold is 255 %/s in megatune
Which is it ???Janse wrote:I use Tunerstudio
In TS I can set it to whatever I like. (ie. 300, 500, etc.)
Perhaps this is a B&G thing?
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
Re: High TPSdot values
Its TS MS Lite v1.004 and code 2.905 (on MS2). It isn't possible to change the threshold:kjones6039 wrote:Janse wrote:The max threshold is 255 %/s in megatuneWhich is it ???Janse wrote:I use Tunerstudio
http://youtu.be/eeS_0MnADDI
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kjones6039
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Re: High TPSdot values
Yep, I see what you mean.Janse wrote:Its TS MS Lite v1.004 and code 2.905 (on MS2). It isn't possible to change the threshold:
I would like to try it myself, except I can't seem to find the B&G 2.905 code you are referring to. I did try it with the 2.89 code and got the same results as you did. I suspect this is associated with the B&G code. It works fine for me using Extra code.
Let's see what the experts say.
Sorry I couldn't be of more help.
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
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Bernard Fife
- Master Squirter
- Posts: 475
- Joined: Thu Oct 29, 2009 12:54 pm
Re: High TPSdot values
Janse,
The code limits the TPS theshold to the range 0 to 255%/sec (programmers will recognize this as an 8-bit 'unsigned char'). That means opening the throttle in less than 0.4 of a second, which is pretty fast. You may see faster rises than that in the log, but it's likely as much due to noise as to actual TPS movement. If the TPSdot is greater than 255%/sec, then the top pulse width bin is used. So you can tune the top bin for your highest TPSdot's, if you wish.
If it were mine, though, I would adjust the TPS lag factor lower to remove as much of the noise as I could.
The MAP signal reacts faster to opening the throttle, but is similarly limited to 0 to 255 kPa/sec.
However, you shouldn't tune by the peak values you see in a datalog, but rather by the response you get from the engine. The best way to do this is by 'winging' then engine in neutral while stopped and adjust the accel pulse widths and bins to get the cleanest, fastest engine response. There is more on this in the manual.
If you need very fast accel enrichment, the best bet is to use X-Tau, which corrects the fuel pulse widths in real time, not after the fact. There is more on X-Tau here: http://www.megamanual.com/ms2/xtau.htm
Lance.
The code limits the TPS theshold to the range 0 to 255%/sec (programmers will recognize this as an 8-bit 'unsigned char'). That means opening the throttle in less than 0.4 of a second, which is pretty fast. You may see faster rises than that in the log, but it's likely as much due to noise as to actual TPS movement. If the TPSdot is greater than 255%/sec, then the top pulse width bin is used. So you can tune the top bin for your highest TPSdot's, if you wish.
If it were mine, though, I would adjust the TPS lag factor lower to remove as much of the noise as I could.
The MAP signal reacts faster to opening the throttle, but is similarly limited to 0 to 255 kPa/sec.
However, you shouldn't tune by the peak values you see in a datalog, but rather by the response you get from the engine. The best way to do this is by 'winging' then engine in neutral while stopped and adjust the accel pulse widths and bins to get the cleanest, fastest engine response. There is more on this in the manual.
If you need very fast accel enrichment, the best bet is to use X-Tau, which corrects the fuel pulse widths in real time, not after the fact. There is more on X-Tau here: http://www.megamanual.com/ms2/xtau.htm
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw
Re: High TPSdot values
Thx for the help!kjones6039 wrote:
Sorry I couldn't be of more help.
Is it possible to have noise when the engine isn't running? Ive made this log (attached) while the engine was not running. You can see how fast i move the throttle right here:Lance wrote:Janse,
If it were mine, though, I would adjust the TPS lag factor lower to remove as much of the noise as I could.
http://youtu.be/085Mva5N3Ec