Autotap giving bad (spiking) data
Thread Starter
Teching In
Joined: Apr 2003
Posts: 9
Likes: 0
From: Tucson, AZ
Autotap giving bad (spiking) data I have a bi-directional autotap cable (non-usb) and it's pretty much always given me bad data. Not every parameter does this but a lot of them will spike the data every couple of seconds... for example the KR or LTFT's will go from a normal value to something outrageous (like +50) for one frame of data and then drop back... it'll happen every couple of seconds and makes analyzing the data and looking at graphs VERY difficult. I've sent it back to the manufacturer several times and they've never found anything wrong with it. Strange thing though, when using the EFILIVE demo that lets me log 5 seconds of data I NEVER EVER get a spike in the data... even recording like 50 5 second samples in a row... Yes I've downloaded the latest ATAP version... (this has happened for at least 3 revisions) and it's never gone away... Anybody have any ideas or have this happen before???? Thanks!
'01 GMC Sierra C3
6.0 AWD
'01 GMC Sierra C3
6.0 AWD
Teching In
Joined: Apr 2004
Posts: 25
Likes: 0
From: motor city
i just bought atap resently and mine does the exact same thing. it will iether spike up or down. my buddy has efi live and his has no problems. i also tried logging with efi live on mine for 5 sec. and no problems. the other thing i am very dissapointed with is how slow atap is. my buddys efi live can record like 20 things at once. with atap anything over 3 is to many. anything over three is like playing a good video game with a shitty video card.
Thread Starter
Teching In
Joined: Apr 2003
Posts: 9
Likes: 0
From: Tucson, AZ
Yup, mine is the V2 serial interface and I've noticed I get about 3-4 times the refresh rate out of EFI live using the same cable than I do with atap... And EFI live never spikes... crappy software...
Originally Posted by 500plus
my buddys efi live is serial so evidently the bottle neck is not at the serial. i thing its just the software.
The bottleneck is neither in the PC, nor the the cable nor the the software.
The major factor that determines how fast you can log data is the scan mode that is used. There are basically three different ways to scan data from an OBD II PCM.
1. One PID at a time which is supported on ALL OBDII vehicles. So scan tools that support multiple manufacturers and vehicles will usually use that method. It is the slowest method. EFILive can be configured to use this scan mode so that it can scan non-LS1 vehicles.
2. Up to 6 PIDs at a time. This method is supported on *most* OBDII vehicles but may be implemented differently by different manufacturer's. It is obviously about 6 times faster than the first method. EFILive fully supports this scan mode.
3. Up to 24 PIDs at a time. This method is supported by the LS1 PCM and is the fastest way to log data from that PCM. EFILive fully supports this scan mode.
So it's not really fair to compare cables, PC's and software because it is the scanning method that determines the data logging speed.
Regards
Paul
The major factor that determines how fast you can log data is the scan mode that is used. There are basically three different ways to scan data from an OBD II PCM.
1. One PID at a time which is supported on ALL OBDII vehicles. So scan tools that support multiple manufacturers and vehicles will usually use that method. It is the slowest method. EFILive can be configured to use this scan mode so that it can scan non-LS1 vehicles.
2. Up to 6 PIDs at a time. This method is supported on *most* OBDII vehicles but may be implemented differently by different manufacturer's. It is obviously about 6 times faster than the first method. EFILive fully supports this scan mode.
3. Up to 24 PIDs at a time. This method is supported by the LS1 PCM and is the fastest way to log data from that PCM. EFILive fully supports this scan mode.
So it's not really fair to compare cables, PC's and software because it is the scanning method that determines the data logging speed.
Regards
Paul
Thread Starter
Teching In
Joined: Apr 2003
Posts: 9
Likes: 0
From: Tucson, AZ
Well how can you say it's not fair to compare software when it's the software that controls the scanning method? I can find no way in autotap to alter the method that it scans... if you can point me in the right direction I would be eternally greatfull...
Originally Posted by EFIliveV5
The bottleneck is neither in the PC, nor the the cable nor the the software.
The major factor that determines how fast you can log data is the scan mode that is used. There are basically three different ways to scan data from an OBD II PCM.
1. One PID at a time which is supported on ALL OBDII vehicles. So scan tools that support multiple manufacturers and vehicles will usually use that method. It is the slowest method. EFILive can be configured to use this scan mode so that it can scan non-LS1 vehicles.
2. Up to 6 PIDs at a time. This method is supported on *most* OBDII vehicles but may be implemented differently by different manufacturer's. It is obviously about 6 times faster than the first method. EFILive fully supports this scan mode.
3. Up to 24 PIDs at a time. This method is supported by the LS1 PCM and is the fastest way to log data from that PCM. EFILive fully supports this scan mode.
So it's not really fair to compare cables, PC's and software because it is the scanning method that determines the data logging speed.
Regards
Paul
The major factor that determines how fast you can log data is the scan mode that is used. There are basically three different ways to scan data from an OBD II PCM.
1. One PID at a time which is supported on ALL OBDII vehicles. So scan tools that support multiple manufacturers and vehicles will usually use that method. It is the slowest method. EFILive can be configured to use this scan mode so that it can scan non-LS1 vehicles.
2. Up to 6 PIDs at a time. This method is supported on *most* OBDII vehicles but may be implemented differently by different manufacturer's. It is obviously about 6 times faster than the first method. EFILive fully supports this scan mode.
3. Up to 24 PIDs at a time. This method is supported by the LS1 PCM and is the fastest way to log data from that PCM. EFILive fully supports this scan mode.
So it's not really fair to compare cables, PC's and software because it is the scanning method that determines the data logging speed.
Regards
Paul
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Originally Posted by EskimoPie
Well how can you say it's not fair to compare software when it's the software that controls the scanning method? I can find no way in autotap to alter the method that it scans... if you can point me in the right direction I would be eternally greatfull...
Technically you're right, the scan mode and hence the scan speed is determined by the software. What I actually meant was the "speed of execution" of the PC/software itself is not the bottle neck. So it is not really fair to make comparisons about which software "runs faster".
There is no way (that I know of) to change the scan method in AutoTap.
Regards
Paul
Originally Posted by 500plus
so your telling me to get efilive. thanks paul.
you said there is a way to get evilive to work on other vehicles.
very interested
you said there is a way to get evilive to work on other vehicles.
very interested
As a generic scanner (on non-LS1/LS6 vehicles) EFILive only has access to generic PIDs and the EPA information.
The parts of EFILive that are specific to LS1/LS6 are:
- enhanced PIDs
- bi-directional controls
- high speed data.
GM may have implemented the high speed data on other models - I don't know.
Regards
Paul
