My "new" data acq system
08-15-2009, 02:54 PM
#21
Safety Car
08-17-2009, 01:30 AM
#23
Safety Car
Just a little plug for Jeff at Optimum Motorsports <jeff@optimummotorsports.com> for taking the time to respond to emails while racing at Mid Ohio this weekend. He's been awesome at responding with a tonne of information on the AiM products.
http://www.optimummotorsports.com/
Talking with him about the MXL Pista, vs MXL Pro'05, vs Evo4+MC3, vs SmartyCam... learned the SmartyCam can be used to provide GPS to an MXL -and- the SmartyCam gets access to all the MXL sensors. Or the SmartyCam can connect directly to the OBDII/CAN on the C6 and you can put that info on the video.
Also learned AiM has a Channel Expansion now that lets you add both speed and analog channels to all their offerings. But those channels are limited to 100Hz sampling so you can expand an Evo4 or Pista to Pro'05 levels.
I still have no idea which way to go, complicated largely by wanting to be able to move the unit(s) between my RX7 and the C6... predictive lap times require an MXL which needs to be mounted "properly" and would very much like the GPS add-on.
http://www.optimummotorsports.com/
Talking with him about the MXL Pista, vs MXL Pro'05, vs Evo4+MC3, vs SmartyCam... learned the SmartyCam can be used to provide GPS to an MXL -and- the SmartyCam gets access to all the MXL sensors. Or the SmartyCam can connect directly to the OBDII/CAN on the C6 and you can put that info on the video.
Also learned AiM has a Channel Expansion now that lets you add both speed and analog channels to all their offerings. But those channels are limited to 100Hz sampling so you can expand an Evo4 or Pista to Pro'05 levels.
I still have no idea which way to go, complicated largely by wanting to be able to move the unit(s) between my RX7 and the C6... predictive lap times require an MXL which needs to be mounted "properly" and would very much like the GPS add-on.
08-17-2009, 02:59 PM
#24
Intermediate
Member Since: Dec 2003
Location: Baltic CT
Posts: 48
Likes: 0
Received 0 Likes
on
0 Posts
When you do something like this with the EVO4+MyChron3 can you combine the data from both the EVO4 and the MyChron? Can you combine the 2 wheel speed sensors on the EVO4 with the 2 wheel speed sensors on the XG LOG? Or use the "other" 5 analog inputs as an expansion module? That would be a very cool way to get GPS plus a tonne of inputs for $1139+$949 which is barely more than an MXL Pista @ $1999 and less than a Pro @ $2499.
It's hard to tell from their website; it's clear the EVO4 can connect to the MyChron or SmartyCam, but just not clear if the datalogger gets all the inputs.
It's hard to tell from their website; it's clear the EVO4 can connect to the MyChron or SmartyCam, but just not clear if the datalogger gets all the inputs.
08-17-2009, 03:10 PM
#25
Safety Car
Yessir. Looks like $1399 for the EVO4+MyChron3 Dash. I did get somewhat warned away from it if I was looking to make it the sole instrument in the car because it can only show 2 channels on 2 pages, so 4 channels total on the dash.
A couple of folks are really pushing the MXL Pista plus some expansion for me...
A couple of folks are really pushing the MXL Pista plus some expansion for me...
08-18-2009, 04:10 PM
#26
Safety Car
You're an expensive friend to have, Mr. Hoffman. I'm about to be invoiced for an AiM Pista dash, GPS module, and extra harness. That should give me a sweet set up in the RX7 -or- the C6. This, of course, also meant for ease of installation it would be good to upgrade the ECU in the RX7 since the one in it was handset programming only and 10+ years old now. State of the art ECUs now include boost control, traction control, anti-lag for the turbo, and more tuning tricks than you would imagine (auto-tuning based on UEGO, EGT, etc!)...
08-18-2009, 09:59 PM
#28
Le Mans Master
Thread Starter
Member Since: Feb 2000
Location: Bedford NH
Posts: 5,708
Likes: 0
Received 1 Like
on
1 Post
Cruise-In II Veteran
I just thought of something, monitoring the wheel speed encoders will give you indication if the wheel bearings are going bad. It should show an erratic speed when it is on it's way out.
08-25-2009, 06:00 PM
#29
Safety Car
Not as super-duper as Gary's, but the guys did a great job on the install... should move pretty easily between my two cars. It obscures the DIC but seems more than a reasonable replacement for it. We'll see how it works out at Thunderhill on Friday. It did well with the calculated gears and GPS based speed on the drive home. One thing I did notice is that the OBDII/CAN connection doesn't provide oil temperature, but a simple analog sender should take care of that -- is there a good place to add one? Hopefully it looks "good enough" when out of the car and in the other one...
08-25-2009, 06:37 PM
#30
Racer
Member Since: Jun 2008
Location: Phoenix (formerly Ontario Canada) AZ
Posts: 338
Likes: 0
Received 1 Like
on
1 Post
Gary,
Is the OBDII port really fast enough to communicate the amount of real time data needed for proper data acquisition?
Also some parameters are not available (FP etc.) either
I have found it much too slow for my liking but would like your opinion
Thanks!
Is the OBDII port really fast enough to communicate the amount of real time data needed for proper data acquisition?
Also some parameters are not available (FP etc.) either
I have found it much too slow for my liking but would like your opinion
Thanks!
08-25-2009, 07:14 PM
#32
Le Mans Master
Thread Starter
Member Since: Feb 2000
Location: Bedford NH
Posts: 5,708
Likes: 0
Received 1 Like
on
1 Post
Cruise-In II Veteran
Yes, but I am not using the capabilities of the MXL Pro05 in the C6Z, that is for the other car. Do you have any other pics of the mount they made for you?
08-25-2009, 07:36 PM
#33
Le Mans Master
Thread Starter
Member Since: Feb 2000
Location: Bedford NH
Posts: 5,708
Likes: 0
Received 1 Like
on
1 Post
Cruise-In II Veteran
In an '06 and up, it is OK. I think the max is 10Hz, and some things like fuel used I have set for 1 Hz. It is not perfect, but it is pretty damn good. It is good enough for brake testing to see if, for example, the ABS is active during brake testing. It is certainly better to say that yes, the bias with the new AP DTM rear calipers is balanced, and here is the wheel speed encoder data and here are the histograms to prove it rather than, "hey trust me, they feel great"!
08-25-2009, 07:37 PM
#34
08-25-2009, 07:42 PM
#36
Safety Car
It's a pretty simple aluminum bracket with rubber stand offs to deal with vibrations. They mounted three little studs through the plastic steering column cover so I can just take the three nuts off and disconnect the harness from it when I want to swap it between cars.
08-26-2009, 02:30 PM
#37
Safety Car
Hey Gary, do you get any data on GMX_ACC? My min/max there is 0. I'm also trying to figure out what threshold to set for the warning lights for oil pressure and water temperature. When the car is warmed up from street driving I'm see down as low as 23.9# on oil pressure.
08-26-2009, 05:24 PM
#39
Safety Car
Okay, I feel better than I'm also down around 25# at idle now.
I think anybody with Race Studio2 should be able to view them. Joe (@ tcdesignfab.com) mentioned there are three files under \Program Files\AIM\Data\*.* ... it's drk, gpk and rrk files. I think all we need to do is send those around and they're self-contained. Not sure about the dash configuration, but those should be the data files.
I think anybody with Race Studio2 should be able to view them. Joe (@ tcdesignfab.com) mentioned there are three files under \Program Files\AIM\Data\*.* ... it's drk, gpk and rrk files. I think all we need to do is send those around and they're self-contained. Not sure about the dash configuration, but those should be the data files.