Greddy turbo AFR using CANscan
05-27-2005, 07:22 PM
#1
Ex- member.
Thread Starter
Greddy turbo AFR using CANscan
I finally received my Canscan and it works pretty good. I did have to reboot once for it to connect.
Couple of things.....
- The AFR is correct and doesn't need to be adjusted (read a post about having to add a certain value so it'll be correct. Dan verified it was accurate.)
- It's in full scale and not half scale like the earlier versions that came out.
Does anybody know if the sample rate can be set to less than 0.100 sec?
Here's my Greddy turbo w/ Mazdamaniacs 050505map.
EDIT: Changed the target AFR to the 12.0-12.5 range for Turbo. It's running lean in the 5-7k rpms and at redline. I'm not getting any detonation/ knocking so I may leave it alone.
Couple of things.....
- The AFR is correct and doesn't need to be adjusted (read a post about having to add a certain value so it'll be correct. Dan verified it was accurate.)
- It's in full scale and not half scale like the earlier versions that came out.
Does anybody know if the sample rate can be set to less than 0.100 sec?
Here's my Greddy turbo w/ Mazdamaniacs 050505map.
EDIT: Changed the target AFR to the 12.0-12.5 range for Turbo. It's running lean in the 5-7k rpms and at redline. I'm not getting any detonation/ knocking so I may leave it alone.
Last edited by adrian-1; 05-28-2005 at 12:04 PM.
05-27-2005, 09:04 PM
#3
$170 for the basic USB CANScan Windoze setup
the Enhanced Data Viewer "be the dealer" software is coming soon, I have a beta version, it's pretty cool
http://www.obdscan.net/
the Enhanced Data Viewer "be the dealer" software is coming soon, I have a beta version, it's pretty cool
http://www.obdscan.net/
05-27-2005, 09:12 PM
#4
Wow, that's a better version than mine. (I have 3.60) Sorry I cannot answer your question about the sample rate, but there are things you could do to the spreadsheet to see things better. For starters, since you are turbocharged, you do not need to display the 13.2 - 13.7 target line. What AFR are the turbo's looking for any way?
05-27-2005, 09:29 PM
#5
you should be able to set it for up to 50 times per second ( 0.020 sec or 20 millisec) on the lower lefthand corner of the input screen, haven't tried it yet though, you can record 18,000 inputs per log so the shorter the interval you read the shorter the log length term you'll have
Last edited by TeamRX8; 05-27-2005 at 09:34 PM.
05-28-2005, 12:14 PM
#6
Ex- member.
Thread Starter
Originally Posted by Nemesis8
since you are turbocharged, you do not need to display the 13.2 - 13.7 target line. What AFR are the turbo's looking for any way?
I updated the graph. Quoting Mazdamaniac "Greddy turbo aims for 12:1, but ends up at 11:1 or richer in some ranges. Safest is probably 11:1, though the Renesis is remarkably detonation resistant. Some of us tune for 12.5:1 or so."
I will go for 12.0-12.5 range. I may try to lower the AFR from 8.5k-9krpm since it's kindof high and leave the rest as-is. Mazdamaniac did a good job on the map.
06-03-2005, 01:01 AM
#9
Ex- member.
Thread Starter
CANscan bottoms at 12.0 and RP supercat leans out AFR
Well, I'm a freakin' idiot.
I've been tuning my greddy map by adding alittle fuel here/there (5k,6k, 8k, and 9k rpms). The two premaps show how "linear" I got it and between 12.0-12.5 and I thought I was a natural at tuning. Too good to be true. I'm actually running rich in the high rpms, but I don't know how rich.
I installed the RP supercat and did a couple of runs to see how my AFR map changed. I discovered that the CANscan bottoms out at 12.0!
So, if you've got a turbo and trying to aggressively tune it to 12.0-12.5, (or a safe range below this), the CANscan will not work since it doesn't show anything below 12. I've emailed Dan about this to see if he could help.
As far as the midpipe, it'll make you run leaner. Compare the 2 premaps with the 2 post midpipe maps. You can see the two humps in the 6k and 7k rpms shift upwards. I'm sure it would have been dangerously lean in the 8k-9k rpms section if I hadn't added fuel earlier. This confirms why people with the turbo and rp supercat were detonating in high rpms.
The midpipe sounds great, alittle deeper throatier sound. The backfiring is also louder. The butt dyno does feel alittle more umph in the high rpms.
So, back to square one on tuning this thing. I'll have to search to see what's a good O2 wideband gauge... I've read that some will burnout and others don't work very well.
I've been tuning my greddy map by adding alittle fuel here/there (5k,6k, 8k, and 9k rpms). The two premaps show how "linear" I got it and between 12.0-12.5 and I thought I was a natural at tuning. Too good to be true. I'm actually running rich in the high rpms, but I don't know how rich.
I installed the RP supercat and did a couple of runs to see how my AFR map changed. I discovered that the CANscan bottoms out at 12.0!
So, if you've got a turbo and trying to aggressively tune it to 12.0-12.5, (or a safe range below this), the CANscan will not work since it doesn't show anything below 12. I've emailed Dan about this to see if he could help.
As far as the midpipe, it'll make you run leaner. Compare the 2 premaps with the 2 post midpipe maps. You can see the two humps in the 6k and 7k rpms shift upwards. I'm sure it would have been dangerously lean in the 8k-9k rpms section if I hadn't added fuel earlier. This confirms why people with the turbo and rp supercat were detonating in high rpms.
The midpipe sounds great, alittle deeper throatier sound. The backfiring is also louder. The butt dyno does feel alittle more umph in the high rpms.
So, back to square one on tuning this thing. I'll have to search to see what's a good O2 wideband gauge... I've read that some will burnout and others don't work very well.
06-03-2005, 04:57 PM
#11
Ex- member.
Thread Starter
Originally Posted by TeamRX8
12.05 to be exact, and it's not that the CANScan can't read that low, it's that the Mazda sensor bottoms out
"I have seen AFR down to 11.2 before the Mazda sensor bottoms out. Let me check the software and make sure the reading is from the sensor output and not the Mazda calculated value. I'll get back to you later today."
06-03-2005, 05:12 PM
#12
Yeah, the CANScan isn't the best solution for tuning, though it is a nice tool.
I use an LM-1 for the real thing.
The trick with keeping it from burning up is to put the sensor downstream of the resonator if you have no CAT.
If you DO have a CAT, get and extender and build a good heatsink. If you mount it as close to the CAT as possible, it might survive. The Bosch LSU4.2 sensor that pretty much EVERY WBO2S uses is just not designed to be held at 1600° for a long time.
You will also find that your long term fuel trim aill lean the A/F after a while so don't go overboard when leaning out to above 12:1.
I'm running around 12:1 in a bunch of places under load, but there are some ranges that are somewhat leaner. If they don't ping, I leave them alone.
Correct A/F is not an absolute. Generally, 11.5:1 may be better, but the motor will tell you what it needs.
Thanks.
I use an LM-1 for the real thing.
The trick with keeping it from burning up is to put the sensor downstream of the resonator if you have no CAT.
If you DO have a CAT, get and extender and build a good heatsink. If you mount it as close to the CAT as possible, it might survive. The Bosch LSU4.2 sensor that pretty much EVERY WBO2S uses is just not designed to be held at 1600° for a long time.
You will also find that your long term fuel trim aill lean the A/F after a while so don't go overboard when leaning out to above 12:1.
I'm running around 12:1 in a bunch of places under load, but there are some ranges that are somewhat leaner. If they don't ping, I leave them alone.
Correct A/F is not an absolute. Generally, 11.5:1 may be better, but the motor will tell you what it needs.
Originally Posted by adrian-1
Mazdamaniac did a good job on the map.
06-03-2005, 08:02 PM
#17
Administrator
Originally Posted by MazdaManiac
No.
The OEM WBO2S in the RX-8 bottoms out at 12:1. The CAN bus simply won't show anything lower than that.
The OEM WBO2S in the RX-8 bottoms out at 12:1. The CAN bus simply won't show anything lower than that.
correct of course
i ran into that during beta testing and found that is the limit it will read.
06-25-2005, 06:14 PM
#21
Registered
Join Date: Aug 2003
Location: Brisbane, Australia
Posts: 1,459
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MazdaManiac
No.
The OEM WBO2S in the RX-8 bottoms out at 12:1. The CAN bus simply won't show anything lower than that.
The OEM WBO2S in the RX-8 bottoms out at 12:1. The CAN bus simply won't show anything lower than that.
251802.0736,MAF,32.47,
251802.0736,ThrottlePct,9,
251802.0736,EngineRPM,4363,
251802.0736,FuelLevel,53.3,
251802.0736,O2_2_1,0.905,
251802.0736,WideRangeO2_1,0.82106,12.0203184
251882.1888,MAF,18.56,
251882.1888,ThrottlePct,7.1,
251882.1888,EngineRPM,4276,
251882.1888,FuelLevel,53.3,
251882.1888,O2_2_1,0.915,
251882.1888,WideRangeO2_1,0.7854665,11.49922956
251962.304,MAF,13.88,
251962.304,ThrottlePct,6.3,
251962.304,EngineRPM,4236,
251962.304,FuelLevel,52.9,
251962.304,O2_2_1,0.935,
251962.304,WideRangeO2_1,0.758169,11.09959416
252042.4192,MAF,13.57,
252042.4192,ThrottlePct,7.1,
252042.4192,EngineRPM,4406,
252042.4192,FuelLevel,63.1,
252042.4192,O2_2_1,0.955,
252042.4192,WideRangeO2_1,0.7923595,11.60014308
252132.5488,MAF,14.37,
252132.5488,ThrottlePct,7.1,
252132.5488,EngineRPM,4389,
252132.5488,FuelLevel,63.1,
252132.5488,O2_2_1,0.965,
252132.5488,WideRangeO2_1,0.830881,12.16409784
252212.664,MAF,14.12,
252212.664,ThrottlePct,7.1,
252212.664,EngineRPM,4272
252212.664,FuelLevel,82
252212.664,O2_2_1,0.945
You'll notice here that I get readings below 12:1. So I'm not sure why you only get readings down to 12:1, unless it is a programming difference between US and Australian vehicles???
Last edited by sco; 06-25-2005 at 06:25 PM.
06-29-2005, 02:34 PM
#24
Registered User
Join Date: Apr 2005
Location: MD
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Speedrx8er
decisions decisions. E-tool or the Scan tool first ???? 
06-29-2005, 02:52 PM
#25
Originally Posted by Cynic10508
I got the scan tool first just to log some data and make sure that an investment in a piggyback ECU would be worthwhile. Peace of mind and all that jazz.
Cynic, good point
.Now sCANalyser or canscan. any different besides the price?
Thread
Thread Starter
Forum
Replies
Last Post
JimmyBlack
Series I Major Horsepower Upgrades
273
02-10-2020 10:23 PM