Cobb SFR Issues
10-30-2010, 04:57 PM
#26
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Configuration 2:
I moved the Mazdaspeed intake to the end of my piping where the SFR MAF sensor would be placed. Attached is an image and a datalog.
I moved the Mazdaspeed intake to the end of my piping where the SFR MAF sensor would be placed. Attached is an image and a datalog.
10-30-2010, 05:03 PM
#27
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Finally I ran the car again with SFR's configuration and took another datalog. As you can see the car did hunt less with the Mazdaspeed in the stock location but it was still going from -6 to 6 in the trim.
If anyone has any ideas I am all ears, I am about out of ideas.
If anyone has any ideas I am all ears, I am about out of ideas.
10-31-2010, 02:56 AM
#29
Have you considered a bad O2 sensor?
Once you force to open loop - if it idles nicely then your O2 sensor may be fragged, your tune could be off, you could have a small unmetered air leak, injector latencies could be off, etc....
Idle is one of the hardest things to tune, because small changes have a big impact. You can put the stock P1 injectors in and that will tell you if your latencies are off.
Once you force to open loop - if it idles nicely then your O2 sensor may be fragged, your tune could be off, you could have a small unmetered air leak, injector latencies could be off, etc....
Idle is one of the hardest things to tune, because small changes have a big impact. You can put the stock P1 injectors in and that will tell you if your latencies are off.
10-31-2010, 09:01 AM
#30
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The P1's are the stock injectors.
Since I put the mazdaspeed intake on the car I dont see how there could be a vacuum leak.
I wonder if its a bad O2 or bad MAF sensor. They both still give readings but I did notice the stock wideband sometimes varies from my aftermarket but i dont know if that is because of latency.
The only other thing that I could think of was when I got the upgraded injectors from KG parts they removed the caps. While there wasn't much room they didnt fit quite as snug in the stock Injector O rings. I dont think that could cause anything but its the only variation the car had over stock.
Since I put the mazdaspeed intake on the car I dont see how there could be a vacuum leak.
I wonder if its a bad O2 or bad MAF sensor. They both still give readings but I did notice the stock wideband sometimes varies from my aftermarket but i dont know if that is because of latency.
The only other thing that I could think of was when I got the upgraded injectors from KG parts they removed the caps. While there wasn't much room they didnt fit quite as snug in the stock Injector O rings. I dont think that could cause anything but its the only variation the car had over stock.
11-08-2010, 10:55 AM
#32
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Well I can officially call myself an idiot. In my infinite wisdom I had relocated my rear O2 sensor and not my front. Needless to say once I relocated the correct sensor the car ran much better. Idle is good and ST Trims are not hunting all over the place.
I did notice that the ST Trims were very negative. After a couple drive cycles my LT Trims went to -14. So I am going to guess that my MAF scaling is incorrect. I ran the car our of gear up to 6000 rpms. I noticed that at above 6k the AFR's get really rich and the car stutters and stumbles. I imagine that has to do with the tune and perhaps since I upgraded injectors they may be off.
The last and troubling thing is that my AEM Wide band is reading different AFR's then what the ECU/Cobb is reading. At idle my AEM is reading 15.3 while the Cobb sees 14.7
I did take the car for a quick drive around the block. Here are 2 datalogs i took when I drove it around a little bit. The 8 is before the LT trims had adjusted too much. The 11 has the LT trims at -14.
I am waiting to hear back from MM about a new tune but no word for a while now.
I did notice that the ST Trims were very negative. After a couple drive cycles my LT Trims went to -14. So I am going to guess that my MAF scaling is incorrect. I ran the car our of gear up to 6000 rpms. I noticed that at above 6k the AFR's get really rich and the car stutters and stumbles. I imagine that has to do with the tune and perhaps since I upgraded injectors they may be off.
The last and troubling thing is that my AEM Wide band is reading different AFR's then what the ECU/Cobb is reading. At idle my AEM is reading 15.3 while the Cobb sees 14.7
I did take the car for a quick drive around the block. Here are 2 datalogs i took when I drove it around a little bit. The 8 is before the LT trims had adjusted too much. The 11 has the LT trims at -14.
I am waiting to hear back from MM about a new tune but no word for a while now.
11-08-2010, 03:48 PM
#35
1) I noticed that at above 6k the AFR's get really rich and the car stutters and stumbles. I imagine that has to do with the tune and perhaps since I upgraded injectors they may be off.
2) The last and troubling thing is that my AEM Wide band is reading different AFR's then what the ECU/Cobb is reading. At idle my AEM is reading 15.3 while the Cobb sees 14.7
2) The last and troubling thing is that my AEM Wide band is reading different AFR's then what the ECU/Cobb is reading. At idle my AEM is reading 15.3 while the Cobb sees 14.7
2) The AEM sensor needs a heat sink to operate accurately with a rotary engine.
11-08-2010, 05:19 PM
#37
11-08-2010, 06:13 PM
#39
I divide by zero
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11-08-2010, 09:26 PM
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2.) Wow, think heat is the issue? The car was only at idle and had just been run for 10-15 min total never going above 3k rpms. What heatsink do you recommend? or would it be better to relocate to a cooler location?
Last edited by baysj; 11-08-2010 at 09:38 PM.
11-08-2010, 09:43 PM
#42
don't be too worried about your wideband being a bit off - just know how it relates to the stock one and mentally adjust for it . Not a lot you can do about it anyway - unless ........... does anyone know if the guage is adjustable ?
Were you able to check your stock one against the dyno one when you dynoed the car ?
Were you able to check your stock one against the dyno one when you dynoed the car ?
11-08-2010, 09:49 PM
#43
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No, I didn't have the AP when I had the car on the dyno. I was still running the ole Int-x. I did think my wideband was a little off from the one at the shop but i couldn't compare side by side because they removed my sensor to put the one in from the shop.
11-09-2010, 07:17 AM
#44
I didn't realize you were tuning while not in gear.
11-09-2010, 08:45 AM
#46
So, at this point in time, you have properly installed your SFR kit? You have contacted Tim at SFR and he guided you along the "updates" that MM discovered were needed when MM went to San Diego to deal with Wanted Two's car? You have implemented these updates and any other potential mechanical errors during the installation of your SFR kit?
If so, the only thing that is left is to properly submit a request for a new calibration from MM.
If so, the only thing that is left is to properly submit a request for a new calibration from MM.
11-09-2010, 09:26 AM
#47
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Yes, I have the updated kit from Tim at SFR. Tim has been very helpful and he as assured me that I have made all the fixes that were required on WantedTwo's car. The one being the relocation of the wideband to just before the turbo. From what I can tell the kit is installed just fine and is "Drivable". Brettus pointed out that the MAF scaling of the map seems to be a little off not that its the maps fault but the SFR 3.5" pipe is thicker then the AEM and I can see my MAF readings are higher with the SFR intake over the AEM at the same rpm's.
I sent an email to MM with maps of the car driving around the parking lot on saturday. Once I got everything sorted. I had sent him some other maps earlier when I had relocated the rear wideband and not the front but in my last email I asked him to ignore them.
I sent an email to MM with maps of the car driving around the parking lot on saturday. Once I got everything sorted. I had sent him some other maps earlier when I had relocated the rear wideband and not the front but in my last email I asked him to ignore them.
11-09-2010, 10:19 AM
#48
Sounds good.
As long as Jeff/MM is made aware that you have a 3.5" MAF pipe (as well as all the other inquisitive questions he needs answered on his "Deadly" list), all should go well.
As long as Jeff/MM is made aware that you have a 3.5" MAF pipe (as well as all the other inquisitive questions he needs answered on his "Deadly" list), all should go well.
11-09-2010, 10:31 AM
#49
just to be sure, apparently a lot of people don't do their data logs properly, which wastes time and delays the process:
https://www.rx8club.com/mazdamaniac-183/accessport-instructions-instructions-197783/
https://www.rx8club.com/mazdamaniac-183/accessport-instructions-instructions-197783/
11-09-2010, 10:32 AM
#50
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All that was included in the original request a few months ago. Though now that I have run the car I can see that the effective size of the MAF housing must be slightly smaller because my MAF readings are higher.