NA EMU Tuning
03-30-2007, 10:17 PM
#76
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Originally Posted by Brettus
I've never seen more than 7% LTFT & then only after an ECU reset .
Are you sure you are not tuning in closed loop somehow ?
Are you sure you are not tuning in closed loop somehow ?
I also tested at which particular airflow voltage would 30% throttle be. I then only tune at 3V airflow which is about 30% throttle and 3000rpm and above. Do let me know if it is wrong?
03-31-2007, 12:43 AM
#78
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Yes, under the emu airflow correction map. There is a choice of tuning using rpm against throttle position or rpm against airflow voltage. I was told that airflow voltage would be better and more accurate then throttle position as throttle position is more often use for racing where it is mostly at 100% throttle.
Can anyone tell me if it is true?
Can anyone tell me if it is true?
03-31-2007, 01:14 PM
#79
It is true.
Airflow voltage is an actual load measurement.
Can you send me a copy of your MAPs so I know what we are discussing here?
You can send it right to my e-mail.
jeff at mazdamaniac dot com. Change the "at" to "@", the "dot" to"." and ditch the spaces!
Take that SPAM-bots!
Airflow voltage is an actual load measurement.
Can you send me a copy of your MAPs so I know what we are discussing here?
You can send it right to my e-mail.
jeff at mazdamaniac dot com. Change the "at" to "@", the "dot" to"." and ditch the spaces!
Take that SPAM-bots!
03-31-2007, 02:37 PM
#81
Originally Posted by MazdaManiac
It is true.
Airflow voltage is an actual load measurement.
!
Airflow voltage is an actual load measurement.
!
I'm pretty sure my scanalyser will only measure air flow in kg/s which must take in to account temp. as well as airflow . Perhaps a certain kg/s is the trigger ?
Last edited by Brettus; 03-31-2007 at 02:40 PM.
03-31-2007, 11:15 PM
#82
I've never attempted to find the exact switch-over point.
I'm not sure it would be obvious except to have access to that flag in the CANbus scan, which I don't have since the CanScan doesn't show that (at least not in the non-.NET versions).
That said, I haven't really needed to know that information since I'm only concerned with high load for tuning purposes and I can force open-loop by shutting off the WBO2S.
I'm not sure it would be obvious except to have access to that flag in the CANbus scan, which I don't have since the CanScan doesn't show that (at least not in the non-.NET versions).
That said, I haven't really needed to know that information since I'm only concerned with high load for tuning purposes and I can force open-loop by shutting off the WBO2S.
04-02-2007, 07:45 AM
#85
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Thanks! Will try it and see if it decreases my ltft. So I just need to follow your input values? Cause I do not know the cc of the primary injectors and the secondary ones as well. IS it right to sae i need to retune once i scale up the injectors?
Another thing, there is a NVCS map. Is the boomslang harness wired to use it? I remb reading somewhere it can be used to forced open loop?
Another thing, there is a NVCS map. Is the boomslang harness wired to use it? I remb reading somewhere it can be used to forced open loop?
Last edited by CoupeM; 04-02-2007 at 08:28 AM.
04-02-2007, 12:07 PM
#86
You will want to reset your PCM after changing these values to reset the LTFT.
The actual injector values on the RX-8 are 290cc, 380cc & 380cc.
By telling the EMU that you have slightly increased the size of the primaries, it will scale them down a bit which will trim the mix lean overall and reduce the LTFT subtraction.
To use the NVCS for forced open-loop, you need the dongle I was talking about earlier.
The actual injector values on the RX-8 are 290cc, 380cc & 380cc.
By telling the EMU that you have slightly increased the size of the primaries, it will scale them down a bit which will trim the mix lean overall and reduce the LTFT subtraction.
To use the NVCS for forced open-loop, you need the dongle I was talking about earlier.
04-04-2007, 01:56 PM
#89
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I still have not increased injector sizing on emu yet but i did a couple of runs to see my afr and also the LTFT.
I read in one of your post that under WOT it is suppose to go to 0 but idle is -12%. But for me it only drops to -10 to -12% under WOT.
To where do I wired the dongle to?
I read in one of your post that under WOT it is suppose to go to 0 but idle is -12%. But for me it only drops to -10 to -12% under WOT.
To where do I wired the dongle to?
04-05-2007, 01:28 PM
#90
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What afr should I be looking at from 3000rpm to 5000rpm? Above that I tune for 13.7 - 13.2afr. I tried to scale up the injectors but then at 6500rpm my car felt like there is a rope tugging it back. So I now retune it without scaling up the injectors. My ltft at WOT is -9.6% and -13.6% at idle.
04-13-2007, 07:54 AM
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Originally Posted by CoupeM
What afr should I be looking at from 3000rpm to 5000rpm? Above that I tune for 13.7 - 13.2afr. I tried to scale up the injectors but then at 6500rpm my car felt like there is a rope tugging it back. So I now retune it without scaling up the injectors. My ltft at WOT is -9.6% and -13.6% at idle.
05-20-2007, 10:18 PM
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06-03-2007, 10:29 AM
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I got a very stupid question but I feel I have to ask.
Our first O2 sensor is wideband. So is there still a need to use an external O2 wideband to read the afr? I tried using the car's sensor and compare it with the external wideband. The external wideband reads much leaner then wat the car's O2 reads. Which is more accurate?
Our first O2 sensor is wideband. So is there still a need to use an external O2 wideband to read the afr? I tried using the car's sensor and compare it with the external wideband. The external wideband reads much leaner then wat the car's O2 reads. Which is more accurate?
06-03-2007, 01:54 PM
#100
That all depends.
First of all, if you after market wide band is not installed before your CAT, it will read lean.
Second, if you intend to use any sort of "spoofing" on your OEM WBO2S, you will need the after market unit because the OEM unit will not be responding during the periods when you are forcing the tuning into open loop.
First of all, if you after market wide band is not installed before your CAT, it will read lean.
Second, if you intend to use any sort of "spoofing" on your OEM WBO2S, you will need the after market unit because the OEM unit will not be responding during the periods when you are forcing the tuning into open loop.