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Old 12-16-2018, 03:12 AM   #1
Fl4t_Matt
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Exclamation NEED HELP wrx in failsafe fuel map

Ok guys, I have an 05 WRX with a turboback exhaust and short ram intake, stock tmic and 650cc injectors. The car started to stutter a few months ago so I switched the tune from e85 to a different more conservative 91 tune as the 85 tune was locked and is now unfortunately lost. http://www.romraider.com/forum/viewt...p?f=28&t=10407
I am using the USDM_04_WRX_stg2_stockbcs file and the car wont do a pull. If I try to full throttle I can hit 10 psi and the car cuts out and richen to an 8.5 afr. It is currently in the failsafe fuel map due to what I believe to be low IAM however I can not figure out the reason why. There are no leaks anywhere and im not sure if it has to do with the injectors (However they are able to put out the 8-9 afr levels quite constantly with the fuel output) but I will be ordering new injectors soon and see if it helps at all. For now I need any and all experiences / opinions for what I can do or what I can edit in the tune to fix this. I think it may be due to the maf scaling but I am not experienced enough to mess with that alone.
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Old 12-16-2018, 07:05 PM   #2
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so did you just flash some 91 tune you found on the internet? a stage 2 tune is designed for the stock injectors which are about 450cc so your 650cc will be blasting tons of fuel in there if you didn't change the scaling. as for the IAM that could be due to other factors but you need to tune for the injectors first before going any further.
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Old 12-17-2018, 12:04 AM   #3
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Originally Posted by CarmelValleyWRX View Post
so did you just flash some 91 tune you found on the internet? a stage 2 tune is designed for the stock injectors which are about 450cc so your 650cc will be blasting tons of fuel in there if you didn't change the scaling. as for the IAM that could be due to other factors but you need to tune for the injectors first before going any further.
I did tune for the injectors but this happened even after, im not so sure its due to the injectors. I think it might be more toward the maf side of things as this tune is for a stock intake and I have a short ram but I dont know enough to scale the maf myself.
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Old 12-19-2018, 01:16 AM   #4
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Bump.
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Old 12-21-2018, 08:18 AM   #5
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How did you tune for the injectors without scaling the maf?
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Old 12-21-2018, 11:39 AM   #6
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How did you tune for the injectors without scaling the maf?


Latency and flow scaling. I donít know how to scale the maf, Iím just an amateur Tuner.
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Old 12-21-2018, 06:32 PM   #7
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why do you need to rescale the MAF? its not like he was going to a 3 in intake or something
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Old 12-21-2018, 09:06 PM   #8
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why do you need to rescale the MAF? its not like he was going to a 3 in intake or something


Itís higher flowing than the stock so the maf wonít put in the correct numbers for afr. Which could possibly lead to the low iam but Iím not positive on any of this itís just what Iíve gathered from researching.
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Old 12-21-2018, 09:09 PM   #9
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Itís higher flowing than the stock so the maf wonít put in the correct numbers for afr. Which could possibly lead to the low iam but Iím not positive on any of this itís just what Iíve gathered from researching.
I don't think you are correct, the maf is used to measure volume of air, so if y I u don't change the volume there is no need for rescaling
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Old 12-21-2018, 10:37 PM   #10
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I don't think you are correct, the maf is used to measure volume of air, so if y I u don't change the volume there is no need for rescaling


Wouldnít the short ram with a different filter do that since it would flow or would that only happen with changing the inlet sizing. (I also have an aftermarket inlet)
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Old 12-21-2018, 10:55 PM   #11
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Uhh the only way it does if you change the size of the pipe from the stock size as far as I know and even then you can. Rescale the fuel map to compensate for the wrong metering of air
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Old 12-22-2018, 07:11 PM   #12
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Uhh the only way it does if you change the size of the pipe from the stock size as far as I know and even then you can. Rescale the fuel map to compensate for the wrong metering of air


Ok so I talked with my tuner and he said itís more likely on the boost control side of things, itís wanting to overboost and the wg is fighting it and going back and forth causing the stutter, will update further when I get it checked out.
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Old 12-23-2018, 12:55 AM   #13
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don't worry about MAF scaling a whole lot (as long as AFR is close) until you can keep the car from going into failsafe fuel map. once the IAM stays up and its in the standard map you can fine tune your MAF.
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Old 12-23-2018, 12:57 AM   #14
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Wouldnít the short ram with a different filter do that since it would flow or would that only happen with changing the inlet sizing. (I also have an aftermarket inlet)
the MAF will read the increase in air (not that an "intake" does much). putting a bigger size MAF tube requires rescaling because the air slows down through the tube for a given air flow.

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Uhh the only way it does if you change the size of the pipe from the stock size as far as I know and even then you can. Rescale the fuel map to compensate for the wrong metering of air
changing the OL map instead of fixing MAF scaling seems a bit backwards.
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Old 12-23-2018, 01:39 AM   #15
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the MAF will read the increase in air (not that an "intake" does much). putting a bigger size MAF tube requires rescaling because the air slows down through the tube for a given air flow.



changing the OL map instead of fixing MAF scaling seems a bit backwards.
I didnt st it was the best way, just it can be done unles you are maxing out the voltage on the maf then you are sol
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Old 12-23-2018, 02:36 AM   #16
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don't worry about MAF scaling a whole lot (as long as AFR is close) until you can keep the car from going into failsafe fuel map. once the IAM stays up and its in the standard map you can fine tune your MAF.


Trying to get that in check now but I have no idea what it could be thatís giving low IAM anymore, Iím trying to buy some injectors from someone to check with that since mine are a bit old and weíre on e85 most of their lives and it canít be the inlet because itís no more than 6 months old and I checked all the fittings and hose clamped everything.
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Old 12-23-2018, 03:25 PM   #17
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well have you logged the car to make sure its not knocking like crazy? could need a different timing map to keep it from knocking all the time.
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Old 12-23-2018, 09:06 PM   #18
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well have you logged the car to make sure its not knocking like crazy? could need a different timing map to keep it from knocking all the time.


I havenít on the current time yet but Iím so new I probably wouldnít know what half of it said let alone how to fix it.
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Old 12-24-2018, 01:09 AM   #19
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well the first step is to learn about it so you can fix the knock. then fine tune your MAF once the knock is under control.
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Old 12-24-2018, 02:29 PM   #20
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I would just check to see if the Wastegate is stuck open on the turbo housing...happens to me from time to time. Feels like theres no power at all.
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Old 12-26-2018, 01:49 AM   #21
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I would just check to see if the Wastegate is stuck open on the turbo housing...happens to me from time to time. Feels like theres no power at all.


Yea me and my tuner kind of came to the conclusion the car wants to overboost and itís fighting the wastegate so itís like over boost, wastegate cutoff, over and over and thatís causing the stutter. It has plenty of power before it hits that point itís just not allowing it to keep going and pull, so I ordered some 800cc injectors and weíre going to do a full retune off of the base map and see if we can get it to stop fighting it and just let it hit the full 18lbs
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Old 12-26-2018, 07:26 AM   #22
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I run 565cc on a 16g and full boost to 20. Loosing up the wasgate actuator one turn or mess with the wastegate duty cycle. If you over boost your target, then IMO, you shouldn't have any issues hitting your target then maintaining it. Sounds like ur wastegate arm is too tight or the wastegate duty cycle is too high...in thos type of weather especially i over boost all the time by like 3 psi because of the colder air...my injector duty cycle is higher near 95+%...but ask your tuner about loosening the acuator arm 1 turn...if you're not over boosting too bad, then 1 turn, if youre over boosting bad then try 2 turns to loosen it.
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Old 12-26-2018, 07:28 AM   #23
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I run 565cc on a 16g and full boost to 20. Loosing up the wasgate actuator one turn or mess with the wastegate duty cycle. If you over boost your target, then IMO, you shouldn't have any issues hitting your target then maintaining it. Sounds like ur wastegate arm is too tight or the wastegate duty cycle is too high...in thos type of weather especially i over boost all the time by like 3 psi because of the colder air...my injector duty cycle is higher near 95+%...but ask your tuner about loosening the acuator arm 1 turn...if you're not over boosting too bad, then 1 turn, if youre over boosting bad then try 2 turns to loosen it.
Or you have stock turbo, the ot could just come down to VE of the air coming out the compressor and not vveinng aabllle to maintain that psi...but ive heard people running 18-20 psi on their stock turbos
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Old 12-26-2018, 04:47 PM   #24
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but you are saying your only hitting 10psi when it cuts out. that's not over boosting. and why would injectors affect boost? we already know your injectors can supply 8:1 AFR according to your OP, so why do you need bigger ones?. everything in this thread is completely backwards. get a new tuner maybe. if your ECU us in failsafe it will run obscenely rich and only hit wastegate boost. fix all the knock you are getting so it stays in the standard maps and actually uses the WG duty cycle table then fix your MAF, injectors, and boost tables.

Last edited by CarmelValleyWRX; 12-26-2018 at 04:52 PM.
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Old 12-26-2018, 04:53 PM   #25
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have you owned this car its whole life? what engine is in it? what compression ratio is it? is it a built motor for E85 perhaps? is it a hybrid 2.5l? if any of these are true it will require a new timing map.
also do you know for sure the injectors are 650cc? maybe they are bigger and are scaled for E85.
the best way to fix all of this is to put on the stock intake and MAF, with stock MAF scaling, and then scale your injectors so it works right. then go back and fine tune the MAF.

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