[HELP] EVO VIII MR 2004, Fuel cut on boost / hit brick wall
12 Attachment(s)
Hey everyone,
I appreciate anyones time and help, When im driving normal everything seems fine, When i hit boost under 30% TPS it seems fine as well Once i go past 30-40 % TPS and i hit boost i seem to be getting a fuel cut or boost cut, i literally feels like im hitting a brick wall, and i don't now why? i have attached some logs and info about my mods if anyone can help me figure out why im hitting a brick wall that would be so helpfull I haven't connected boost gauge to my ecu yet as im still trying to learn how to do that but if someone could help me without that kind of data that would be so helpfull ! Evo 8 MR 2004 1250 Bosch injectors stock cams 460 walbro fuel pump wired to battery with relay/fuse ets hot and cold side piping custom made COP kit (toyota yaris cops) Screamer dump pipe with 3" exhaust back Also if anyone can help me with a guide on how to log load1B that would be helpfull Thanks Krys |
Try reducing what you log to just TPS, RPM, TimingAdv, Speed, Knock, WidebandAF, InjDutyCycle, LoadMUT2Byte, to get higher resolution logs
A lot of times that sudden loss of power under boost can be fuel pressure related, so check your regulator to make sure you didn't lose the boost source vacuum line |
Originally Posted by recompile
(Post 11869213)
Try reducing what you log to just TPS, RPM, TimingAdv, Speed, Knock, WidebandAF, InjDutyCycle, LoadMUT2Byte, to get higher resolution logs
A lot of times that sudden loss of power under boost can be fuel pressure related, so check your regulator to make sure you didn't lose the boost source vacuum line I am running stock fuel regulator, I will deffinately check it tomorow, i remember that the end of the hose was once brittle and i cut it shorter and its fitted verry tight, maybe its kinked? will have to look into this tomorow on another note could anyone tell me what they think of my ign/afr tables? https://cimg5.ibsrv.net/gimg/www.evo...a6f493cb27.png Thanks!!! |
Originally Posted by recompile
(Post 11869213)
Try reducing what you log to just TPS, RPM, TimingAdv, Speed, Knock, WidebandAF, InjDutyCycle, LoadMUT2Byte, to get higher resolution logs
A lot of times that sudden loss of power under boost can be fuel pressure related, so check your regulator to make sure you didn't lose the boost source vacuum line BTW thank ytou so much for your videos and guides ive been reading and watching! Also what do you think of these tables here?? https://cimg7.ibsrv.net/gimg/www.evo...e65edcefc6.png |
Originally Posted by Krystal8U
(Post 11869173)
Hey everyone,
I appreciate anyones time and help, When im driving normal everything seems fine, When i hit boost under 30% TPS it seems fine as well Once i go past 30-40 % TPS and i hit boost i seem to be getting a fuel cut or boost cut, i literally feels like im hitting a brick wall, and i don't now why? i have attached some logs and info about my mods if anyone can help me figure out why im hitting a brick wall that would be so helpfull I haven't connected boost gauge to my ecu yet as im still trying to learn how to do that but if someone could help me without that kind of data that would be so helpfull ! Evo 8 MR 2004 1250 Bosch injectors stock cams 460 walbro fuel pump wired to battery with relay/fuse ets hot and cold side piping custom made COP kit (toyota yaris cops) Screamer dump pipe with 3" exhaust back Also if anyone can help me with a guide on how to log load1B that would be helpfull Thanks Krys |
I am no pro at tuning on ECUflash but both your fuel and timing maps dont look right for many reasons. Also, what fuel are you running? If on pump gas, the timing looks to be a bit on the high side.
|
Originally Posted by Lumpy Sticks
(Post 11869255)
I am no pro at tuning on ECUflash but both your fuel and timing maps dont look right for many reasons. Also, what fuel are you running? If on pump gas, the timing looks to be a bit on the high side.
im running e85 my 460 is wired up the the battery with a fuse and relay hiw ever I am running factory fuel pressure reg also I checked my fuel pressure reg the lines seem okay but I replaced them anyways just to be sure, still having issues :/ gonna make a boost leak tester today and also check the turbo for play |
Originally Posted by Biggiesacks
(Post 11869246)
You need a tephramod rom to log the good 1byte load. Which has an adjustable multiplier that needs to match between your rom and evoscan. You could be hitting your load limit and causing fuel cut. Are you running that 460 pump at full power all the time or do you have the relay hooked up to a hobbs switch and are preserving the factory low voltage operation?
i just set up load last night and it was going past 285 which is what it was set to, so I slowly increased it, I’m at 310 now and no more boost cuts how ever now I’m only boosting to 16psi and have a loss of power ?? |
Originally Posted by Krystal8U
(Post 11869306)
yeah I’m running tephra mod v7
i just set up load last night and it was going past 285 which is what it was set to, so I slowly increased it, I’m at 310 now and no more boost cuts how ever now I’m only boosting to 16psi and have a loss of power ?? |
found a boost leak!
fixed it and now my issue is sorted |
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