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Guest Message by DevFuse
 

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Fuel cut question

impreza 2005 ts turbo 1st stage fuel cut

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#1 M@nos_krt

M@nos_krt

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Posted 08 February 2014 - 10:30 AM

Hi, I recently remapped my 2005 ts turbo and added a larger air intake, I noticed that pressure was the default 0.2 bar. The performance is noticeably better so i,m sure that the tuner didn't fool me. The reason of my post is that I tried  to raise pressure to 0.6-0.7 bar but fuel cutter hits at 0.5 bar. I took it back and he explained how the MAP sensor works and ecu cuts fuel (mine is a Hitachi PS60-01 boost sensor). he plugged a pda to the OBD and messed with the values(dont know exactly what he did) and told me to test again. I did, with same results. Next thing he did was to connect a zener diode (4.7 v) -see attached pic---Attached File  20140207_200821 (1024x768).jpg   104.13K   1 downloads to fool the sensor but failed again. I tried myself with 4.3 ,3.9 even with 3.6 and car couldnt accelerate so I stopped. Nothing can raise the limit of the cutter and it seems that something else intervenes. {There is a temp sensor after the air intake filter, connected to the boost sensor but dont know if has anything to do with it.}

Does anybody knows what is going on, a solution maybe?

 

PS. I just need to go only 0.1-0.2 bar over the fuel cut limit, not anything extreme.


Edited by M@nos_krt, 08 February 2014 - 10:46 AM.


#2 M@nos_krt

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Posted 09 February 2014 - 11:22 AM

I know I answer my own question but in order to help others that have similar setup I found out that the fuel cut occurs not by main ecu but by a parallel ecu that monitors pressure via  vaccum solenoid. so boost controller has nothing to do with it. I have been also told that over 0.4 bar is a no go with my current setup (I need forged pistons, oil pump, gas pump, bigger intecrooler to reach 0.7 safely) :(


Edited by M@nos_krt, 09 February 2014 - 11:23 AM.






Also tagged with one or more of these keywords: impreza, 2005, ts, turbo, 1st stage, fuel cut

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