[Boost controller and wastegate preload]

Thank you for your reply.

Back in 2005 the dealership fitted a turbocharger to the N/A ts and I think the same exhaust system was kept, except for the added uppipe and downpipe, which its the same diameter as the other parts. (2 inches)

[Boost controller and wastegate preload]

Hi, I recently installed a simple electronic boost controller (reads only boost from engine, no revs or load etc... ) It works great from 2nd gear till 4th and keeps the desired pressure (0,4 bar) from low revs till high.The problem occurs on 5th medium to full load were the boost goes at 0,5bar and fuel cut hits. It may be controllers fault but I don't know if it happens because my internal wastegate was already preloaded before the controller installation to 0,450 bar (5th gear full load). Should I loosen it a bit?

[Unequal headers to TS]

Hi,

I would like to ask if it's possile to fit unequal headers (lets say from a 2005 WRX ) to a 1,6 TS which has a turbo already?

I know that the up pipe should be re aligned but apart from that is anything else I'm missing??

[unisia jecs ECU]

LoL thats nice!! I hope you have good memories too... if those 5 months include february you may saw the biggest halloween parade in Greece.

[unisia jecs ECU]

Well, the turbo makes the car more torquey but the truth is that the real party starts from the 2.0l and above!!! Its a mediocre and not a very reliable solution and thats why only the local dealer did it...But it made many people mad and frustrated, especially the 180hp version, because the engine was intended for N/A from SUBARU. In the next months or years  I'm thinking either to install forged pistons with shorter rods or wrx engine swap which is the best alternative. For now respect (low boost, proper engine warming an cooling before turning off ) and proper maintenance will keep the car and me happy for many miles (or kilometres as we use here! )

[unisia jecs ECU]

Just out of curiousoty, is there much to get out from a 1.6, i thought the 95 HP (EU) was quite the max.

well rverdoold the local dealer had that model fitted with a turbocharger with modified wastegate actuator (cut open and welded again :-o ),  front or top mount i/c, closed circuit bov, a louder exhaust, a parallel ecu to handle fuel management because of the turbo and a..."s turbo" sticker!

They gave two options 150hp and 180hp. I searched for a used 150hp model because the 180hp ones broke down more often, and its logical since no fuel and oil pumps were changed and no forged pistons were fitted (current compression ratio 10:1 )... mine can handle 0.4bar and after that the parralel ecu cuts fuel... thankfully!!

I suppose they did what they did because of tax issues since here (Greece), till now, the higher displacement the more taxes you pay and not by the hp as in Germany, so it looked like a good thought, but they didn't do it right. The reason i asked info for the n/a model was to avoid confusion because TS is known as a N/A impreza to the rest of the market...

[unisia jecs ECU]

Does anyone knows if a unisia jecs ecu of the 2005 impreza ts model 1.6l (N/A, with cable throttle) can be reprogrammed with ecutek tools or if is it reprogrammable at all? Because my tuner told me its possible but everybody else says the opposite..... this is a pic of the ecu chip

[sensors explanation]

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)

[Fuel cut question]

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)

[sensors explanation]

It's a 2005 impreza ts 1600cc with has been modified by the local dealership (light turbo kit, exhaust), the check engine light is off. I had the ECU remaped (unicia jecs) and fitted a lrger intake, but I cant pass 0.5 bar even with the zener diode trick on the boost controller

[sensors explanation]

Thanks for your response, I'm trying unsuccesfully to mess with the fuel cut  limit (0.5 bar) and besides fooling the boost sensor (zener diode) I dont know what else I have to check....

[sensors explanation]

Can anybody tell me the name and the function of the shown sensors? throttle pic air intake pic

[Fuel cut question]

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--- 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.

[Improve low end torque]

Thanks for the quick response!

I just googled MegaSquirt and it seems very promising but unfortunately I dont have that kind of knowledge (yet...!!!)  I will search for a local tuner or subaru mechanic to tell me exactly whats up with my ecu because as far as I know the local dealership made the turbo convertion and they added a piggyback to the stock ecu to handle the extra boost. About the budget I will try to get the best with the current parts and if there is no real difference I ll consider getting new ecu and wider exhaust and maybe a twin scroll turbo (max 2.500 - 3000 euros)

Does anyone know how to reset ts ecu because there are several choices depending on the age of the car (1 unplug car battery  2 connect the green and black plugs under steering column  3 take the ecu battery out and 4 by OBD port)

[Improve low end torque]

Hi, I recently bought a 2005 impreza 1.6l with an ihi rhb5 turbo (about 150 hp) and I noticed that the real boost starts over 3800-4000 rpm (100+ octane gasoline). The thing is that I dont want (for now...) more power I just want a little bit more torque at lower rpm (lets say 1000 rpm less). I checked over the internet and I saw 2 or 3 propable solutions. 1) wider exhaust pipe for lower back pressure in order to help turbo spool up faster 2) stiffer spring in wastegate actuator 3) remap ecu

What is the best to start with and because stock ecu isnt a good choice for remapping I would like a suggestion for an aftermarket one.

Thank you in advance.

[New owner new member]

Hello to everybody, I owe a 2005 impreza 1.6 ts with a ihi rhb5 turbo (150 hp). It is not very fast but for me it is a good base to start and I hope that with your help I will make it better.