1.8 injector size?
Thread Starter
Registered User
Joined: Feb 2003
Posts: 527
From: Glen Rock, PA
Car Info: 95 Impreza coup, green, 5speed 1.8l awd
I was hoping I was wrong but with 180cc injectors i think the 1.8 cant make more power than 130hp without going over 80% max injector duty cycle and that could explain why after having a header back exhaust, intake, chip and flywheel that the engine loses power after 4 to 4.5k rpms
calculations from here http://www.rceng.com/technical.htm
calculations from here http://www.rceng.com/technical.htm
Guest
Posts: n/a
Suppose I ran a S-AFC (Apex-i) with a ProECM chip on larger injectors (WRX?).
I have a custom 'cool' air/short ram intake and full exhaust- Gen. 4 header, Stromung high flow cat, 2.25" piping back to a magnaflow muffler. Also UD light pully kit. So I've got the capacity to flow a nice amount of air.
My question is, would increasing injector size with proper management gain enough power to make the mod worth while? I also plan on converting to parallel fuel delivery as per ravensblade's instructions, when I have the time.
-Andy
I have a custom 'cool' air/short ram intake and full exhaust- Gen. 4 header, Stromung high flow cat, 2.25" piping back to a magnaflow muffler. Also UD light pully kit. So I've got the capacity to flow a nice amount of air.
My question is, would increasing injector size with proper management gain enough power to make the mod worth while? I also plan on converting to parallel fuel delivery as per ravensblade's instructions, when I have the time.
-Andy
Thread Starter
Registered User
Joined: Feb 2003
Posts: 527
From: Glen Rock, PA
Car Info: 95 Impreza coup, green, 5speed 1.8l awd
well i have been thinking about that too
because $500 for even used parts to get an unknown HP
but if you where to get cams or swap a 2.5 heads and short block then i would definetly do this
because $500 for even used parts to get an unknown HP
but if you where to get cams or swap a 2.5 heads and short block then i would definetly do this
Thread Starter
Registered User
Joined: Feb 2003
Posts: 527
From: Glen Rock, PA
Car Info: 95 Impreza coup, green, 5speed 1.8l awd
Rallysportz you have about the same setup as me except i have a 13lbs exedy flywheel
i would guess that it should give atleast 10 to 15 because when the ecu advances the timing i starting felling the problem and not before
i would guess that it should give atleast 10 to 15 because when the ecu advances the timing i starting felling the problem and not before
NASIOC Slut
iTrader: (2)
Joined: Nov 2002
Posts: 4,723
From: Roseville, CA
Car Info: 1995 Subaru Impreza 1.8 L
The injectors you would look for would be like old 2.2 injectors, I think they may be higher CC like 220. The Legacy turbo injectors are 360 and bolt right in. WRX, RS, etc. wont fit the 1.8. Yes, an S-AFC will be able to compensate but only up to 2x the CC I believe... But I doubt you would get more power just by adding fuel, unless you are talking turbos.
Thread Starter
Registered User
Joined: Feb 2003
Posts: 527
From: Glen Rock, PA
Car Info: 95 Impreza coup, green, 5speed 1.8l awd
well its just the fact that i think the 1.8 might be able to make more power than the injectors can put out safely if at all
i understand just adding more fuel is not going to give more power if the a\f ratio good but in the upper rpms it feels like it need more fuel
i understand just adding more fuel is not going to give more power if the a\f ratio good but in the upper rpms it feels like it need more fuel
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Originally posted by BAN SUVS
Even if they work, changing injectors would cause more problems than they solve without some sort of fuel trimming.
Even if they work, changing injectors would cause more problems than they solve without some sort of fuel trimming.
