Injection on old school version 3 STI

poormansporsche · 10-06-2006, 02:35 AM

So I'm swapping a version 3 STI into my L wagon. Only problem is the gas in Los Angeles ain't what they got in Japan. One has to mix CA 91 and 100 octane in order to avoid detting. Not really that big of an issue since it is available but it's 9 dollars a gallon. I also plan on driving it long distances which could be a problem in cities like Los Banos which wouldn't have 100 octane.

The question:

Can I just keep the stock ecu and throw in a water/alcohol injection system and be ready to rock? Have it kick in at like 4 PSI and just fill up on 91. I know people have run w/a injection on the stock WRX maps with no mods but since the tune is quite aggressive for our gas not sure how that would roll.

cheers

garrett

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tasq · 10-06-2006, 04:07 PM

No. You will need to be tuned for the alky/meth.

poormansporsche · 10-06-2006, 04:16 PM

Damn I guess I'm going to need to setup an account with Torco Fuels then

cheers

garrett

hippy · 10-06-2006, 04:39 PM

Even though being tuned for injection is optimal, you don't need to be tuned for alc/water injection for it to help stop your engine from knocking. Course you might need to run it below 0psi to stop the engine from knocking. There are many things to take into consideration, and when all is said and done it would probably be easier to have your car tuned.

I'm pretty sure they don't use what we consider to be 100 octane all the time in japan. I think they use 100 ron, which might be like 92-95 octane here?

peace

poormansporsche · 10-06-2006, 04:43 PM

Thats really all I'm looking for. I just don't want it to knock. It starts knocking at about 4k rpms. I'm not looking for more power just want to run safely and don't want to buy new ECU. Ecutek isn't an option on the older STI's unfortunately. So is this a yes or a no?

cheers

garrett

10-06-2006, 02:35 AM	#1
poormansporsche Scooby Specialist Member#: 79798 Join Date: Jan 2005	Injection on old school version 3 STI So I'm swapping a version 3 STI into my L wagon. Only problem is the gas in Los Angeles ain't what they got in Japan. One has to mix CA 91 and 100 octane in order to avoid detting. Not really that big of an issue since it is available but it's 9 dollars a gallon. I also plan on driving it long distances which could be a problem in cities like Los Banos which wouldn't have 100 octane. The question: Can I just keep the stock ecu and throw in a water/alcohol injection system and be ready to rock? Have it kick in at like 4 PSI and just fill up on 91. I know people have run w/a injection on the stock WRX maps with no mods but since the tune is quite aggressive for our gas not sure how that would roll. cheers garrett * Registered users of the site do not see these ads.

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10-06-2006, 04:07 PM	#2
tasq Scooby Specialist Member#: 62362 Join Date: May 2004 Chapter/Region: RMIC Location: Denver, CO Vehicle: 2005 wrx CGM	No. You will need to be tuned for the alky/meth.

10-06-2006, 04:16 PM	#3
poormansporsche Scooby Specialist Member#: 79798 Join Date: Jan 2005	Damn I guess I'm going to need to setup an account with Torco Fuels then cheers garrett

10-06-2006, 04:39 PM	#4
hippy Scooby Specialist Member#: 36528 Join Date: May 2003 Location: florida Vehicle: 2002 Impreza Wrx Silver	Even though being tuned for injection is optimal, you don't need to be tuned for alc/water injection for it to help stop your engine from knocking. Course you might need to run it below 0psi to stop the engine from knocking. There are many things to take into consideration, and when all is said and done it would probably be easier to have your car tuned. I'm pretty sure they don't use what we consider to be 100 octane all the time in japan. I think they use 100 ron, which might be like 92-95 octane here? peace

10-06-2006, 04:43 PM	#5
poormansporsche Scooby Specialist Member#: 79798 Join Date: Jan 2005	Thats really all I'm looking for. I just don't want it to knock. It starts knocking at about 4k rpms. I'm not looking for more power just want to run safely and don't want to buy new ECU. Ecutek isn't an option on the older STI's unfortunately. So is this a yes or a no? cheers garrett