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Old 06-07-2004, 10:54 PM   #1
mwrxmax
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Default need some help with modded injectors

I just installed a fp green turbo, aps fmic,sti ver 6 gears and modded injectors on my 2002 wrx. The car idles poorly and is in the limp mode as you cannot rev it past 4200 rpm's. It also smells like gas . I have done a search and I have the custom speedo gear from Rallispec and the speedo works, the Maf is installed properly and clean. I had been running a stage 4 map from txs with the utec. I upgraded my software to 4.2 scaled the injectors to 850 set to run olf and thought that it would run to get it dyno tunned. The map I am using is the one off there web site. I do not know alot about using the utec and just want to be able to get it to Chicago and on the dyno. I also have a catless txs system and I have not thrown a code since resetting the computer. Can anyone help with some ideas about what might be wrong or what I may not have done right?
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Old 06-07-2004, 11:50 PM   #2
happasaiyan
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WBO2?

what does the stock O2 sensor read at idle? that will tell you where you stand. you might be running too rich.

you can use almost any map in OLF with injector scaling and get anywhere you want...just dont cross into OLF or boost.
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Old 06-08-2004, 12:55 AM   #3
mwrxmax
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I do not have a wide band o2, I just got my laptop so I will see what the o2 sensor is reading when I get home thurs.
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Old 06-09-2004, 07:46 AM   #4
mwrxmax
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I got my car to boost, the boost controller was not installed right,but it still does not idle at all. Does anyone with modded injectors have any tips. On Fri I will try adjusting the map.
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Old 06-09-2004, 08:36 AM   #5
hippy
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I don't have modded stock injectors, but I can give ya a tip. Check This Thread Out. It might be a good idea not to go into boost without having your fuel map tuned. You can adjust upto where the a/f ratio goes richer then 12.5 to 1, but past that you need a wbo2 sensor to see the a/f ratio and make adjustments. This basically means that you shouldn't go past 8psi at hard throttle without a wbo2 sensor/tuned map.

At partial throttle, the ecu always tries to shoot for a given a/f ratio(about 14.6 to 1). If your setup is off enough that the ecu can't compensate for the change in fuel being put out and air that it sees, the a/f ratio at partial throttle will be screwed up. By scaling your injectors so much(to 850), you make it so the ecu is going to have to try and add fuel to get the a/f ratio where it wants. If you have a larger then stock diameter maf piping, the ecu will have to add a lot of fuel compared to the air it sees. B4 adjusting any hard throttle fueling(10-100% columns), it would be good to scale the injectors correctly for your setup so that you don't have to go adding a ton of fuel to the map. Most people use a obd2 scanner which reads fuel trims to see what the scaling/adjustments to the 0% column(partial throttle fueling column) do to how the ecu fuels. You could probably get pretty close by just lowering the scaling a little at a time til your a/f ratio goes to 14.7 to 1 at idle and feels good. Ya might wanna screw around with the scaling a bit and drive around a bit at partial throttle once ya think ya get it right get it right for your setup. The bigger the diameter your maf piping compared to stock, the lower the scaling will end up being with a 0% column value of 0. If something changes later on, you can always check the fuel trims with an obd2 scanner and make adjustments to the 0% column. Um, good luck.

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Old 06-09-2004, 09:46 AM   #6
cdvma
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I think you need to scale them a lot higher than 850. I remember messing with them a while ago (I'm not using the scaling anymore) and I think it still ran very rich at idle. You are probably still going to have to pull #s out of the 0% column.
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Old 06-09-2004, 10:00 AM   #7
Zackbo
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Actually, you're probably running really lean at idle. If you're using 4.2, you've gotta add a lot of fuel to the 0% to get your fuel trims in order. I know this seems backwards, but it's true. I had to go to +8.5 initially, and then to +10 when I added headers. You need to taper it down to 0 by 5k though, or you will be running way rich above 5k. This is with 850 in the injector scaling parameter. There's a thread here started by Macabre that will help you a lot.
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Old 06-09-2004, 07:45 PM   #8
mwrxmax
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I think I read that thread about adding +# in the 0% . I will try some small adjustments and see how it reacts. My understanding of the scaling injectors is that it converts the 850cc vs stock 440cc into a fraction then adjusts the fuel map accordingly. does that sound right? I do not really understand how it affects the 0% column however.
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