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Old 05-09-2010, 09:23 AM   #1
bpcrally
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Default Stage 2 2004 wrx injectors at 100%

Hey guys. Just checking this out to be safe. I finally got around to driving with the ap in the car. I was checking the injector duty and I noticed it was hitting 100%. Is this normal?
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Old 05-09-2010, 11:23 AM   #2
freetors
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i've seen mine at about 105% before. it's pretty normal for a stage 2 setup
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Old 05-12-2010, 12:43 PM   #3
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^^^^^^^^^^^^^WHAT?!?!?!!?!??!?!?!


that doesn't sound normal at all. You want your injector duty cycle to be in the 80's. If you're higher than 95% you need bigger injectors.
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Old 05-12-2010, 05:47 PM   #4
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Injectors for stage 2 cars tend to be right around the limit of the size you can get away with. This is especially true on the STI in some cases. The question is, are your injectors going static? If so, you need to check your fuel system. Make sure your filter isn't clogged or that the vacuum line to the fuel pressure regulator isn't cracked, broken or loose.

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Old 05-14-2010, 01:47 PM   #5
bpcrally
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not sure what you mean by going static?

all i know is when i wot it takes a second but eventually reaches 100%.. im also hitting around 16.8psi which i believe is dead on for stage 2

i just wasnt sure if injectors should be maxing out
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Old 05-14-2010, 09:54 PM   #6
robbieshonda
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Quote:
Originally Posted by bpcrally View Post
not sure what you mean by going static?

all i know is when i wot it takes a second but eventually reaches 100%.. im also hitting around 16.8psi which i believe is dead on for stage 2

i just wasnt sure if injectors should be maxing out

get a walbro and a protune you'll be straight. Walbro to ensure you have enough fuel getting to the injectors. the protune because your car is probably running fat as hell on the top end which is showing you the high IDC's
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Old 05-18-2010, 08:34 AM   #7
bpcrally
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if i get a walbro fuel pump with just my cobb ots tune, will that be okay? or do i need a protune to swap the fuel pump?
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Old 05-18-2010, 09:19 PM   #8
skater0422
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It won't. You don't need a protune to add a pump, BUT, It in and of itself will not fix your problem. A pump will not lower your injector duty cycles by itself.
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Old 05-19-2010, 11:41 AM   #9
bpcrally
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is a pro tune really worth the extra 400-500 extra? i know theres a difference between the OTS and protune.. but is it 400-500 worth of difference? i know the power wont change too much..

or am i better to save that money for when i actually do something bigger, ie vf39 or 16g.
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Old 05-25-2010, 11:34 PM   #10
skater0422
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A protune IS worth the money. IMO it is not for your power levels but it is not good that you are running static injectors. If you check your fuel system over and replace a few bits to find yourself still running high IDCs then it may be worth looking into.

You need to get more fuel into your engine, you can replace your fuel filter to make sure it is flowing well to start. As well as check your fuel pressures in boost (not easy if your are a novice). You could assume your pressures are good, and that flow is your problem (after the filter replacement). Replace your pump with a higher flow unit and you may see the IDCs pull down some. Don't expect the world. Non of this requires a tune, could be cost efficient, and could solve your problem but, then;

If you up your injectors you will need a tune.

If you up your injectors and your intercooler you can up your boost too, with resonable supporting mods. This too will require a tune, of course, but will also require a bigger smile when your press your right foot to the floor as well .
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Old 05-26-2010, 09:25 AM   #11
bpcrally
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^ good info. thanks for letting me know
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