2004 wrx keeps dropping boost on 2nd,3rd,4th,5th - Subaru WRX Forum
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  • 1 Post By arcticscythe
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post #1 of 3 Old 06-25-2014, 02:48 AM Thread Starter
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2004 wrx keeps dropping boost on 2nd,3rd,4th,5th

Hey guys I've got a 2004 wrx with sti top mount,sti turbo and sti injectors
On 18 pounds of boost
Now nearly every time I take of 1st extends out to 8k rpm then a change to second and as soon as I get to 5-6 k rpm I instantly drop boost but if I change to 3rd it boost back up and then drops again at 4500 rpm
And back fires heaps not sure what is the problem
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post #2 of 3 Old 06-25-2014, 05:32 AM
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What kind of blow off valve do you have? Any way of getting a data log? Boost usually does taper down some near redline. How are you tuned?

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post #3 of 3 Old 06-26-2014, 04:03 PM
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Just a new IC, injectors and turbo? That said my guess is either a part of your tune or a pressure loss from faster injectors without a faster fuel pump. Most times I recommend that drivers upgrade their injectors with the pump at the same time, In your case If you have a stock pump it would have 10 years of gunk in the filter as well and when the engine is asking for more fuel it might be the bottleneck. I would pull a few logs and look at your actual AFR, if its looking lean during those RPM levels that could be a sign of a pump.

I would also stop running past redline : / If you've only done injectors, IC, and turbo then im pretty sure redline is around 7 not 8. Its not worth running the RPMs that high, most tunes peak around 5,500 RPM, shifting at 6,500 with proper technique t should keep you in boost range and isnt such a risk to the bearings.
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Slow is Smooth > Smooth is Fast
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