Car breaks up under boost even under no load (Video with DETAILED description)
Dec 20, 2014, 08:37 PM
#17
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if injector duty is at 100% you def have spark blowout due to the large amounts of fuel you are dumping in, this would also explain the fouled plugs. im running 1200s and my injector duty is around 70%. 2150s are typically used for 800whp e85 setups which require 30% more fuel than pump.
Dec 20, 2014, 10:30 PM
#18
I have a double pumper.
Only one pump was powered at first.
My tuner powered the 2nd pump today and he said even at 136% injector duty cycle the car was going lean (14.0) into boost. Fuel pressure was around 60 psi into boost with both pumps running.
Would everyone agree the injectors can be the only probable cause at this point?
Brand new fic 2150s I can't believe this would be the issue but looks like it.
I even told him to remove the filter element just today in hopes that it was causing a resitrction. He told me it was clean, and it idled a little better without the element.
Only one pump was powered at first.
My tuner powered the 2nd pump today and he said even at 136% injector duty cycle the car was going lean (14.0) into boost. Fuel pressure was around 60 psi into boost with both pumps running.
Would everyone agree the injectors can be the only probable cause at this point?
Brand new fic 2150s I can't believe this would be the issue but looks like it.
I even told him to remove the filter element just today in hopes that it was causing a resitrction. He told me it was clean, and it idled a little better without the element.
Dec 21, 2014, 12:39 AM
#19
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if injector duty is at 100% you def have spark blowout due to the large amounts of fuel you are dumping in, this would also explain the fouled plugs. im running 1200s and my injector duty is around 70%. 2150s are typically used for 800whp e85 setups which require 30% more fuel than pump.
I think you're right because I was getting a P170 for a while before the tune.
can you watch fuel pressure related to boost? i tuned an sti that had a phantom lean condition that turned out to be the pressure relief valve in the pump itself leaking fuel intank. it showed high dc and went lean at boost but idled and under 50 psi fuel pressure was fine. i ended up powering the whole sending unit up outside of the tank and found it.
Each pump works individually I know that for sure. I have an aem gauge in cab so that's what the tuner has been referencing
Last edited by evolvedevo91; Dec 21, 2014 at 02:29 AM. Reason: correct obd code number
Dec 21, 2014, 02:57 AM
#20
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Does anybody else think e85 would be a better fuel for these injectors?
I'm about ready to drain my 93 and get the e85 in there. Tuner seems to favor e85 as well.
I'm about ready to drain my 93 and get the e85 in there. Tuner seems to favor e85 as well.
Dec 22, 2014, 06:45 PM
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#2 pump doesn't power on until I'm in boost (so it hasn't powered on yet)
I mentioned it to my tuner and he didn't act like that was an issue.
I'm pretty sure the click is normal I mean it is a relay that turns on and off. Not sure why it's so loud now.
And tuner also told me a little bit of oil is normal in the CAS housing.
So now I'm back to square one. And have no idea what's wrong.
Last edited by evolvedevo91; Dec 22, 2014 at 06:48 PM.