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Old 11-12-2015, 03:43 PM   #1
Soarer
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Default 1000cc Injectors Needing To Be Tuned Like 740cc Injectors

My car is at EFI Logics and THE MAN, Mike Botti is tuning it and he ran into some issues. I bought a set of DW 1000cc side feed injectors, have the receipt and flow sheet, which Mikey said should be running about 50% duty cycle for my build. The issue is, to get the car to run right, he had to dial them up to 70% duty cycle. He said that from what he is seeing, they are performing like 740cc injectors. I did a fuel pressure test and it was making 45psi at idle and 55psi at 10lbs positive manifold pressure so the fuel pump and regulator seem to be fine. I also swapped in another known good fuel pressure regulator before I tested the fuel system. There's a DW 65c pump in the tank.

Beyond the obvious "they sent you 740cc injectors by mistake" logic, what other things could cause a set of 1000s to perform like 740s?

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Old 11-14-2015, 07:12 PM   #2
bluemax189
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mike is one of the premier Subaru tuners. I would say the obvious is the obvious for a reason. He was probably telling you in a nice way theyre not really 1000cc injectors.
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Old 11-14-2015, 07:47 PM   #3
Soarer
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Originally Posted by bluemax189 View Post
mike is one of the premier Subaru tuners. I would say the obvious is the obvious for a reason. He was probably telling you in a nice way theyre not really 1000cc injectors.
I would tend to agree with you and if I had bought the injectors used, I would suspect that someone pulled a fast one on me. However, I bought the injectors new and have a flow sheet from DW on them. The numbers on the sheet correspond to the numbers engraved on the injectors. This leads me to believe that I did get 1000cc injectors. To confirm, I really need to send the injectors out to be flow tested again.

For argument sake, let's say that they ARE 1000cc injectors. What tests can I run or parameters can I datalog to start pointing me in the right direction?
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Old 11-14-2015, 07:48 PM   #4
bluemax189
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All the tests and everything are fine but at the end of the day if 1000s are tunign down to 740s then the max youll get is the same as 740s.
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Old 11-15-2015, 03:36 PM   #5
Soarer
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All the tests and everything are fine but at the end of the day if 1000s are tunign down to 740s then the max youll get is the same as 740s.
740s are plenty to run my motor. I'm not making huge horsepower. I just want to find out what's wrong with the motor.
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Old 11-15-2015, 04:49 PM   #6
quazimoto
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740s are plenty to run my motor. I'm not making huge horsepower. I just want to find out what's wrong with the motor.
Doesn't sound like anything is wrong with the motor,just possible the injectors. Have you tried contacting DW about the issue? Are you running the stock rails still?
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Old 11-15-2015, 10:45 PM   #7
Soarer
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Doesn't sound like anything is wrong with the motor,just possible the injectors. Have you tried contacting DW about the issue? Are you running the stock rails still?
Left a message with them. Didn't hear back.
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Old 11-17-2015, 09:50 AM   #8
martin028
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They may just flow close to 740, after tuning ID1000's I found they actually flow a lot closer to DW850's, but then that makes me think that DW's are on point and you may just have 740's..
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