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Low HP and Torque on a 50 trim

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Wildt267

15+ Year Contributor
41
1
Apr 24, 2006
Salem, Oregon
SO i dynoed my car and damn near broke down in tears. At 22psi I only got 264awhp at 6400, and 238 ft lbs at 5400. For the sheet check the pictures in my profile. It's on a 8.5:1 built short block with a PTE 50 trim bb internally gated turbo. What's up? It was on a Mustang dyno, I know they read lower but... I read about many people who run better than that on a e316G. Any ideas of what i am doing wrong? THe shop that dynoed it said the winter formulation gas was holding me back. I called up Slowboy (whom I bought the turbo from) and the shopmanager told me he was running 400whp on a similiar setup. I am getting plenty of fuel(low 11's), and running the AEM EMS in speed density with 2.5" piping. I don't see airflow being a problem. I am running stock cams. Is it possible they would be holding me back that much. Ok, with all that being said, I throw myself at your mercy. Be brutal it you have to, what do you guys think is wrong?
P.S. Compression 160 across the board, 4% leakdown. I do get white/grey/blueish smoke under load. My mechanic said it could be excess fuel washing out the oil from my cylinder walls. Thanks for any help you guys can give.
 
Update: Turns out the knock sensor has been unplugged for a very long time, not at the motor, but on the ecu side of the wiring. At least it wasn't me. I suspected this, but did receive a very small, varying voltage while the sensor was unplugged. With that out of the way here's the deal: Installed BC 272's and a Forced performance race manifold. DId a log with the functioning knock sensor and: 1.93 volts of knock at 18psi, 6000rpm, 17 degrees of timing, 11.95afr, 98degree iat. That seems like a lot of knock given those conditions, am I right? I was hoping to increase timing and gain some power, but that doesn't seem feasible under these conditions, what am I missing? For the record: I did not log injector duty cycle on this run but it is usually 60% at 20psi, 6krpm-ism. Does anyone have any guidance for me on how to tune this out? Air temp trim maybe? Thanks for any help you can give.
I'll see what i can do about posting the aem log file.
 
Update: Turns out the knock sensor has been unplugged for a very long time, not at the motor, but on the ecu side of the wiring. At least it wasn't me. I suspected this, but did receive a very small, varying voltage while the sensor was unplugged. With that out of the way here's the deal: Installed BC 272's and a Forced performance race manifold. DId a log with the functioning knock sensor and: 1.93 volts of knock at 18psi, 6000rpm, 17 degrees of timing, 11.95afr, 98degree iat. That seems like a lot of knock given those conditions, am I right? I was hoping to increase timing and gain some power, but that doesn't seem feasible under these conditions, what am I missing? For the record: I did not log injector duty cycle on this run but it is usually 60% at 20psi, 6krpm-ism. Does anyone have any guidance for me on how to tune this out? Air temp trim maybe? Thanks for any help you can give.
I'll see what i can do about posting the aem log file.
 
Update: Turns out the knock sensor has been unplugged for a very long time, not at the motor, but on the ecu side of the wiring. At least it wasn't me. I suspected this, but did receive a very small, varying voltage while the sensor was unplugged. With that out of the way here's the deal: Installed BC 272's and a Forced performance race manifold. DId a log with the functioning knock sensor and: 1.93 volts of knock at 18psi, 6000rpm, 17 degrees of timing, 11.95afr, 98degree iat. That seems like a lot of knock given those conditions, am I right? I was hoping to increase timing and gain some power, but that doesn't seem feasible under these conditions, what am I missing? For the record: I did not log injector duty cycle on this run but it is usually 60% at 20psi, 6krpm-ism. Does anyone have any guidance for me on how to tune this out? Air temp trim maybe? Thanks for any help you can give.
I'll see what i can do about posting the aem log file.
 
To eliminate this as a possibility, are you sure you are using a 2G Knock Sensor with your EMS? Last I heard, the 1G sensor was incompatible with the EMS?

Also, if tuning on pumpgas, have you tried to richen the AFRs (12:1 seems a bit aggressive)? :dsm:
 
Switched over to the 2G sensor as soon as I installed the ems, so I have that covered. I will take your advice and add a little fuel, maybe 11.5:1? Thanks. The question still remains though: should I be expecting knock under these conditions, or is it indicative of other problems?
 
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