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Old 03-28-2024, 09:49 PM   #1
Open Loop
2013 FR-S Whiteout / SSC
 
Join Date: Aug 2016
Drives: 2013 FR-S
Location: Pennsylvania
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Live data parameters for stock engine?

Hi everyone, I recently ran my car on a hub dyno against a fellow competitor/friend's autocross car. The cars' modifications that might impact engine performance are minimal (air filter and cat back exhaust).

My car was running about 2.5% weaker than my buddy's car across the powerband, and I am hunting for causes. We have considered things like oil viscosity, gas, condition of driveshafts, air filters.

I am about to replace the MAF and plugs, but I pulled some live data to have a benchmark for the effects of changes I make.

2013 FR-S, 90,000 miles. New direct injectors, cleaned port injectors, new O2 sensor within the last year. Plugs have less than 30k on them. Updated 2015 coils and wiring harness last year.

Here are some of the readings, after running for 12 minutes, at idle:

LOAD-PCT 22.7-25.5
STFT 0.8
LTFT 7.0
MAP (inHg) 8.56 - 8.86
SPARKADV 12.5
MAF(g/s) 2.02 - 2.22
TP(%) 13.7
O2S12(V) 0.715 - 0.730
FRP(psi) 565.00 - 575.80
LAMBDA11 0.994-1.004
O2S11(v) 2.184-2.220
FLI(%) 74.1
CATEMP(F) 544.10
LOAD-ABS(%) 15.3 - 16.1
TP_R(%) 2.0
TP_B(%) 30.6
APP_D(%) 13.3
APP_E(%) 12.9
TAC_PCT(%) 0.0
EVAP_VPA(inH2o) 392.77
APP_R(%) 0.0

I've read that a LTFT percentage within 10% is acceptable, but I am interested in whether that is the case for the 2013 FR-S.

Does anyone see anything here that is suspicious?

Is fuel rail pressure really that high?

Is there a source for the expected "live data" parameters for this engine somewhere?

Thanks in advance.
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