Background: I just acquired a 2017 Fiesta ST with ~25,000 miles. The car is an entirely unmodified, one-owner California car that's been well maintained, so a good starting point from which to build. I am planning to do a number of things to the car, going for a mild 'OEM+' type of build. My goal is to build the ultimate back road/street car. While I am open to getting the car on track, I want to build it for the street. Usable power, maintaining the wonderful driving dynamics these cars come with from the factory. No interest in just spinning tires or winning highway roll races.
Planned modifications (most of which I already have):
The methodology: I decided that a third gear pull, measuring 30-70 mph and a number of sub-segments within that range (30-50, 50-70, 40-60), would work best. This range doesn't require any gearshifts and won't induce much/any wheelspin. I'm doing these tests on the same stretch of road, and will run them with the same fill of gas (half tank, shell 93). I recognize that as ambient temperatures get warmer, it will muddy the data a bit. But my test equipment (Racebox Mini) calculates density altitude, which can be used to normalize data. For each modification 'phase', I am doing 5 runs and counting the best time achieved.
Initial results (all runs are in third gear, sport mode):
Baseline (Stock Car):
Slope: 0.4%
Max acceleration (G): 0.22
30-50 MPH: 2.86
50-70 MPH: 3.07
40-60 MPH: 2.91
30-70 MPH: 5.94
Phase 1 (Stock Car + ITG Panel Filter):
Slope: 0.5%
Max acceleration (G): 0.23
30-50 MPH: 2.76
50-70 MPH: 3.02
40-60 MPH: 2.83
30-70 MPH: 5.79
Next steps: tomorrow, I will be installing the OZ Superturismo GT wheels and measuring the impact of a modest reduction in unsprung weight (I believe it is around 2 lbs per corner, but need to weigh them with the tires installed). I would welcome any ideas for modifications, tests, etc.
Backup data/outputs (this testing suite has a bunch of cool features, and can output all GPS/accelerometer data at 25 hz, meaning measurements every 1/25th of a second):
Baseline (Stock Car):
Phase 1 (Stock Car + ITG Panel Filter):
Planned modifications (most of which I already have):
- New wheels (I just received a set of 17" OZ Superturismo GTs from Tire Rack wrapped in G-MAX AS07s for now, summer tires when it gets warmer)
- Lowering springs (Swift) are in the mail
- Accessport in the mail (coming preloaded with the Mountune 93 octane file, but planning to try dizzy, stock cobb, stratified and others)
- Minor tune/motor ancillaries
- Symposer delete
- Drop in filter (ITG)
- Colder plugs (NGK Ruthenium)
- RMM (vibra technis)
- Intercooler (have not yet procured, as it's still very cold out in the north east)
- ST200 airbox w/cold air feed hose (have not yet procured)
- Possibly a mild exhaust at some point (FSwerks)
- Open to other ideas! But I'm trying to keep things moderate.
The methodology: I decided that a third gear pull, measuring 30-70 mph and a number of sub-segments within that range (30-50, 50-70, 40-60), would work best. This range doesn't require any gearshifts and won't induce much/any wheelspin. I'm doing these tests on the same stretch of road, and will run them with the same fill of gas (half tank, shell 93). I recognize that as ambient temperatures get warmer, it will muddy the data a bit. But my test equipment (Racebox Mini) calculates density altitude, which can be used to normalize data. For each modification 'phase', I am doing 5 runs and counting the best time achieved.
Initial results (all runs are in third gear, sport mode):
Baseline (Stock Car):
Slope: 0.4%
Max acceleration (G): 0.22
30-50 MPH: 2.86
50-70 MPH: 3.07
40-60 MPH: 2.91
30-70 MPH: 5.94
Phase 1 (Stock Car + ITG Panel Filter):
Slope: 0.5%
Max acceleration (G): 0.23
30-50 MPH: 2.76
50-70 MPH: 3.02
40-60 MPH: 2.83
30-70 MPH: 5.79
Next steps: tomorrow, I will be installing the OZ Superturismo GT wheels and measuring the impact of a modest reduction in unsprung weight (I believe it is around 2 lbs per corner, but need to weigh them with the tires installed). I would welcome any ideas for modifications, tests, etc.
Backup data/outputs (this testing suite has a bunch of cool features, and can output all GPS/accelerometer data at 25 hz, meaning measurements every 1/25th of a second):
Baseline (Stock Car):
Phase 1 (Stock Car + ITG Panel Filter):
