Civic SI Hondata Flashpro


Expert Tuning

Church Automotive Tuning Hondata FlashPro tuning

You've got to love the C16 shop fan stands.  The Dynapack dyno is much less conservative than a dynojet.  The important part is comparing gains, so we retuned the car to a stock tune for a baseline 210.8 hp and 158 tq.

After our bolt-on basics from our last article we wanted to eliminate errors caused on our own part by uploading a tune not optimized for our car.  We called in the big guns at Church's Automotive Testing in Wilmington, CA.  For a baseline we uploaded a stock, factory tune on our car with only the CT-Engineering intake and exhaust adding additional power.  Our Si put down 210.8 hp and 158 tq on their Dynapack dyno vs. where we left off at 167hp 118 tq on Technosquare's Superflow AutoDyn 30 chassis dyno.  As we did previously we also uploaded one of the base MAF tunes Hondata supplies for the AEM short runner intake.  As before the car achieved the same hp but with much more power in the mid-range between 5,000-6,500 RPM.

Tuning at Church

Laptop check, FlashPro check, dyno keyboard check.  The Si got a workout on the dyno this day.  40+ pulls were needed for tuning all the fuel tables at the various cam angles and because every motor responds a little differently.

Now the fun begins; a speed density map is used for reliability and repeatability and for tuning the high camshaft, (VTEC) is locked in at 3,000 RPM's.  Tuning adjustments were done in this order:

  1. Low and High speed cam Fuel tables with cam angle
  2. Low and High speed cam Ignition tables
  3. VTEC setpoint

K20 on Churchs Dyno

There were some pretty awesome cars in the garage including a MK4 Supra, a Mercedes C63 AMG and the owner's supercharged S2000 that puts down 400whp through the stock exhaust.  I think that Civic hatchback drag car makes 800whp.  One of the guys in the shop was also talking about a traction control system Hondata is working on utilizing the ABS sensors.  With variable levels of wheelspin you can get a hard launch without boiling the tires for maximum acceleration.

During this process we did dozens of pulls on the dyno justifying Church's recommendation of coming prepared with at least a quarter of a tank of fuel in the car.  At the end of our session the results were nothing short of astonishing.  Our tuned car made 4.2 hp and 3.5 tq peak power over stock but more impressive is all the power in the rev range.  We saw a nice big jump in torque of about 7 tq, which every Honda needs, starting at 3,500 RPM's all the way through 6,000 RPM.  There's a huge jump in torque starting at 5,000 RPM and 19 lb/ft from 5,800-6,200 rpms.  The horsepower curve is nice and progressive and with all these power gains, we will not miss the VTEC kick. 


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