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Project Fit : Hondata Flash Pro and bolt ons

This 2008 Honda Fit Sport has recently been equipped with the recently released Hondata Flash Pro, and we hit the dyno to try and get a baseline before further mods.

Current mods on vehicle :

AEM CAI Intake
DC sport 4-1 ceramic header
Skunk2 60mm cat back exhaust
Denso IK-22 plugs and 91 octane pump gas

Equipped with basic I/H/E and nothing too fancy, we visit Dynospot Racing once more to use their Dynojet 448x. With no changes to the factory tune, the Fit puts down 87 whp and a very decent curve but overly rich at 12.1:1 air fuel ratio. At redline the car approaches a 11.7:1 ratio….. lol rich much?

After the basic changes to speed limiter and rev limiter, we advance the VTEC engagement point 500 rpm, and make adjustments to the lo and hi fuel tables.

Leaning out the midrange and top end of the car helps out quite a bit, and the Fit improves 14 hp and gains 8 ft lbs of torque. As this vehicle is primarily a road course and autocross vehicle, and straight line performance is not as important, we conservatively tune the car for serious duty and optimum safety.

The Hondata has allowed us to extract the horsepower that our mods were supposed to provide. The basic header, intake, and exhaust mods made the stock ecu compensate by running the car rich, and after tuning the car is much more responsive across the board.

The modest gains in power aren’t as evident as the increase in overall driveability and response. This FlashPro is an excellent choice for anyone looking to maximize their modifications or even take the next step by going forced induction.

Next up, a Honda Fit header comparison before our other Project Fit goes turbo!

Happy tuning!

Project Fit – Hondata’s New Flashpro

Well, it’s been a long time waiting for our 2008 Project Fit Sport, and with dreams of turbo whooshes, we’ve finally received our Hondata FlashPro. Our FlashPro is part number FP-FIT-US-120001, (yep number one baby!) and after our supporting turbo mods, we are ready to install the FlashPro and start tuning!

Newest changes to the FlashPro as it pertains to our Honda Fit are :

  • Added support for the 2012 Civic Si, 2013 ILX, 2007-2008 Fit.
  • [Traction Control] Firmware 6
  • FlashPro firmware updated to version 47
  • [Civic Si / Type R] Added learned fuel trim under closed loop parameters

After flashing the unit, we are ready for install and setup of the most basic parameters. I will outline a few of the settings we’ll be adjusting. As this Fit is still a daily driver, we’ll be aiming to retain it’s factory emissions and gas mileage without disrupting how the car drives or feels on the road.

To do this, we’ll be looking at tuning the Fit in closed loop mode while referencing the “closed loop target lambda” table in the FlashPro.

This controls the target lambda (air/fuel ratio) when the vehicle is running in closed loop. A combination of tables is used the set the target lambda, based on temperature and load.

Next up : Trying to squeeze as much power and torque from the engine stock as possible, before slapping on our turbo kit and going for broke.

Happy tuning!

Case Studies : Installing a AEM UEGO into a Honda Fit

We’ll be installing a AEM wideband 02 sensor into our 2008 Honda Fit Sport in order to determine a baseline reading before bolting on our turbo kit.

YOO… AEY… GOOO!

The UEGO part number in question is 30-4100, this unit is an excellent low cost choice for those needing accurate A/F readings, and can provide an optional digital 0-5v output for datalogging or standalone ecus.

In order to get the best possible reading, we’ve got to find the best possible location for our wideband sensor. On this particular Fit, we go with the factory midpipe as the inlet is directly behind the header’s collector.

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