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Hondata, Inc.
2840 Columbia St
Torrance, CA 90503
  • 4850 rpm VTEC point decreased from 6000 rpm
  • 7600 rpm rev limit (sportshift mode only in the auto)
  • Maximum torque gain 28 ft/lbs torque at 6000 rpm (24 ft/lbs auto)
  • Maximum power gain 32 hp at 6000 rpm (28 hp auto)
  • Peak torque increases from 165ft/lbs at 4700 rpm to 168 ft pounds at 4700 rpm
  • Peak power increases from 201 hp at 7100 rpm to 204 at 6800 rpm (up to 8hp - auto)
  • Very wide flat smooth torque curve. 90% of peak torque available from 2000-7000 rpm.
  • Fully dealer compatible - works with all Honda scan tools and equipment

This reflash will work very well with an 06 TSX in stock form, or with headers and intake.


  • $295

Hondata does not sell direct - all sales and payment must be conducted through Hondata dealers. The upgrade information form must be sent with your ECU.

Results for Auto Transmission 06 TSX with no modifications

  • Solid green line - Stock ECU
  • Dotted green line - Reflashed ECU

Click to enlarge picture

Tuning Notes.

These graphs show the best of the stock Auto ECU vs the worst of the reflashed. The red line between 6500 rpm and 6900 rpm shows the correct power and torque curves. The green spike in these locations is due to the torque converter unlocking before gearshift.

The reflash shows a few ft-lbs of torque more than expected. This may be due to the fuel tank being topped up with a different variety of fuel between the tests.

VTEC and Rev limit are identical to the manual with a maximum gain of 25 ft-lbs and 28 HP at 5800 rpm. The 7600 rpm limit is only available in sportshift mode.

Overall the reflashed 06 Auto performs very well easily beating a stock (non reflashed) 04/05 manual above 5000 rpm for power and torque.

Disclaimer. This smoothes and flattens the torque curve. You will lose the kick you had at 6000 rpm. As such it may be difficult for some people to "feel" the reflash. A before and after dyno will show the results though.

Results for Manual Transmission 06 TSX with no modifications

  • Pink Line - Stock ECU
  • Blue Line - Reflashed ECU

Click to enlarge picture

Results for Manual Transmission TSX with intake

  • Green Line - Stock 06 with reflash
  • Red Line - Stock 06 with reflash and cold air intake

Note the loss in torque from 2400 to 3200 rpm. Intakes such as the Comptech Icebox will not do this.

Click to enlarge picture

Who can use this upgrade?

Any 06 TSX K24A2 TSX with the ECU part numbers (covers all current 06 ECU part numbers) :

  • RBB-A04 & A05 - 06 TSX
  • RBB-A59 & A61- 06 TSX Auto

How do I remove my ECU and immobilizer?

The ECU is located behind plastic panels to the right of the driver's right foot and the left of the passenger's left foot. Both panels will need to be removed. You will need a Philips screwdriver and 10mm socket. Complete removal instructions are to be found on this page. Alternatively you may download and print out the TSX ECU removal pdf file (300k).

Driving Impressions

This reflash is difficult to feel because it keeps the torque delivery flat and smooth to a much higher RPM. Rather than the torque dropping 28ft/pounds from 5000 rpm to 6000 rpm stock, the reflash keeps the torque drop to only 10 ft pounds between 5000 and 7000 rpm. VTEC transition at 4850 rpm is also very smooth and hard to detect with a stock air box.

Feedback from 04 TSX owners

Video comparison between a stock 04 TSX and Reflashed 04 TSX. The difference will be greater between a stock and reflashed 06 MT TSX.

Click picture to play (2.2 mb Quicktime)

Review from the Temple of VTEC

Tsx536: I took it to redline about 20-30 times and all I can say is WOW! You can definitely notice the difference! The car just drives differently. It's much smoother and responsive. The car pulls a little harder from 2k-3k and much harder from 3K-7K than it did before! The extra power up high in the RPM range can definitely be felt! It feels like you can take off and pick up speed much faster than before. Hondata was exactly what I was looking for! I would recommend it to any other TSX, especially any with a 5AT with cold air intake. I now consider the Hondata the official #1 best bang for the buck mod.

drkangel348: All I have to say about the Hondata reflash is that it makes the car into a different monster... It pulls so much harder now!! Its a complete different car, I'm loving it... Right now I only have the Injen CAI but I plan to install Comptech Headers and Exhaust soon... . But yeah Hondata should be the first mod for your TSX! It totally changes the attitude and performance of the car. My car is so much more responsive now, THANKS HONDATA!

vwong: When I got on the freeway, I was merging in and I was at 3rd gear around 5k rpm. I floored it to see what it was like at higher rpm. Oh my god......holly shit!!! What a difference!!! The throttle response is like instant. The car hauled ass from 5k rpm all the way to 7600 rpm. Before the reflash, I could tell that the car was a bit sluggish if I were to do the same thing. But after the reflash, the torque is readily available starting at 4500 rpm. I'm very impressed. Hondata did a good job giving us more "punch". I can definitely feel the difference. Keep in mind that my car is bone stock (engine wise). I highly recommend the Hondata reflash. So if anyone is still thinking about it, DON'T. GET THE HONDATA REFLASH NOW!!!


The 06 TSX has the following improvements:

Increased intake flow:

  • Intake valve + 1 mm oversize
  • Intake cam High lift lobe with 0.9 mm more lift and 12 degrees more duration
  • Throttle body increased from 60-64mm
  • Radius on some intake pipes increased from 70-80mm

Increased exhaust flow

  • Exhaust Head pipe increased from 60-65mm
  • Higher flow catalytic converter
  • Main (single) exhaust pipe increased from 54-57mm
  • Rear (twin) pipes increased in diameter from 42.5 to 45mm

Block improvements:

  • Additional air passages in crankcase for reduced pumping losses


  • Stronger connecting rods
  • New crankshaft with more counterbalance weight
  • Revised pistons with more valve-piston clearance

04 TSX and 06 TSX comparison

This compares a stock 06 MT TSX with a stock 04 MT TSX. Both cars had less than 1000 miles at the time of the dyno. As you can see differences are mainly at the top end on the high cam. On the high cam, the 06 generates about 15HP more

Lets compare an 06 MT TSX with reflash to an 04 TSX with reflash, intake and header.

- Blue line 06 TSX with reflash

- Yellow line 04 TSX with reflash, intake and header

As you can see the 06 just with the reflash is equivalent to 04 + header + intake. Thus an intake and header on the 06 will put it much further ahead of the 04 TSX. See above for an 06 MT TSX with intake.

The TSX uses adaptive knock control. This means it will listen to the knock sensor and advance or retard the timing appropriately. This is good as it means the TSX will readily adapt to higher octane fuel and add a couple of degrees ignition advance. The TSX ECU only takes 3 or 4 power runs to adapt, and is constantly relearning. Unfortunately the side effect is that successive power runs can vary by up to 4-5 ft pounds of torque due to engine noise or knocking that is inaudible to the ear. If your coolant temperatures are too hot (>195 F) or the engine is hot from dyno runs, the ECU has a tendency to retard the timing.

All NA K24 engines we have tuned drop sharply in torque after 6000 rpm - even the 270 hp full race engines. This is a function of the long stroke of the K24 engine. The best way to change the shape of the torque curve is to improve the cylinder filling above 6000 rpm with forced induction - such as supercharging in this comparison with a supercharged K20A3 Civic

The intakes on the K series engines get very hot. They have a metal intake gasket which transfers heat from the head very quickly and are heated by hot air from sitting right behind right the radiator . Pay lots of attention to keeping everything cool and you will see results. The K24 Hondata intake gasket reduces intake temps about 15-40 degrees F. Use a cold air intake where possible.


Copyright 2015 Hondata, Inc. All rights reserved. Warranty Information
Products not legal for sale or use in California on any pollution controlled motor vehicles.