Applications

• US 06-09 Civic Si with K20Z3 engine ECU part number RRB-A04 through A14 with CT supercharger

This stage 2 reflash is only available through CT-Engineering and requires the use of their fuel injectors and Fuel pressure regulator modification.

Optionally you may choose to wait and upgrade towards the FlashPro in June

Part number

• K20Z3-CT Stage 2 ECU flash program 3200 VTEC 8500 rpm REV limit

2006 Civic Si with stock header, catalytic converter and CT Engineering Supercharger

The following dyno chart is for an 06 Civic Si with:

• CT Engineering Supercharger for 06-09 Civic Si
• Intake
• Stock header
• Stock cat
• Comptech catback

• Green ---- line is 3.15 pulley
• Red ---- line is 3.3 pulley

2006 Civic Si with race header, high flow catalytic converter and CT supercharger

The following dyno chart is for an 06 Civic Si with:

• CT Engineering Supercharger for 06-09 Civic Si
• Intake
• Race header
• High flow cat
• Catback

• Blue ---- line is 3.15 pulley
• Red ---- line is 3.3 pulley
• Green ---- line is 3.6 pulley

Boost levels

Details

The K20Z3-CT Supercharger reflash lowers the VTEC point to 3200 rpm, advances the cam angle and raises the rev limit to 8500 rpm.

This single reflash works seamlessly with the 3.6, 3.3 and 3.15 pulleys. You must have an intake as the vacuum pulled by the supercharger with a stock airbox will collapse the rubber intake piping.

We have implemented a VTEC window from 3200 rpm to 6000 rpm.

• Below 3200 rpm the K20Z3 is always on the low cam
• Above 6000 rpm the K20Z3 is always on the high cam
• Between 3200 rpm and 6000 rpm the K20Z3 is on the low cam at part throttle switching to the high cam when on boost. (at higher altitude and with the 3.6 pulley, VTEC may activate a few hundred RPM higher)

This one reflash will work well with a variety of aftermarket performance parts. It will work well with:

• An intake
• Cat-backs (as long as they are less restrictive than stock)
• A race header *
• A combination of intake and race header

Depending on your breathing improvements, you should expect to see a 50% increase in power over a stock Civic Si. On this dyno a stock Civic Si makes about 185-190 HP. Dynos vary tremendously in measured power. A stock, factory rated 200 HP Civic Si can have measured power from 150-200 HP depending on dyno type and settings. The relevant thing is to look for percentage gain from stock at a given RPM as this will be consistent from dyno to dyno. 

(*Note that most race headers eliminate the catalytic converter and will generate a check engine light. This engine check light is for emissions and will not affect the car's performance. Race headers are for off-road use only)

How does the Stage 2 differ from stage 1?

This is a complete ground up rewrite of the program with different software. The higher fuel flow of the CT injectors allows for a higher rev limit and higher levels of boost. Considerable work has gone into partial throttle operation. The VTEC transition point is lower and smoother and the transition to partial throttle to boost is much smoother. Fueling for race headers was also tested.

Due to this program change and the software used, the oil life indicator no longer works and will always display 100%. You will need to base your oil changes on miles and time since your last oil change.

• Red ---- line is Stage 1 with 3.6 pulley
• Green ---- line is Stage 2 with 3.15 pulley

In this example, the gains were 21 ft lbs torque and 32 hp. Your gains will vary according to your intake and exhaust. The dyno charts earlier on this page are from a Dynapack dyno that measures around 8-9% more than the Xact dyno.

Thanks to Xact Dyno, Arizona for the chart.

Modifications

Race header / Test pipe. This will eventually give you an engine check light telling you that you have a faulty catalytic converter. We have not seen this error cause any power loss. Race headers are for off-road use only.

• Aftermarket cams have not been tested and are not recommended.
• Nitrous has not been tested and is not recommended.

There will be variations between cars in fuel pressure, intakes and exhausts. Some bolt on parts work well and some do not. We strongly recommend you dyno to check your boost level, power and AF ratio. For consistency in dyno testing we suggest you follow the dyno procedure outlined here.

• Restrictive exhausts and clogged / melted catalytic converters will increase boost and decrease power
• A stock air-box and/or hot air intake will lower boost and decrease power.
  

How do I purchase the reflash?

Hondata does not sell this upgrade. This reflash is sold along with injectors and pulley from CT-Engineering.

Unlike reflashes for other Honda models you will not need to send the key and immobilizer just the ECU. All ECUs must be sent to Hondata for reprogramming and must include documentation from CT-Engineering with their supercharger serial number. No Hondata dealer has the equipment to reprogram this ECU.

How do I remove my ECU?

The ECU is located under a plastic cover to the right of the battery under the hood. You will need a 10mm socket. This is what it looks like - in place and removed from the car.  There are 3 bolts holding the ecu in.  You may find it easier to completely remove the battery, but you will need to enter the codes for your radio if you do this.

How long does it take to get my ECU back?

Turnaround is 1-2 business days.

Can a Honda dealership erase my Stage 2 reflash?

No.

Should I upgrade my fuel pump?

Our testing showed no drop off in fuel pressure or leaning out at the highest power levels with the stock pump. However we do recommend you dyno to measure your air fuel ratio and measure your fuel pressure under boost as we have seen variations from car to car.

Will this affect my warranty?

Any increase in RPM limit is at your own risk. If you suffer engine damage that is related to excessive revs Honda will not cover your warranty. Valve-piston contact, which typically occurs at 10,000 RPM is the result of a miss-shift.

With regard to aftermarket parts, the law is that warranty coverage cannot be denied simply because such parts are present on the vehicle, or have been used. For more details read the K series FAQ.