This reflash is for the base RSX with K20A3 engine.

Applications

• K20A3-M1: Revised fuel and ignition values with stock REV limit for 5 speed manual transmission (ECU part number PND A01 through A09).
• K20A3-M2: Revised fuel and ignition values with 7300 REV limit for 5 speed manual transmission (ECU part number PND A01 through A09).

Both these reflashes are based on the performance program in the dyno chart below and vary only by rev limit. VTEC point is not altered.

We do not recommend the use of this reflash with nitrous or forced induction. For these applications we recommend the K-Pro.

Pricing

• US $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.

Details

This test RSX base model had 28,000 miles at the time of testing. Intake and exhaust were stock. The fuel used was 89 octane - but we recommend 91. We cannot turn your base model into a Type S (please read K series Tech), but we can make significant improvements.

K20A3 RSX base model Stock vs Program

• 5-10 HP increase across most of the rev range.
• 10-12 ft/lb torque increase under 5000 rpm
• Rev limiter optionally raised to 7300 RPM
• Passes Californian smog test (no measurable difference from stock).
• Fully dealer compatible - works with all Honda scan tools and equipment.
• More torque than a stock K20A2 Type S under 6300 rpm. (see graph below)

More torque than a stock Type S!

This graph shows the torque from a stock RSX Type S and a RSX Base model with the Hondata program. The Type S had only about 1500 miles and would show more torque after a few thousand more miles.

Comparisons to a cold air intake

Long cold air intakes work the best. The long cold air intake we tested with added 5-6 ft lb across the rev range from 2800 rpm up. By comparison the CAI makes more top end power from about 5500 rpm and up Hondata program makes significantly more torque under 5500 rpm. This graph shows only the CAI with no Hondata program.

In this graph we test the CAI and Hondata program together.

Tech

VTEC

These engines have a VTEC point of 2200 RPM. Under this rpm the K20A3 operates as a 12 valve engine. Hondata does not change this. See K series Tech for more info.

For consistency in dyno testing we suggest you follow the dyno procedure outlined here.

Immobilizer

The immobilizer feature on the US Spec RSX is the most advanced to date. The ignition key, the immobilizer box and the ECU are all matched. It there is not a match there will be no fuel or spark. Japanese ECUs have less protection and are more easily bypassed.

Thanks

To Karen - RSXGirl for providing the stock test vehicle.

Shawn Church Automotive for the Dyno facilities, testing and useful feedback. Shawn has many RSX dyno plots on his Dynapack dyno if you would like to dyno your RSX.