BalladeSports

BalladeSports

Just finished a dyno Ap2 stock engine 04 S2k. 115k miles on it. In mid range made about 37 whp difference from Vtec coming on at 4800rpms vs 6k rpms. Sorry the RPM reading was acting up so we had to put the graph on Speed at the bottom.

206whp peak to 221whp.

This car has intake and exhaust. SAE corrected. So no fake high reading numbers on a DynoJet.

solos2k

Weird question but could the RSX ecu be put into an S2000 casing? You could solve a lot of problems for the 2000-2005 s2000 owners who race in SCCA STR class if you could make that happen.

BalladeSports

^ I will try today.

solos2k

Interested to hear results.

BalladeSports

^Sorry,

It wont really fit without modifying the ECU case and then runs the problem of getting S2k cases. Were someone willing to buy the Doctronics ECU and retrofit it themselves into a S2k case is up to them. As for the SCCA cars you would still see a jumper harness coming out of the ECU so I don't know if you can still get away with that for the regulations.

solos2k

F. The engine management system parameters and operation of internalcombustion engines may be modified only via the methods listed below.These allowances also apply to forced induction cars, except thatno changes to standard boost levels, intercoolers, or boost controls arepermitted. Boost changes indirectly resulting from allowed modificationsare permissible but directly altering or modifying the boost orturbo controls, either mechanically or electronically, is strictly prohibited.Traction control parameters may not be altered. Any OE OBD2 ornewer communications port functionality must remain. The Check EngineLight (CEL) or Malfunction Indicator Light (MIL) may be disabledvia software. Alternate software maps which violate these restrictionsmay not be present during competition, regardless of activation. OnlyOE sensors may be used for engine management.1. Reprogrammed ECU/PCM (via hardware and/or software) may beused in the standard housing.2. Supplementary (“Piggyback”) ECU may be used subject to the followingrestrictions:a. Connects between the standard ECU/PCM and its wiring harnessonly.b. Must be plug-compatible with the standard ECU/PCM (no splices).3. Electronic components may be installed in-line between an engine’ssensors and ECU/PCM. These components may alter the signal comingfrom the sensor in order to affect the ECU/PCM operation of enginemanagement system. Example: Fuel controllers that modify thesignal coming from an airflow sensor.4. Fuel pressure regulators may be replaced in lieu of electronic alterationsto the fuel system. It is not permitted to electronically modifythe fuel system AND replace a fuel pressure regulator.5. Ignition timing may be set at any point on factory adjustable distributorignition systems.6. VTEC controllers and other devices may be used which alter the timingof factory standard electronic variable valve timing systems.


I think the jumper harness would be fine.

HMFIC

Out of curiosity. If you're boosted. And you want to pass emissions. You said the OBD 2 works, and you simply plug the harness back for smog. Doesn't that put the OEM ecu back without the tune that runs the now modified setup. IE injectors etc? How does the car run now with stock ecu? Or does that not even happen.

Please elaborate.

davidc1

Yes, you are correct. There are basically several considerations for passing emissions depending on what state you are in.

If the state simply reads the OBD output, like CA is now, you will likely pass.

If the state requires a visual check, they of course you will fail as they see your modified engine.

If the state does a tailpipe emissions test, you will fail as well because as you said, the different injectors will be controlled by the stock ECU and probably won't be spraying the correct amount of fuel to meet emissions.

stphotographer

This is great! Subscribed!