Hi,

I've done searches, and looked through dozens of pages of the STR prep data, and not found the answer to this. Sometimes, there can be too much information.

I have owned a 2004 S2000 from new, for a bit over ten years. I'm thinking of converting it from BS to STR, but I'm wondering whether the 2004 ECU has been cracked.

Can someone answer that specific question, and the more general one: Is there any reason why a 2004 wouldn't make a good STR donor car?

Thanks!

 

The car I won in 2013 was an 05' w/ greddy emanage + ap1 ecu in ap2 case

 

If you're running STR, you'll have to run a piggyback. The drop in replacement options are class illegal.

 

The easy button is to talk with Karcepts (aka Brian Karwan). He runs an '04 in STR, and has a turn-key piggyback solution for you. I run one of his set ups in my '02 and it works flawlessly.

 

VAFCII or emanage.

 

I haven't read the STR rules in a while, but I thought that a piggyback had to fit inside the stock ECU case or something stupid like that. Has that been relaxed?

 

It may have been relaxed (haven't read older versions), but the drop in options have to sit where the stock ECU goes and fit in the stock housing, piggy backs have to work by way of a plug in adapter, you can't splice the stock harness.

2014 Rules for Street Touring on Engine Management:

The engine management system parameters and operation may be modified only via the methods listed below. These allowances also
apply to forced induction cars, except that no changes to standard boost levels, intercoolers, or boost controls are permitted. Boost changes indirectly resulting from allowed modifications are permissible but directly altering or modifying the boost or turbo controls,either mechanically or electronically, is strictly prohibited. Traction
control parameters may not be altered. Any OE OBD2 or newer communications port functionality must remain. The Check Engine Light(CEL) or Malfunction Indicator Light (MIL) may be disabled via software. Alternate software maps which violate these restrictions may not be present during competition, regardless of activation. Only OE sensors may be used for engine management.

1. Reprogrammed ECU/PCM (via hardware and/or software) may be
used in the standard housing.
2. Supplementary (“Piggyback”) ECU may be used subject to the
following restrictions:
a. Connects between the standard ECU/PCM and its wiring harness only.
b. Must be plug-compatible with the standard ECU/PCM (no splices).
3. Electronic components may be installed in-line between an engine’s sensors and ECU/PCM. These components may alter the signal coming from the sensor in order to affect the ECU/PCM operation of engine management system. Example: fuel controllers
that modify the signal coming from an airflow sensor.
4. Fuel pressure regulators may be replaced in lieu of electronic alterations to the fuel system. It is not permitted to electronically modify the fuel system AND replace a fuel pressure regulator.
5. Ignition timing may be set at any point on factory adjustable distributor ignition systems.
6. VTEC controllers and other devices may be used which alter thetiming of factory standard electronic variable valve timing systems

 

Well that's a good sign.

Lugod: Why did you use the AP1 ECU in the AP2 case? Why not just use the straight AP2 ECU with eManage?

 

Depending on how much you want to invest and how much time someone want to spend on the fine details, it is possible to use a Haltech, with the plug in harness and utilize the oem ecu to run the obd2 port. I was looking into this before I decided to focus 100% on the SSM build.

-Marc

 

It wasn't my car so I don't have all the details. My speculation was to utilize the higher stock revlimit (9k). At the time I don't believe anyone figured out how to increase the rev count with the stock ap2 ecu in play. Now I believe that has been solved.