Tech/Review: RSX wideband with Hondata kpro

I’ve had my Hondata Kpro for my s2000 for awhile now. I went with kpro because my car can be ODBII compliant with my ITBs.  No other EMS will allow me to do so. I rate Kpro about 6/10.

This is my grading breakdown:

The Pros:

ODBII compliant
Read engine codes via kpro
User friendly software
Properly updated and maintained

The Cons:

No Wideband! Even though we are using an RSX ecu and have the option for PRB maps
No support for using a RSX wideband
Expensive
Requires additional hardware
ECT readings are funny when car is started up

On S2ki, a user “JustinC”, gave us a wiring diagram allowing us to use a RSX wideband with PRB maps. This allows us to use many features in Kpro we were not able to use with the stock o2 sensor, such as lean cut. This is the wiring diagram he provided:

I wired everything up and its been working well for the most part. Rarely, I get an engine light when I start up my car, saying that the o2 sensor cannot be read. Recently some members with new Kpro unit have been frying their ECUs with this wideband installed.  Hondata blames us, because we are wiring up an unsupported device. A user, “hybridsol”  is trying to remedy this and make improvements to the original diagram, adding a fuse from the 20A battery feed and adding a coil on the relay. I also utilized these changes with my kpro. Unfortunately, even with those improvements his ecu fried. Upon further investigation, it turns out that the ground on the ecu cannot handle the load when the heater is switched on and off. He suggested another diagram to remedy this problem. This is the remedy he is suggesting:

I am going to try this when I get back home from Boston. I’ll keep you guys posted!!!!

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