Hondata Kpro with RSX Wideband Update

When I had my car running on ITBs, it was running super rich, this probably lead to the demise of my RSX wideband sensor which is not working anymore, but all my other sensors are working perfectly, i.e ECT, Gas, and Etc.  I’m not giving up on the rsx wideband yet!  I took apart my kpro, and found this surprise:


Just lik eon the s2ki kpro thread, the A1 is jumped to D8 to ground out the extra voltage.  Hondata denied preforming this mod, I guess when I sent my ecu in to get repaired, they went ahead and did this for me without me asking.  Hopefully my wideband still works, I’m going to go ahead and re-do my wiring, and go back to the original diagram, with all new wires, connectors, and minimal solder.


I’ll keep you guys updated!

Life: New stuff

My summer classes are finally coming to an end…..well the harder ones at least. I need to start looking for a real job, since I’ll hopefully will be done with classes soon.  I tried the alternate diagram and it seems to work well.  The relay chatter was driving me crazy.  I couldn’t hear my turn signals over it! I made the plunge and bought this solid state relay from Hella.  Hybridsol on s2ki helped me wire it up and it seems to be going strong, so far at least.

I’ve also been working on my friend’s SR20’ed 240sx, which he recently bought. It has a huge ass leak at the exhaust manifold to turbo gasket.  We got it off and broke a bolt off at the turbo to elbow section.  We said F it and dropped it off a machine shop to be taken out. We finally picked it up and a used Tomei expreme elbow. Hopefully everything goes as planned and we can get it in without breaking anymore bolts.


it looks like there is a burned track on my kpro, I hope it’s just the surface……Getting it checked out later this week, I just need to find a person who specializes on circuit boards.  Maybe run stock narrow band after this?


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
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!!!!