Hi all, thought you’d like to see my xmas project and hopefully it’ll be useful to other people. As a firm believer in open source, here is my journey so far.
Background:
My car is Honda swapped S2 Elise (an impostor on these pages I know!) what was running an Omex 710 ECU, however it was slightly lumpy when cold and didn’t have great power delivery. After reading around the VTC application was called into question; A suspicion that was reinforced when I stripped the braid off the loom to find the cam sensors were not wired in.
The success stories for this ECU on the K20 were mapped by the manufacturer however unfortunately they don’t map customer cars any more and the documentation doesn’t cover the variable valve control. I couldn’t find anyone I had confidence in (ie worked on a K20 in the last 6 months) who would hook the VTC up and map the car. The two tuners recommended couldn’t articulate how they’d addressed VTC and weren’t what you could call honda specialists.
Parting comment on the Omex 710 is that I am sure in the right hands it could run the K20 just fine, however support is thin when compared with Hondata & the user community around it. I’ll leave my thanks until the end, however I will say now that Scuffers & Sam@TDi are a wealth of knowledge who convinced me Hondata’d OE was the way forward for my application (bolt on mods only).
Baseline:
So over the TDI for a baseline run to see what I was starting with. Very impressive outfit and was amazed how undramatic runs on their dyno are (a good thing IMO).
Bolted up and getting ready to run:
Hub dyno:
Straight to the hubs and supports the cars weight
Baseline dyno plot:
Torque is a little bit of a rollercoaster, however 200@hubs isnt bad power for a stock honda exhaust manifold.
Figuring out the wiring:
Removed the old loom and devised the wiring diagram for new hondata to chassis loom:
Fairly simple to work out really and soon had a test loom (changed since this pic):
I also replaced the O2 sensor as one on car was unknown quality and only 3 wire to the 4 wire the ECu expects
Hooked it up and fired up first time! Settled in a low and smooth idle.
Final install:
Once I was 100% happy I sealed it up with tubing and self amalgamating tape.
Have also wired the K-Line to a bluetooth OBD2 adaptor so I can could check DTCs and coolant temp until I have the dash working with the honda sensors (without the rover ECU).
First impressions:
Paul @ TDi North installed a conservative map on the car to get me going. However first impressions are that it’s much smoother and linear with better control of the VTEC changeover when cruising on the motorway.
Next steps:
Get my scuffers manifold on and then over to Chris Tullet for a SDCP and back box. Then book it in with TDi South for a mapping session.
Also I have a solution got the coolant on the stock dash, and i’ll post that up later. Will also update the thread as I sort the next stages. 
Thanks:
- Scuffers for taking the time with me on the phone and supplying me the E & C101 along with a loverly 4-1 manifold.
- Arno for helping me with the digging on the stock loom
- TDi South for the advice around VTC and mapping.
- TDi North for modding the ECU and putting a suitable base on the K100.
Costs so far:
-�650 for Omex 710 (yay ebay)
�500 for Hondata
�150 for PRA ECU
�100 for loom
�100~ in pins, tools and bits n bobs
We should organise that meet up we were talking about…