PowerTRONIC ICU
This post reports fitting a PowerTRONIC ICU (ignition control unit) to an Oct 2019 Interceptor
Summary
- Difficult to fit
- Performance gain not quantified. Max RPM not changed
- Decided against using it
I fitted the
PowerTRONIC ICU because
- Engine was knocking/pinking/pre-detonating with the existing EMS (engine management system)
- More performance. Review: https://www.drivespark.com/two-wheel...es-028802.html
- Three different stock ICUs on a Unicorn 150 had shown significantly different engine characteristics
- Curiosity
The ICU was ordered from
https://powertronicecu.com for a delivered price of ₹22,000 incl tax
The ICU parts fitted to the bike add 1.2 kg
Nothing is removed from the bike when fitting the ICU except two relays are replaced. The ICU cables intercept the original cables. This allows the ICU's "brain" to be replaced by the "stock coupler" so the bike works as it did from the factory. Can be used for legal compliance and in case the PowerTRONIC fails
After downloading the many and comprehensive manuals in preparation for fitting I found the ICU had an O2 sensor cable which was not mentioned in the manuals. PowerTRONIC technical support responded quickly and clearly. The cable was present on early model ICUs. The manual was for later model ICUs. The cable should not be used
Fitting went well until it came to fitting the "coil modulators". The manual had detailed every step but did not say the toolbox bracket must be removed to fit a modulator from the right. No biggy. The biggy was the modulators would rest on the battery with nothing to hold them in place. They would move. Moving, they would rattle and rub against the wiring harness support bracket and the top of the battery. PowerTRONIC technical support responded quickly saying the modulators had lugs with holes that should be used with cable ties for support.
After enlarging the holes to accept the cable ties supplied in the ICU kit I was able to tie the RHS modulator to the frame but there was no way to fit the LHS
Seven cables ties are supplied with the kit. I needed longer ties and more of them, say 20
PowerTRONIC technical support suggested wrapping the modulator(s) in bubble wrap and putting them on top of the battery. I was reluctant to do that because of concerns about battery ventilation and bubble wrap durability.
Finally I ended up tying the LHS modulator to the wiring harness.
Not great, using the wiring harness to fix anything but this part of the harness is heavy and most of the modulator weight is supported by cable tie to the frame so I expect it will be OK
When re-fittting the petrol tank, I had to re-route all the ICU cables to clear the petrol pump. From the factory there are a lot of cables under the tank. Adding the ICU cables leaves very little space. Ingenuity and patience required.
The manual says "You can keep the tool box under the seat". The only place the tool roll almost fits is on top of the original ECU (electronic control unit) but the seat would not stay down. The workshop manual says "DO NOT keep any heavy or sharp objects on ECU as it will damage internals and render the ECU defective". The tools are next to useless to fix breakdowns anyway so I left them off the bike and stored the stock coupler there (the manual suggests storing it in the glove box!)
When checking the throttle calibration, the manual says starting the engine is optional but the accompanying screenshot says it is required. PowerTRONIC technical support confirmed it is optional
The R-tune software showed that a "map" sets the air/fuel ratio and the spark timing
Phew! Fitting completed. How did it perform? Subjectively it felt faster and there was a noticeable difference between "Race mode" and "Race+ mode". Sorry -- I can't say more than that because I do not have stretches of road which I regularly use for performance testing
After trying the ICU for say 30 km, the exhaust outlets were much blacker than they were.
After fitting the "stock coupler" to revert to the factory system to better know how different the ICU was, the engine ran more sweetly and smoothly. In combination with the black exhaust outlets and knowing that the ICU simply changes air/fuel ratio and spark timing, I reflected that the ICU gives better performance than the factory because it is not constrained by emissions considerations. My marginal enjoyment of a slightly faster bike would come at the cost of more pollution.
So I decided to continue with the "stock coupler", to stay with the factory system. At least I got two upgraded relays for ₹22,000 and 1.2kg!