Openecu as primary EMS with utec as secondary?

[Brian]

Instead of using the utec for just about everything, now I'm hoping to use openecu for my main tune and then use the UTEC for logging, tuning for race gas etc. .

What is the best way of going about this?

I'm assuming take the UTEC switch it to map 0 so it's not using any map, turn off open loop fueling. What other than that would need to be done in order to tune the stock ecu correctly?


I'd rather avoid taking the UTEC out and using openecu, but if need be then I'll do that and add the UTEC after the tune.
Thanks
BH

[dubbleugly01]

I'm assuming by openecu, you mean EcuFlash?

That's exactly how I'm running my setup. If you set your Utec to map 0, you'll be running straight off the factory ECU, and you can tune via EcuFlash. Get your base map for whatever driving conditions you want to call "normal", and then use the Utec for alternate maps for say race gas, alky, road course tune, strip tune, etc.

I've had several custom "tuner" flashes who advertise here on evom, and none of them have said the Utec will interfere with the tune when in map 0.

Open loop fueling needs to be off, obviously, but the injector scaling feature in EcuFlash works sooooo much better anyway.

[Ultimate CC]

i run the same way, ecuflash for pump gas and then the UTEC for the rest...

[Brian]

Dubbleugly01: Yeah I meant EcuFlash.



I'm pleased to see this is going to be this easy, thanks for the responses.

[MalibuJack]

I do the same thing..

There are several things you need to keep in mind when setting up the UTEC to coexist with the ECUFlash stuff though.

In General, you do everything the same. The exception is when you have larger than stock injectors, and/or you need to retain the stock launch control feature in ECUFlash.

What I did on my setup was:

Base Tune with ECUFlash, stock boost control at low boost (15psi on a GT35r) Conservative fuel and timing maps that run well and are properly scaled for 1000cc injectors, adjusted Idle quality and speed and all the stuff that works really well with the stock ECU.

Now I have a baseline that will pass a NY State inspection, and run in passthrough mode, additionally I can remove the UTEC without harming anything if I needed to. This is CRITICAL when you deal with this stuff.

On the UTEC, I disabled Open Loop Fueling, I no longer needed the features it offered (Override Rev Limiter or Fuel cut, since ECUFlash took care of it) So I used MAF offset mode (which is stock) I did this to eliminate the transition hiccup, but also the Issues with Injector Scaling that are somewhat difficult to deal with on the UTEC. Scaling values are left "Stock" in the UTEC.

Now I have a perrin EBCS instead of a stock solenoid, I can control this over the stock values using the UTEC, I have direct timing control to override the ECU ONLY in areas that need to be adjusted, this is another huge advantage with a proper base flash as you no longer get hiccups on transitions. Fuel control is now handled by adding or decreasing the MAF signal, but now that the ECU is properly adjusted for MAF scale, you still have about +/-50% offset to work with, and you only need to make adjustments in areas that need work, and not the entire map..

Flat shifting now works properly, as you can use the ECU Standing rev limit for launch, and a higher RPM for flat shifting in the UTEC. I have 3 RPM operated outputs, and 1 relay output for my lights and other accessories, I can switch between several maps (E85 anyone?) And I have smooth transitions. Additionally I don't need to reflash my ECU constantly and I have control over how to handle knock at high loads.

FWIW I still prefer the ECU+ Especially now along side the ability to reflash the stock ECU, but I do need multiple maps and external boost control without additional components under the hood so I put the UTEC back in for the time being.