piggyback ECU, open/closed loop and WI?

[Richard L]

Originally Posted by avendit

Hi,

I have a latest generation toyota celica with an added turbo, running 12PSI of boost. I'm using a Greddy Emanage blue for tuning the extra fuel. The car runs great at WOT (244bhp) where it is in open loop and I have full control over the fueling, however because I'm using a piggy back I can be in the situation where I'm in closed loop, the car is aiming for 14.7:1 but I'm at 6-8 PSI :shock: . This results in timing being noticeably pulled by the ECU.

So I was thinking that some WI to make that part throttle closed loop situation safer (not too bothered about max power, pretty much there as far as conrods and stuff can take it - I just want to make it safe at part throttle). What effect would WI have on the closed loop function of the toyota ECU that constantly aims for 14.7:1?

And as a piggy back question - the emanage blue can control an additional injector, would this would be an acceptable way to control water input? I tune against MAP already so the water injection map should be easy to design :smile: .

Thanks in advance,
Avendit

If your fuel system targets 14.7:1 AFR, put in another injector will not help. The main ECU just trim the fuel IDC to retain the same AFR. This is a good opportunity to add water injection where it does not affect your target afr at cruising but offers a great deal of safety. IDC mirroring system is ideal system for this application where you need a wide dynamic range.