MOTIV RE|FLEX - ADVANCED I/O INTEGRATION

[mj6234]

AFR is simply more bouncy when under low load, it's not just pure DI, it's that you're under decent load once your PI turns on.

STFT is a good way to go. 1.1 vs 1.4 is a good staring place, but adjust as needed. running mid to high 15's for gas equivalent lambda during low load for highway is decent way to get 10% MPG back on E85, plus more advanced timing than you run WOT. Be careful with your HPFP pressure in the 2500-3000 RPM range, the pump is not spinning fast enough to keep up with as much load as later RPM, so make sure you have PI in there if you see your high end pressure sagging as that's a sign you're reaching max possible fuel delivery with DI.

The closer you get to proper fuel added with PI and scalar at a given load/rpm, the less the STFT will need to adjust, and thus the smoother your AFR will stay rather than bouncing around. Might also check your spark gap, AFR will bounce around like that if you're breaking up.

I will keep at it. My pulls have felt smooth, minus a throttle closure right after initial boost target is reached. I did turn on PI in the 2500-3000 range in my later updates. Rail pressure looks good. I also wasnt sure if people tried to run pump gas 95% on DI and really only have PI cut on at higher loads/higher E% or if it gets blended into normal pump gas operation (I am chasing the latter). I havent messed much with cars with factory DI/PI systems, but wasnt sure what the factory philosophy was. I feel like once PI is installed, it is 'expected' to work and any kind of failure should go to limp mode - just like a DI injector failing would (even though DI only on pump gas is more than adequate from a fuel supply only perspective).

 

[ssand614]

How exactly do i wire my secondary fuel pump to reflex plus aux 2?

 

[browiththefro]

I’m having the same issue since 6 month i have B58 coils i will try your solution of routing the wire back away as i can in the firewall and hopefully that would help as mine spike and fluctuating really high

Have you managed to fix these issues? I'm also on B58 coils, and attempted to move the wire behind the shroud of the firewall, but this didn't fix the issue. I'm also grounded to the strut tower.

 

[turbohugh]

did you ever figure this out? I'm having a similar issue but all I get is MHD-001, no twitching.

For me my issue was a dead Motiv box. It was eventually replaced by Jake under warranty. The key indicator was it not going into firmware update mode. As far as the msd-001 error, that's canbus . Your canbus wires need to be spliced into place. Using the wire-taps is very difficult to get correct, and it will eventually cause spontaneous errors . If you're not good at splicing 16-18 gauge wires get someone who is good with it to do it for you. Takes about an hour to do it correctly. Someone suggested solder and heat-shrink; which is the route I've gone. Using flux it was super easy and now I never get any spikes or connectivity errors. Also make sure you route your sensor wires and canbus wires away from any emi sources. Good luck . Sorry for such a delay and hope you've fixed your issue.