perhaps you can tweak a recently discovered fuel pump voltage switch table?

https://www.evolutionm.net/forums/ec...ion-table.html

 

A DW301 on factory wiring will not overrun the factory FPR. With a high voltage-only rewire (what everyone sells right now), it will majorly overrun the factory FPR at idle. (So will a Walbro 255.) If you did a high voltage only rewire, your options are an aftermarket FPR or to do a rewire that preserves the low/high voltage circuit such as:

https://www.evolutionm.net/forums/ev...e-circuit.html

Only works with stock wiring or a rewire that preserves the low/high voltage transition (no kits currently offer this).

 

I'm on stock wiring. My fuel trims at idle are -12.5% and my mid fuel trims are +/- 2%. On both e85 and 93 octane.

I used your scaling/latency settings as a starting point for e85 and ended up not having to change anything. Just have the idle issue which I think is the pump over running the stock fpr.

 

I tried a DW301 on stock fuel pump wiring on my Evo, and it definitely doesn't overrun the stock FPR at idle. Fuel pressures were exactly where they were supposed to be.

 

Well, I have my injectors scaled to 1000 CC on 93 octane, using your latency settings. My long term low trims are -12.5 and my long term mid trims are +/- 3. I'm going to try raising scaling to 1100 CC to see if it helps.

 

Latency needs to change more than the scaling. Latency needs to go down a bunch, maybe 0.075 ms.

 

Ok cool, thanks for the tip. Should I reset fuel trims every time I make a change, or just wait for it to change on it's own?

 

I changed the 14.08v latency from 1.128ms to 1.056ms and it did the trick.

 

 

Excuse me I have theses Injectors.. I would like to know what would be the cons of installing injectors w/proper scaling and latencies without any further tuning( timing & fuel maps etc)

 

After the injector latencies and scaling are tuned properly your open loop maps should be very close. Mine were.

 

so I should be able to cruise and idle but not boost ?

 

Depends on what injector size you are coming from. Cruise and idle should be fine thou.

 

coming from stock

 

If your scaling and latencies are tuned well, your open loop maps should be very close. I went from stock injectors to these injectors and mine were very close.