:d

can you hook up 52690021 please?
Thx!

Just switched back to pump gas for a tank, forgot to check base fuel pressure, sorry....but the car ran great, no issues what so ever. Ran it down to E twice in a row with the return drilled to 2.8mm or whatever I stated in my last post, no issues at all.

Also, a few weeks back I ended up getting some fuel trim CELs so I tweaked the voltage cutover per mrfred's suggestion and trims are back in check! I highly recommend doing this when installing this pump!

I suspected you might have some issues without adjusting the crossover voltage. Can you post the values you used?

Laptop is dead in the water atm I apologize, but I followed the advice you gave about setting it for 5 over the open-loop settings I had in place. Probably around 80 across the board but I'm sorry I don't remember for sure, I'll get a screenshot when I get it up and running again!

i was a bit puzzled by the 80-ish values you mentioned until i remembered last night that you lowered your open loop load values to deal with the lean tip-in issue. i think you could raise the fuel pump voltage crossover load to be 5 higher than the stock open loop load values.

I had to do the same thing... Is there a different solution rather than lower the OL/CL crossovers and adjusting fueling?

Indeed I did. Maybe I'll raise it even higher but honestly I cannot remember..I'll post my maps as soon as I get a new power cord for my laptop...maybe raise the voltage xover even higher, that's actually not a terrible idea!

ive got mine set to like 140 (openloop is 100)

What RPM is that roughly?

It's not an RPM, it's a load value You can hit it at any rpm depending on how much boost you're hitting and how much throttle you're giving it!

I know its a load value. But at partial throttle you will hit that load value at a certain RPM.

For example, I see 100 load a 3k RPM, partial throttle, every gear. and this is when the ECU trips the FPR for higher voltage. It varies by a few hundred RPM give or take, but for the most part its pretty damn consistant. So, If raised to 150 load, for example, it should be reasonable to guesstimate about 4500 RPM to reach that load value (again partial throttle).

The ECU uses load and TPS to determine when to send the signal that raises pump voltage. So regarldess of Load, if you mash to WOT, you can trigger that fuel pump relay and increase the voltage.

Actually, the ECU does not use TPS to set the fuel pump voltage. Its based on load, coolant temp, and IAT.

The load versus rpm table that is used by the ECU is not really a sensible way to go about controlling the voltage transition. It should be based on fuel flow which scales with both air flow (MAF Hz) or IPW. If it were trigger off MAF Hz, it wouldn't even need to be a 2D table. It could just be a single value that basically says when MAF Hz (fuel flow) exceeds a certain value, then switch to high voltage. Since the ECU uses load, we have to do it differently. Fuel flow is going to be proportional to load*rpm, so as rpm increases, the transition load needs to decrease. At say 2500 rpm, the transition load can be something like 140, but at 7000 rpm, the transition load needs to be around 40. This is essentially the strategy of the open loop load table, so I just follow the trend of that table. Make sense?

Makes sense. Thank you Mr. Fred.