Personally, I wouldn't trust rockauto to get you an authentic fuel pump. They have cheaper prices for a reason.

 

I figured their cheaper prices are due to their business model and significantly less overhead costs than brick and mortar stores.

But anyway, I just remembered, awhile back I bought an FD Denso pump kit from them, came in the full box, etc. The original use was to be for a Turbo II project. My FD ended up having a fuel issue due to a cracked o ring in the pump assembly and since I had that kit, I had it installed. What I didn't know at the time was that apparently the FD and TT Supra Denso pumps are the same now. What I don't know is when this changeover happened, and if like I mentioned previously, if they upgraded the FD pump or downgraded the TT Supra pump. Or if I even have one that shares the same part number. It was bought probably in 2017 or possibly 2018.

All I can say is, my PFC shows my injector duty cycle at 82% at WoT in third gear with a downpipe, resonated midpipe, and racing beat catback.

Does this mean I have a Supra TT Pump already? No idea. I guess a more appropriate question would be is it normal to see those duty cycles with the mods I have and would it be higher if I were running the stock FD pump?

 

The questions you have I don’t have the answers for. It’s like the walbro pump, you have to buy from a reputable dealer. I bought my supra pump directly from Toyota. There are a couple forum vendors that sell them as well.

If you’re seeing 82% max inj duty with the pump you have installed, I wouldn’t bat an eye.

~ GW

 

at some point Denso went from 2 pumps, to one pump for both cars, and since it is a new number we have no idea how it performs. its $$ too

 

at what mixture? what boost? have you changed the fuel filterS?
82% is actually a bit low, i remember back in the day my FD ran 99% duty at 11psi, and it was the stock map! my current car, the FC-REW is running 73% duty at 11:1 afr and 7 psi

 

What do you mean by mixture?

Fuel filter has been changed, pump sock/strainer is new. My peak boost goes about as high as .82 Kgf/Cm^2, so a hair above 11.5 psi. I have no idea what map is on the car, as it's running the same map that was on it from Japan. No idea if that is a base map or what.

But to somewhat answer my question about earlier, and raise even more:

I looked up the part number of the Denso fuel pump kit I got from RockAuto a few years back. The pump was bought in 2018 and the part number is 9500159.

Looking at RockAuto now, the Denso pump listed for the Supra TT is 9510014.

The FD, however, has two denso pumps listed.

The first Denso listed is more of a "kit" and comes with the strainer, etc. This one carries the 9500159 part number that I purchased back then, and it has the same parts, so it would stand to reason that's what I ordered a few years ago.

The second Denso listed seems to have everything the first one has, except no strainer. That one does share the same part number of the Supra, 9510014, which lists the Toyota part number, which cross references directly to the Supra TT, 2322146110. If you look up the Denso pump under the TT Supra, it lists the FD part number as a cross reference.

So this raises many questions, do I have a TT pump, and the reason the part number differs is because mine was the kit w/strainer? Or are the single pumps that share part numbers between the FD and Supra the upgraded Supra pumps people install? I know it was just mentioned that they went from two pumps to one at some point.

I guess the real question is, if I had a stock FD pump, and not one that is questionable in terms of is it an FD or Supra TT pump since Denso went down to one pump, would I be seeing 82% max Inj duty cycle with my mods, or should it be higher?

It looks like based on what everyone has mentioned, that's actually low. (Though I'm surprised because I always thought 85% was the number you didn't want to cross for reliability sake).

 

oh so if you have .8kg cm at 6000rpm and 10:1 afr it is going to be running a higher duty cycle than if you were .8kgcm at 6000rpm and 11:1 afr (the base map target AFR in that cell is 10.4:1)

the PFC runs open loop, so in that cell; 6000rpm and .8kg, it will always run the same injector duty no matter what fuel pump is in there. the afr may change with different pumps, but that would be a pressure/flow difference of the pump.

 

Gotcha, I had a feeling you were referencing afr, but rather than assume, I wanted to ask.

I have no idea if I'm running a basemap or a tuned map, Ideally I'll find that out this week when I take the car to Pettit.

But that has me curious, you mentioned in your past post you were at 99%~ at 11psi, and that my 82% was rather low. Could that be related entirely to tune, or do you think there must be some fuel system upgrades involved? Or is the car just tuned to run lean if the injectors are only at 82% max?

 

There are too many variables to speculate. The AFR mixture could be different, or the AFR mixture could be the same but something else might be different like the fuel itself, or fuel pressure, or wiring to the fuel pump, or engine airflow, or intake/exhaust/cat airflow, or even the wideband O2 sensor or the gauge interpreting its data.

 

Yes that is what I was referring to. I didn't want to have to return it back to stock. Thanks!