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Discussion Starter · #22 ·
So I solved the issue of leaning out. The stock injectors were maxing out so I swapped a set of 2001 Camry 2.2 injectors In to it. And I have no more issues
 

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So I solved the issue of leaning out. The stock injectors were maxing out so I swapped a set of 2001 Camry 2.2 injectors In to it. And I have no more issues
Keep an eye on your fuel trims at part throttle. It might be running way rich, at least until the ECU develops its long-term trim (which restarts every time you start the car).
 

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Long term fuel trims should not be resetting every time you start the car, your short term trims do though. If long term trims are resetting every time you power off your car is wired wrong.

From my memory, when I had the stock ecu and an FMU my AFR was terribly inconsistent all the time. I also remember my car not going into open loop when it should have as well though, often targeting 14.7 while in boost. In hind sight there may have been some other issues at play with all of that though.

As to just dropping in the Camry injectors and sending it, you're going to get a CEL after a little while. The ECU will get mad that you're short term fuel trims are maxed out. I don't remember if that really affects anything though. I do remember that my AFR's were pretty spot on when in boost though.

I'd love to be able to have a stock car to play with now days with how much more I know now days...
 

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Just something to add. Right now I am running with an FMU and have decent control of the AFRs. From my fuel system testing the problem isn't the computer taking fuel away (as it actually tries to maintain a 12.5 AFR under WOT) but actually the inability of the stock fuel system to deliver fuel pressure in excess of 50 psi. I tested this on my car by connecting a fuel pressure gauge to the rail then kinking the return line. To get around this I have a second fuel pump in series with the fuel feed that kicks in under boost. With this setup I can get up to 140 psi in my fuel rail with the FMU, so it's able to provide adequate fuel enrichment for up to 8psi of boost. All this has been observed from the OBD C&C, but I'm not sure I trust that anymore (I had an incident where the line to my FMU was disconnected and I remember reading ok AFRs even though it seemed to be leaning out bad) I'll be putting an additional wideband in soon so I'll report back on this.

The setup looks super janky with the fuel pump from a 90s volvo sitting over the valve cover but it has been working for me. Although right now I'm working on modifying a Speeduino to take over control of fuel and spark while retaining IMA, as I'd like to be able to retard the ignition timing and have full control of my injectors to get the most out of my setup, maybe even run E85 flex fuel!

90633


- Jack
 
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