Another S/C'd member worried about his AFR

[LtNoogie]

Originally Posted by jkuchta

Adding a little more pressure to the injectors shouldn't be a problem, and would be a good way to add a little more fuel.

The problem is the pump itself and the type of fuel system we have.

The fuel system is a returnless system...which means that fuel pressure changes are brought about by speeding up or slowing down the pump. To add a boost-referanced regulator you'd need to not only boost the pump pressure up over what the max fuel pressure would be, but you would also need to add a fuel return line back to the tank.

This is not impossible, but is a little work.

What someone ought to do is referance the pump voltage to the boost pressure. If it's not too taxing on the pump, that solution might circumvent the need for a return line. I have no idea what the ECU would have to say about that though.

I need to search the service manual to see if it gives the output fuel pressure of the OEM pump.

Originally Posted by PETERPOOP

The thought of slightly larger injectors seems to be worth trying. I just got my 1zz throttle body in the mail that I ordered weeks ago. I'll wait to put that on later.

Like I said, someone should try one method and I'll try another. But Peter, you've got to get some instrumentation so that you can see a before and after reading. No more butt dyno. We now know yours measures too high.

[PETERPOOP]

Originally Posted by LtNoogie

I need to search the service manual to see if it gives the output fuel pressure of the OEM pump.



Like I said, someone should try one method and I'll try another. But Peter, you've got to get some instrumentation so that you can see a before and after reading. No more butt dyno. We now know yours measures too high.

My butt is too sensative I guess. I will have the scangauge II soon. I am willing to try the larger injectors. What about a combination of slightly larger injectors and the 1zz tb?