The richening, Pbanders? Chris Foley? Dirty injectors? 2056 and a strange lean Options

[emerygt350]

Ok, car is running great, but it just wants more fuel than my mps can give. It was almost there before I upgraded to the 2056. I have the mps maxed (inner screw all the way loose, won't go any further). I have the full load stop set at 3inhg and the part load kicking in at 7.5 inhg. I have now been inching up the fuel pressure, at 32 now, but the idles is now so rich it is bothering me.
The ecu idle is full lean.


The fuel injectors are 2 years old fj67s. Pbanders states you should be able to run up to 2.2l on d-jet without a problem.

Did I mention I hate pulling injectors?

Car idles great and the cylinders are all equal as far as what the plugs look like. 1000 miles on the top end rebuild. CHT temperatures are going lower and lower as I have been richening it up. I now rarely hit 370. 70 cruising is 350, even less when I am trying to be nice. Oil temps is still great, mostly because of tangerine racings oil cooler bypass. Night and day predictable temps since I installed that. Can't recommend enough. 5 stars.


Could all the injectors have crudded up equally? This would have happened before the rebuild. Since I started the richening earlier this year.

New fuel filter installed 2.5 years ago when I bought the car. New injectors installed after that. Previous owner had a rich condition (mps shot).

Watching the fuel pressure while I drive shows no change, sticks strong at 32 psi.

This plug has 200 miles on it.

[r_towle]

Djet , properly tuned, can run up to 2.4 racing. Both on a dyno and track.
155-165hp depending upon the dyno.

I suggest getting an O2 sensor, stuffed up the tailpipe, hooked up to an AF gauge. This is temporary.

I run long wires up into the car so I can read it while driving.
Idle means nothing…you need to tune while driving with djet, or on a dyno

Add in resistance to the CHT circuit, this will enriched the mixture to the overall AF mixture.

Todo this once, and really precise.
Add a POT inline in the CHT circuit.
A POT is an old school volume knob rated up to 3-5k ohms.
Use the pot to get exactly what your motor wants.
Then measure across the poles on the pot and replace pot with resistors to match your specific settings.
Your settings, your timing advance, your motor, your elevation….all of that matters.

Hard fast test.
Take wire off CHT
Ground wire
Drive car full rich (which is wrong….but you can use this info)

You want to end up 12:1 for summer track time to help keep it cooler.