Would appreciate some tuning advice for new 2056, Having trouble dialing in the AFR Options

[rbzymek]

So I replaced the 1.8L with a SCAT 2056 long block with a Web 73 cam and 42x38 valves. They provided 4 bolt (intake) heads so I could use the 1.8 tin and carry over L-Jet system. The CR is 8.5 and I have an adjustable FPR. The injectors are stock 1.8L L-Ject. I can dial in the idle AFR easily but I get rich 9.0 AFR on very light tip in. I also go lean at higher speeds (>4000). I suspect the static is set too high on the AFM. Any suggestions?

[djway]

When trying to get the old tired 1.8 to run I just jumped on the freeway while watching the gauge under load then at cruise.
I would get off the freeway and adjust the spring pressure then hop back on the freeway.
I kept doing it until the numbers looked acceptable.
In my case it was dumping too much fuel so I tightened the spring.

[rbzymek]

When trying to get the old tired 1.8 to run I just jumped on the freeway while watching the gauge under load then at cruise.
I would get off the freeway and adjust the spring pressure then hop back on the freeway.
I kept doing it until the numbers looked acceptable.
In my case it was dumping too much fuel so I tightened the spring.

Good plan. I have some FJ707 injectors on order which are replacements for 2.0 912 with L-Jet. I also have a fuel pressure regulator coming which is supposed to be for a 1.8 914 which should be 35 psi. All of the other FPR's I purchased are 40-42 psi. I will install the correct parts and give it a try.

[rbzymek]

When trying to get the old tired 1.8 to run I just jumped on the freeway while watching the gauge under load then at cruise.
I would get off the freeway and adjust the spring pressure then hop back on the freeway.
I kept doing it until the numbers looked acceptable.
In my case it was dumping too much fuel so I tightened the spring.

Good plan. I have some FJ707 injectors on order which are replacements for 2.0 912 with L-Jet. I also have a fuel pressure regulator coming which is supposed to be for a 1.8 914 which should be 35 psi. All of the other FPR's I purchased are 40-42 psi. I will install the correct parts and give it a try.

Clay,
I installed the FJ707 General injectors and the Beck Arnley 158-0073 FPR both of which reference a 2.0L 912 engine. Engine off pushing the fuel flap I get 41 psi on the gauge. It shows about 34 psi gauge at idle with the vacuum compensation. After a good warm up run I adjusted the AFM to get 13.5 at idle and about 12- 12.5 at WOT. My RPM limit is 4000 RPM unlit after break in. The throttle body is a 45mm bus unit. The bad news is that I get 8.5 to 10.5 AFR at part throttle tip in with some rich misfire. Heavy crowd is 13-13.5. If I tighten the AFM then I get 15-18 AFR at idle---no good. I think the fuel pressure is too high but this is about the third FPR that I have tried. Another issue is that I cannot get the idle below 1200 even with the TB screw all the way in. (need to see if there is a hole in the plate.) I looked for leaks and even plugged the air bypass hose. I used rubber cement on the runner hose sleeves and Permatex on the intake gaskets. Timing is set at 7 degrees with the vacuum hose off. Any suggestions would be appreciated.
Regards,
Ray

[ClayPerrine]

When trying to get the old tired 1.8 to run I just jumped on the freeway while watching the gauge under load then at cruise.
I would get off the freeway and adjust the spring pressure then hop back on the freeway.
I kept doing it until the numbers looked acceptable.
In my case it was dumping too much fuel so I tightened the spring.

Good plan. I have some FJ707 injectors on order which are replacements for 2.0 912 with L-Jet. I also have a fuel pressure regulator coming which is supposed to be for a 1.8 914 which should be 35 psi. All of the other FPR's I purchased are 40-42 psi. I will install the correct parts and give it a try.

Clay,
I installed the FJ707 General injectors and the Beck Arnley 158-0073 FPR both of which reference a 2.0L 912 engine. Engine off pushing the fuel flap I get 41 psi on the gauge. It shows about 34 psi gauge at idle with the vacuum compensation. After a good warm up run I adjusted the AFM to get 13.5 at idle and about 12- 12.5 at WOT. My RPM limit is 4000 RPM unlit after break in. The throttle body is a 45mm bus unit. The bad news is that I get 8.5 to 10.5 AFR at part throttle tip in with some rich misfire. Heavy crowd is 13-13.5. If I tighten the AFM then I get 15-18 AFR at idle---no good. I think the fuel pressure is too high but this is about the third FPR that I have tried. Another issue is that I cannot get the idle below 1200 even with the TB screw all the way in. (need to see if there is a hole in the plate.) I looked for leaks and even plugged the air bypass hose. I used rubber cement on the runner hose sleeves and Permatex on the intake gaskets. Timing is set at 7 degrees with the vacuum hose off. Any suggestions would be appreciated.
Regards,
Ray

The fuel pressure is a little high. What fuel pump are you using?

Also, you might want to try an AFM that has not been opened up. And also replace the gaskets in the oil filler cap. If they are bad,they will cause a false air issue, and make the car run bad. If someone that didn't know any better changed the AFM to compensate for the bad oil cap seals, you can get all kinds of screwy mixtures.

Clay