LSA inital fuel pressure

[50adrod]

I have a supercharged 6.2 LSA CTSV crate motor from GM and have the vaporworx fuel system with the CTSV dual pump. the car is not on the road but just runing in the shop it is very rich. Fuel pressure is 60 psi at idle. vaporworx states the fuel pressure on the CTSV pump can be set from 45 to 65 psi. Is 60 psi possibly causing my rich concern?

[parsonsj]

My understanding is that the LSA motor runs at 58 psi at idle. Doesn't seem like 60 would be an issue. Is the controller stock?

[CarlC]

JP is correct. The GM LSA crate engine tune is set for 58-60psi. A few psi difference is nothing to be concerned about.

Are you using the MAF sensor? The placement of the MAF is very important for the tune. They are not forgiving.

[killer69]

JP is correct. The GM LSA crate engine tune is set for 58-60psi. A few psi difference is nothing to be concerned about.

Are you using the MAF sensor? The placement of the MAF is very important for the tune. They are not forgiving.

How not forgiving?
mine runs really rich and cant seem to tune it out.

[50adrod]

JP is correct. The GM LSA crate engine tune is set for 58-60psi. A few psi difference is nothing to be concerned about.

Are you using the MAF sensor? The placement of the MAF is very important for the tune. They are not forgiving.

it is aout 14 inches from the throttle body, the instructions that came with the motor say a minimum of 12 inches fom the throttle body.
it currently only has the headers and the oxygen sensors are in the collectors, in the process of building the exhaust, a little backpressure may change things also

[parsonsj]

No exhaust?

That has to be fixed first. You've got atmospheric oxygen confusing the O2 sensors. You should have at least 3 feet of exhaust past the o2 sensor.

[CarlC]

Blake,

MAF placement can be a tricky animal. Air under suction tends to travel on the short side of turns. I've seen several placements of the MAF after an inlet turn on the outside where there is little air movement, especially at idle and part throttle. There are also concerns with larger intake tubes that even when the axial sensor placement is good the sensor does not read well. Sometimes moving the sensor away from the middle of the tube using a spacer is needed to get a good airflow reading.

I believe that for most a major A/F ratio problem won't be associated with the MAF as long as the tune is reasonably good. The ECM should fall back to speed density if the MAF signal is not found, but intermittent signals can cause cruise missing/sputtering. If there is a cruise sputtering condition and unplugging the MAF deletes the condition, them MAF placement may be the cause.

I'm a firm believer that the MAF is one of the greatest sensors ever if properly used.

I again agree with JP about the need for an exhaust system. Oxygen polluted exhaust will make the engine think it is very lean and will pour on the fuel.

[50adrod]

thanks for the input, we will be building the exhaust in a few days