Whats the normal vacuum psi range for a Speed6

[Marcus]

I know one of you guys knows the normal operating vacuum psi range for a Speed6?

After installing the TS BOV, CS TIP and various other tubes, I just want to make sure my DH reporting a range of -18 to -25 psi is normal.

TIA.

[dale_gribble]

FYI -18 to -25 isn't psi. Vacuum is in in/hg on the DH.

How many in Hg in 1 psi you ask? The answer is 2.0360206576.

You are reading -8.84psi to -12.28psi which is normal I guess, not knowing your altitude. I pretty much run the same range.

Pay attention to your long term fuel trims. They should be <5% across the closed loop RPM range. You can monitor those with the DH.

[Marcus]

Originally Posted by dale_gribble FYI -18 to -25 isn't psi. Vacuum is in in/hg on the DH. How many in Hg in 1 psi you ask? The answer is 2.0360206576. You are reading -8.84psi to -12.28psi which is normal I guess, not knowing your altitude. I pretty much run the same range. Pay attention to your long term fuel trims. They should be <5% across the closed loop RPM range. You can monitor those with the DH.

Ltft have usually been 10-13.... I'll check again when I leave this here shop. Hopefully the new fuel pump sets things right.

[Marcus]

Originally Posted by dale_gribble Pay attention to your long term fuel trims. They should be <5% across the closed loop RPM range. You can monitor those with the DH.

They're hovering around 7-8%.

[dale_gribble]

Ya that's OK. Well within the range of the ecm being able to manage.

[kby]

Stock in psi is -10.6ish idle, -8.8/9 with a/c condenser on. In NY, about sea level+80ft

[Marcus]

Originally Posted by kby Stock in psi is -10.6ish idle, -8.8/9 with a/c condenser on. In NY, about sea level+80ft

Thanks as I'm also coastal and about 120 above sea level.

[GG6]

I usually run around 16 in.Hg at idle. I'm a little more than a mile above sea level normally.