Exhaust Back Pressure Gauge Bouncing

[JET]

So just installed some new gauges on the truck.

As im driving, I notice that the needle on the gauge for the exhaust back pressure just kind of bounces.

Not like a surging kind of bounce, but a bounce like a needle is just free-floating.

When i get on it, and the pressure goes up, it bounces less but still bounces a little bit.

Is this normal?

I also did fuel pressure and boost gauges, and those seem fine with no bouncing.

Also, back pressure seems to be a lot less than boost pressure which I wasn't expecting.

I can try to do a video later on if im not explaining the problem very well.

Also, the truck has a second-gen swap.

Any help would be appreciated.

Thanks!

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[Chrisn162001]

The jumping is normal.

It’s just the sensor picking up the exhaust pulses.

You can get a filter for it.

It will calm some of the jumpings, but it’s unnecessary.

The ideal boost to drive pressure is 1:1 - 1:1.5.

What size turbo did you get?


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[JET]

I have a stainless s468/83/1.0.

I expected drive pressure to be the same or a little more than boost, but it’s lower.

Could that be from larger exhaust housing on the turbo?


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[Chrisn162001]

Yeah, bigger exhaust housings will lower drive pressure.


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[JET]

That’s what I figured.

Always nice to get some confirmation from others who know about this stuff. I’m learning as I go.

Thanks!


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