REFLECTOR: Turbo concerns

[Chris Barber]

Thanks Mark. I shall. I had a destination issue due to low octane fuel requiring a replacement of the apex seals so I started with minimal boost. But it would seem even minimal boost should give some boost.

I have two mp gauges. They are not reading exactly the same but within a few tenths of each other.

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On Aug 20, 2012, at 8:52 PM, "Mark Magee" <edjonesbrady at gmail.com<mailto:edjonesbrady at gmail.com>> wrote:

Hi Chris,
I would say to look at two things: 1) Turbo waste gate setting and 2) MP sender or guage.
I don't know what MP PSI the 3lb spring on the wastegate controller equals, but it sounds low. I just installed a manual wastegate on the family trip wagon, a 1998 6.5TD Suburban and the spring tension is much more than 3 lbs, more like 15 to 20lbs to open, is set in inches of spring span and equals 14PSI MP to open. I would think you should start with investigating the wastegate settings first.

Mark Magee
N34XL
Brady TX

On Mon, Aug 20, 2012 at 8:18 PM, Chris Barber <cbarber at texasattorney.net<mailto:cbarber at texasattorney.net>> wrote:

As I have mentioned I have had what I think are incongruent readings regarding my manifold pressure (mp)and engine rpm. It seems I am getting quite low mp as I add power to higher rpm.

I am not well versed in this area but my thought is that as I add power, even with slight boost (currently using a 3 lb spring in my wastegate) eventually my mp should raise a bit more.

Today I did some static test. I recorded engine RPM with the  turbo hooked up and recorded the mp at 1000 rpm increments. Then I removed the turbo plumbing from my intake and recorded the same info My results currently confuse me.

With the turbo hooked up I am getting

RPM.   MP inches
2000 - 14.0
3000 - 15.5
4000 - 19.3
5000 - 21.6
5700 - 24.5 (topped out)

With the turbo removed.

2000 - 15.8
3000 - 15.3
4000 - 19.7
5000 - 24.8
5833 - 29.8

Is this indicative of restriction in my plumbing? Perhaps in the inter cooler? A dirty air filter? A bad pop off valve or a leak not allowing the air pressure getting to the intake. Or????

I am uncertain what other permitters I need to check and provide. I am just starting my diagnosis in my Phase One testing. I only have 1.6 hours in the air so far. I value ya'll's direction and input.

Heck, perhaps this is working properly but it just doesn't seem right/comfortable.

Thanks folks.

Chris Barber
Houston
Velocity SE
Rotary 13b turbo (?) :-)

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