REFLECTOR: Turbo concerns

[Chris Barber]

Scott, 

Thanks, that gives me some specifics. 

Chris

Sent from my iPhone 4

On Aug 21, 2012, at 8:56 AM, "Scott Derrick" <scott at tnstaafl.net> wrote:

> You definitely have something not working in your turbo setup. I'm assuming you measuring upper deck pressure?  Ala intake pressure after the intercooler and servo?
> 
> problems.
> 
> 1.) turbo is not spinning freely due to internal obstruction(I've seen rags), bad or incorrectly installed bearings, bent fan, etc.  It should spin very freely by hand, take a long time to come to a stop. Blow a vacuum cleaner through the turbo and see how she spins, with an open turbo(no back pressure) it should spin up very fast with a large canister style vacuum.
> 
> 2.) waste-gate opening prematurely. In your case immediately. Can you see the waste-gate operation when the engine is running? Make bright marks on the moving parts to make this easier.  Note its position before start, then at idle, then a varying degrees of throttle position. It should be completely closed until close to mid throttle. At least the tio520 operated in that manner.
> 
> 3.) pop-off opening too soon.  Tie a rag or something to the opening that will flutter around when it opens. Do this at the same time your observing the wastegate.
> 
> 4.) If all the above are OK, its possible your intercooler is restricting flow. remove the intercooler and run without it.
> 
> Scott
> 
> 
> -------- Original Message --------
> Subject: REFLECTOR: Turbo concerns
> From: Chris Barber <cbarber at texasattorney.net>
> To: REFLECTOR <reflector at tvbf.org>
> Date: 08/20/2012 07:18 PM
> 
>> 
>> 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 (?) :-)
>> 
>> Sent from my iPhone 4
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