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BOV and waste gates 

 

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Posted: Wed Jun 20, 2007 10:50 pm 
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Looking at around 1/3 of the way down on the turbo 103 section I can see what they are trying to say. But surge on load is much mopre dangerous.
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Posted: Wed Jun 20, 2007 11:03 pm 
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this is from corky bells "Maximum boost" book


Compressor surge occurs when the throttle is slammed shut and air is caught between a pumping turbo and the throttle plate. this air blasts its way out the front of the turbo. when this happens, there is suddenly room for more air in the manifold, and air is pumped back in by the still-spinning turbo. the throttle is still closed, so the air again blasts it way back out through the turbo. this continues until the turbo loses enough speed for leak back around the compressor to dampen the air oscillations. compressor surge can also occur under boost if too much boost is present with low airflow through the system. the chirping sound heard from the turbo when lifting off the trottle while operating under boost results from this oscillating air volume. this noise is suppressed by the bypass valve.

 

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Posted: Wed Jun 20, 2007 11:05 pm 
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mainly guys wont use a blow off valve on an automatic as it isnt really required as throttle is held constantly high through gear changes.
in a manual on the other hand when you let off the throttle to change gear a large pressure is built up in the intercooler and pipes which wants to go back into the turbo. This will cause the turbine to slow down so that when you get back on the throttle it takes longer for the turbo to spool up. Whereas a blow off valve will alleviate this pressure and will allow the turbo to spool up faster once you get back on the throttle.

 

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Posted: Wed Jun 20, 2007 11:12 pm 
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bovs also stop joins on inter cooler pipes blowing of all the time.

imo its best to use 1

 

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Posted: Wed Jun 20, 2007 11:43 pm 
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xcabbi wrote:
I'm more than just a s**t ex cab driver.
lol i knew that comment would fire a reaction, all good cabbi just stiring, i know f**k all about turbo's i have never played with one before and i have been asked to set up a turbo for a mate so i have been researching for the last week or so and there's a few things i need to get my head around, seems that everyone has different opions and idea's on running a turbo.


what if the car has a air flow meter fitted before the turbo is there a way of still fitting a BOV without the AFM over fueling the engine when the BOV operates?? besides backfiring what issues would a BOV running with a AFM cause ??

Last edited by fastleno on Wed Jun 20, 2007 11:59 pm, edited 1 time in total.

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Posted: Wed Jun 20, 2007 11:48 pm 
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Plumb it back in between the turbo and airflow meter and bobs your uncle, problem solved.
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Posted: Wed Jun 20, 2007 11:49 pm 
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also i need to find out how to set up the timing using a electronic vacuum advance dissy

Last edited by fastleno on Wed Jun 20, 2007 11:58 pm, edited 1 time in total.

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Posted: Wed Jun 20, 2007 11:56 pm 
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xcabbi wrote:
Plumb it back in between the turbo and airflow meter and bobs your uncle, problem solved.
arr i see how that could work i spose that way the air wont get counted twice the only thing that i can question there is being a vain/flap style AFM it wont have the opposite affect and close the flap or worse jam it closed, i have seen xf's on backfire and jam the flap in the closed position
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Posted: Thu Jun 21, 2007 12:06 am 
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Wheres is the ISC taking its feed from? After turbo or before turbo?
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Posted: Thu Jun 21, 2007 12:19 am 
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no where at the moment i will be starting the turbo conversion on the weekend, where should i locate it ?
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Posted: Thu Jun 21, 2007 12:29 am 
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The most logical place would be bwteen the AFM and BOV as when the throttle is snapped shut the ISC will open to keep the car idling and this air should be metered properly.

I'm just going off the top of my head here. Best wait till Ebs 4L or EBXR8830 see this thread and make a comment.
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