Info on BOV's for the Powerdyne People.

[Blazzin Joe]

http://www.vortechsuperchargers.com/.../8d20400im.pdf

Take a look at that install document from VORTECH regarding how the bypass valves are supposed to be used.

The way i read it is this: The bypass valve should be placed befor the MAF meter and the vent line should be placed back into the intake track AFTER the MAF... did i read this right? And if i did that poses a problem since the MAF is built into the TB on the 2000+ :/

[Ike]

well, no you didn't read it right...i think what they were expecting was that the maf is after the air filter but before the supercharger...and the bov is after the s/c and then the vent line will go back to the inlet of the s/c. perhaps even the throttle body will be before the supercharger. it's an interesting difference between the powerdyne setup and the rest of the setups i've seen, that the throttle body and maf are not before the s/c (in the powerdyne's case)

if you look at an M90 (version 4 i think) (like the gtp etc.) you can see that this is the type of setup they use...

i suppose the idea is that whatever air passes the maf will eventually find it's way into the engine and only be counted once...

perhaps placement of a s/c before the maf causes strange measurements due to the chance of decreased volumetric flow across the sensor (if left un-calibrated)

[jmorgan]

i agree i know grand nationals have there maf before the turbo. theres were its actully supposed to go but ours is in the tb (someone could make a little holder for it and move it to before im sure)would probly help with the idle too

[Blazzin Joe]

<blockquote>quote:</font><hr>Originally posted by Jason Morgan:
i agree i know grand nationals have there maf before the turbo. theres were its actully supposed to go but ours is in the tb (someone could make a little holder for it and move it to before im sure)would probly help with the idle too<hr></blockquote>

It would probably through off the calibration if it was moved to another location, i had thought about that too! i think im just going to use a BOV designed for imports that only opens on pressure change and see if that helps my problem or not.

[Mighty Thor]

This was a Vector Perf. Installed BOV from Ed's car:

http://members.cox.net/eqscorp/Supercharger/Blower9.jpg


I bought a Saab BOV and I'm trying to figure out how Ed got that vacuum.

[Mighty Thor]

Oh, from that picture. Could anyone tell me where Ed got that vacuum routed too. I have an idea but not sure. Thanks

[Blazzin Joe]

<blockquote>quote:</font><hr>Originally posted by Mighty Thor:
Oh, from that picture. Could anyone tell me where Ed got that vacuum routed too. I have an idea but not sure. Thanks<hr></blockquote>


Route it to the same line you put your boost gauge on.

However i had mine setup pretty much just like that and i still have severe idle issues. I really think im just better off getting a BOV that only opens on pressure changes. Rather than one that stays open at VAC and Closes under BOOST.

[hou-tex-six]

Interesting Joe....i guess by this point trying a different type of BOV woudl be only other option...But have people been using the same one you have without trouble? Still cant beleive there is no input from people that ave and run this system.

CP

[Mighty Thor]

<blockquote>quote:</font><hr>Originally posted by Blazzin Joe:



Route it to the same line you put your boost gauge on.

However i had mine setup pretty much just like that and i still have severe idle issues. I really think im just better off getting a BOV that only opens on pressure changes. Rather than one that stays open at VAC and Closes under BOOST.<hr></blockquote>

What type would you recommend Joe?

[Blazzin Joe]

<blockquote>quote:</font><hr>Originally posted by Mighty Thor:


What type would you recommend Joe?<hr></blockquote>

This is a snippet from another web forum:

Some BOVs leak air so the idle of a car using the factory ecu such as yours is affected, since it meters intake air by flow BEFORE the blow off valve. The car is taking in more air (through the leaky bov) than metered, resulting in severe idle quality problems and in many cases stalling. (Cars using aftermarket ecus will not have such problems as they measured air intake by pressure in the intake manifold.) Air flow meter cars running the factory ecu will have no problems using a good sealed sequential bov. These will leak no air at idle and vent compressed air when the throttle plate is closed between shifts just the same as any other bov. The most trusted and cheapest sealed bov I know of is the Baily valve available from Roadster Performace for $135. Good luck.

The BOV that i am going to purchase is the HKS SSBOV.

Snipped from another website:

The Super Sequential BOV is a pull type relief valve, unlike other BOV's which are push spring type & are prone to leaking. The SSBOV is actuated by pressure alterations only, ensuring quick valve response & complete closure during idle. Standard BOV's must utilize large valves in order to accommodate high boost/power application. However, these large valves react slowly & require high activation pressure to open. Smaller, fast reacting valves, do not permit the air flow required for high horsepower. The SSBOV incorporates both for maximum performance. It is engineered utilizing a small primary valve for ultra quick activation along with a secondary valve for additional relief capacity. The SSBOV is made of billet aluminum & emits a unique, aggressive sound.
Click www.hksusa.com for more information about this product.

This website has some good info on several models of BOV's http://www.horsepowerfreaks.com/

[ February 07, 2003: Message edited by: Blazzin Joe ]</p>

[Tiago]

sounds good joe, I wonder if we'll have to use the same system on my 3.8 project ;)

still don't understand why it would have problems if the BOV is not leaking...it shouldn't be....

[Mighty Thor]

Excellent analysis, thanks Joe.

[hou-tex-six]

Looks good joe, if you can get it for like 150, HKS site shows it at $250.... Also, i think replacing that pos rubber elbow with something stronger to fit that BOV on is a must.

Cp

[xjarayax]

Another cheap solution is a DSM take off BOV, they also recirculate if you want them to. Can be had on eBay or Dsmtrader.com for like ~$30.

That's what I am using. I had the plastic POS Bosch thing but that just looked too flimsy to trust my turbo to it- but I guess if it works it works, just throwing out another suggestion.

Here's an excellent writeup on how to install a DSM 1G BOV onto a custom application:
http://www.thedodgegarage.com/turbo_bov_install.html

Edit: Didn't mean to bring this up from the dead but figured it'd be good information.

[ April 28, 2003: Message edited by: xjarayax ]</p>