what and why do you recirculate the bov??

[97gstt3]

i am geting a 1997 GST. the car has the normal mods done to it. but one guy said to make sure the blow off valve is recirculated. what is it and why should i do it?

 

[Cs4g63]

Read this.
http://www.dsmtuners.com/forums/showthread.php?t=113858

 

[TALONTRAX]

The incoming air entering the engine passes through the mass airflow sensor(Maf.)first before being compressed & consumed by the engine. The ecu uses the signal from the maf. to calculate fuel & timing maps. When under boost, the air charge between the compressor & the throttle plate is pressurized, & when the throttle is suddenly closed(you let off the gas), the compressed air is trapped. The bov.(blow off valve) is in place to releive this pressure surge. In a re-circulated system like a stock Dsm, the blown off pressure is re-circulated back into the intake tract, after the maf. & before the compressor housing. This is done because, that blown off air has already been processed by the maf.& ecu, & the ecu is delivering fuel to the engine based on that data. If this surged air wrere to be vented to the atmosphere, the engine would run pig rich for that period, as fuel is being delivered to the engine to be mixed with that processed air that never got in to the engine.

 

[97gstt3]

ok. if i do this "witch im sure i will if it it not done already" will i still get the cool "bushhhhhhhhh" sound?

 

[KPEclipse]

nope, recirculating ## bov removes the sound(well, to most) but is better for turbo spool.

 

[DGajre777]

You have to chose between the 'cool' sound or a properly running car. Some bov's make a loud sound even when recirculated.

 

[Eclipse98_RS]

You can run it and not recirculate it. The car will run more rich, and you will have a tad less performance. I had an HKS SSQV BOV in my 98 GS-T and it sounded too cool to recirc it, so I didnt. Be sure to plug off the little hole on the air filter if you do decide to not recirculate it. Like I said, I did this in my car and it was fine. You will still hear the turbo if it is recirculated but its twice as loud with it venting to atmosphere. Im sure I will get 800 people calling me a retard for saying this, but its the truth. It wont hurt your car that much to run it like that if thats the way you want it. The only thing you will notice is that your car will idle higher and you will run a little richer.

 

[silverbullett]

Seriously....just do it. The psshhh sound gets old after 5 minutes. Besides, the ssqv sounds wicked recirculated.

 

[TALONTRAX]

+1 On the ssqv sound . . .

 

[turbosax2]

Seriously....just do it. The psshhh sound gets old after 5 minutes.

Not to me! But ya, recirculate it and next time search - this has been beaten to death 5 million times.

 

[97gstt3]

thanks guys.

 

[98eclipsekidd08]

or get a 1G off someone for cheap or free like mine . I dont know what kind of tools you got but i also made the BOV flange so it was all free. The 1G BOV sounds a little different and holds more PSI, better quality part than stock and cheaper than a HKS

 

[forcefed4]

+2 on the SSQV recirculated sound

 

[97gstt3]

whats SSQV?

 

[timot]

my turbo xs RFL on my 1g recircled still sounded bad ass, especially after the dejon intake pipe put the connection right after the mas

 

[turbosax2]

whats SSQV?

http://www.hksusa.com/products/?id=792

 

[98eclipsekidd08]

a ssqv is a BOV made by HKS called the super sequential my friend has one shounds great work good to

 

[whiteflash]

my 1g bov is pretty loud even recirculated. a hard intake pipe will also make it louder.

 

[pwayzjellyroll]

my 1g bov is pretty loud even recirculated. a hard intake pipe will also make it louder.

+1 for this, The 1g BOV is loud enough for my liking, and when I went from my stock intake pipe to my Dejon Tool one it gave the BOV a different and louder sound.

 

[98eclipsekidd08]

+1 for this, The 1g BOV is loud enough for my liking, and when I went from my stock intake pipe to my Dejon Tool one it gave the BOV a different and louder sound.

+2 yea like i said earlier a 1G BOV + intake = good sounding and will still hold a decent amount of pressure

 

[Eclipse98_RS]

Man there are some crazy points given away here. I think the sound un circulated sounds bad ass. Never got old when you pull up along side someone at WOT and shift right by there window.

 

[Sp1kE]

If your bov leaks. which most stockers do.
Then this causes more richness when it is not recirculated
Take off the return pipe for bov, plug the intake side, then let the car idle.
Then put your palm over the opening of the bov.
You will most likely hear the engine change tone.
That is an example of the difference it makes to run your "correctly" or "cool"

Now imagine that while boosting. and the incorrect readings you will be getting.

 

[thekellbeast]

I have the 1g BOV, I performed the Dodgegarage mod to it, and it holds pressure fine. I'm running a front mount kit and I'm recirculating. The problem is that the position of the BOV creates a bit of a kink in the stock recirc line, so when the BOV opens, it creates a really loud fluttering sound. Wierd.

 

[MrBoxx]

A: You can either run the BOV recirculated on the stock MAS, have good idle, not have rich-burn issues, etc. and still make a muted "psh" noise...

OR

B: You can recirculate IMPROPERLY, have idle issues, stall out, have a vacuum leak, run rich between shifts...

OR

C: You can purchase a GM MAF, MAF Translator, new intercooler pipes, and with the MAF in blow-through mode, PROPERLY vent your BOV to get the cool "psh" noise.

Choices A or C are the only ones anybody who knows anything about these cars will recommend. Choice B is if you only care about how your car sounds, and if this is the case, you're buying the wrong car for the wrong reasons.

This topic has been beaten to death, then beaten some more.