BOV + ATX = Good?

1800 Views 33 Replies 11 Participants Last post by shannonlujan, Oct 15, 2003

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Discussion Starter · Oct 10, 2003

I'm sixteen and my dad bought a 1990 MX6 GT like 2 years ago. I just started getting interested in cars this summer and never even thought that the MX6 was a turbo. Now Im thinking about getting a bov for that whoosh sound. Looks is all that im going for and sound. I got a A3 Racing muffler on and soon I hope some rims, a BOV, intercooler, coil-overs, intake, and headers. I got a garage to work in at school so installing these shouldn't be too hard. Plus I've been reading around this board for the past 2 weeks but just haven't gotten the chance to post yet because of school work and soccer. Back to the BOV, my MX6 is automatic and I read on here that it is 7.3 psi stock. Is that enough to make the whoosh sound? Do different BOVs make different sounds? I first heard the whoosh sound from a friend of mine that has a Talon TSI (the newest models). It sounds cool and stuff so just wondering if I could get that kind of sound with the MX6. My car shifts gears b4 it even reaches 3000. Is that enough to make the whoosh sound? On the board it said above 3000 rpm the psi increases. I'm not really familiar with all this and my dad also said the turbo is there just to help out when going up-hill. My dad probably knows more then me so I'm not going to argue with him about that. What do you guys think?

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rebel2k4

· #2 · Oct 10, 2003 (Edited)

First off let me say "welcome" to the boards.

Okay, I think some people are going to rip on you after reading that post.

1st gen owners are generally "function over form" when it comes to these cars. Not many ricers around these parts. From your post it seems like you have a little to read up on. Try to stay with me here as I explain....

Any pressure build up in a forced inducted car (turbo or supercharged) will make a noise when expelled to the atmosphere after you have let off the throttle. This is what you hear from a BOV. Our cars use a bypass valve, or BPV to vent that air back into the intake, so basically you don't hear that noise. Since these cars use a VAF, or volume air meter, the computer will expect the air you just released to be going into the engine, but it does not. This will cause you to temporarily run rich, which means there's too much fuel injected into the engine. It will cause you to have a little worse gas mileage, and run a little rough. Some BOV's will not idle right either.
So.. to sum it up..

-A BOV is not the best option for driveability or performance, but can be installed and will make the sound you're after.
-Do a search

Have a nice stay

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shannonlujan

· #3 · Oct 10, 2003

Nicely put Brandon.

I'm not sure how it would work with an ATX but I assume it would work as normal although I've heard thats its "not reccomended" due to the fact that well, you don't have much control over the car really.

Theres a website somewhere that lets you sample different BOV sounds but I couldnt find it.

HINT: DO NOT LOOK UP "BLOW OFF VALVE WAVS" ON GOOGLE!!!! :E

If you're feeling curious go search those exact terms and click "I'm feeling lucky" HAHAHAH

Dumped626

· #4 · Oct 10, 2003

If you want to hear different types of blow off valves go to ... www.blowoffvalves.com ... They have a section of video and sound clips of different blow off valves on different cars ... The best ones out on the market right now are the Greddy Type S and the HKS Super Sequential blow off valves ... Ghetto azn prep ... I also have an automatic but i have a 90 626 GT Touring Sedan ... Same exact engine though and i am going to install my Greddy Type S blow off valve as soon as possible ... Check out my car if you want ... Dumped626 :smokin:

G

Discussion Starter · #5 · Oct 10, 2003

A blow off valve will only vent when the throttle plate is closed, on a manual this happens everytime you shift, on an automatic, this only happens when you take your foot of the gas to slow down.

So, its kinda pointless to have BOV for sound on an ATX, seeing as your only going to hear it as you decelerate.

crusty

· #6 · Oct 10, 2003 (Edited)

I wondered why you didn't use a bov on autos, now i know. Well put 'swat.

I'm not really familiar with all this and my dad also said the turbo is there just to help out when going up-hill.

There's a lot to learn about cars & it seems daunting when you first start out. I'll try to help a bit.

A turbocharger uses the flow of exhaust gasses to spin a turbine which is attatched by a shaft to a compressor wheel which (as the name suggests) compresses the air going into the engine. The engine therefor doesn't have to "suck" air, instead air is forced into it under pressure (stock approx 7psi....easily increased). The larger amount of air/fuel means the engine can create more power (similar to having a larger engine).
So it does "help out" going up hills, but it improves your power output all of the time. (well actually only when the effect of the compressor exceeds the suck of the engine at about 2500rpm...but you get the idea)

Like Flyswat said, don't bother thinking about the BOV on an auto. I don't have one on my manual, I don't see the point having something because it goes "whoossh" or "Psssst". I'd prefer to spend to money on something that will increase performance like a manual boost controller, or something that gets forgotten like general maintainance. We have a bypass system that is perfect (kinda) for our type of air flow meter, don't mess with it.

We already have a Intercooler, it is in front of the radiator on the lower right side (looking from the front).

Happy MX6 ing, and welcome to the board. We're a friendly bunch
})

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Discussion Starter · #7 · Oct 10, 2003

crusty said:
Happy MX6 ing, and welcome to the board. We're a friendly bunch
})

Except for me and Sleepcounter. We will kick your ass if you so much as misspell a word.

Just kidding...I don't know about sleepcounter, but I can sometimes be a bit of a loose cannon.

crusty

· #8 · Oct 10, 2003

.................. no comment

Just don't mention decals . (or ponykillerprobe

)

SixSick6

· #9 · Oct 10, 2003

I cAnT StAnD PeOplE WhO TyPe LiKE ThIs

SleepCounter

· #10 · Oct 10, 2003

FlySwat said:
Except for me and Sleepcounter. We will kick your ass if you so much as misspell a word.

So glad you didn't misspell "misspell" -- I woulda pounced fersure! Actually, I find myself becoming more tolerant of grammatical (but not numerical) errors since crusty's started tutoring me in pmail about how to speak Oz.

FlySwat said:
Just kidding...I don't know about sleepcounter, but I can sometimes be a bit of a loose cannon.

We gotta restore the old coffee ration, yer getting a little too wired these days.

Welcome aboard, gHeTTo AzN PrEp, don't be intimidated when some of us start acting snooty and knowledgeable -- all of us have stuff to learn; all of us have stuff that others can learn from.

The only real sin around here is asking a question that's been answered 112 or more times in the last week. The search button is your friend.

crusty said:
no comment

That's how they say "wategate" in Oz, right?

crusty

· #11 · Oct 10, 2003

That's how they say "wategate" in Oz, right?

?????????????? I don't get it.

SleepCounter

· #12 · Oct 10, 2003

amoretto-induced text impediment

crusty said:
?????????????? I don't get it.

Sorry, I meant to type "wastegate" but my keyboard slipped out of gear.

I was trying to make a funny about the differences in grammar and usage between the different cultures on different continents. Maybe if I'd learn to spell, the joke might not have crashed on takeoff.

I'd best not quit my day job.

mx6GT91

· #13 · Oct 10, 2003

BOV's work the same way as the do on automatics as they do with 5speeds. Say hes boosting to pass a car and he suddenly takes his foot off the gas. its going to make the sound. The only way it wont make the sound is if hes on the gas constant.
Or to make the sound when he wants to show off use the hold button or use the lower gears such as drive 1 or drive 2?? (dont know much about the automatics) let it boost a little and take his foot off the gas. Your car should rev above 3000rpm unless your a puss and you dont hit the gas. Take it for a drive and hit the gas to the floor and let it scream through 1st and 2nd gear. Hold on to the wheel because the torque steer will take over. hehe

I know you all have heard BOV's on Grand Nationals?? I always do.
Take a look at this site, it has the sounds of most popular BOV's
http://www.socalsupras.com/tuning/blowoffvalve.html

Methman

· #14 · Oct 11, 2003

Yeah but the reason why most MTX drivers put on a BOV is because you will get the sound between shifts like....1st...broooooommmm....woooooooosh...2nd....brooooooooommmmmmmm.....woooooooooooosh, 3rd...brooooooooooooooooooooommmmmmmmm.....woooooooooooooosh, 4th ect. (sorry had to do it). The you will also get the sound when you let off the gas.
On Autos it will only make the wooooosh sound when you let off the gas, IMHO BOV's only sound cool when they wooosh between shifts. Unless you wanted to drive your auto like its a MTX, like hit the gas let the RPM's raise then let off the gas to get the wooooosh, then hit the gas again let the RPM's raise then let off the gas and get the woosh, do this 5 times. lol

methman

SleepCounter

· #15 · Oct 11, 2003

Methman said:
The you will also get the sound when you let off the gas.

You lift when you shift? Doesn't that hurt your ET?

G

Discussion Starter · #16 · Oct 11, 2003

SleepCounter said:
You lift when you shift? Doesn't that hurt your ET?

I never flat foot shift/power shift...whatever, I like my clutch

mx6GT91

· #17 · Oct 11, 2003

I bought my BOV to hold more boost. The reason why I bought the BOV I have (TurboXS RFL) is to make noise. I did it for both reasons.

He can still drive the car like normal without using the manual mod but it wont make much noise. He could be in stop and go traffic, take off some and release the gas. The BOV would go off along with the tranny shifting. If he keeps it in the stock location the BOV is going to go off with the slightest tap of the gas. I remember when my BOV was there, I loved it and it screamed so loud. To add to the sound that you want , go ahead and add a filter (intake) that will have a sucking/whirring sound that I love.

If you want to show off use the manual mod, thats what my friend does in his Eclipse. All he did was disconnect the recirulating pipe for the bypass (hes stupid) and when he wants to show off he leaves it in drive1 and lets of boost and take his foot off the gas.

ZFreakMX6

· #18 · Oct 11, 2003

Feel luck you don't own a TTZ (for those of you that do, you know what I'm talking about).... on my 94TTZ, I had the HKS SSQ BOVs (yes plural).... $550 of blow off valves.

It was more for boost needs than sound, but they were REALLY loud though... and fun.

mx6GT91

· #19 · Oct 12, 2003

Everyone has the HKS SSQ BOV, yes they are loud with just one I couldnt amagine 2!!!

I dont like that BOV much, it sounds great and they dont leak. but there all over, just recently TurboXS is getting really popular. I remember at meets I was the ONLY car with it, now there all over. It seems that the Subaru owners took a chance on them and found them to be really good quality.

spirol

· #20 · Oct 12, 2003

My friend installed a TACH with a Shift light on his automatic car.
He took it out because its mostly the reason why he get into fights with other people.

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