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Old 10-11-2005, 02:46 AM   #1
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Blow off valve

I was thinking about getting a blow off valve+turbo kit. Has anyone installed this? I couldn't find anything on Ebay. Maybe you guys can hook me up with some info. such as pricing and recommended brands. Thanks in advance.
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Old 10-11-2005, 09:10 AM   #2
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Re: Blow off valve

lets start from the beginning... what kind of mustang do you have? (year, model, tranny) is it modified? light or heavy modding?

if you're a stock v6 mustang, then a turbo kit won't do you much good. running safe boost on a stock engine(4psi) isn't gonna give you much in the way of gains, and if you try to run higher boost, you'll blow your powertrain with a quickness...

so, with that in mind, let's have some basic info on your ride

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Old 10-11-2005, 09:18 AM   #3
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Re: Blow off valve

safe is in the eye of the beholder. You can run 10 psi with a good tune every day with out issues or you may have issues left and right.... I would say 8-10 psi will be fine if you have a GOOD TUNE, not some POS mail order chip, a real dyno tune. For the money you could build the motor to put out the same about power levels and have no power adder on it, then later put a power adder on top of it.
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Old 10-11-2005, 10:52 AM   #4
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Re: Blow off valve

TMA states that you can stay at 4.4psi on stock internals. I can believe that... but 2500 for a 40 horse gain... thats a lot of cash.

But I've been contemplating the idea myself as of late.
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Old 10-11-2005, 11:29 AM   #5
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Re: Blow off valve

with the 4.4 psi the guy had 240ish at the wheels. if he's a stock 99+ then that's about 70 more hp at the wheels. to me it sounds like a good start because you know you can always turn it up later on.
I don't know what a 70 plus gain feels like but it's sure as hell better then what i have right now. i'm still trying to work out all the small issues that people don't tell you about...
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Old 10-11-2005, 11:32 AM   #6
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Re: Blow off valve

Quote:
Originally Posted by drwang
I was thinking about getting a blow off valve+turbo kit. Has anyone installed this? I couldn't find anything on Ebay. Maybe you guys can hook me up with some info. such as pricing and recommended brands. Thanks in advance.
just to let you know, with the TMA turbo kit, it uses a BPV and not a BOV. So if you're after the "whoosh" then you won't get it without a few hundred more to convert to blow-thru MAF setup and a new BOV
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Old 10-11-2005, 12:40 PM   #7
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Re: Blow off valve

what does BPV mean?

<~ turbo stupid.
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Old 10-11-2005, 12:45 PM   #8
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Re: Blow off valve

Bypass Valve

A bypass valve recirculates the compressor surge, rather than blowing it off to the atmosphere. Since our cars are metered (maf), blowing off the metered air will make it run rich untill you get back into the gas
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Old 10-11-2005, 12:46 PM   #9
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Re: Blow off valve

Quote:
Originally Posted by Rellik
TMA states that you can stay at 4.4psi on stock internals. I can believe that... but 2500 for a 40 horse gain... thats a lot of cash.

But I've been contemplating the idea myself as of late.
TMA bases his 4.4psi on the fuel system rather than on the stength of the internals. You can run 4.4psi safely with the 19# injectors that the 99+ comes with. The internals can run 10-12psi safely, and 14ish psi with a perfect tune, intercooler, and no detonation at all
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Old 10-11-2005, 04:40 PM   #10
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Re: Blow off valve

99+s came with 21# injectors
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Old 10-11-2005, 05:16 PM   #11
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Re: Blow off valve

Quote:
Originally Posted by Monkey
99+s came with 21# injectors
you sure? because from what i recall, they were 19#

what color are they?
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Old 10-11-2005, 06:36 PM   #12
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Re: Blow off valve

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you sure? because from what i recall, they were 19#

what color are they?
100% sure. They were black, pencil style. They're not the yellow normal ones from the 5.0. They're taller and skinnier, but still 21#
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Old 10-11-2005, 06:41 PM   #13
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Re: Blow off valve

99+ came with 21# injectors

It is a different type of fuel system however, returnless.
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Old 10-11-2005, 06:44 PM   #14
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Re: Blow off valve

interesting, learn something new every day, i knew it was returnless, i just thought they kept the 19#
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Old 10-11-2005, 06:45 PM   #15
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Re: Blow off valve

So the 94-98 came with what for injectors? Coffee stir straws?
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Old 10-11-2005, 06:48 PM   #16
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Re: Blow off valve

Quote:
Originally Posted by Rellik
So the 94-98 came with what for injectors? Coffee stir straws?
14#

Basically coffee cup straws yes
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Old 10-11-2005, 07:06 PM   #17
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Re: Blow off valve

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Originally Posted by Brent
14#

Basically coffee cup straws yes
but they are fatties. not the pencil style.
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Old 10-11-2005, 07:31 PM   #18
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Re: Blow off valve

i would build the motor you will get more power than if you run a low psi... and you will make the power N/A and then you can run a power adder on top of that. Most see a 3.8l motor with out the bottle or a power adder and think its slow.... lol then they see its tail lights
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Old 10-11-2005, 07:36 PM   #19
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Re: Blow off valve

Quote:
Originally Posted by Monkey
but they are fatties. not the pencil style.
Yea I was just referring to their low output haha
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Old 10-11-2005, 08:34 PM   #20
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Re: Blow off valve

ive got a **** load of 14# injectors laying around if anyone wants them










didnt think so
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Old 10-12-2005, 12:43 AM   #21
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Re: Blow off valve

i'm confused because on his website he gives a choice of HKS or a Tial BOV.
i can't find anything about him using a bypass valve.
maybe i missed something?:dunno:
http://www.tmaturbo.com/racekit.htm.htm
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Old 10-12-2005, 05:01 AM   #22
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Re: Blow off valve

its the same thing, just different applications. BOV is a generic term used by most wannabe t00ners. its technically a Bypass Valve. but people call it(even me) a Blow Off Valve, cause when you let off the gas, it blows off whats left in the intake tract so the turbo doesnt get compressor surge. Compressor Surge is when the throttle plate closes, that rush of air will hit the plate, and bounce back to the turbo. when this happens, it shortens the life of the turbo.

and basically its a given that those asking about how to turbo a naturally aspirated car are already in over their heads.

turboing a non turbo setup is VERY hard and time consuming. you need a manifold with the turbo flange. then you need to hook the exhaust side of the turbo into the exhaust system, more custom stuff.

then you need to mount the wastegate(controls how much boost the turbo runs by bypassing the exhaust gases around the turbo to control it), you can either mount the WG to the exhaust manifold before the turbo and run it to the exhaust system, or the easier way would be to go Internally Gated, the easier way, but less efficient.

then you need to run a oil feed line to the turbo, and run a oil return line from the turbo to the oil pan.

then if the turbo is also water cooled, you must run a water line to the turbo and back into the water system.

then you need to make piping to go from the intake, to the turbo, back out, and to the fmic(if there is one, but its strongly recommended), then to the throttle body.

then before you see any boost, you need definate fuel system upgrades. bigger fuel pump and injectors, and something to tune with.

and like monkey said, a Blo Thru MAF setup is best for turbocharged setups, places the MAF right after the BOV but before the throttle body, that way you can vent the bov without any issues. if using stock maf location(before the turbo inlet) depending on setup, you must recirculate the bov back into the intake after the maf but before the turbo. most stock turbo cars come recirculated, but n00bs vent them for the sound. retarded. any aftermarket bov makes enough noise recirculated for people 100 yards away to hear you. dont be a ricer.

then you need dyno time.

then if you want to go over 7-8psi(im saying 7-8 cause im assuming thats on a stout fuel system and good tune), you will need beefier internals. low compression(7.8-8.5:1 recommended) forged pistons/rods, maybe even a forged crank, get all of those and the block cryo dipped. then after its all put together, better head gaskets and arp headstuds a must, or else under higher boost the head will lift right off the block.

then the last thing is headwork. with a turbo flowing 60+lbs/min, most of the airflow gets choked up in the head. port those summa *****es out, some good *** cams and gears, and youre good to go.

not to mention after all this is said and done, you will have prolly killed a few trannies, clutches, rear ends, etc.
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Old 10-12-2005, 07:34 AM   #23
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Re: Blow off valve

^nice explaination
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Old 10-12-2005, 02:10 PM   #24
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Re: Blow off valve

not everyone was born with the turbo knowledge like you... his kits cover everything in your long winded explanation.
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Old 10-12-2005, 04:42 PM   #25
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Re: Blow off valve

Quote:
Originally Posted by I_luv_HP&trq
i'm confused because on his website he gives a choice of HKS or a Tial BOV.
i can't find anything about him using a bypass valve.
maybe i missed something?:dunno:
http://www.tmaturbo.com/racekit.htm.htm
email him or something because Tial only makes VTA BOVs. So his setup may place the MAF in a new location or something.

If he had the MAF right before the TB, then you could do a standard atmospheric blow off valve and not worry about the idle and richness factors.

The HKS one that he sells is the SSQV. That bov has the option of running VTA or Recirc depending on how you mount it.
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Old 10-12-2005, 04:48 PM   #26
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Re: Blow off valve

After looking at that page, he places the MAF after the BOV, so you are running a VTA BOV.

He even places the BOV before the intercooler.
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Old 10-12-2005, 05:41 PM   #27
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Re: Blow off valve

yeah monkey i heard of quite a few people doing that now.
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Old 10-12-2005, 05:42 PM   #28
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Re: Blow off valve

Quote:
Originally Posted by I_luv_HP&trq
not everyone was born with the turbo knowledge like you... his kits cover everything in your long winded explanation.
lol no i wasnt born with it. before i got my dsm i was just as dumb as anyone else when it came to turbos, but 2 years in the dsm world and turbo's become second nature.
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Old 10-12-2005, 08:19 PM   #29
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Re: Blow off valve

Quote:
Originally Posted by Monkey
After looking at that page, he places the MAF after the BOV, so you are running a VTA BOV.

He even places the BOV before the intercooler.
i don't have all the turbo lingo down. what does VTA stand for? is there a disadvantage/advantage of where the MAF is placed?
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Old 10-12-2005, 10:26 PM   #30
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Re: Blow off valve

Quote:
Originally Posted by I_luv_HP&trq
i don't have all the turbo lingo down. what does VTA stand for? is there a disadvantage/advantage of where the MAF is placed?
VTA = vent to atmosphere

It doesn't really matter where the MAF is mounted. If you move it closer to the throttle body, it allows you to run an atmospheric blow off valve. If you were to put the MAF at a distance and put the blow off valve after the MAF, you would need to run a recirculating bypass valve so you don't blow off metered air causing you to run rich.
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Old 10-12-2005, 10:38 PM   #31
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Re: Blow off valve

ok i think i got it now.... so when the MAF is right after the BOV, the air that it's releasing is sensed by the maf and therefore tells the cars computer that it needs more fuel to compensate all that air?
and having it nearer my TB i would have a better A/f mixture and less fuel consumption because that extra pressure is released, right?

sorryi know this is redundant but i like to know 110% what's really going on.
thanks
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Old 10-12-2005, 11:45 PM   #32
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Re: Blow off valve

the problem is, running a blow through MAF requires a MAF made for that setup, and it require even more tuning

quite a few guys run draw through MAFs since the factory ones were designed to work that way, and even the VAM (mechanical version of the MAF) is used in a draw through manner
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Old 10-13-2005, 06:35 AM   #33
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Re: Blow off valve

www.howstuffworks.com

Read all that about turbochargers
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