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Old Dec 29, 2008 | 07:23 PM
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Default Twin Turbo Kit Questions

Hey everybody,
I am new here and I have a few questions. I am looking at a turbo kit for my 2008 350z and the only one I have found is by GReddy. Since the HR engines use a dual throttle system, this is the only turbo kit available for the 07 08 year model Zs. However, as I was looking at the details of the turbo kit, it didn't appear to have either a blow-off valve or a bypass valve. If I purchase this kit, will I need to also purchase one of these valves or are they not necessary. I know this is kind of a noob question but please any help will be greatly appreciated. Im kinda new to the whole forced induction aspect of cars. Thanks
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Old Dec 29, 2008 | 07:29 PM
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https://my350z.com/forum/forced-indu...ion-noobs.html

You are going to get crushed in here, if you don't use the search feature
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Old Dec 29, 2008 | 07:52 PM
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search//thread/death
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Old Dec 29, 2008 | 07:53 PM
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Originally Posted by craigo'sznprgrs
https://my350z.com/forum/forced-indu...ion-noobs.html

You are going to get crushed in here, if you don't use the search feature
I read that thread and didn't see anything about BOV or BPV. Here is a link to the turbo kit I was originally talking about: http://www.350zmod.com/ProductDetail...GRE%2011520094

Please take a look and see if you can figure out what is going on in regards as to whether or not this kit runs a BOV or a BPV.
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Old Dec 29, 2008 | 08:22 PM
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Both Greddy and GTM make turbos for your car. Here are some links. (I would have actually given you the link to the turbo system on GTMs website, but their website is a little slow. Nonetheless, it is there.)

http://www.importpartspro.com/gr20gtutwtuk.html

http://www.forgedperformance.com/sto...cat=467&page=1

http://www.gtmotorsports.com/
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Old Dec 29, 2008 | 08:37 PM
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Originally Posted by ttg35fort
Both Greddy and GTM make turbos for your car. Here are some links. (I would have actually given you the link to the turbo system on GTMs website, but their website is a little slow. Nonetheless, it is there.)

http://www.importpartspro.com/gr20gtutwtuk.html

http://www.forgedperformance.com/sto...cat=467&page=1

http://www.gtmotorsports.com/
I am aware that there are turbo kits available for the 07-08 year model 350Zs. My question was regarding whether or not the GReddy Twin Turbo kit used a BOV or BPV as from my knowledge from what I've read on GReddy's website, it wasn't stated which was used to prevent a compression surge. Could it be possible that neither a BOV or BPV is used???
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Old Dec 29, 2008 | 08:52 PM
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Originally Posted by abcxyz
I am aware that there are turbo kits available for the 07-08 year model 350Zs. My question was regarding whether or not the GReddy Twin Turbo kit used a BOV or BPV as from my knowledge from what I've read on GReddy's website, it wasn't stated which was used to prevent a compression surge. Could it be possible that neither a BOV or BPV is used???
As far as I've seen, most people are using BOVs with Greddy kits. Actually, I don't remember seeing anyone here using a BPV. My Greddy kit did not come with a BOV either, but BOVs are relatively inexpensive. I went with a Tial, which seems to be a pretty popular choice, but you can use BOVs from any of a number of other manufacturers. I think Greddy even makes one. If you use the advanced search feature, you should be able to find information about the different BOVs that are available.
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Old Dec 29, 2008 | 09:09 PM
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Originally Posted by ttg35fort
As far as I've seen, most people are using BOVs with Greddy kits. Actually, I don't remember seeing anyone here using a BPV. My Greddy kit did not come with a BOV either, but BOVs are relatively inexpensive. I went with a Tial, which seems to be a pretty popular choice, but you can use BOVs from any of a number of other manufacturers. I think Greddy even makes one. If you use the advanced search feature, you should be able to find information about the different BOVs that are available.
Last question: Do you need a BOV or BPV in order for a turbo kit to operate effectively and efficiently???
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Old Dec 29, 2008 | 09:22 PM
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Originally Posted by abcxyz
Last question: Do you need a BOV or BPV in order for a turbo kit to operate effectively and efficiently???
You should use a BOV:

e.g. http://www.streetracersonline.com/ar.../turbo/bov.php

Last edited by ttg35fort; Dec 29, 2008 at 09:24 PM.
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Old Dec 29, 2008 | 09:32 PM
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Originally Posted by ttg35fort
Hmm, but according to the article you provided to me it seems like a BOV is NOT the way to go. My Z is my daily driver car and I don't want it running rich all day long. What could one do to make it so their BOV doesn't cause their engine to run rich??? or is this problem unavoidable???
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Old Dec 29, 2008 | 09:34 PM
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Someone lock this **** now!! OP dont buy a bov, you can go without it!! Please buy and install a greddy tt yourself and run 22psi safely with no ems..
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Old Dec 29, 2008 | 09:41 PM
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Originally Posted by abcxyz
Hmm, but according to the article you provided to me it seems like a BOV is NOT the way to go. My Z is my daily driver car and I don't want it running rich all day long. What could one do to make it so their BOV doesn't cause their engine to run rich??? or is this problem unavoidable???
HELLO

"The reason for this is that the turbocharger will keep spinning even after you let off the gas. So as you close the throttle plate, allot of pressure builds up in the intake system. This becomes problematic in that this excess pressure can cause the turbines to seize..."

This forum is not for you. It's time to move on...
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Old Dec 29, 2008 | 09:47 PM
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Originally Posted by ttg35fort
HELLO

"The reason for this is that the turbocharger will keep spinning even after you let off the gas. So as you close the throttle plate, allot of pressure builds up in the intake system. This becomes problematic in that this excess pressure can cause the turbines to seize..."

This forum is not for you. It's time to move on...
OMG!!! Not for me!?! You never even answered my question. Maybe this forum is actually not for YOU!!! Whatever, thanks for the help you provided.
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Old Dec 29, 2008 | 09:56 PM
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If you quit being lazy and properly use the search feature of this site and use Google, you will find answers to your questions. I'm done.

And yes, this forum is for me because I never came on here asking dumb @ss questions. I researched the h*ll out of everything before I ever made my first post.
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Old Dec 29, 2008 | 10:02 PM
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Originally Posted by Jay'Z
Someone lock this **** now!! OP dont buy a bov, you can go without it!! Please buy and install a greddy tt yourself and run 22psi safely with no ems..
waahahahaha 22psi huh !
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Old Dec 29, 2008 | 10:11 PM
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Originally Posted by Jay'Z
Someone lock this **** now!! OP dont buy a bov, you can go without it!! Please buy and install a greddy tt yourself and run 22psi safely with no ems..
Well said.

I'm starting to see why XKR quotes Alberto in his sig:

Originally Posted by Alberto
Big numbers, lack of mental capacity, small budget, no driving skills, and no common sense is what us regulars have to deal with daily inside the FI forums.

Last edited by ttg35fort; Dec 29, 2008 at 10:15 PM.
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Old Dec 30, 2008 | 12:29 AM
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this is easy but seriously noob question.

You can run without bov, but you should not. The pressure surge without bov can harm turbos, blow off couplers, or even snap a throttle shaft.

The only possible negative side effect of a bov exists only on cars with some type of airflow meter. If you blow off air that was metered, the car will run rich while the bov briefly opens. Most people don't care if the car spikes rich momentarily when they let off throttle. Good news is, a Greddy tt 350z runs the maf sensors on the pressure side of the intake piping... So if you put your bovs, you will need two for the hr, inbetween the turbos and ic you will not suffer these effects because the air hasn't been metered yet.
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Old Dec 30, 2008 | 04:18 AM
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Seriously, you need to use the search function ASAP! You just threw yourself into a lion's den.. F/I section is one of the most brutal/rude sections of all in my350z.com. Regulars will EAT you alive if you keep at it... $h1t, when I was a noob, I logged on to this section for several months searching, reading and learning before I posted a single question... There are plenty of good info in here if search... Go to howstuffworks.com (great place to learn how turbo and its components work BTW) and quietly educate yourself, read all the stickies and comeback when you know what the hell BOV does...

Last edited by leeboyNY; Dec 30, 2008 at 04:33 AM.
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Old Dec 30, 2008 | 05:12 AM
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As far as I've seen, most people are using BOVs with Greddy kits. Actually, I don't remember seeing anyone here using a BPV. My Greddy kit did not come with a BOV either, but BOVs are relatively inexpensive. I went with a Tial, which seems to be a pretty popular choice, but you can use BOVs from any of a number of other manufacturers. I think Greddy even makes one. If you use the advanced search feature, you should be able to find information about the different BOVs that are available.
You can run without bov, but you should not. The pressure surge without bov can harm turbos, blow off couplers, or even snap a throttle shaft.

The only possible negative side effect of a bov exists only on cars with some type of airflow meter. If you blow off air that was metered, the car will run rich while the bov briefly opens. Most people don't care if the car spikes rich momentarily when they let off throttle. Good news is, a Greddy tt 350z runs the maf sensors on the pressure side of the intake piping... So if you put your bovs, you will need two for the hr, inbetween the turbos and ic you will not suffer these effects because the air hasn't been metered yet.
Question has been answered in laymans terms and then again in technical terms - /thread!!

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Old Dec 30, 2008 | 06:16 AM
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Nice GIF. Mind if I borrow it for the next time.
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