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redbull660
Well-known member
I have a 2008 nytro with a turbo, can someone tell me how the blow off valve works and what its purpose is. It came with a couple different springs to try.
turbo blow off valve question?????
- Thread starter redbull660
- Start date
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Snowstar
Well-known member
The blow off valve releases boost pressure when the throttle closes. This dumps boost to keep the turbo spooled for better throttle responce and prevents boost spikes that can damage the motor and turbo. The blow off valve should be plumbed to a port AFTER the throttle bodies so it can see vacuum when the throttle closes.
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redbull660
Well-known member
So the spring pressure has alot to do with the way it will perform, rite? I have a couple of different springs for it, I guess I am just going to have to ride it and see which one works the best and gives me the best throttle response.
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redbull660
Well-known member
Ok....... so am I looking for more or less vacuum? My boost gauge has a vacuum reading on one side and a boost reading on the other side. If I had to guess I will be looking for more vacuum at idle. I am new to this so any extra tips would be great. thanks
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zebiraross
Well-known member
You want to use the softest spring you can that won't leak if you do a pressure test. If the spring is to stiff your bov won't open under part throttle low boost levels and you'll get compressor surge. Compressor surge is the main reason you want a bov. It is when your turbo is spinning the right way, let off throttle and your bov doesn't open. When your throttle bodies or carbs close you have the turbo still spinning but the air with no where to go but you still have your turbo spinning. With that compressed air not being able to go the right way (into the motor) it pushes back on the turbo and violently makes the turbo spin the opposite wrong direction. This is very bad on turbo bearings.
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1CrazySledder
New member
I have one on my Supercharged Attak. I had to cut a few of the coils off of the spring to allow the BOV to work properly. Just a thought for you....you may or may not have to modify the springs.
1CS
1CS
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Lunch_Box
Member
You don't adjust your vacuum. Start up your sled, see what vacuum the gauge reads at idle, choose a spring that correspond with your reading.
What kind of bov do you have?
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redbull660
Well-known member
The turbo is from NW Turbo Works, and the blow off valve says " Turbo X S" on it. Hope this helps, the turbo company said that they had to cut the spring shorter in some cases, it all depended on the sled. This does not really help me much because I need to know what kind of simptoms to look for if its working properly or not when it comes time to dial it in.
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Boost Addict
Member
Cutting the spring will reduce preload but actually increase the spring rate so it would be best to install a softer spring of the correct length if it actually needs it. If you can detect the BOV opening any time you let off of the throttle then it is functioning. If it only blows off when you slam the throttle shut from wide open throttle then you probably need a softer spring.
By the way... Zeb has no idea what he is talking about!
Brad
By the way... Zeb has no idea what he is talking about!
Brad
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redbull660
Well-known member
I think his name is Jeb, but anyway where do I get an assortment of springs. I am trying to make this kit better, I guess I cant complain to much it only cost me $4000 this summer. Its alot of money but I was on a budget.
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redbull660
Well-known member
I know this is not the most updated and powerful kit but it was all I could afford, I really wanted someting like a powderlites kit but it was out of my price range. So I would like your guys help to make this kit a "good enuf" kit. I had to redo some fittings and make a new exhaust and do some cutting on the tunnel so the exhaust manifold had room to move around. It is a good kit but I need some more info on how things work.
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lightening800
Well-known member
spring
why dont you try thr one that came with it?? Mine works flawless with the spring the kit comes with.
why dont you try thr one that came with it?? Mine works flawless with the spring the kit comes with.
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redbull660
Well-known member
I am going to try the one that it came with, I was told by them guys that I might need to change the spring. I just wanna know what to expect if the spring is to agressive or to weak. I have never had a turbo before and am wanting to get some tips on what to expect. Thanks for the help. 
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zebiraross
Well-known member
Cutting the spring will reduce preload but actually increase the spring rate so it would be best to install a softer spring of the correct length if it actually needs it. If you can detect the BOV opening any time you let off of the throttle then it is functioning. If it only blows off when you slam the throttle shut from wide open throttle then you probably need a softer spring.
By the way... Zeb has no idea what he is talking about!
Brad
For all the love I've shown you and you treat me like this....
