I heard that you could adjust the blow off valve to increase the pressure on some turbos. Is that possible to do on the 1.9L TDI's?
Adjusting the Blow Off Valve
jigggity
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Re: Adjusting the Blow Off Valve (jigggity)
TDIs don't have BOVs
only something remotely like that is a manual boost controller. But this is to control Boost spikes/overboosting. Need more boost? Get your ECU chipped by http://www.rocketchip.com. You will be merry.
![Image]()
| Quote, originally posted by jigggity » |
| I heard that you could adjust the blow off valve to increase the pressure on some turbos. Is that possible to do on the 1.9L TDI's? |
TDIs don't have BOVs
only something remotely like that is a manual boost controller. But this is to control Boost spikes/overboosting. Need more boost? Get your ECU chipped by http://www.rocketchip.com. You will be merry.
if you do get a chip, I'd highly recommend a boost control valve. Your turbo will thank you later.
http://www.boostvalve.com
http://www.boostvalve.com
Re: (jigggity)
We have just finished our two-year development of vehicle specific electronically-controlled blow-off valve kits for the VAG group diesel vehicles.
They should be available for purchase very soon!
![Image]()
Let me know if you have any more specific questions or concerns!
We have just finished our two-year development of vehicle specific electronically-controlled blow-off valve kits for the VAG group diesel vehicles.
They should be available for purchase very soon!
Let me know if you have any more specific questions or concerns!
Re: (Mike@ForgeMotorsport)
What is the purpose of that kit? Just to make a cool sound?
| Quote, originally posted by Mike@ForgeMotorsport » |
| We have just finished our two-year development of vehicle specific electronically-controlled blow-off valve kits for the VAG group diesel vehicles. They should be available for purchase very soon!
Let me know if you have any more specific questions or concerns! |
What is the purpose of that kit? Just to make a cool sound?
Oh boy ...
A blow-off valve of the type used on some gasoline engines has no place on a diesel engine and serves no function from the point of view that I am not concerned with making noise - only power.
If someone would care to prove me wrong via independent dynamometer tests, or to loan me such a piece so that I can perform such tests, I am fully prepared to retract the statement made above. (I don't think I'll have to ...)
A *mechanical boost controller*, on the other hand, CAN serve an important function but it is an entirely different device from a blow-off valve.
I think we'd better end this discussion right here. I recognize the Forge Motorsport name - but I still maintain that a blow-off valve serves no useful function on a diesel ...
A blow-off valve of the type used on some gasoline engines has no place on a diesel engine and serves no function from the point of view that I am not concerned with making noise - only power.
If someone would care to prove me wrong via independent dynamometer tests, or to loan me such a piece so that I can perform such tests, I am fully prepared to retract the statement made above. (I don't think I'll have to ...)
A *mechanical boost controller*, on the other hand, CAN serve an important function but it is an entirely different device from a blow-off valve.
I think we'd better end this discussion right here. I recognize the Forge Motorsport name - but I still maintain that a blow-off valve serves no useful function on a diesel ...
Re: (GoFaster)
I'm not here to argue over the "benefits" of a blow-off valve.
I never said it added any performance nor anything of the like, and I also never confused it with a manual boost controller.
We have often been asked for a blow-off valve for numerous diesel applications, so we developed one.
Period!
If there wasn't any interest in it, we wouldn't have spent the time working on it.
I'm not here to argue over the "benefits" of a blow-off valve.
I never said it added any performance nor anything of the like, and I also never confused it with a manual boost controller.
We have often been asked for a blow-off valve for numerous diesel applications, so we developed one.
Period!
If there wasn't any interest in it, we wouldn't have spent the time working on it.
Re: (TDIRyan)
Could you quickly explain how this works on a diesel car please? What exactly is it intended to do, and how is it installed/setup?
Correct me if wrong, isnt the main reason for such a modification to prevent overboost (boost higher than desired) or overshoot(temporary inertial overboost), not so much lag? If anything, the way this device appears to eliminate lag would seem to INCREASE overshoot tendency. How does this device reduce overboost or overshoot?
The diagram here:
http://www.boostvalve.com/tech/IC_install.html
...is not very professionally written, and is confusing.
I find it hard to believe that this simple mechanical spring device will provide better boost control than the ECU.
| Quote, originally posted by TDIRyan » |
| if you do get a chip, I'd highly recommend a boost control valve. Your turbo will thank you later. http://www.boostvalve.com |
Could you quickly explain how this works on a diesel car please? What exactly is it intended to do, and how is it installed/setup?
Correct me if wrong, isnt the main reason for such a modification to prevent overboost (boost higher than desired) or overshoot(temporary inertial overboost), not so much lag? If anything, the way this device appears to eliminate lag would seem to INCREASE overshoot tendency. How does this device reduce overboost or overshoot?
The diagram here:
http://www.boostvalve.com/tech/IC_install.html
...is not very professionally written, and is confusing.
I find it hard to believe that this simple mechanical spring device will provide better boost control than the ECU.
Re: (GoFaster)
Suffice to say the Forge unit is filling a market demand for "bling" then.
GoFaster, can you please explain the answer to my previous question above, or provide a good link? The search feature here is broken. I just recall that you have some sort of overshoot controller on your TDI, yes? The term "Dawes" device comes to mind.
I'm confused, but intend to install a chip (again, after a previous failure) and want to prevent any possible damage this time around. Thanks.
| Quote, originally posted by GoFaster » |
| Oh boy ... A blow-off valve of the type used on some gasoline engines has no place on a diesel engine and serves no function from the point of view that I am not concerned with making noise - only power. If someone would care to prove me wrong via independent dynamometer tests, or to loan me such a piece so that I can perform such tests, I am fully prepared to retract the statement made above. (I don't think I'll have to ...) A *mechanical boost controller*, on the other hand, CAN serve an important function but it is an entirely different device from a blow-off valve. I think we'd better end this discussion right here. I recognize the Forge Motorsport name - but I still maintain that a blow-off valve serves no useful function on a diesel ... |
Suffice to say the Forge unit is filling a market demand for "bling" then.
GoFaster, can you please explain the answer to my previous question above, or provide a good link? The search feature here is broken. I just recall that you have some sort of overshoot controller on your TDI, yes? The term "Dawes" device comes to mind.
I'm confused, but intend to install a chip (again, after a previous failure) and want to prevent any possible damage this time around. Thanks.
I take it that you are asking about the mechanical boost controller because you are genuinely interested, not because you are going to twist whatever I say around and use it against me, like a certain other character who has been seen around these forums ... !!!
Anyway, it has been found many times over that the ECU-controlled N75 valve does not react quickly enough in hot-rodded applications, and when it does react, the control strategy does too much and boost goes down too far. Overshoot, undershoot (and a big cloud of smoke!), then maybe it stabilizes or maybe not.
With the big injectors on the Passat (same engine as yours - different ECU though) boost control was very unstable using only the N75 valve. With the mechanical controller, it is rock solid. I can tramp the accelerator right to the floor at 3000 rpm, and the boost gauge goes to 17 psi and stays there. No overshoot. (Note, on VNT applications you can't get rid of the overshoot completely, but it's a lot better than without the boost controller.)
There's another side of it ... "redundancy". With everything stock, even if the N75 or wastegate stick closed, there simply isn't enough exhaust energy to break anything. If it's hot-rodded, you can get some *serious* boost spikes if things go awry. Having both the N75 and the mechanical controller (and a boost gauge as a third level of redundancy) reduces the chances of blowing that turbo to smithereens.
It took some fiddling to get my Dawes adjusted right in the beginning, but since then, I have never had to touch it, and that's almost 200,000 km ago.
Anyway, it has been found many times over that the ECU-controlled N75 valve does not react quickly enough in hot-rodded applications, and when it does react, the control strategy does too much and boost goes down too far. Overshoot, undershoot (and a big cloud of smoke!), then maybe it stabilizes or maybe not.
With the big injectors on the Passat (same engine as yours - different ECU though) boost control was very unstable using only the N75 valve. With the mechanical controller, it is rock solid. I can tramp the accelerator right to the floor at 3000 rpm, and the boost gauge goes to 17 psi and stays there. No overshoot. (Note, on VNT applications you can't get rid of the overshoot completely, but it's a lot better than without the boost controller.)
There's another side of it ... "redundancy". With everything stock, even if the N75 or wastegate stick closed, there simply isn't enough exhaust energy to break anything. If it's hot-rodded, you can get some *serious* boost spikes if things go awry. Having both the N75 and the mechanical controller (and a boost gauge as a third level of redundancy) reduces the chances of blowing that turbo to smithereens.
It took some fiddling to get my Dawes adjusted right in the beginning, but since then, I have never had to touch it, and that's almost 200,000 km ago.
Re: (GoFaster)
Good info. Thanks. Also interesting that you suggest that the smoke is a result of inadequate boost stabilization speed. Do you have any links to good informative discussion? I havent checked TDIclub yet.
I remember my Upsolute chip peaked at like 23psi or more, then stabilized in the high teens. Will such a device as we are discussing work well in conjunction with a chip? Will this device allow me to manually limit the boost/power below the levels programmed into the chip? I'm looking at getting a Rocketchip.
Modified by RogueTDI at 5:50 PM 6-5-2005
Good info. Thanks. Also interesting that you suggest that the smoke is a result of inadequate boost stabilization speed. Do you have any links to good informative discussion? I havent checked TDIclub yet.
I remember my Upsolute chip peaked at like 23psi or more, then stabilized in the high teens. Will such a device as we are discussing work well in conjunction with a chip? Will this device allow me to manually limit the boost/power below the levels programmed into the chip? I'm looking at getting a Rocketchip.
Modified by RogueTDI at 5:50 PM 6-5-2005
Re: (RogueTDI)
Call it what you will, but as I previously stated, we seen significant interest in this product from numerous retail customers and dealers alike.....
..... and for other applications.
This particular product is not solely intended for the VW Group TDI applications. We only currently have vehicle specific fitting kits for those applications, though we are working on more.
If any of you are not interest in this product, fine, but there are people that are.
| Quote, originally posted by RogueTDI » |
| Suffice to say the Forge unit is filling a market demand for "bling" then. |
Call it what you will, but as I previously stated, we seen significant interest in this product from numerous retail customers and dealers alike.....
..... and for other applications.
This particular product is not solely intended for the VW Group TDI applications. We only currently have vehicle specific fitting kits for those applications, though we are working on more.
If any of you are not interest in this product, fine, but there are people that are.
You need to check out this discussion for details on a BOV for a TDI.
short version: get the boostvalve and realize that the BOV does nothing on a TDI
"FAQ:
"Since people insist upon asking about these devices, they need to be discussed ... The purpose of a "blow-off valve" or "diverter valve" on a gasoline engine is to give boost pressure someplace to go when the throttle plate is abruptly closed, to prevent operating the compressor in the "surge" regime. Since a diesel engine doesn't have a throttle plate, a gadget like this serves absolutely no purpose and has no business anywhere on a diesel engine. "But I like the cool noise ..." Too bad, this discussion is focused on things that WORK. Even if you manage to find some way to make such a device work, the noise of people "in the know" laughing at you because they realize that it has absolutely no place on your engine will drown out the noise that the device itself makes.""
http://forums.tdiclub.com/show...22992
Modified by TDIRyan at 9:49 AM 6-6-2005
short version: get the boostvalve and realize that the BOV does nothing on a TDI
"FAQ:
"Since people insist upon asking about these devices, they need to be discussed ... The purpose of a "blow-off valve" or "diverter valve" on a gasoline engine is to give boost pressure someplace to go when the throttle plate is abruptly closed, to prevent operating the compressor in the "surge" regime. Since a diesel engine doesn't have a throttle plate, a gadget like this serves absolutely no purpose and has no business anywhere on a diesel engine. "But I like the cool noise ..." Too bad, this discussion is focused on things that WORK. Even if you manage to find some way to make such a device work, the noise of people "in the know" laughing at you because they realize that it has absolutely no place on your engine will drown out the noise that the device itself makes.""
http://forums.tdiclub.com/show...22992
Modified by TDIRyan at 9:49 AM 6-6-2005
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Re: (Mike@ForgeMotorsport)
Cool. Anything to make a quick buck from the suckers, right?
![Image]()
Cool. Anything to make a quick buck from the suckers, right?
Re: (Mike@ForgeMotorsport)
Yeah. No need to make snide remarks. Let the free market work as it will.
Speaking of which, I believe there's an audio/speaker solution to this desire for the characteristic blow off noise on a diesel. All electric, no plumbing required.
Yeah. No need to make snide remarks. Let the free market work as it will.
Speaking of which, I believe there's an audio/speaker solution to this desire for the characteristic blow off noise on a diesel. All electric, no plumbing required.
Re: (RogueTDI)
The original poster specifically asked about BOV adjustments to increase turbo pressure, or in other words, increasing performance.
The BOV being discussed above does NOT meet this increased performance requirement, by the vendor's own admission, so I fail to see why it was even mentioned...?
![Image]()
The original poster specifically asked about BOV adjustments to increase turbo pressure, or in other words, increasing performance.
The BOV being discussed above does NOT meet this increased performance requirement, by the vendor's own admission, so I fail to see why it was even mentioned...?
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