Do they make a blow off valve for a diesel. I run them on my cars since they are turbo. But with this big turbo i put on i don't feel like killing it and as far as i know the pressure backing out through the turbo is not good for it.

I'm hoping they do. But I just don't want the PSST sound that my cars leave. I want a nice smooth sound that really isn't noticeable.

I've searched the internet but didn't come up with much. I'm guessing something in this area will cost around 500 bucks and I would take a guess that it would have to be computer controlled thats why I do not know if they are made for a first Gen diesel as for the most part they run off vacuum and our diesel do not have much electronics on them to control it unless it would be somehow ran off the TPS.

If someone would know a link to a site that sells that it would be awesome.

Thanks,
Dean Snow

 

bd has a blow off valve i have one on my 99 it works alright you have to tune it, it takes a little while

 

What kind of turbo are you running? Does it not have a wastegate on it?

 

You don't really need a blow off valve on a diesel. As I'm sure you know there is/are no throttle valve(s) so when you let off the throttle the boost will still go through the cylinders. The only thing that a blow off valve will do on a diesel is cause the engine to rev down a slight bit quicker, but you really don't want that when your shifting.

 

yes the turbo has a waste gate, but a waste gate will not let the air pass through it after i let off the pedal, as bigone said, some goes through the cylinders and some goes back out the turbo making the barking sound. My turbo doesn't do the barking sound but with it letting off 45+lbs of boost it makes a funny noise out the turbo and its still hard on it. I didn't run a blow off valve on my car and it ruined a garett turbo within a year of running it at 35 lbs of boost. The turbo i have on my truck is way to expensive to replace if i had to buy it new. So im willing to spend upwards of 500 dollars for a blow off valve. Ive been dealing with gas turbo cars since i was 14 and i have been through trial and error and don't want to do that again on my diesel.

 

Well, you run an auto, so IMO, I'd just run without one. If you were running a manual I'd say it would be worth it. Just try and not to let off the loud pedal really fast. I understand that this may not be possible in an emergency situation, but those don't happen too often, and I'm sure the turbo can take a few barks in it's life. Just wouldn't want to make it a regular thing.

 

What is turbo bark? I thought it was something over-fueled smaller turbos had issues with? Is this "bark" possible with all of the new hight tech turbos out there?

 

yes my turbos bark on my 99, its when the air between the valves and the turbo has no were to go. the turbocharger compressors keep pushing air and the engine uses less air like from 60 psi at 3100 rpm you let off the throttle and (2000 rpm) and the 60 psi in the system is still be pushed by the chargers but the engine is rotating as fast and cant suck down the 60 psi. the pressure spikes and has no were to go so it gos back out the way that it came the turbo chargers. a blow off valve such as the bd turbo guard is a electronic servo actuated blow off valve that mounts on the intercooler pipe ( drivers side) it uses sensors such as the tps, etc.... when you lift off the throttle the electronic solenoid kicks and the bov ( blow off valve ) opens and lets a small amount of air out so the compressed air does not go back out the turbocharger causing turbo bark. they have 6 factory settings but none of them worked for me so i had to adjust it and adjust but it does work it makes alot of noise on you let off at 80 psi but it works.

 

I think JEGS has one for like 600.

 

A turbo will only bark if you let off the throttle HARD. Let it off easily and your turbos will be happy.

 

I asked this exact question (about turbo bark and blow off valves) a while back in the general section. Turbo bark is when you are build ing boost and defuel your engine suddenly. The boost forces its self back past the compressor. Ever watch a truck pull and here the high pitch "chuff- chuff- chuff-chuff" when they reach the end??? that is turbo bark, The boost can actually stall the turbo and force it backward. In extreme cases it can bend the shaft, damage the bearings, etc....

Some say its OK once in awhile but if it can damage it once, once is enough. Watergate's dump excess exhaust back pressure to control boost build up if I am not mistaken (I could be wrong)

If I remember correctly, if you build 30 psi or more, bark becomes a problem. A blow-off valve will prevent it. The cheaper way is to always slowly de-rev the motor to utilize the extra boost. But with an emergency defuel it will bark hard at high boost.

I say if you are worried, and making plenty of boost, get one. I plan on it down the road my self. Mostly because if you can prevent damage you should, but its also cool to say I have a turbo with a blow off valve to the ricers!

Anyway hope I didn't stuff my foot in my mouth, I just learned all this stuff.

 

Isn't just the same thing as surging?

 

Why not just wire a switch to the clutch or go pedal and you could just turn it on and off when you need/want it?

 

Yes, just more extreme. There is not enough airflow through the turbo to support the pressure.