New here, i have some questions

[johnka]

Hi everyone. My name is Jonathan and im new here. First of all sorry about my english because im learning english as a second language.I know that i have some gramatical mistakes sometimes. My question is, i have a volkswagen Golf with a 1.6 turbo diesel engine. Im running with 12 psi, but i like to increase my psi. What things did you recomend me to do with my engine. Another question, i hear about BOV on turbo diesel, does anyone here tries to put one in a 1.6 diesel engine. I apreciate your help. Grettings from Costa Rica    

I saw this interested video of a volkswagen with a BOV on a diesel engine

http://www.youtube.com/watch?v=wUGOfTwy_v8

[Black Smokin' Diesel]

In all honesty, a BOV is pretty useless on a diesel. Standard tuning practices on 1.6TDs is to remove/block the stock bypass valve and installing a manual boost controller to increase PSI.

Interesting video for sure. Don't worry about your english, it's very good.

[johnka]

Thanks man     . My wastegate is not working, i eliminate the hole sistem. One funny thing is that i put a turbo from a galloper 2002, and it works very nice, better than the original, but i like to have more psi on my volkswagen, maybe some other tips  :lol:  :lol:

[rabbid79]

Hi johnka,

Welcome to the forum.  For starters, your English is actually pretty good, so no worries there.  There are others on this forum who can answer your question about boost pressure better than I can, but another thing you will probably want to do after you increase your boost, is to increase your fueling.  Visit the FAQ board for answers to that one.
About the blow-off valve: (What you're really talking about is called a pop-off valve.  A blow-off valve dumps excess air out of the intake manifold to keep boost levels down.  The terms get thrown around so much on the internet, that no one can keep them straight. :? )  While I agree that pop-off valves make a cool sound, and look neat, they really don't serve any useful purpose on a Diesel engine.  The reason they exist in the first place, is to give the pressurized air that is trapped in the piping between the turbo and the throttle plate when it slams shut, someplace to go (usually to the atmosphere), rather than back through the compressor on the turbo.  It's not good for the turbo when this happens.  This is called compressor surge.  It stresses the turbo, slows it down, and doesn't sound very good either.  Installing a pop-off valve on a gas engine helps keep the turbo spooled between shifts.  Now, since you have a diesel engine, and hence no throttle plate, compressor surge cannot occur.  The decision is up to you.  If you like the sound, and the bling, go for it, but it really won't help your performance.  Good luck.

[johnka]

Thanks rabbid, Is very interesting to know why is not useful a BOV on a diesel engine, i know that the sound is great but there is no gain of power. Thaks for your answer, and its a pleasure to be part of this forum  

[HarryMann]

A BOV as installed in the factory is not a preformance item - it's a safety device. It is being confused with a wastegate bleed valve, something else entirely.

The BOV is there to limit boost runaway if the wastegate fails, usually set to about 12 psi on VW TDs, and because peeps like to boost a bit more than that usually, they either block it or remove it and blank the inlet manifold hole off. Else it self defeats the overboost work. I find a wine bottle cork (of the synthetic kind) fits perfectly in the BOV.

A wastegate bleed valve allows you to bleed of pressure to the wastegate solenoid actuator, so that the wastegate doesn't open so early. there are other styles of valve that do much the same thing, that rather than bleed air off all the time, pop at a certain pressure.

It is not a good idea to completely disable the wastegate! Especially if overfuelling to gain the benfits that extra boost can give - you do want it working (esp. if the BOV is blocked off), just not at quite such a low boost pressure (VWs set them up from 7.5 to 12 psi normally). You might want to start at 12 psi and move up to say 15 - 18 deopending, but must overfel to get any real benefit from this

Hope this helps

PS English is spot-on