Opinionated people
Well, since you ask, I'll "opinionate".
The primary reason they don't have one is because the "primary" reason for a bov is to keep the turbo from loosing ALL boost on the shifts, in a manually shifted car. In a car with a manual tranny a bov is an absolute MUST!!!
Some folks are of the opinion that they're needed to save the turbo from self destructing. I always raise the BS flag on that one. I've owned my 86 from day one (some 18 years now) and have never EVER seen the need for one, on mine or friends cars.
The original stock turbo that came off my car is still working just fine on another one (120,000+ miles when removed). The TA49 that I had on it for a while is going good on my wife's 87. It had over 40,000 when I decided to change from the carbon seals to dynamic seals (wasn't really needed. turbo had to be rebuilt because parts of a champion spark plug ate the turbine wheel). My present TE44 has something like 20,000 (mostly race) miles and it's working perfectly (seals perfect).
I personally have seen zero evidence that a bov is in any way needed on our cars. I have however seen plenty of turbo's go bad in these T/R's but in the cases I've seen, the maintenance schedule maintained by the owner was questionable at best.
Keep your oil and filter(good one, no fram crap) changed every 3,000 miles, keep crap out of the engine and the whole assembly, turbo and all will be much happier.
And all that money otherwise wasted on a bov could be better spent elsewhere.
There is some REAL opinionated people when it comes to this subject.
