Dump Valve Kits and more boost

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <199803300712.IAA22106@mailhost.man.brite.co.uk> "Mark Warren" writes:

> Some advice required....
> 
> My WR engined UR-q is shortly due for a major over haul.  The 'its 
> the newness wearing off excuse' for all the oil smoke is wearing a 
> little thin now so its about time to dig deep and get it rebuilt.
> 
> My question is mainly about turbo boost.  My 'proper' gauge shows
> 0.85 bar normally under load, but sometimes goes to 1.0 bar.  Then
> the overboost protection cuts in.  

Uh huh.  Two people in two days with raised boost levels, overboost cutting in  
and oil smoke.  Tony Hill was the other - dead turbo.
 
For the benefit of those who thought about Tony's problem when I posted it - it 
turned out that someone had dismanted the wastegate, removed the bolt holding 
the spring seat in place, and had replaced the bolt with the spring seat just 
sitting on top.  With the nuts undone, the wastegate cap sat 24mm clear of the 
body on my car, 23.6mm on John Robinson's car, and 32mm on Tony's. 
 
> When I've had the engine done I want to get some proper amount of
> boost.  What does anyone think is a reasonable amount of boost
> without comprimising engine life (too much) ? 1.2 / 1.3 bar ? How can
> I stop the overboost protection cutting in ?

First of all - ask yourself what it's there for.

-- 
Phil Payne