200T Head Gasflow?

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

In message <34BC593E.D44170FB@reutech.co.za> rmeyer.rdi@reutech.co.za (Renier Meyer) writes:

> My car's head has just been removed to redo valve seals.
> My questions are:
> 
> 1) Is it worthwhile to gas flow the head
> 2) What are the gains in hp realistically?
> 3) Is there some specialist knowledge available about the profile and
> what needs to be done?
> 
> Please let me know if someone has done something similar.

John Robinson has gasflowed his MB engine and finds that performance has 
_suffered_ as a result.  If you put more air in, ya gotta put more fuel in to 
keep the mixture right.  That's basically controlled by the air mass sensor (up 
to a point) and then by the ECU.  How do you tell the ECU that more air is 
going in for a given boost level?  The ECU is not connected to the air mass 
sensor. 

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club