[urq] Urq, WX, Head Problems, etc.

[Steve Eiche]

Are you still running the MAC-02 for timing?  The reason that I ask is 
that IME, you will need some serious retuning of the ignition maps with 
increased boost and 8.5:1 compression or you are going to have big 
detonation problems.  The stock system is all wrong for that 
configuration. You will get it to run OK off boost, and on when it is 
cold, but once the intake temps get high the stock maps can't handle it 
and even to tune it properly you need to sacrifice some performance to 
keep it safe.  You will also likely have pinging at ~3k RPM on the 
transition to boost that will need to be taken care of.

Hopefully you have the Megasquirt 'n Spark so you have a better ignition 
system and control.

Steve



------ I have been having some work done on my '85urq.   While on the 
dyno, after parts had been replaced and fab'd, etc. ,  there was 
detonation..  The engine is now apart.  Pistons have been purchased, 
(Wisco) and the head and block or at the machinist.   The machinist says 
that the valves and guides are out of tolerance and need replacement . 
  Also , the cam journals are not properly aligned and must be rebored, 
(approx. extra  $190.). The shop mechanic handling everything suggested 
a new head or equivalent .     What would be an equivalent replacement 
head and approx.  cost to make it fit...?    I am thinking that I would 
be better off just continuing with the existing head repair, even though 
the machinist says it might now go thru another  rebuild as it has 
already been worked on previously.   So the present repair , he suggests 
, would likely be the last one...   I have already had a front mount 
intercooler installed , bought a new turbo, had a tube header made, new 
down pipe, EFI (Megasquirt) and new Ron Davis Radiator, and other 
related details.   I had thought of getting a 3B engine and having him 
install it, but that would probably cost a lot more and many or most of 
the current parts would not fit.    I sure would appreciate some 
suggestions and "how to's" to make my decision.   Another head might 
need new valves and guides and new lifters and would cost to ship, from 
wherever and cost to be disassembled , manifolds might not fit, etc. , 
   So I am thinking ;  just repair what I have and get the car on the 
road.   Thanks in Advance,    Stephen Redford  '85Urq  Seattle