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

[Stephen Redford]

-----------  Steve , I am running the M.S. with their Spark program.    We did , in fact , get detonation with that program with the original 7;1 stock pistons,  Apparently on one of the first dyno runs with the new header, turbo and intercooler,etc.  The Boosst Controller =not a manual- was hooked up wrong and somewhere in the mid rpm range boost spiked to 27 or 29 Lbs.  before the shop owner could shut it down.   Burned pistons and total engine rebuild is the result, that is why the new pistons are 8.5;1.   Closer to other Audi's stock ratios .   The injectors were from O34, part of a kit which I did not use. They were Ford truck  46lbs.  Shop  owner was sure the injectors were at fault , so I had them  checked... They were dead on spec.  The shop owner said he had been running a very high - near max somewhere -  Duty cycle .   I have decided to get some Siemens 65 or 75 lb. injectors for the rebuild   I am looking forward to a better result this time.  We are shooting for approx.  300++ at the wheels.   The turbo is rated for 396 from Blouch Turbo.   The shop owner told me that some part of the very latest version of Mega Squirt does not run some part of a 5cyl. engine.  So this is the latest minus one or two editions, but it does have the spark code.   Thanks for your input!  Thanks to all who have replied   ..Stephen

  ----- Original Message ----- 
  From: Steve Eiche<mailto:seiche at shadetreesoftware.com> 
  To: shr42 at msn.com<mailto:shr42 at msn.com> ; urq at audifans.com<mailto:urq at audifans.com> 
  Sent: Saturday, May 19, 2007 9:29 AM
  Subject: Re: [urq] Urq, WX, Head Problems, etc.


  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