[s-cars] [urq] Urq, WX, Head Problems, etc.

[QSHIPQ at aol.com]

I've seen spikes of 29psi on 9.3 CR cars without blowing it first  time.  
Chances are greater that you had a spark arc in the distributor,  similar to the 
3B motor.  Not sure about those injector sizes, at 300ATWHP  you shouldn't 
need more than a 33lb injector IME.  46 is too high, ck it  out by plugging in 
injectors into the RC injector calculator on line.
 
Stephen, I think you have a problem you haven't found yet.  Find out  what 
toasted your motor, or you will do it again.  
 
In the meantime, try to find a WX head to replace the one you have.  A  
5000turbo head past 1985 here in the states will NOT bolt onto the WX block  
without modifications to either the block or the head.  For more on this,  get both 
10vt gaskets (WX and MC), you will see what you need to do.  The  85 turbo 
head will give you hydraulic lfiters and allow you to use the WX head  gasket.
 
If going with the WX head with mech lifters, try to get a WR cam.  If  going 
with the MC head with hydraulic lifters, get the MC II (same as 10v N/A NF  
cam)
 
HTH and my .02
 
Scott Justusson
2.5 urq's
 
 
In a message dated 5/19/2007 12:56:54 P.M. Central Standard Time,  
shr42 at msn.com writes:

-----------  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


 



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