Re: [DML] Cat removal
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Re: [DML] Cat removal

First off, The legal ramifications are something that needs to be  
noted, especially on a public forum.  Second, for those that are  
willing to look into the possibilities, modifications like this and  

A Test pipe would be perfectly legal to use if your vehicle is going  
to be on a closed course such as a race track.  Honestly, How many of  
us are really going to use our cars for "Track Use Only"  I  
personally have another vehicle that is for the track and my Delorean  
sits in my Driveway waiting for me to do more repairs to it.  I have  
this Delorean since 92 after my first one got wrecked.  It came with  
a single turbo and NO CAT or Muffler.  The car was unbearably load  
for street use, but the performance was much better.  Adding a the  
cat greatly reduced performance, but since I live in California and  
the car is driven on the street, it was necessary to install a cat to  
keep everyone happy.  My car passes smog every-time with no issues.

Now, that being said, when you increase the flow going out of the  
engine you have to consider the need to increase the flow going into  
the engine.  To get a better feel for how much improvement you will  
get by freeing up your exhaust system is going to be inhibited by the  
intake and fuel systems ability to keep up with the rest of the  
motor.  Opening up the intake system is not that involved, and can be  
done fairly easy if you know what you are doing.  Now lets consider  
the fuel system.  With more air going into the motor, and more air  
going out of the motor, the stock computer with the lambda sensor can  
calculate the proper amount of fuel needed, but the fuel system will  
not be able to keep up with much more than the stock power the motor  
can produce.  If you really want to make more power from the PRV  
motor, you might want to consider upgrades to the stock fuel system.

Anything is possible with the right people fabricating parts, lots of  
money and the ability to replace all the parts that might be broken  
or blown up by bad fuel maps.  Just remember that the car was  
originally tuned to run a specific way with the equipment that is on  
it.  Minor modifications to the motor might make small improvements,  
but to utilize the true performance potentials, you have to look at  
many different systems.

I hope this helps in your ventures for a better running car.


On Sep 21, 2005, at 10:45 AM, denverdelorean wrote:

> This is a valid point, Legal ramifications should be discussed.
> However.  It is well known that romving a converter is illegal.  It
> seems to be so well known that it is the first thing people will say
> when the procedure is mentioned.  I posted earlier about how other
> things we do are just as illegal, but not as well publicised, so they
> do not even get a mention where legality is concerned.  My original
> question regarding removal of the cat was not intended to spark a
> purely legal debate, but a mechanical one.  Thus far, I have recieved
> only one mechanical reply.
> And here I thought De Lorean owners where the type to live just a
> little bit against the grain.  I guess I am largely on my own on this
> one.  I'll let you guys know what jail is like if they let me post
> from the "Inside"
> Matt
> still legal in Colorado
> #16076
> --- In dmcnews@xxxxxxxxxxxxxxx, mike.griese@xxxx wrote:
>> I respectfully disagree in this case.  If we were discussing any
> other
>> performance improvement, it would be prudent to cover all of
>> the potential downsides of the modification - increased HP at
>> a reduced reliability, for example, or increased tire wear due
>> to a suspension change.  This allows the owner to weigh the risk
>> of the improvement against the downsides.  Legal ramifications are
>> also risks and should be discussed.
>> --
>> Mike

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