Hey guys,
How are you getting past the after cat monitor? From what I was told OBD II
systems 96 and newer use an aftercat monitor to check to make sure the
convert is doing it's job. I was told if you remove the cat the computer
gets lost..... Is this true?
Tim
Date: Wed, 23 Aug 2000 22:03:47 -0700 (PDT)
From: Sam Parthemer <rtdkota@yahoo.com>
Subject: Re: DML: What the F*@$%dkd@#$%$^%$!!!!!!!!!!!!!!!
Being that I am a novice when it comes to Dakotas, as I've
been told...
Gutting the cat is one reason you lost your low end.
Here's a little info on the R/T (and other 5.2/5.9L Magnum
powered vehicles).
The cam is setup for torque-- towing power (even though we
all know the story about the R/T and towing). Your torque
curve comes on around 1400 rpm and climbs steady up to
around 3800 where it starts to curve back down (and
steeper). You horsepower doesn't really start to build
until around 3500 rpm (150 or so at the wheels)... and
peaks around 4600 rpm. By 'gutting' the cat for
horsepower, you've killed your torque. I bet the truck is
a dog (to me at least) until about 2500 rpm, when it starts
to get going... Your power curve would fall into a small
window of about 2500-4600 rpm. That's only 2100 rpm worth.
If you had a high reving cam, then the horsepower window
would be much wider, as it most likely wouldn't be gear
towards torque. What to do? Well.. start from where you
did- headers. Shortie headers are great for torque, and
offer some increases in horsepower (JBAs w/ stock y pipes).
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