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Re: cat in good condition gives almost no backpressure (nm) Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Sun, 5 Feb 2012 09:49:53 In Reply to: Re: cat in good condition gives almost no backpressure (nm), Simon, Sun, 5 Feb 2012 09:14:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I might be picking the wrong nits, but if dumping the cat nets 10hp, then how is it no c900 ever came with more than 185hp? Shouldn't the last of them have had 195hp? Why is it LH and APC boxes were market and engine specific?
Additionally, having dyno'd my '90 SPG with cat and with test pipe I can't corroborate your statements. Baseline with cat and some minor mods (but stock 10 year old cat at the time on a stock exhaust) was 198hp. With test pipe? 204hp. I netted six additional horsepower at significantly higher flow levels than stock. I find it virtually impossible to believe removing a healthy cat from a bone-stock 900 will yield a free 10hp.
Virtually no modern turbo car tuner (and I'm talking about Vishnu, APR, etc.) requires a cat delete until you are heading beyond 400hp. At that point, the one or two percentage points that cats cost you amount to tangible numbers. On a 160hp the 1 or 2% a cat really costs you is 3-4hp, max.
And, finally, even were I to give in on this note it must be pointed out that this free 10hp is at very close to redline. Unless you make a point of driving around a 5500rpm all day, the real-world (that is, 3000rpm) improvement to your output for not having a cat is going to be 1 or 2hp at most. That is a ridiculous improvement to make in exchange for dumping unmoderated pollutants into our atmosphere. That is a shameful exchange IMHO.
posted by 69.62.18...
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