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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 Sat, 4 Feb 2012 23:08:01 In Reply to: Re: cat in good condition gives almost no backpressure (nm), Simon S, Sat, 4 Feb 2012 22:00:40 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The Aero does not necessarily equal the SPG, and the Aero was not the same in all markets. Just because a cat-less Aero had +10hp over a given SPG is pretty meaningless as far as the cat goes.
Cars without cats ran open loop, with no O2 sensor. That meant they were free to run leaded gas, more peak boost or less taper, and richer mixtures without fear of ruining the cat. As a result, earlier Aeros offered higher peak output than our SPGs. It wasn't a function of the cat, it was fuel injection and APC tuning. Take a cruise through EPC and notice that LH ECUs (and the Lucas CU boxes) and APC boxes were market-specific.
185hp was the highest output offered on the c900 in any market - we got it through the "APC Tuning Kit" on '90+ Saabs and it was factory on CEs and (IIRC) '94 convertibles. Foreign market cat-less cars never got 195hp cars. They all made, at most, 185hp, and it was purely a function of the tuning.
A cat does indeed cut horsepower, but a ~2.4" ID cat on a ~160hp motor (that is, stock) is not a roadblock to making power. 0eleting the cat might gain a couple ponies, but I would be shocked if it was 5hp on a healthy cat.
posted by 69.62.18...
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