Special feature is it’s an easy swap-out for a De-Cat pipe or a Silenced De-Cat.
This should be a much cheaper solution plus you don’t have to disturb the whole exhaust system to fit them.
The cat comes with special heat-wrap. It’s been through Track Days and Dyno runs on Uldis’s S1 and it’s still pristine - very impressive stuff. This means the ugly heat shielding can be binned
This particular one is a high flow item rated to 375hp!
Looks good. Is the pipe between the header and the cat divided in two like the stock one, retaining the 4-2-1 is setup?
No no - I did think about it though. The divider’s main purpose is to do with emissions. I read about it years ago. It heats up rapidly and helps the Cat “light-off” at engine start (when emissions are high). Yes, it makes the manifold set-up mimic a 4-2-1 but it actually costs power - a Lotus engineer admitted that to me. Jamie is planning a Supercharger installation, that divider would not help gas flow at all.
The first sensor(nearest engine) is the Lambda, the second measures the performance of the Cat. Now I’ve been told it(the second one) must sense an increase/difference in exhaust gas temperature - or the MIL light comes on. Hence the bare de-cat pipes always bring the MIL light on (on a 2-sensor system). MIL eliminator kits seem to work.
yeah its for two o2 sensors, the second one determines if the cat is working properly and the changes by the ecu are taking effect.
so far i don’t know anyone whos gotten a MIL eliminator working properly yet, we’re working on one at the moment though .
the cheap resistor ones definetely don’t work, the 555 pulse timer ones also may not work, the have to match the waveform closely
Charlie, have you tried this idea of spacing the sensors out of the gas flow? I’ve seen it on some Jap engine sites. I’d like to pull the first sensor back from the gas flow a bit and keep the second sensor fully engaged, there would be a difference in temp - but enough?
tried the stand off by moving the o2 further out with a spaceer, resistor mod (which is useless on anything after OBD I ) , and now the 555 timers mods.
i haven’t actually sampled my exiges O2 sensor yet with the scope, so we tried a toyota generic, results should be tomorrow.
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