I've been wondering about this for some time now...
Number_Cruncher
Active Member
>>Would there not be a slightly different map for Cat and Non Cat equipped cars though?
Yes, there's far more room for taking advantage of larger excursions from stoichometric in non - cat cars.
For a brief period in the early 90's some Vauxhall (Bosch) ECUs could be coded to run open loop or closed loop by an earthed coding wire, and the ECU was the same part number for pre 1993 non-cat cars as it was for cat cars post 1993.
Yes, there's far more room for taking advantage of larger excursions from stoichometric in non - cat cars.
For a brief period in the early 90's some Vauxhall (Bosch) ECUs could be coded to run open loop or closed loop by an earthed coding wire, and the ECU was the same part number for pre 1993 non-cat cars as it was for cat cars post 1993.
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Dieselman
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You've been reading too much marketing material. We shall see when Uberwagon tests his but 3-5% is dreaming, that's as much as a complete exhaust change.
As far as the market being huge for mods, that is no indicatiopn of their additional performance, take remapping as an example of that.
As a test a quick run over a distance taking 10secs would be good enough. If there was a 5% improvement in output then the time would come down by 0.5secs. That's not going to happen by removing a Cat.
Not really - this has been discussed from day one on any car forum and it's a typical result.
Rather a lot of assumption going on there. Any increase in power would typically be seen at one point in the rev range and not across the board.
OT - Most people seem to get obsessed with peak figures and 'mine has more bhp than yours' when realistically only a torque and power curve will identify characteristics.
While i agree with this, dont you think that if a small spot in the rev range has been improved, it will show on a timed distance run? even if its a matter of fractions of a second?
