Don't cull me please, no rotary atm (been about 6 years since I sold) but hope to be back one day and I still log on to lurk and drool
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Show posts MenuQuote from: Ricco_04If by having different lengths and diameter\'s of exhaust you can tune an engine, why then do drag cars/bikes use large diameters with virtually no length to them?Just a guess but drag cars/bikes have virtually no noise regulations either :Gigglemost exhausts are a compromise. Not forgetting that exhaust manufacturers also "tune" their exhausts to make a nice noise
would be sooo much cheaper if I could get them to quote me on classic ins
Quote from: SpeedworksJust very simple...Hot air is dense so when it exits the exhaust manifold itw ill need to pas throught the exhaust pipe. Which is, due to its size, a restriction.Nice post :Thumbs-up however hot air is not as dense as cold air, just thought that should be corrected
Quote from: rmagictasticit differs from car to car, but generally speaking if you get a good filter and dump the cat/bigger back box, you will suffer from boost spike whereby the gasses flow faster than the control loop on the stock ecu can catch it and dump excess pressure (via wastegate).boost spike?? or just increased boost? :confused::eek I\'m going to decat, better filter, new smic & remap my car, but I had thought that it would be ok to not fit a boost controller - or is this in fact necessary?
And as we know more boost needs more fuel, or in the case of the stock ecu, you will get \'Fuel Cut\', this feels like youve hit a brick wall, no power for a second then it goes back to normal.
Open your wallet get an Apexi PFC, have a map, and happy driving with more power, less fuel etc.....
Rmaj
Quote from: TimmyIt can cause boost spikes. But is your car a uk spec? as the title of the thread suggests as they have 2 cats.So do the jap imports only have 1 (the main cat) then? If so then is there any point in replacing the downpipe on imports?