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Sedans Honda Accord Honda Accord Performance Modifications
330 messages, Last post on Apr 08, 2009 at 5:25 AM
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Replying to: elroy5 (Oct 13, 2007 6:42 pm)  The TSX uses the same 2.4L 4 cylinder mine does, albut in a higher state of tune, so the weight should be very similar in the front end.
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Replying to: lilengineerboy (Oct 14, 2007 4:15 am) |
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Replying to: elroy5 (Oct 13, 2007 6:42 pm)
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Replying to: oldmansi (Oct 14, 2007 9:59 am) I still think I am just leaving it stock for a year and then getting something more fun. |
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Replying to: lilengineerboy (Sep 11, 2007 6:15 am) Like I said:AEM makes a water bypass thing that supposedly keeps your motor from sucking up water. If it keeps the water out, then you will not get the air-flow benefits of a CAI. Also a lot of CAIs suck in hot air from the engine compartment, which basically any of the negligable gains you get from a CAI. Having too little back pressure IIRC can cause your exhaust valves to get burnt. I believe the back pressure is in the cats, which are legally mandated so I think you could use a sewer pipe for your exhaust and still have enough back pressure to prevent injury. A Walker, Borla or Dynomax are all considered stock exhaust replacements, your you could go with a Japanese aftermarket hot-rod type. That burning exhaust valves sounds like a turbo related issue also, I don't think NA cars can get that hot. Nope, not a Turbo issue as the turbo itself provides all the back pressure the engine needs, so anything downstream that lowers the backpressure won't lower it below the level that the turbo provides. As for the cat itself providing back pressure, that is true to a certain extent but then putting on something after a restrictive cat (one which would provide the proper back-pressure) is irrelivent in terms of flow because the bottleneck is still in the cat. Essentially on an NA car you will want a certain amount of back pressure in order to keep your low end torque. If you put a real big open exhaust on an NA car you'll loose a ton of low end power. If you are only doing a catback, it's mostly for the noise, not the power so it doesn't matter what you put on. -mike
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Replying to: paisan (Oct 14, 2007 8:33 pm) Air Bypass Valve for Cold Air PDF of flow rate report If it keeps the water out, then you will not get the air-flow benefits of a CAI. Doesn't seem to be the case. Also a lot of CAIs suck in hot air from the engine compartment, which basically any of the negligable gains you get from a CAI. If its sucking hot air from the engine compartment, its not a cold air intake. CAIs only work when the car is moving though. Nope, not a Turbo issue as the turbo itself provides all the back pressure the engine needs, so anything downstream that lowers the backpressure won't lower it below the level that the turbo provides. I agree that the Turbo is the biggest bottleneck, but bing self sufficient for back pressure was not so much so in the case of RX7s and Supras. As for the cat itself providing back pressure, that is true to a certain extent but then putting on something after a restrictive cat (one which would provide the proper back-pressure) is irrelevant in terms of flow because the bottleneck is still in the cat. I concur; that is my point.
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Replying to: lilengineerboy (Oct 15, 2007 5:09 am) Today's cars are designed pretty well, and gains from intake and exhaust modifications are minimal (not worth the cost).
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Replying to: elroy5 (Oct 15, 2007 1:32 pm) That is what I was getting at.  -mike
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Replying to: lilengineerboy (Oct 15, 2007 5:09 am) If its sucking hot air from the engine compartment, its not a cold air intake. CAIs only work when the car is moving though. Yes but a lot of CAIs suck in hot air from the engine compartment, essentially the cold air comes through the radiator, gets nice and HOT and then is sucked in through the foam filter in the engine compartment. This allows more flow, due to being less restrictive, but negates the greater flow by sucking in hotter than normal air. -mike |
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Replying to: paisan (Oct 15, 2007 5:10 pm) 
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