Keram Posted November 2, 2004 Share Posted November 2, 2004 Hi, I am new owner of 2000 RX300, now I see why people pay the big $$$... Well, I would like to get more out of the engine... I am looking for help in finding bigger Throttle Bodie, and cold air intake. I can't find the T.Bodie... I found the Wheapon-R , and injen intake system. Any recomendation, where to buy it.??? I need advice on Cat-Back Ehst. sytem... I've read some people geting around 90HP extra, after modifications.... True ? Any guidance, would be apreciated.... Thanks, Mark Quote Link to comment Share on other sites More sharing options...
wwest Posted November 3, 2004 Share Posted November 3, 2004 False....!! The factory air filter is typically about 93% efficient, meaning at WOT and maximum RPM the engine would suck 7% more air if the input were NOT filtered at all. 7%, keep that in mind. The aftermarket filter marketeers, K&N, etc, tell us that their filter is up to 200% more efficient than the OEM product. Basically that means a gain of 3% additional airflow, but ONLY at WOT and max RPM. A 3% gain for a base 300HP engine is a net of 10HP for a total of 310HP. Your best bet IMMHO is to find someone to modify your intake system so that with WOT the engine computer "thinks" the incoming airflow is COLDER, more dense, that it actually is. Within the intake there is a thermistor, basically a resistor that changes resistance with temperature, that "tells" the engine computer the temperature/density of the incoming airstream. The computer tries to maintain the proper fuel/air mixture ratio and the above would result in a slightly greater level of fuel in the mixture and thus improved HP. The modification should only be enabled at WOT to prevent the ecu from "learning", during non-WOT operations, to correct the mixture via the downstream oxygen sensor. Quote Link to comment Share on other sites More sharing options...
ColinBarber Posted November 3, 2004 Share Posted November 3, 2004 You will probably find that at WOT the engine already runs rich. That is the norm with Toyota engines. Get a fuel computer and set up on a rolling road and you can reduce the fueling to get a slight increase in HP and a decrease in mpg. Quote Link to comment Share on other sites More sharing options...
TunedRX300 Posted November 3, 2004 Share Posted November 3, 2004 I doubt anyone can add 90 hp on a naturally aspired 220 hp engine. Ebay has 5Zigen Exhaust. http://cgi.ebay.com/ebaymotors/ws/eBayISAP...sspagename=WD1V Quote Link to comment Share on other sites More sharing options...
SKperformance Posted November 4, 2004 Share Posted November 4, 2004 A good cold air intake on a 1mz-fe like mine makes about 7 horsepower to a total of 15 with the exhaust to the wheels. I now make almost as much as a supercharged camry(which could be tuned better) No one else has made anythign better ,i find anything Injen makes is garbage. No R and D it just fits so they sell it. Quote Link to comment Share on other sites More sharing options...
strmrdr23 Posted November 6, 2004 Share Posted November 6, 2004 i don't think i've ever seen a cat back exhaust for the rx...only b-backs...i'm running a sheep dog exhaust personally Quote Link to comment Share on other sites More sharing options...
SKperformance Posted November 6, 2004 Share Posted November 6, 2004 B back ? never heard of that? I only chaneg the piping from the resonator back as it was inferior to the front section which was also oem . Quote Link to comment Share on other sites More sharing options...
TunedRX300 Posted December 6, 2004 Share Posted December 6, 2004 i don't think i've ever seen a cat back exhaust for the rx...only b-backs...i'm running a sheep dog exhaust personally ← Do you mean axleback? The link I posted is a cat-back. OptionImport carries a 5 Zigen header http://optionimports.com/import-store/fjt-014.html Also anyone install these? I would like to know if it is a bolt-on. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted December 6, 2004 Share Posted December 6, 2004 5-Zigen Jeff Fire 5Zigen Lexus Rx300 / Mcu15W 98-02 MSRP: $430.00 Our price: $365.50 that can;t be right for a header it has way too many bends to be that cheap it has to be an axle back exhaust if anything Quote Link to comment Share on other sites More sharing options...
TunedRX300 Posted December 6, 2004 Share Posted December 6, 2004 5-Zigen Jeff Fire 5Zigen Lexus Rx300 / Mcu15W 98-02MSRP: $430.00 Our price: $365.50 that can;t be right for a header it has way too many bends to be that cheap it has to be an axle back exhaust if anything ← I called the shop and got confirmation that it is a header but did not believe him either. I bet it is a typo. Quote Link to comment Share on other sites More sharing options...
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