Duals Idea
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Originally Posted by greystreak92
JetBlack, Kem is right for two reasons... the one he already mentioned along with the fact that a crossover helps equalize the backpressure in the system when you have two exhaust pipes with slightly different bends and lengths that create different flow and backpressure patterns within the rest of the system, AND you can't run O2 sensors in parallel. They will "confuse" the EEC computer because they would BOTH be sending readings down the same wiring back to the computer. The EEC-IV computers only have a provision for ONE O2 sensor input.
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From: Gateway to the West
Yes, but not every EEC-IV setup was the same. The Bronco/F-series had only one sensor. Not to mention that a 3.8 computer will not work in place of a 5.0 or 5.8 computer. The software, and in some cases the physical connections, are completely different. Basically the computers are specific to the vehicle in question for the most part. The computer from an F150 with a 302 and an E4OD will swap into a Bronco with the same setup but the computer from a Mustang with a 302 and a different transmission won't.
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4. And last, has anyone tried the Gibson system on their Bronco?
Last edited by jesta302; Nov 2, 2005 at 06:14 PM. Reason: Quote tags
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From: West Virginia
Actually considering the fact that I have a 4 inch lift with 33x12.50x15s with 3.55 gears (although it's not a big lift/tire combo this is on a stock engine with 314k miles) and an E4OD tranny I get good gas mileage. I get anywhere from 9-13mpg around town and on my normal backroads drive to work (I have a REALLY heavy right foot 
, but when manage to find a way to keep my foot from finding it's way through the floorboard, I get about 12 to 13) I always turn overdrive off untill I hit a really open stretch of road to keep the tranny from going from gear to gear on these mountain roads. Most of my mileage comes from knowing my Bronco and the roads I'm driving on, I know how to take the hill and such, that saves on a lot of gas as I know when my Bronco likes to downshift. And about 14-16 on the highway when I take it on trips to buy equipment and go to family functions. I do have a custom air box, and a couple other little mods I've done to the engine, but nothing major like a cam, heads, or anything of that nature.
, but when manage to find a way to keep my foot from finding it's way through the floorboard, I get about 12 to 13) I always turn overdrive off untill I hit a really open stretch of road to keep the tranny from going from gear to gear on these mountain roads. Most of my mileage comes from knowing my Bronco and the roads I'm driving on, I know how to take the hill and such, that saves on a lot of gas as I know when my Bronco likes to downshift. And about 14-16 on the highway when I take it on trips to buy equipment and go to family functions. I do have a custom air box, and a couple other little mods I've done to the engine, but nothing major like a cam, heads, or anything of that nature.
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Originally Posted by Kemicalburns
a crossover is a must. it provides increase scavenging of the exhaust gases. it will improve performance.
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From: Destin/Ft. Walton Beach,
True duals work best for me on a Bronco, with both going down the passenger side. No bigger then 2 1/4", with an X or H pipe. All mandrel bent of course, with no mufflers. Only cats. Big tips on the exit is only for sound. No performance gains, there. This is the best of both worlds. If you want the most torque at the lowest RPM possible, go with what Kemical says. A well engineered 3" is best for low end torque. This is all true with only a stock engine.
Last edited by stevef100s; Nov 2, 2005 at 11:50 PM.
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Originally Posted by jesta302
Yes, I ran that system on my '95 Bronco, and generally liked it. But when I cranked up the HP with a new motor, that Gibson sound just was not enough. Cut it off and replaced with a single chamber Flowmaster. Nice now. Moral of story: Gibson = great quality, poor sound. Needs to be louder.
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Originally Posted by stevef100s
True duals work best for me on a Bronco, with both going down the passenger side. No bigger then 2 1/4", with an X or H pipe. All mandrel bent of course, with no mufflers. Only cats. Big tips on the exit is only for sound. No performance gains, there. This is the best of both worlds. If you want the most torque at the lowest RPM possible, go with what Kemical says. A well engineered 3" is best for low end torque. This is all true with only a stock engine.
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the o2 possition is in the right bank pipe not in the y pipe anyways, i dont understand that concept of needing the h or x pipe if its mainly located in the right bank, i like the dual 2" with cats and dynomax with 3" tips i think that there is the wickedest system of all and iff what yall is saying an h pipe in there too, as for looks of it id have all the pipes and stuf chromed
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From: Gateway to the West
Originally Posted by dixiebronco1986
the o2 possition is in the right bank pipe not in the y pipe anyways, i dont understand that concept of needing the h or x pipe if its mainly located in the right bank,
Not true. The O2 sensor is mounted at the convergence of the two arms of the Y-pipe. It HAS to be to get the correct readings for the entire engine. If yours has it in the right side of the Y-pipe then it was replaced and the O2 sensor mounted incorrectly. This is a fact. The ONLY F-series/Bronco that ever had an O2 sensor located up in the arms of the Y-pipe were the OBD-II equipped models that required THREE O2 sensors. Even these trucks had one sensor in each arm and one still down at the convergence of the pipes. This allows the ODB-II mass-air computers to monitor the left anf right banks of cylinders more accurately. The one in the base of the Y-pipe remained to keep an overall reading going back to the computer.
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