I have a question reguarding headers for my jeep. I have an 83 CJ7 with 258 engine. So far all I have done is put in a K&N air filter in it. I would like to increase the horse power and was thinking of adding some headers. i was told headers will not make much of a diffrece. Is this true and does anyone have a better suggestion on how to add some power to my jeep. Thanks for any help that comes my way!!!
George
jcl64213 did pass the time by typing:
Depends on your budget. Headers with a cat-back will free up some lower end torque. Next is stroking or supercharging, but with your engines age I would not recommend a supercharger. An electric fan in place of the mechanical one will also free up a few ponies.
Doug, How does an electric fan free up ponies? Does it cause a drag/resistance on the system?
Bill
Do you have to pass emissions and how good are you at tuning up a carb?
If you are good with a carb, the computer can be put to sleep which gives you a sweet 25% 'seat of the pants' power boost. It will allow the engine to rev up to 4500 now as well, so you get a mph increase in each gear.
The engines can be tuned to pass emissions with really low numbers with out the computer messing with things. (there are some 'mechanics' here that always argue that because they never learned the carb skill, if it has no computer, they are lost I think. ;-) But we have the papers to prove it so...)
I am still just running the stock carb and exhaust manifold with a 2" straight pipe back to a Dynomax super turbo muffler with the hot Accel coil in her. I am not required to have a 'cat' on my 'utility' vehicle.
I get 11L/100 km or 23 mpg running 91 octane and it will pull fast in second up to 50 mph at 4400 rpm, 80+ mph in 3rd, bury the spedo in 4th and no freaking way do I want to find out how fast 5th goes. LOL!
It will spin tires starting off too easy and will climb sand pit or ravine walls pulling nice at 400 or so rpm without a stumble.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT'sjcl64213 wrote:
William Oliveri did pass the time by typing:
Basically it transfers load from the engines belt system to the battery system so rather than having to spin a fan all the time your engine can send more power to the wheels. An added benefit is you can turn the electric fan off when fording streams. Get too deep and a belt driven fan can hit water and be forced into the radiator. (of course that is quite deep)
Even with a mechanical clutch the fan is still taking power. An electric fan doesn't run if the cooling system doesn't need it.
It isn't all 'free' HP....
The extra load on the alternator does eat a few HP also. So you trade off alternator and battery life for the fan.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT'sDougW wrote:
I appreciate everyone's input!! It seams I have lots to learn. I'm starting with a HEI from e-bay for $165. Then maybe have someone good bypass my computer and tune up the carb. I like the idea of have
25% more power.George: do the John Nutter bypass on the computer>
It is really quick and easy to bypass the computer. All you have to do is add 2 new wires and hook the orange and purple wires from the ignition module directly to the orange and purple at the distributor.
The HEI will also cut out the computer by default.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT'sjcl64213 wrote:
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