For power there are a couple of things that arent too expenseive that you can do. 2.5 inch exhaust, air intake, underdrive pulleys, and an electric fan. If you do the exhaust and the air intake people usually get a tune from James Henson and it really helps out then.
Yes to the 2.5" exhaust (what i've been saying the whole time)
for the intake, i'd recommend a k&n filter, but stay away from some of the after market intake systems.. many of them claim "cold air" but actually eliminate the stock cold air intake, and just have the filter exposed in the engine bay where it will suck up hot air. remember, stock intake systems ARE cold air.. and they're actually pretty damn good, just upgrade the filter to a free-er flowing one.
i'm not a big fan of underdrive pulleys... the reasons being (and i'll list the pros/cons for each accessory effected)
alternator:
pros: none. output amperage is electronically regulated, if you turn it slower, it takes more force to turn it, netting the same HP from the engine.
cons: won't charge as well at idle.
a/c:
pros: none. like the alternator, the a/c compressor will net the same hp from the engine if turned slower... it cycles on and off, and it's duty cycle (on time) will be increased if it's turned slower. no gain here (just turn a/c off if you want to race anyhow)
cons: won't cool very well at idle because a/c compressor is turning too slow
power steering:
pros: very, very slight gain (less than 1 horsepower) from less mechanical loss, from the bearings in the pump... but once again, it's pressure regulated, so if you're turning the steering, it'll just take more force to turn the pump than it would if it was turning faster (think old car, that squeals the belts while trying to steer while the engine is idling, but doesn't squeal while the engine is revved up) also, the p/s pump doesn't do much if you're driving straight (takes very little to spin)
cons: less power steering ability at idle. more likely to squeal the belts.632
water pump
pros: very slight savings from pumping the water slower. (maybe 1 horsepower)
cons: won't cool as well.
i think i covered it all... yes, i have a bias against underdrive pulleys, or anything that has negative effects and has its sales driven by marketing lies.
an electric fan may save a tiny bit of power, but keep in mind they don't move as much air, so cooling is reduced, and many of them attach to the radiator itself, which is a horrible idea and causes radiator leaks. if you get one, be sure it has a mounting bracket that does not involve attaching to the radiator core (with zip ties etc).
FWIW you're mechanical fan's clutch disengages when the engine is revved up, for the purpose of freeing up power (thats why you're fan doesnt roar when you rev the engine) fan's max speed is at about 2,000 rpm.
a tune is never a bad idea, especially if you've modified things (exhaust, air filter, etc)
hi all i have a 94 exploer with the 4.0 in it its 4x4 and has 31 x10.5 good year mtr on it and a throttle body spacer and a flowmaster exh wondering if any one could tell me if this chip....
84Horsepower Increase 7MPG Boost Easy Install + Money-Back Guarantee
www.GFChips.com
wood do any good or if its a load of bs.
bad idea. in general, chips are a bad idea for all pre-obdII cars (unless they are custom computers, made application specific for highly modified engines)
you have the same engine i have. it's a good engine, but not a high powered engine at only about 155 horsepower. if you want a little more pep, go with lower axle gears, this will help compensate for the (larger than stock) 31" tires. i think 4.56's would be a good all-around gear for you. lower axle ratios also improve trans life.
...although with the promises of that chip, it's damn tempting even though i know its lies! haha
Why stay away from Bosch, Id really like someone to explain this, I run them in my Ex and can honestly say I love how it runs. I've ran Motorcraft, NGK (BIG NO NO) and Bosch and Bosch seems to run the best.
