Topic: 4 Cylinder

[bbass]

My 2000 jeep wrangler is an automatic, 4 cylinder.  Is there any way to get more power out of my 4 cylinder?  Or is there any way to upgrade to a 6 or 8 cylinder?  Any help would be greatly appreciated.

[Jeffy]

Use the search.  It's been discussed recently.

[4x4grey88]

Change to 'cold air intake', add a 'throttle body spacer', add a ignition spark increase system,  and change out the clutch cooler fan with a electric cooler fan.

I have completed all these modifications and see a nice increase to power and milage of my 2001 Wrangler (2.5L).

Hope this helps.

Happy Jeepin :D

[Tall Boy]

4x4 grey,

 What kind of an ignition system did you get? I got an 2001 also.

[kenny kustom]

just today i put on a 4.0l TB, ford 19lb injectors, pulled out the airbox restrictors. The is a noticeable difference. I allready have electric fan.

I also run premium in my jeep. Allways have, and allways will. I know there is a difference.

[superman1456]

hate to say this but if your car dont call for high test then it dont need it. it wont help it will only hurt your mpg and your over all proformance of the truck high test takes longer to burn and does not burn as hot as regular does. so all your doin it wasting money and killing mpg. and its been pruvin. if you dont have the high cr then then engin dont need it. trust me on this one i used to beleave the same untill i did a test on the dyno and regular made more hp and better mpg on stock cr then high test did by almost 10hp. good luck and i hope you take the time to do it for yourself.

[chardrc]

thats cuz they program the computers to run on regular cuz everything else is too expensive... i run mid grade gas in my s10 and jeep after finding a gas station that has it the same price as regular and i found a noticable power increese..

[Tall Boy]

My manwell says 87 is preferred in ze Jeep here in California. I went out of state into Colorado and bought 85 octane and could not tell the difference in power. If so, it is too minute for me to tell a difference. I could however tell the price difference of $.30 :roll: .

[superman1456]

you need a real dyno. run both fules and then make your choice.

[Jeffy]

My manwell says 87 is preferred in ze Jeep here in California. I went out of state into Colorado and bought 85 octane and could not tell the difference in power. If so, it is too minute for me to tell a difference. I could however tell the price difference of $.30 :roll: .

That is different.  Because of the elevation of CO, you do not need the higher octane of 87.  85 is about the same as 87 at altitude.

I wouldn't run premium in a Jeep unless you've done major internal work or are running forced induction.  Otherwise, it's a waste of money.

[kenny kustom]

hate to say this but if your car dont call for high test then it dont need it. it wont help it will only hurt your mpg and your over all proformance of the truck high test takes longer to burn and does not burn as hot as regular does. so all your doin it wasting money and killing mpg. and its been pruvin. if you dont have the high cr then then engin dont need it. trust me on this one i used to beleave the same untill i did a test on the dyno and regular made more hp and better mpg on stock cr then high test did by almost 10hp. good luck and i hope you take the time to do it for yourself.

How the heck do you figure that premium can hurt mpg ? ? I have done my own tests and there is a difference. I burn it in my car, boat, sled, jeep. It doesnt take longer to burn. You can change temperature just by changing the plug.
I own a gas station. I know a thing or two about fuel.

[wrangler387]

Do you own a dyno? owning a gas station does not make you have any more say then any other person. 93 octane is pointless in a stock 2.5L, it does not provide better mpg or more power then 87 under the same conditions (AFR/timing/temps etc.). 93 octane is only worthwhile when your car detonates on the lower grades, if your car is doing this then you will see gains by switching over to 93. I plan to run 87 or 89 while my motor is on low boost.

[HIWYH8R]

Kenny your wrong. Check it out on a dyno. And yes, 93 does burn cooler and has a longer burn time. 93 does give you less MPG and power than 87 on any thing lower than 9:1 compression.  Unless you have a high compession engine,  cam and advanced timing, high octane gas is just wasting you money.

[Tall Boy]

Come to think of it, my auto instructor talked of new toyota celica's and supra's or whatever sports cars they have, use only high octane gas. Anything else fouls it out. Maybe it is their cam's and valves and stuff. He said that running anything not reccomended was futile. He did say to stay away from cheap gas because all the problems he has seen, like running rich or lean,  is a cause of cheap gas.

[Jeffy]

Come to think of it, my auto instructor talked of new toyota celica's and supra's or whatever sports cars they have, use only high octane gas. Anything else fouls it out. Maybe it is their cam's and valves and stuff. He said that running anything not reccomended was futile. He did say to stay away from cheap gas because all the problems he has seen, like running rich or lean,  is a cause of cheap gas.

The Celica GT4 and the Supra Turbo both need high octane gas to prevent premature detonation caused by the Turbo's.  Some Naturally Aspirated engines require high octane fuel also.  This is because they use a high compression ratio.  RSX Type S, Mini and Mini S are two that come to mind.

'Dirty' fuel can be a problem too.  It will cause predetonation under higher RPM's usually.  I've had problems running Shell 87 in my Jeep.  Engine pinged like crazy when going up any hills.