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Unread 03-01-2002, 08:59 PM   #1
jeepcherokeev6
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lack of power in 2.8

ok, ive had this jeep for a while, and i would like more from it!

heres the deal: im 17, i know my way around cars (especially mine), and i want more than the 2.8 offers. the jeep is a 86 xj, manual trans, with the 2.8. it runs great, no problems, but the 2.8 isnt the most desireable engine in jeeps. how can i get more power, and still stick with this engine? ive been thinking about converting to fuel injection, like the kind that is in the fiero, pontiac 6000, or camaro ...would these FI parts be interchangeable? what other modification would there be?

i wouldnt do this any time soon, but im just curious for now...any help appreciated!

-Dan, Southern California

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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-05-2002, 06:25 AM   #2
jeepcherokeev6
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come on! no one wants to help me out?!?!
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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-05-2002, 02:14 PM   #3
NC74CJ
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hey im your huckleberry

you want tuned port injection on your 2.8? i wouldnt even think about it. several reasons - 1) finding (making) an intake manifold and the rest of parts needed from throttle body to sensors to your wiring harness
2) you would have to map out your own fuel settings etc
3) a properly set up carbeuretor will run just as good as any fuel injection

even is you spent 5 thousand dollars on this you probably wouldnt notice a difference between the injection and carb except during cold starts.

its a small motor, and it doesnt make much power. if you are heartset on injection, consider throttle body. Its cheap, abundant, and would be alot easier to convert to.

If you want more speed then consider doing smaller things. Rebuild your carb, basic tuneup stuff, better exhaust, maybe pull the heads and intake off and port them a little. Then take weight off your vehicle. That is the easiest way to get better performance. Do you really use your backseat? How about your AC? Ditching your AC will gain you a couple horsepower. Try to take only the tools you need. And if you have new rubber and are confident with it (and the roads) then leave the spare at home. Probably the biggest improvement would could make would be in your gear ratios. Get someone to install some deeper gears. Sure it will kill your gas milage, but I gaurantee you it will cost less than converting the TPI from a 5.7 liter Camaro to a 2.8 liter Jeep. Good Luck

Bill
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Unread 03-05-2002, 03:41 PM   #4
jeepcherokeev6
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1) im not heart set on tpi, that was just a thought
2) im not talking about the 5.7 camaro, i mean the 2.8 one (and yes, they did put my little engine in camaros) but your right, i would have to set up the sensors to my wiring harness, etc. so it may not be worth it, as you said.
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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-06-2002, 01:40 PM   #5
NeillBarber
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Get the performer packege from Edelbrock. I am extremely happy with mine. Or you could get the 3.4L stroker kit if you are doing a complete rebuild.


NeillBArber
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Unread 03-06-2002, 04:03 PM   #6
jeepcherokeev6
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neil,
where did u get your edelbrock package? if ido anything like that, it wont be until a rebuild, but im just curious for now.

also, 3.4 stroker kit? whats included in that and whats a stroker?
sorry for sounding a little wierd to u, but i dont have much experience with engine performance.

thanx
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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-07-2002, 08:52 PM   #7
NeillBarber
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I orderes the performer package from summit and CLICK HERE for the stroker kit.


Neill
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Unread 03-08-2002, 01:11 AM   #8
jeepcherokeev6
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thanx alot, niel, ill look into it
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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-23-2002, 02:08 AM   #9
CHVYPWR
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Quote:
Originally posted by NC74CJ:
hey im your huckleberry

you want tuned port injection on your 2.8? i wouldnt even think about it. several reasons - 1) finding (making) an intake manifold and the rest of parts needed from throttle body to sensors to your wiring harness
2) you would have to map out your own fuel settings etc
3) a properly set up carbeuretor will run just as good as any fuel injection

even is you spent 5 thousand dollars on this you probably wouldnt notice a difference between the injection and carb except during cold starts.

its a small motor, and it doesnt make much power. if you are heartset on injection, consider throttle body. Its cheap, abundant, and would be alot easier to convert to.

If you want more speed then consider doing smaller things. Rebuild your carb, basic tuneup stuff, better exhaust, maybe pull the heads and intake off and port them a little. Then take weight off your vehicle. That is the easiest way to get better performance. Do you really use your backseat? How about your AC? Ditching your AC will gain you a couple horsepower. Try to take only the tools you need. And if you have new rubber and are confident with it (and the roads) then leave the spare at home. Probably the biggest improvement would could make would be in your gear ratios. Get someone to install some deeper gears. Sure it will kill your gas milage, but I gaurantee you it will cost less than converting the TPI from a 5.7 liter Camaro to a 2.8 liter Jeep. Good Luck

Bill
I think you may be mis-understanding what he's asking. He's talking about using the Multi-point fuel injection 2.8, not a throttle body 5.7.
I've looked into this for my 2.8 powered XJ. The MPFI 2.8 is a grand inprovement over the carbed unit. It has a more aggressive cam, larger intake valves, and more compression. It can only be a Camaro/Firebird 2.8 though, the front drive models have the starter on the opposite side of the block, different accessory holes drilled in the heads, and a different intake design. If someone was to get a complete F-body doner it would be a fun, and rewarding project.
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Unread 03-23-2002, 11:04 AM   #10
Bulletproofcj7
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I have an '88 chevy beretta that has the MPFI 2.8L (multi PORT fuel injection) its a great engine pretty torquey too. had 211658 miles on it before i had to replace the motor, and that was my own fault.
It works great in the car, excelent throttle response easy starting, fast and good on gas, but that is in a light car with a five speed not a heavy xj.
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Unread 03-24-2002, 10:07 PM   #11
jeepcherokeev6
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ok, i see what you're saying, 86wgnr, and bulletproofcj7.

would you recommend mpfi, or maybe a TBI?
also, forgive me for being a complete newbie, but whats the difference?

thanx, guys
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'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
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Unread 03-24-2002, 11:20 PM   #12
CHVYPWR
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by jeepcherokeev6:
<strong>
would you recommend mpfi, or maybe a TBI?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Definantly go with the MPFI! More HP and torque!
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Unread 03-26-2002, 12:01 PM   #13
Mr. Mopar
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the engine from the camario, or the fire bird will work. it must be a RWD car because the starter mount is on the other side in a FWD car. i think the camario and fire bird are the only RWD cars with a 2.8 but i could be wrong. your best bet is to go to a bone yard and drag the whole car home, but not with your little 2.8 the MPFI engine is better because
larger valves
better cam
and MPFI
the reason i say get the car it so you can make sure you get everything. as far as i know you will need the engine, the computer, the harnes, mabey the engine mounts. but if you have the whole car then you got everything.
also with that engine you should be able to get a chip and get some more horse, also a good intake can make a difference, also having a V engine you can run duel exst.
hope it works out
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Unread 03-27-2002, 11:09 AM   #14
4wheeler4CJ
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I agree with taking entire car home, vs. trying to get all the parts out in the boneyard. It'll give you time at home to sort through it all to do it at home "comfortably", LOL.

However, just to add a side-note, you can run "True" dual exhaust on any Inline Motor, you don't need a V-Motor to have true duals. Dual Exhaust Manifolds (True Duals, not single to Dual) are available even for 4-Cyl. Inlines. Check out Clifford Performance, he specializes in Inline Race/Performance applications, it's amazing what he has available! Stuff you would never believe, LOL! <img border="0" title="" alt="[Eek!]" src="eek.gif" />
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