Off Roading Forums banner
1 - 15 of 15 Posts
G

·
Discussion Starter · #1 ·
By putting in an electric fan, a new ignition system (Accel 300 ) and a K&N air filter will I see an increase in power? I know it will not be the 4.0L but if it would be noticable I will do it. All the parts I can get from Quadratec for about $500 and I can do it myself so that would also be the final cost. Is it worth it or should I not waste my time and money. I almost never go above 3000 RPM if that answers any questions so I am looking at the low range for power. Thanks for any input.

 
G

·
Discussion Starter · #2 ·
The K&N makes the biggest difference at high rpm (above 3000). I have never heard that the accel ignition system is worth it. A fan will help some but not much. Your best bet would be to go to www. turbocity.com (remove the space) and look under the Jeep power section. For the 500 you had mentioned you can get a lot more.

Nick Hagen
1995 Wrangler
33" Mud Tires and a four banger
 
G

·
Discussion Starter · #3 ·
I looked and saw the Power Kit Stages 1,2 and 3. Is this what you are talking about and do you use any of it? If so, did you see a noticable gain? Thanks.

 
G

·
Discussion Starter · #4 ·
yeah, the stage 1, 2, and 3 kits are what I was talking about. I haven't bought them yet because I have very little money (poor college kid). I've heard that they make a difference but can't personally confirm it. Short of a supercharger, it is had to get much of a performance gain out of a 4 banger. Of course, every little bit helps.

Nick Hagen
1995 Wrangler
33" Mud Tires and a four banger
 

·
Registered
Joined
·
2,062 Posts
The one thing that you can all be assured of: if it has the CARB sticker on it ..........it is going to do virtually nothing for you. Borla's own dyno test show that their CAT back system ......doesn't produce any added power til over 5000rpm........does anyone frequent those light speeds? Oh....it'll sound nice.......and if you have an older motor (not your 4 banger) throwing on a 4.0 head with the injection and such (HEI etc.) will 'bring you up to speed" and show remarkable improvements over older hardware ..... but for the contempory crowd .......virtually anything that really adds any punch .......will increase the emissions .....hence it will not have the CARB sticker on it. This is why I feel that most of the stuff we see for "engine enhancements" fattens the wallets of the vendors more than it broadens our power bands. You'll note that although the TC site mentions x-xx hp gains......it doesn't show WHERE that power kicks in.......more than likely its in a rpm range that you'll rarely see. I bought the TC rock-it tube to reclaim the air box space.....that's it. If it makes commuting 70+ miles a day a little more economical /wwwthreads_images/icons/laugh.gif.(ya....ya..buy a geo metro)/wwwthreads_images/icons/laugh.gif.....so be it.

Throw a set of 4.88's in....then you may actually attain the rpm ranges where these products provide their added juice....that should give you all the pull you need and you're still under 3000rpms at 70mph with a set of 33" tires.
GeeAea
 
G

·
Discussion Starter · #6 ·
I have a 93YJ 2.5L and have noticed fairly noticable power increases in the 2000-3000rpm range by making the following modifications. Instead of the Turbocity rocket tube, I bought Rusty's Off-Roads version--a lot cheaper (www.rustysoffroad.com). Order the larger K&N to go with it. This gives your engine more air than it could ever hope to use. I also got the TFX cat-back system from Quadratec (great service from them!). This system is very solid (the muffler is as thick as most skid plates!) and sounds great, but is not obnoxious. These two items provided a true increase in usable power and for a total cost of about $220 are a bargain if you ask me. Because of the extra power (or me just pushing it harder) my jeep was starting to run a bit hot, especially on inclines, so I looked into Turbocity's ported thermostat housing--no luck, it is only made for the 4.0. I did by the high flow 160 deg. thermostat and took a Dremel to the housing to improve flow through it. It is fairly obvious where it is restricted, but be careful of the thinner areas of the housing walls. Now, even off road my temp gauge is pegged at 160 degrees. Good luck!
 
G

·
Discussion Starter · #7 ·
Thanks for all the information. It doesn't sound like there is a clear-cut piece of equipment that is going to make any real difference. I will just look for a 4.0L roll-over that is trashed but has good engine, tranny and transfer case to switch out. Thanks again.

 

·
Registered
Joined
·
2,062 Posts
Nahhhhhh ......stay with the 4 banger........be a rebel! Slap in a set of 4.88's and crawl with the best of them....anyone can put a 6 or an 8 under the hood ......and presto chango......instant hp! ........but get there in a 4 banger.....and you've accomplished something. So what if you can't piss upwind in a class 5 hurricane when it comes the hp contest?
Let me correct myself .......the Paxton blower......carries the CARB cert. on it. It will give you an honest 40-50% power boost. At about $2-3000..it's a costly alternative to virtually any other powerplant option.

GeeAea
BTW-where do you live...it you're in a more "liberal" (darn.....now Dave is going to get started again .....I said the "L" word/wwwthreads_images/icons/smile.gif) emissions state ..there are alternatives.....your profile is empty.
 
G

·
Discussion Starter · #9 ·
are 4.88s available yet?

also, for the catback exhaust- Gibson, TFX, or Borla? Should I get the headers too?

 
G

·
Discussion Starter · #10 ·
4.88's are not available for the dana 35 yet. They have been advertisig for a while but they are not available. Weak pinion gear anyway.


 
G

·
Discussion Starter · #11 ·
Are you currently running the 4cyl or do you have the 6? If it is the 4, did you do anything to it? The only thing I have done so far is to pull out the reducer pipe from the air box to the throttle body, I noticed a smother idle. Thanks.

 
G

·
Discussion Starter · #12 ·
I gotta side with GeeAea on this stick with your 4 banger thing. I figure that Jeeps were made to go anywhere, just not fast. As for the 4.88, I heard that the reverse D30 also won't be available for a while either. That's a shame, because I'm planning a Ford 8.8 swap but am waiting for the gears. If they drag their heels for much longer I may swap in a TJ D30 (not a reverse cut) since 4.88 are already available for them ( so I'm told ).
As for increased power, what about Turbo City's bored throttle body? Has anyone used one of these? Any noticable increase?

_____________________
John
95.5 YJ with "stuff"
http://SonsofThunder4x4.com
 
G

·
Discussion Starter · #13 ·
I am not looking to go 70mph everywhere I go. Really I am looking for that little bit of extra power for the acceleration around turns or going up hills. Not much, just that little bit that the stock 4 doesn't seem to have. Other than that I have had no problems with the 4. I can go down the highway or around town with everyone else. Thanks again with all the input.

 

·
Registered
Joined
·
2,062 Posts
FNG-I followed a link (I don't have it anymore) to a guy's page who installed the TC bored out throttle body on a 4.0...he said that it "whistled"......and that TC instructed him to "gouge" the horn near the manifold........they said that the more of a "rough gouge" the less the "whistle" has a chance to form (I guess you're giving it chapped lips /wwwthreads_images/icons/smile.gif)....this equated to "the more of a butcher job you do on it ....the better.
Again the TC airhorn mod is an air related improvement. That is, it gives the engine breathing capacity beyond the design specs....as does the Borla headers and cat backs. What I believe (that is, my opinion) is that ..since all the fuel adjustments are computer controlled and compensate for air flow (MAP manifold absolute pressure sensor and MAS mass airflow sensor)that the only time you'll see any improvement or power enhancement is when you're at such a high rpm that you exceed the manufacturers intake/exhaust design flow ........that is, there is still "reserve" capacity for computer compensated fuel delivery... IF you have the added air flow............which means.......the stratosphere of the rpm range. This is what makes me doubt the real usefulness of such costly improvements......hence my critical skepicism of them. Just like when my old high school pal put an Offenhauser 4 bbl manifold and a Holley carb on his Plymouth slant 6 .........without a cam change it was just a fancy looking slant 6 ..........he couldn't get anything out of the added set of lungs.........with the stock cam it could only draw so much air/fuel.
Now a super/turbocharger ......that's a different story.......it, without regard to the intake capacity/valve size/combustion chamber shape-size/exhaust restrictions/camshaft grind, is going to cram more combustable intake charge into the system. You're kinda "reindexing" the engine .......that is, you're manipulating it to have an intake charge of a higher rpm at a lower rpm. Not that improving those other things would'nt help.......but since we can't do ALL those things (mainly the cam grind) and maintain our states "seal of environmental approval".....we're pretty well stuck with what the factory gives us..............or spend the $3000. I don't think that is too much to spend if it gives you what you want. I find it curious that most of the Jeep owners will be downright radically ingenious at figuring out how to get 2mm more clearance on their rigs ......but go the simple route when it comes to power (mainly, to quote dorfs, "there's no replacement for displacement" or throw in a V8).....again....I seek the untread path.
I'm, of course, open to altenate schools of thought on headers and such... but for right now......the weight of the evidence that I've seen (mainly the LACK of real world dyno tests) leaves me with little to put faith in.....and more importantly my money.

GeeAea
 
G

·
Discussion Starter · #15 ·
GeeAea- I gotta agree with you here. There's only so much bolt on goodies that you'll be able to add that will make a difference. Heck, if you added every item available to your engine you couldn't get 100 hp. I personally bought my 4 banger for the gears and figured I'd drop in a bigger mill once the warranty ran out. Now I'm keeping the 4 banger and am looking for deeper gears (4.88's and 32" tires).
There's a guy in my club who added a Rimmer supercharger to his 4 banger recently. He now scoots down the freeway much faster. Personally I'd rather put that $3K or more into the rest of the Jeep, but it's still more functional for him since he's only got 20K miles on his 94 (not a daily driver).

_____________________
John
95.5 YJ with "stuff"
http://SonsofThunder4x4.com
 
1 - 15 of 15 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top