|10-04-2012 10:06 PM|
|Xpress||Would be around 3200rpm with the 4 cyl and 33's with 4.88.|
|10-04-2012 07:18 PM|
|10-04-2012 10:14 AM|
|Cuernos1||I have the following done...air raid throttle body n filter, header, electric fan, 4.5 inch lift, 1.5 inch shackle lift, slip yoke eliminator, shorty shaft, 4.88 gears, 33x10.5x15s, and a ton more cosmetically....on a 2.5l, it runs better than a lot of 4.0s off road n on road I can run 75 mph if I want in 5 th....it has plenty of pick up but I still want a bit more...|
|06-06-2012 10:29 PM|
|06-06-2012 04:16 PM|
|06-06-2012 11:26 AM|
|93YJCA||The only power reduction I have noticed is uphill in 5th gear I can't hold 60 mph. Other than that plenty of torque off road and stoplight to stoplight. Unless you need V-8 power go for some new gears and it will be great.|
|05-01-2012 09:43 AM|
|04-30-2012 09:06 PM|
|04-30-2012 04:37 PM|
Hey Everyone, FYI our Gen II 05-06 TJ/LJ system is now availible. Also we now have options availible for the 01-04 TJ as well. Give us a call or visit our website.
|04-30-2012 04:00 PM|
|Dustin Underwood||That's what my buddy was saying. Just change the gears to get more low end torque.|
|04-30-2012 03:08 PM|
If you are happy with the power you have now, you can have the same perceived power by re-gearing the axles to match your chosen tires size. This isn't cheap either, but you have a better shot of matching power with a 20% gear reduction than finding 20% more power in a normally aspirated engine.
Just my 0.02
|04-30-2012 01:38 PM|
|04-30-2012 12:59 PM|
A supercharger (or turbo) needs to move a lot of air, but it also needs to move that volume of air while producing a large pressure differential. It is this pressure differential that effectively increases the displacement of the motor and boost Hp.
But the fuel injected engine needs to know it's operating under boost and be able to deliver the added fuel to match the increased air (so their claim of improved fuel economy is bogus as well), or it would just run lean and burn up.
Personally, I wouldn't want huge Hp in the Jeep because it would make it much easier to break driveline parts. The 2.5 still has plenty of power in 4WL, and in 2WH it goes 65mph. These things are terrifying about 65mph anyway Save your money.
|04-30-2012 10:35 AM|
|Dustin Underwood||I'm trying to avoid an engine swap because my pockets aren't that deep haha. So I think I will just do the little things that increase the performance.|
|04-30-2012 09:44 AM|
|04-30-2012 05:52 AM|
|04-29-2012 06:32 PM|
what I find amusing about the add for the "new" tornado, is it claims to create a vortex thus making the air denser! Lol
a vortex swirls the air! thus creating better atomization of fuel!
it dont make it denser!
|04-29-2012 01:02 PM|
|04-29-2012 10:52 AM|
|banks316||Why not build a 4.7L stroker? Mine runs awsome. I bored out my 4.0l HO block .40 over. Installed a crank and rods from a 258. Added some Ford 19# injectors and a cam and it get s better fuel milage then my old 4.0L more power and torque. You can buy prebuilt ones for $3000 or so.|
|04-29-2012 12:08 AM|
|04-28-2012 11:59 PM|
|04-28-2012 11:54 PM|
|Dustin Underwood||I have searched for hours and can't find a supercharger for a 4.0 yj. And all that I can find are several thousand dollars.|
|04-28-2012 11:41 AM|
|04-28-2012 01:29 AM|
|XJ Knight||RIPP Superchargers|
|04-28-2012 01:02 AM|
|IslandYJ||This is where a little engineering comes in. A 2.5 L has 151 cubic inches which = 1.08 cubic feet its a 4 stroke engine so take the RPM /2 x 1.08 and you have the answer to how much "boost" this "supercharger" is going to make . At 1700 RPM your engine is already intaking 918 cfm of air. Looks like the Boys are right . Perhaps get your little sisters hair dryer and an inverter to run it but leave it on the cool setting. I used to build Superchargers all day long for Detroit Diesel I've built everything from a 2-53 blower right up to EMD train superchargers which are about the size of a small block. i'm thinking if you wanted to supercharge a 2.5 on a budget a Supercharger from a Suburau might be the ticket they are a nice compact unit and if you don't have AC you could probably mount it right there, and its already engineered for a 2.5 L engine|
|04-27-2012 11:24 PM|
|Dustin Underwood||So where could I find the best supercharger for a 4.0?|
|04-27-2012 06:37 PM|
|04-27-2012 04:50 PM|
|Blue_94_YJ||Thanks for the advice. I'm gonna have to make a note of all of that and do some research. I just got my jeep and have a lot to learn. Being a computer tech/salesman I don't have much background working on cars.|
|04-27-2012 04:41 PM|
There's plenty of power upgrades available that are less expensive than an engine swap. first and foremost is ditching that pathetic metal fan, it's so heavy and cumbersome that Jeepers have reported gaining almost 10hp by just swapping it with an electric fan.
For the MPFI 2.5L Jeeps:
-Ford 19lb injectors
-4.0 throttle body
-high flow exhaust
-high flow intake
-throttle body spacer
-high performance coil
And of course for all 2.5L's you can install a good set of aftermarket rollers to open them valves a bit longer. You'd probably need a good and hot coil to get all of that extra fuel burnt off though, but it would definitely improve low end torque.
|04-27-2012 04:29 PM|
|Blue_94_YJ||I wouldn't want it to be a monster. As is with stock size tires/rims my 4cyl has plenty of power. I don't lose mph going up hill in 5th over 55. And I purposely don't take roads where 70+ is the speed limit. But it holds 65 great. I'm just tryin to think about the future when I get a small lift and some 33's. Don't want it to be terrible.|
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