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Topic Review (Newest First)
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
Dustin Underwood
Quote:
Originally Posted by 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...
What rpm are you running at 75 mph? Would think it is quite high with 4.88 and 33's.
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
Wrangler Haven
Quote:
Originally Posted by Blue_94_YJ View Post
Come back when you got some love for the YJs.
No shit. And until you do, stay the hell out of the YJ forum.
06-06-2012 04:16 PM
Rednecksedan
Quote:
Originally Posted by 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.
Got my quote td can't wait with the additional bolt ons jeep will be hauling ass and still be original and not a chevy
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
Blue_94_YJ
Quote:
Originally Posted by RIPPMODS View Post
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.

RIPPTECH
Come back when you got some love for the YJs.
04-30-2012 09:06 PM
XJ Knight
Quote:
Originally Posted by RIPPMODS View Post
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.

RIPPTECH
Sorry RIPP guy.. Trying to help out a guy with a YJ in this one.. Any info on working on a supercharger for the pre 97 4.0's?
04-30-2012 04:37 PM
RIPPMODS 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.

RIPPTECH
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
rruss 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
Dustin Underwood
Quote:
Originally Posted by rruss

It draws 2.2amps at 12V - so about 26 watts, or 0.035 Hp to run it. Ask someone with a big supercharger how much horsepower it takes to drive the blower!

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.

-Russ
I don't care about the high speeds. Jeep + high speeds = roll over waiting to happen. I just want more horse power and torque. So when I get a lift and bigger tires I can still make them spin in the mud and stuff. But thanks for all the information.
04-30-2012 12:59 PM
rruss
Quote:
Originally Posted by Dustin Underwood View Post
It draws 2.2amps at 12V - so about 26 watts, or 0.035 Hp to run it. Ask someone with a big supercharger how much horsepower it takes to drive the blower!

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.

-Russ
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
banks316
Quote:
Originally Posted by Dustin Underwood View Post
Like the hole 4.7l stroker engine for $3000?
Just the block, head and internals. No valve cover, oil pan, no fly wheel/clutch or any add ons like water pump, alt, ect.

http://www.ebay.com/itm/Titan-4-6-4-...#ht_3184wt_905 Exsample
04-30-2012 05:52 AM
denisbaldwin
Quote:
Originally Posted by XJ Knight View Post
I have not seen one either for pre 97 4.0's yet and all super chargers are 3-5k
Sounds about right. I know when I supercharged my F150, the kit was around $3500. You could definitely feel the "seat of your pants" difference when it was in though!
04-29-2012 06:32 PM
spunebil 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
Dustin Underwood
Quote:
Originally Posted by 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.
Like the hole 4.7l stroker engine for $3000?
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
Dustin Underwood
Quote:
Originally Posted by XJ Knight

I have not seen one either for pre 97 4.0's yet and all super chargers are 3-5k
Yeah it is really annoying and if they are all around that price that would make a lot more sense haha
04-28-2012 11:59 PM
XJ Knight
Quote:
Originally Posted by Dustin Underwood View Post
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.
I have not seen one either for pre 97 4.0's yet and all super chargers are 3-5k
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
denisbaldwin
Quote:
Originally Posted by Xpress View Post
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.
I have all the stuff to do this now.. should really get this mod done in the next week or so.
04-28-2012 01:29 AM
XJ Knight
Quote:
Originally Posted by Dustin Underwood View Post
So where could I find the best supercharger for a 4.0?
Don't here much supercharger talk with the YJ's or at least I haven't but the best made supercharger out there IMO is 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
year1camaro
Quote:
Originally Posted by Xpress View Post
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
-headers
-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.
So true.... my friend has a 4popper and its fine on power. All the little things he did made it much better than stock. Takes the highway at 75 steady every day to work. Runs like a clock.
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
Xpress 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
-headers
-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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