Hey fella's, im new to the site. I recently purchaced an 04 TJ jeep Wrangler, with a World 2.4L 4 cylinder motor in it. The motor runs really good with a 5 speed behind it, but with the 28" tall jeep tires, it looses power on the hills while in overdrive. The 2.4L motors that are in the jeeps have 9.4:1 c/r, which i believe is a bit much for a turbo set up. My ? is, is it worth the effort to swap out my jeep 2.4L motor, for one of those Neon SRT-4 turbo motors. Another ? is, if it is posible, what would be some of the pro's or con's with this kind of swap in a TJ jeep wrangler? For now the jeep suspenion is still stock, but will probably stick 31" tall tires on in the future. (Please Advise)
J.W.
06-09-2006, 11:23 PM
i think the motor in the srt4 is a transverse mount motor....the wrangler needs a longitudinal (<<spelling?)...just one of the problems you would have....
streetmaster
06-09-2006, 11:33 PM
Hey thanks for the heads up on the mounting of the engine, (Bumer) Now im wondering what else i can do to help me out on the hills with bettering the performance of motor. The things only got just under 19,000 miles on it.
Andy
06-09-2006, 11:45 PM
Interesting. No info for ya otherwise though.
rice_eater
06-10-2006, 11:55 AM
Turbo the stock engine. just keep the boost low, timing retarded, and keep the intake charge cool (a.k.a. intercooler). Turbo kits go on stock SOHC neons all the time with 9.8:1 compression, DOHC is 9.6:1. Just my 2 cents.
srt4tech
06-18-2006, 04:31 AM
i believe the engine in your jeep should be a 2.5 engine
the srt4 engine is completely different. go with the normal bolt
ons and possible turbo or supercharger possibly.
streetmaster
06-18-2006, 10:14 AM
ThanX for the heads up on the 2.5, but it is a 2.4, because its got the duel over heads cams, a composit intake manifold, plus thats what the information told that came with the vehicle when i purchaced it. I stopped in at the dealer to ask them about this converssion, and he told me that the 2.4 thats in the Neon SRT-4, has a much lower C/R, and probably stonger rods, and better pistons. All in all, i've only had the TJ for a few weeks now, and i kind'a lerned how to get little 4 banger move'in down the road. This little 2.4L motor is much better than any other 4 popper that i've ever ran before, its just that you cant expect to run the 32"s and up, for tires, with out lose'in your top end. But mine has the 4.11 gears already in it, so i believe that i will get away with running 33X10.5=15s on mine.
rice_eater
06-18-2006, 03:23 PM
The Internet is a wonderful tool. Just researched your engine for you. It is not the "World 2.4L", that engine wasnt even built in 2004. It is basically the same 2.4L DC has been using since the Stratus came out, which can actually be traced back to the 2.0L engines used in neons. The 2.4L is a 2.0L block that has been stroked from 3.4" to 4.0" (same 3.4" bore). It was used in the Stratus, PT Cruiser, and yes, the SRT-4. But that is just the block, you do not have the same internals in you're 2.4L as the SRT 2.4L. That said, your compression ratio is 9.5:1, plenty low enough for a mild turbo kit. (like i said before, 2.0L engines run turbos all the time with 9.6-9.8:1 compression) If i were to take a guess, I'd say your internals are about the same strength as the 2.0L, meaning your rods will be the first to go if you over do it. A 2.0L can handle roughly 230-250 lb/ft of torque (@ crank) before popping a rod. I'd say that would be about the limit on your engine. A small turbo would get you there nicely, depending on how it's tuned. Good Luck.
BTW, basic bolt ons such as header, exhaust, CAI, and slightly more aggressive cams would probably net you 180-190 Bhp, but you wouldnt have the nice flat torque curve from a turbo, and you'd probably spend nearly as much money by the time everything is tuned in. Just my 2 cents.
streetmaster
06-18-2006, 06:34 PM
ThanX rice_eater for your insite aswell, i supose that i could delve into this turbo stuff from all angles, but the darn thing runs pretty good the way it is. Ill have to do a lot of thinking about it before i do it.
Andy
06-18-2006, 06:46 PM
put a HEMI in it
LOL
elchicoyes
06-19-2006, 03:47 AM
put a HEMI in it
LOL
Hell Yeah! :gr_patrio
rice_eater
06-19-2006, 01:55 PM
put a HEMI in it
That would work too! LOL
davet
06-21-2006, 02:09 PM
I've had Jeeps for about 15 years. I subscribe to a Jeeps only forum and also a Jeep only magazine for several years. I've had several Jeeps including my current 1956 CJ-5 with factory 4cyl. The header and catback have not shown to give a "seat of the pants" increase in power on the 4cyl. They regularly are shown to be louder with no increrase on the dyno. The larger throttle bodies from a 4.0 liter will bolt on but will cause a flat spot off idle with little if any power increase. The air intake systems have had mixed reviews as far as power or MPG improvement. The best "bang for the buck" way to get your power back after going to larger tires is to change the gear ratio in your axles. I believe you currently have 4.10 gears with the 4cyl so 4.56 would be the minimum I would run for for 33's and I would probably run 4.88's with 33's. There are formulas for figuring what ratio is correct to account for the increase in tire size. Do a search for gearing ratio formulas for more accurate numbers. Remember, if the formula shows you should run 4.56 gears to get back to stock RPMs go the next size up numerically to account for the extra weight of the tires and the increased height due to the lift needed to run the tires.
05hemiregcab
06-25-2006, 04:51 PM
as the ricer guy said... You compression is fine for boost! hell mach 1s are 10.5:1 and people supercharge them and turbo them all the time! Just are more prone to denation and all sorts of other things... your tunin has to be even more accurate and on the money! You could turbo it like he said.. which would give you awesome tq and hp... and if you do it right then it will be reliable all the way! If you want to go even more reliable you can build up all motor!
If your motor is in fact the 2.4 then there is all sorts of things you could do! As he said get your hp numbers right around 200 all motor.. tq probably around 150-170.. wide range because I am unsure! But do all the bolt ons possible! set of cams crane 14's or 16's would be nice for an all motor setup! cam gears to help tune it.. then something like a safc to add and pull fuel! Your gonna need extremely tall gears with the tire size and such a small motor! just research it a little more!
