Thermestat and chips

JeepJunky33 · **Posted:** Thu Oct 27, 2011 1:25 pm

I am looking squeeze a bit more power out of my 3.7 now that I have an ARB hanging off the front.
Is it worth it for a chip?
Any thoughts on switching to a 180deg thermestat?

If I swith the thermestat am I just going to kill fuel economy?

Thoughts?

tjkj2002 · **Posted:** Thu Oct 27, 2011 1:44 pm

Will kill mpg's and power with 180 t-stat,may also pop the MIL with code P0128 also.Unless you hit about 200 degrees your not going to go fully into closed loop status.

JeepJunky33 · **Posted:** Thu Oct 27, 2011 1:46 pm

Thanks man,
So how do I go about pulling a bit more power from my 3.7?

tjkj2002 · **Posted:** Thu Oct 27, 2011 1:57 pm

JeepJunky33 wrote:

Thanks man,
So how do I go about pulling a bit more power from my 3.7?

You can get the PCM flashed by B&G,Fastman TB,headers(if you can find a set,no longer made) and you may get 15hp.The best way to pep up the KJ is to regear to 4.10's.

tommudd · **Posted:** Thu Oct 27, 2011 2:03 pm

4.10s will make a huge difference for sure, well worth the cost in the long run

fasta76 · **Posted:** Thu Oct 27, 2011 10:30 pm

Would 4:10 be to much of a change with 245/75/16? will the MPG drop much?

tommudd · **Posted:** Thu Oct 27, 2011 10:39 pm

03CDKJ is running 4.10s and 265-70s same height basically as 245-75s and doing great , way more power for sure

JeepJunky33 · **Posted:** Thu Oct 27, 2011 11:07 pm

This may be a bit of a...tree-hugger questions, but arent we all a bit... How does switching the 4:10's effect mpg's?

JeepinJarhead03 · **Posted:** Fri Oct 28, 2011 5:34 am

same reason using a pulley to lift a piano up to the second floor is easier than standing on the second floor with a rope and pulling it up hand over hand

less work / strain

we - for most intents and purposes - started out stock with 3.73 or higher ratio gears with 29"ish tires and most go up to 30.5 (245-75) or 31's or 31.5s or 32s

bigger the tire, the higher, and farther away from the stock ratio you get. IMO they were barely low enough with 3.73s with 29" tires for my taste, but.. 4.10's would have seemed too low for most at a stock level - on the other hand.. with heavier vehicles, heavier tires, and larger / taller tires than what we came with stock, 4.10's bring it back into perspective very very well

JeepJunky33 · **Posted:** Fri Oct 28, 2011 9:28 am

JarHead,
Thanks, That makes sense. I was looking online and could only find front gear 4.10's (since this is my first attempt at changing gears I want to be sure. Do gears matter front to rear? In my head they do (but alot of things make sense in my head). Where do you get a matching set front and rear of 4.10's?

tommudd · **Posted:** Fri Oct 28, 2011 9:52 am

Hard to find front 4.10s since only Spicer makes them for the D30A
rears lots of companies make them but only a few are good

JeepJunky33 · **Posted:** Fri Oct 28, 2011 5:49 pm

tom,
wanna help me out with some links?

fasta76 · **Posted:** Fri Oct 28, 2011 10:30 pm

From what Ive found this place has them both in stock! front and rear!

http://jeepinbyal.com/

JeepJunky33 · **Posted:** Fri Oct 28, 2011 11:13 pm

Lol...I never thought to check JBA...

Thermestat and chips

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