09 wrangler engines - Page 3 - JeepForum.com
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post #31 of 33 Old 04-03-2009, 04:47 PM
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2007 JK Wrangler 
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Originally Posted by jeepfreak4life7 View Post
I like how people are saying that they should bring back the 4.0, when they don't even realize that the 3.8 has more power and torque. If you put the 4.0 in a JK, it'd actually be even worse...
YOU are exactly RIGHT.

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post #32 of 33 Old 04-04-2009, 01:41 AM
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1990 YJ Wrangler 
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Originally Posted by GasAxe View Post
But you need to run the 3.8 at redline to get the extra horsepower. The 4.0 (and even the 4.2 with FI) produce a better horsepower/torque ratio at lower rpm's. Thats why it's better to swap in a diesel or V8 rather than a turbo charged 4 banger.
Actually, if you look at the torque curves, the 3.8 makes the same amount of torque at idle as the 4.0. It just maintains that toques as the RPM's go up.

Originally Posted by JonBoy1 View Post
YOU are exactly RIGHT.
I love the 4.0 as much as anyone else, but I just can't stand people (it seems like it's mostly the TJ people) who jump on the JK/3.8 Bashing bandwagon when they don't know squat. Whats even worse is I see posts saying "I hate the new engine in the JK, I think it's a 3.7." If you don't even know what engine is in it, then how can you hate it?

I test drove a JK once last year and I was very impressed. The 3.8 had enough power for me. It wasn't a dragster, but it had plenty of guts. I was expecting it to be a complete dog from what people have said on the forums.

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post #33 of 33 Old 04-06-2009, 07:51 PM
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Originally Posted by XJ2Timer View Post
You can't really keep a V6 balanced if you shut down cylinders.
Shutting down cylinders by deactivating the valves DOES NOT alter engine balance whatsoever. To keep it smooth you always have to shut down 1/2 the total number of cylinders so where a v8 will deactivate 4 cylinders, an I6 or v6 will deactivate 3.
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