Purple wrote:
How much of an improvement could someone see from a HP point of view?
I am looking at getting K&N cone filter, TB, Headers (when available) from JBA, exhaust, possibly the pcm flash as well.. how much would i be looking at with these mods?
Don't do before and after dynos with small modifications. You'll be dissappointed. Just use the dyno when doing big stuff so you don't blow it up. The mods you've listed will open up your Jeep considerably. If you've driven a 4.0 Cherokee, you should feel right at home, or even better depending on how well your combination works together.
Jstodda79 wrote:
More air is never a bad thing.. unless your fuel doesnt keep up with it, or the power it makes is too much for the engine (turbo, supercharger, etc). Milage increases usually with increased A/F, IE filters, TB, upgrade, etc.. only when the computer has to pour fuel into the engine to compensate for the increased air, do you get performance with less milage. Like I said, generally this is true.. Shaving the "bar" on a TB is a common upgrade/mod in most vehicles.. Its amazing what a little bit more air can do
I have known some to shave the TB plate too much, making it too thin and it actually bent/broke at WOT.. not good, but this looks to be very well done, something I will def do in the future.
The 3.7's fuel pump does pretty good. My 3.7 was running way too rich at first. My fuel pressure stayed right at 51 psi even with a 100 hp nitrous jet, and a 35 hp fuel jet, at a really rich air fuel ratio of around 11:1 and was still reading over 250 rwhp and over 300 ftlbs torque. You're going to have to do a lot more than intake modifications before you need to upgrade your fuel system.
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