I only went with a leveling kit, 33 Nitto Ridge Grapplers and new wheels on my '16 JKU Sahara. Love the look, and it still drives great. But, I did lose a little bit of power. I adjusted the tire size with the jScan app, so my speedometer is correct, and I thought it also adjusted shift points with the tire size change (not sure about that part, though). I have stock 3.73 gears. I know regearing would add any lost power back, but I'm not currently looking to regear to 4.11. What other simple modifications can I do to restore a little lost power? How does a cold air intake do on these Jeeps? Does it improve power or gas mileage at all? Anything else I should consider to add just a touch of performance back to it?

 

You are where you are. CAI won't make a difference and lots of times isn't a great idea on this vehicle. Outside of getting a bit more of a growl they're a waste of time. Even a regear isn't going to feel like you just added forced induction or anything, just makes the jeep drive/shift more appropriately, but as you note, moving from 3.73 to 4.10 isn't but a hill of beans. You have to move 2 gear sets to be worthwhile, and even that isn’t going to be this huge difference in the seat of your pants. I'd say it's time to accept how it is and enjoy it.

 

Thanks.That's what I thought on the CAI, but wanted to ask someone who might know for sure. I'm not unhappy with it at all. It's still not overly slow and still fun to drive. It does seem to shift a little funny, winding up higher than I think it should if I give it a little gas on takeoff. It also spends more time in 4th than in 5th than I think it should....especially in the mountains. That's why I'm not sure if the jScan adjusted the shift points with tire size change, or if I would have to use the $500 superchips tuner to do that.

 

I'm pretty sure that jscan worked to change the tire size, but you can easily check speedo vs. GPS phone app and see if they match. When updating your tires size it often takes a couple tweaks to get the speedo spot on. Not that it matters in this situation, just more FYI. I just keep adjusting until my speedo is as close as i can get it to accurate.....it doesn't matter what the tire size number I have to plug in to get it there is....course it never feels good to say my 37s measure 35.4" at 25psi to make that work. . Whatever. Some people might have a different opinion, but on my jeep i don't care to risk any water crossing with CAI. if you pick up even 1-2HP you're not going to feel it. I'd rather stick with my factory box and swap in a new filter than clean a CAI constantly due to all the offroading dirt. I think most have the same general opinion, but you know how opinions are . Maybe look at a pedal commander for throttle response. I've never considered one so can't tell you much about it, but throwing it out as something you can look at.

I think it's pretty normal for jeep to hold gear a bit longer than you'd think in situations like climbing in the mountains and heavy acceleration. Mine did with stock gearing and every gear set after that. We all have different geographies though, and that surely plays into our own "normals".

 

I noticed that. I have 33's, but I had to adjust to 32.25" to get it to match my phone gps speedometer app accurately. Now, it's within .5mph accuracy at 70mph. So, I'm good with that.

 

I have a cai and magnaflow exhaust and it sounds pretty sweet but there isint enough of a gain to really feel anything. The only thing i did after the 35's to make it feel a bit peppier was to go to 4.56's

 

I'm not looking to regear right away, but I'm curious...how much difference do you see in takeoff, low end torque and top end speed going from 3.73 to 4.56?

 

I'll continue to comment with my 2c since others aren't jumping in.

You're not going to see any difference in top speed at all. You're not adding HP. The only difference is what RPM the engine will be humming at relative to where it used to be at the same speed. This isn't exact, but if you want a general idea, next time you're on the highway just drop it from 5th gear down to 4th. I'd suspect that 4.56 gears with 33s that probably measure closer to 32 would land you around 2700-2800 RPM at 70mph. A lot of times the tires people add are large enough that they practically lose 5th gear on the top end......as in can't even maintain speed in the slightest wind or incline so you're pretty much in 4th anyhow, and have to downshift to 3rd to pass people. That kind of stuff gets old. On the low end I don't think you're going to notice a ton off the line. You probably would notice it more going 30mph on a residential road going up a big hill and maybe not having to downshift where you had to before. You definitely notice it offroading technical things cuz the jeep has a much lower crawl speed which equates to control.

 

You have to enter the actual size of your tires mounted on the vehicle not the advertised size. Measure from the ground to the center of the hub then multiply by 2 to get your actual rolling diameter.

 

i went from 4.10's to 4.56 and there was a notable difference ide imagine going from 3.73 to 4.56 it would be pretty noticable. on 35's that measure at 34 im doing right at 2500 in 6th at 70 mph