Yeah, I noticed a little of both but it wasn't much. I think if I was on stock wheels I would have noticed a bigger gain. 35's rob you of so much torque it's difficult to quantify the impact of incremental gains from individual upgrades. Also, I'm running stock exhaust.

With a sprint booster, the throttle body, the cold air intake, and the 89 octane tune from the Flashpaq I notice a difference. Individually they're marginal. An aftermarket exhaust combined with all the other stuff might have a bigger impact.

Hope that's helpful.

 

I like this thread!
I'm running stock right now living in CO with an automatic, 3.73 gears and the Rubicon wheels and tires, I have issues running up into the mountains, mainly with shifting up and down a lot, also when climbing off road or playing in deep snow it bogs and I have to drop into low lock before I think I should (meaning I like to save low lock as a last resort to get my butt out of trouble). As for the sprint booster anyone in CO know does it help with the shifting up and down when heading up into the mountains or bogging when off-roading?

Anything that'll help increase mileage is a huge plus!!!
I was thinking about adding an intake and possibly exhaust later (if needed).
When ever I talk to one of the 4x4 places they always say you have to re-gear (hate that answer even though they might be right)... Like mentioned earlier about $3000. Not going to be in my budget anytime soon...

I've thought about the Flashpaq but understand that voids my warranty so not willing to do that either.

I talked to a guy who did a 2” lift with 35’s added an intake and exhaust along with the sprint booster and he also tows a popup camper up into the mountains, he says he’s happy as can be with his setup. But then again there are people who are happy driving their Volkswagen bus’s up into the mountains at 45 mph…. I’m not one of those people.

 

Hey Gersh.
I'm just a regular guy with a little bit of mechanical knowledge. I'm not a hard core Jeep freak who eats and breaths all things Jeep - like some of the guys on this forum. I can only tell you about my own experiences. So this is what I think:

The SprintBooster isn't going to help your shift points. It only makes the throttle more responsive by eliminating the lag between the pedal and the throttle computer. I think it also decreases the amount of travel between idle and full-throttle. ie. you put your foot halfway to the floor and the throttle is wide open (I'm not saying that's the ratio. I'm just using that as an example). As a mod I wouldn't say its a must have.

Same with the CAI and the throttlebody spacer. It's not a must have. If you're not sitting on a ton of cash and you need to put what you have where it will do the most good, this isn't the answer.

The Flashpaq will probably give you the biggest gains and it WILL let you adjust the shift points on your transmission. If you spend the time to figure out how to do this it will probably solve most of your bogging issues (it has a "Towing" program that might be an easy answer.... I think it increases the RPM threshold on the transmission shift points to a certain degree). The thing about your Flashpaq is that before you bring your Jeep into the dealer you HAVE to flash your Jeep back to stock settings. If you don't your dealer will erase all your settings and may or may not void your warranty. I forgot the first time and my dealer was cool with it. They never even mentioned it except in the description of what was done on my invoice. The only drawback is fussing around with the programmer. It's not fast and if you're dealing with the advanced functions its not entirely straight forward. Personally I find the whole thing a bit scary. We're f#$%king with the computer after all!

Re-gearing is the only sure way to get back the torque you're losing when you're playing in the mountains. Living where you do, the thin air at altitude probably isn't helping things. I'm on 4.1 gears with all these mods and its only just acceptable. I tow a trailer with 2 snowmobiles and I get where I'm going but the engine is working way harder than it should. Your buddy with the 3.73's on 35's with a camper must have a lot of patience.

If I'd known better I would have saved up all the money I spent on CAI's, Flashpaqs, Sprintboosters etc and done the re-gearing first. As it stands, I've done all that stuff first, found out it wasn't enough, and still have to do the re-gear. I'm going to 4.88 or 5.13 this summer.

 

I just installed the aFe throttle body spacer by itself with the stock intake and stock exhaust. I noticed a bit more response out of the throttle and no whistling like everyone complains about... Can't wait to get the aFe si intake installed followed by the Dynomax exhaust!!!

 

Snowstorm thanks for the info!!! Yeah I think I'm going to hold off on mods for a while till I know exactly what I really want to do...
Thanks again...

 

So i just went through this thread hoping to find some info for help in purchasing the correct intake to help save a bit in gas for my 2011 unlimited..

Anyone have any other input on this seeing as i'm digging up an old thread.? No sense in starting a new i suppose.

BTW, i am all for getting a Flashpaq but they are not available for the 2011 model year vehicles yet. Has anyone with a 2011 seen a decent improvement with the use of a spacer and intake.?



Lets keep the good info coming.
T.I.A.

 

Well, here's the thing. None of these add ons are going to save you any significant gas money on their own. I have ALL the goodies and only when I added the sum of all their benefits could I say there was a clear advantage over stock. You'll be $300'd to death (in accessories)... or up to a couple grand at least, until you can really notice anything significant.

Sorry, I know that's not what you want to hear. If I had to pick two mods I'd take the Flashpaq tuning my JK for 87 octane gas but actually running 89. Then the cold air intake.

If Jeep put a modern 6 cylinder in the JK. One that had an efficient 300hp and some low end grunt (standard these days in a lot of other vehicles), they'd make a lot customers happy (and put a lot of mod companies out of business I suppose). Heck, a diesel would sell like crazy. But thats only a European option I think. Go figure.

 

Thanks...

After spending a few weeks on here now it looks like you are spot on.

I would be all over the Flashpaq but its useless to me with the 2011. At least for now. (and what the heck is taking so long with that ??????)


I agree with the motor, and iprobably should have waited for the 2012 but we have some financial situation going on and i needed to pounce on it sooner than later.

With that said the Wrangler seems to be getting better mileage with every mile that goes on it.. I average around 18 and its climbing slowly..


It would take a while to get my money back after spending 300.00 + on an intake spacer etc.

 

Anyone using a tb spacer and a k&n drop in filter instead of a cai? If so were the gains noticeable and what tb spacer did you use?

 

Hasn't it already been proven that intake/throttle body spacers do not affect engine performance in EFI engines? CAI will give you minimal gains if any. Your better off just saving for gears or supercharger. If those are not in your budget, a programmer or a cat-back exhaust will give you better performance than the CAI.