Not only for the shift points, but also to get your speedo reading the right speed again, and your odometer recording the proper mileage. Changing your tire size has thrown those off as well.
I'm a Superchips dealer and an authorized Vendor here on the forum. PM me for questions or pricing for either the Flashpaq or the Flashcal. If you can't send PMs you can email me at kolak@aol.com
To the OP, you interested in more power/economy or just want to recalibrate the speedo?
The procal is speedo, gearing, and tires size correction mostly. DTCs, and chirps, TPMS lights and other stuff. Does nothing for performance. Its the same as the Flash Cal from superchips. Cal is short for calibrator. You can also geet a flashpaq from superchips or upgrade your cal online. Thats the tuning stuff. Throttle response, shift points, ignition timing, all that cool stuff. It does make a difference.
Also.... You dont need a 14 computer unlocked. You need a 15/16 unlocked for tuning. Nothing for a 17 out yet. Only cals. Probably need that unlocked too when it does happen, but your statement is not correct.
No you dont need performance tune for 33s. Go 35s, 37s... Probably... still not "need". The cals are nice for lots of reasons, but no need. Being a 14 sport, youd be be better off regearing first. It costs a lot less to buy a chip, but if you are rolling on 3.21 gears? Not much youll feel seat of the pants.
Thats said, with an auto, the tunes make a noticeable difference. I have 4.10s auto 37s. didnt touch the computer when I went to 33.5s. Recently got the 37s. Bought just the FlashCal. to change everything. Noticed it was a big more sluggish as can be expected.... upgraded to the paq. Was and still am wanting to regear, but the chip woke it up enough that I moved it back on my priority list. Itll have 4.88 some day, but it drives great on the street right now. Even with the 3.8.
If your JK was equipt with the 255/75r17, then it was @ 32.1". A 285/70r17 is ~32.7-32.9. I just swapped mine to the 285/70r17 and my speedo is exactly 1mph slower than my GPS on both my phone and my tablet.
With that said, I still have a Flashpaq 3972 (bought from Kolak) from my 05 Hemi GC, that will work on my 14 JKU, so I will be linking it up rather soon. Will it make a difference? A little, I'll test before/after and see if any negative MPG is worth the gains in throttle.
If 'correcting' the computer for tire size can help 'regain' lost performance, couldn't you 'program' it for a larger size (than actually running) and increase performance?
I've always wondered this
(And please don't tell me it's because the come from the factory with optimum performance already!)
your motor has an rpm range that it makes its best power in. The transmitiion programed to keep it in that rpm range when accelerating. If it shifts to early it feels sluggish. If it shifts to late the motor will go about its designed redline and when a motor revs over its peak hp and torque rpm again you can actually loose power. More rpm doesn't necessarily equate to more hp. Its all a balancing act between gearing, tires, and your motor. Gearing and tires being basically the same thing. Change your tire to a bigger size and you change your gearing to a higher ratio (lower number) Your are not gaining any power. Your just reprograming your transmition shift points to keep your motor in its ideal rpm range. Another thing it will do is correct your gas mileage reading on your dash if that matters.
You used to be able to go to a dealership and have them do a reflash for larger tires. It was about $50.
No idea if they will still do it, but I can't see why they would stop.
I looked up my vin and i do have the tow package, but sadly i for got the ratio it was, but for 100% sure it wasn't the 3.21.
Im not looking for a "tune" I was just told the shift points would be off and wondered if its worth the money to correct it. they seem fine to me.
wouldn't mind turning off the tire pressure light. The description of the Procal seems a bit shifty (lol pun) the description talks about shift pints but
when you read the available features it says nothing about them.
dealer can reflash for up to 33 inch tires. The procal wont change anything unless you set it to change. If you desire it will do things like allow you to have daylight running lights, change for gear changes, tire size, Allow you to bump up the idle when winching, raise or lower the settings on your tire pressure alarm or shut it off and a few more minor things that I'm probably forgetting. I use the daylight running light thing, tire size, and tire pressure alarm adjustment.
It does not change shift points. It returns them to the factory settings. It corrects for shift points being off because speed is one of the criteria's your computer uses to shift the transmission. Its set to sense it with the stock tires and if you go bigger or smaller it throws off that calibration. The procal will adjust the computer for changes in tires size and gear ratios (changing gears does the same thing) Ive got 373s and went to 34 inch tires (305 70 17) and could definitely tell shift points were off. With 33s and 321s id bet you will notice too.
IF it doesn't bother you its not really hurting anything. What it might effect is gas mileage. Your jeep was designed to shift to get the best gas mileage possible. It will also give you a wrong reading on your speedometer and your computer generated fuel economy reading will be wrong. I guess I look at it like this. The 160 bucks I spent on the procal was worth correcting all of this. I don't know if the 500 dollars for a full blown programmer buys you a lot more. It WILL change shift points and a few other things. I heard mixed reiviews on here as to weather it really helped performance and fuel economy or not. Seems most feel it did help there 3.8s but not so much the 3.6. I had a diablo for my 06 Silverado and you definitely could feel a seat of the pants improvement with a 91 octane program and even more with the custom program I had downloaded into it.
What's your current gear ratio? If it's 3.21, recalibrating will only have minimal affect and probably isn't worth it. If you're at 3.73 or 4.10, then a recalibration would help. However, no need to spend $300 when you can get what you need for about $170. But, don't buy a used one because they can only be used on one vehicle at a time.
There is alot of discussion on these threads about shift points, recalibration, etc. You're not changing your shift points, but rather recalibrating to your correct tire size. Not only does that correct your speedometer, it also helps your transmission know when to shift based on the size of your tires. Again, you're not changing any shift points - they are staying the same - but your transmission will recognize the size of your tires and shift accordingly based on your existing shift points.
Simple procal should be good to get the shift points and speedo corrected. My willys jku with "35in" Ko2 (actually measured 34inchs even) shifted a bit off climbing up hills and my speedo was off by atleast 5mph compared to phone gps .Fixed it with the procal drives as normal as it gets now. Ps its nice to lower the tire pressure treshold with the procal so the TPMS does not go nutz. Ps programming is stupidly quick.
Thank you all, answers my questions.
Went ahead and ordered one.
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