New tires, calibration questions.... - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

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  #26  
Old 07-14-2009
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i think i will go with the one on ebay you have. i hope all goes well with it. does it come with step by step instructions?
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  #27  
Old 07-14-2009
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and how do i know if i have an ABS system?i dont think i do dunno
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  #28  
Old 07-14-2009
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I bought mine off of ebay. same seller i believe, i just paid more. It comes wit printed instructions, you can even read them off the Dakota Digital website, the first link i gave you for the dakota unit, read them so you can understand how the unit works.

You do have abs. you just have to figure out if you have 4wheel/2wheel abs. Tomorrow when you have a chance. take a peek at the front spindles/behind the front tires. and see if you have some wires that go to the abs sensors. if you dont see any wires on the front of the spindles you have 2wheel abs. You need to know this for the install
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  #29  
Old 07-14-2009
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alright cool, ill have a looks tomorrow. thanks again for all the help.
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  #30  
Old 07-14-2009
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My understanding is that it confuses the PCM to think like those tires were never put on it, correct?


I think you may even be able to have the ford dealer reflash your PCM to take in account for your new tire size.


Couldn't he just pop the hood and look at the ABS fluid box thing in front of the engine bay fuse panel? 4whl ABS would say '4x4' on the golish colored box. If it's just RABS, it would say '2wd'? I think?
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  #31  
Old 07-14-2009
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Quote:
Originally Posted by Fx4wannabe01 View Post
My understanding is that it confuses the PCM to think like those tires were never put on it, correct?


I think you may even be able to have the ford dealer reflash your PCM to take in account for your new tire size.


Couldn't he just pop the hood and look at the ABS fluid box thing in front of the engine bay fuse panel? 4whl ABS would say '4x4' on the golish colored box. If it's just RABS, it would say '2wd'? I think?
Yes Shane, it does 'confuse' or 'trick' the pcm into thinking that it has stock size tires. thus 'calibrating' the speedometer and such. The ford dealer can reflash, but at about the same price, you can buy the unit and be able to further 'calibrate' it for future tire changes, and can go back to stock by just setting the ratio 1:1 or just removing the unit. I'd say for those who will keep modding, it is a great low-price investment.

As for the ABS, i'm sure you can look at the ABS unit under the hood (looking at the # of lines running from the box), but I think looking at the spindles is much easier. 2wd (Gen 4?) rangers came in both RABS & 4WABS. 4x4 all came with 4WABS i believe.

EDIT: Also note, that in this Gen of rangers, gear changes do not affect the speedometer. Nor do programmers.
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  #32  
Old 07-14-2009
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damn the price went back up on the ebay one....oh well
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  #33  
Old 07-14-2009
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did it? wow that sucks. It's still a pretty reasonable price tho. Especially compared to the $200 superlift unit.

Keep searching around ebay, you might find a good deal on it. It is the SGI-5 Unit. make sure
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  #34  
Old 07-15-2009
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well running into a lil financial situation. got the insurance bill today, and since i started a new policy with my parents insurance (trucks not in my name since im only 19 and would cost me a fortune) i owe my mom $150 for the start up fee, then im going to buy new front shocks tomorrow and install. reason being is they squeak and squeal bad when i hit speed bumps and i have already replaced back ones. i dont want wearing of my front tires because of old shocks either. so $50 for both after tax at autozone. so with all that, leaves me $60 in the bank till next friday :'(.... then next friday i wanted to get a new valance LINK since mine is all messed up and only being held up by a little bit of plastic clips that are left. mine doesnt have the foglight holes but i want them, then going to get fog lights too next check.....but i dunno, will have to see how much next check is. if not enough, speedometer thing comes first then the valance and fog lights. then cd player LINK(want the usb for my usb powered 250gb external hdd, 3500+ songs and no worries of charging an mp3 player or anything) then eventually a paintjob and more :P.....damn i wish i was rich haha
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  #35  
Old 07-15-2009
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Originally Posted by LancerRevo View Post
damn i wish i was rich haha
Don't we all? Well good luck with that man. Its understandable that s**t happens. If I were you, I'd check a junkyard for that valance and fogs, could save you some good money. I think the fog brackets are expensive...and you would need to still buy bulbs...
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  #36  
Old 07-15-2009
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Im fairly sure alot of people on this forum "including me" HAD spare $$ but then we see all the hot looking rangers posted on here and want our trucks to look just like them and soooo... here we are flat broke. but.... we do have some new stuff for our rangers.
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  #37  
Old 07-15-2009
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I just had the dealer flash my (Pacific Green) Ranger when I changed tire & wheel size....it was part of the deal when I bought it new.
I am not sure if the dealer can flash any Ranger for any tire size....sometimes only the sizes that come stock with your model?
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  #38  
Old 07-15-2009
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Originally Posted by bb1 View Post
I just had the dealer flash my (Pacific Green) Ranger when I changed tire & wheel size....it was part of the deal when I bought it new.
I am not sure if the dealer can flash any Ranger for any tire size....sometimes only the sizes that come stock with your model?
I'm sure they can program the GEM to any rev/mile. But it's a one time deal...good unless you plan to change to different tires later...then you are S.O.L.
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  #39  
Old 07-15-2009
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Originally Posted by demiseranger View Post
I'm sure they can program the GEM to any rev/mile. But it's a one time deal...good unless you plan to change to different tires later...then you are S.O.L.
The mechanic at my dealer said that they could only flash my Ranger to the largest size tire available for 2wd's....they could not flash it to Ranger 4X4 size tires.
And when I had engine problems (intermittent MAS), the computer in my LX had NO memory....I had to bring it several times until it was (doing it) running poorly while at the dealers.
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  #40  
Old 07-15-2009
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Well they are incompetent, all they need to do get off their lazy a**es and plug in some #s that you can calculate. Typical dealer work tho.
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  #41  
Old 07-16-2009
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Originally Posted by demiseranger View Post
Well they are incompetent, all they need to do get off their lazy a**es and plug in some #s that you can calculate. Typical dealer work tho.
There (top) mechanic said that the computer in my truck (an XL) would only take/flash certain sizes. I asked when I bought it new what the largest size tire they could flash....they tried and came up with 235 75 15 (the largest 2wd size).
And when they did, they took it for a drive to make sure it was calibrated perfict....nothing "lazy' about that.

But that the computer in my truck had NO memory was weird....is that only in the XL?
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  #42  
Old 07-17-2009
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um does the odometer get effected with bigger tires?i was being told today it may be effected with new tires....how can that be fixed?or is it just older vehicles?or what?

just to make sure, can someone make me a list of for sures or possibilities of things that happen/could happen with new tires?
i know speedometer and gas mileage could be affected, but what else?

older tires are:p225/70R15
new tires are:31x10.50R15LT(not sure if its O or 0 after the 10.5)
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  #43  
Old 07-17-2009
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Personally I wouldnt worry about it. I went from stock 245/75/16 to 32/11.5/15 and didnt change nothin. My cousin "cop" checked my speed with his radar gun and it was pretty dam close to the right speed, not enough difference to get a ticket.
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  #44  
Old 07-17-2009
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yeah im going to ask my stepdad to ask some of his friends in the sheriff department to see if they can check mine. or randomly ask a cop to check my speed for me one day :P
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  #45  
Old 07-17-2009
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Quote:
Originally Posted by LancerRevo View Post
um does the odometer get effected with bigger tires?i was being told today it may be effected with new tires....how can that be fixed?or is it just older vehicles?or what?

just to make sure, can someone make me a list of for sures or possibilities of things that happen/could happen with new tires?
i know speedometer and gas mileage could be affected, but what else?

older tires are:p225/70R15
new tires are:31x10.50R15LT(not sure if its O or 0 after the 10.5)
Here you go Phil. Takes all the work out of fig diff tire sizes. Tire Size Calculator - tire & wheel plus sizing

Just plug in your stock size then the size of the new tires. Use the "additional sizes" for the new tires.

Right now your speedometer AND odometer are off by 13.2% slow. That means when you're indicating 60, you're actually going 67. Also when you have actually driven 113 miles to odo will say only 100. So you are going faster/farther than indicated.

Hope that helps.
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  #46  
Old 07-17-2009
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hugo, did you have your unit for sale on ebay? i think i just bought it, hahahaa
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  #47  
Old 07-17-2009
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Originally Posted by LancerRevo View Post
yeah im going to ask my stepdad to ask some of his friends in the sheriff department to see if they can check mine. or randomly ask a cop to check my speed for me one day :P
The dealer mechanic had me drive the truck while he checked the flash....he also checked mile markers on the side of the road against the odometer, an easy check for anyone to do. Just click/push the trip-omiter at the marker, and check if it flips over right at the next one.
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  #48  
Old 07-17-2009
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Quote:
Originally Posted by jamesxEDGE View Post
hugo, did you have your unit for sale on ebay? i think i just bought it, hahahaa
Yea man, haha I think you did, but that one was a superlift unit I bought off of nbro3232, I ended up getting this other box though. PM me if you need my # or anything. Good luck with it.
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  #49  
Old 07-17-2009
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does my fuel gauge get affected? how do i get my odometer fixed?

EDIT: how did you do the math for how much im really going and how many miles and all?
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  #50  
Old 07-17-2009
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Quote:
Originally Posted by LancerRevo View Post
does my fuel gauge get affected? how do i get my odometer fixed?

EDIT: how did you do the math for how much im really going and how many miles and all?
Your odometer goes off of your speedo basically. Fuel Guage is not affect...
To calculate the difference in size/speed.

New Tire Diam./Old Tire Diam. = Difference
Ex. 31"/27.4" = 1.131386861 => 13% difference
If you take for Ex: 1.31 x [Current Speed] = Actual Speed
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