retune speedometer with xcal2??

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retune speedometer with xcal2??

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Mustang Forums >> Ford Mustang Tech >> 2005 - 2008 Mustangs >> 4.0L V6 Specific >> Drivetrain Performance >> retune speedometer with xcal2??

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retune speedometer with xcal2?? - 7/18/2006 7:42:48 PM

jittie

Posts: 134
Joined: 7/8/2006
From: Florida
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When I ordered my CAI + tuner from Lidio at Alternative Auto he mentioned that I would be able to retune my speedo since the tires on my new wheels make the overall diameter about an inch smaller. When I actually installed the tune on my car, the only option I saw about wheels was the "wheel revolutions" parameter or something like that. The options were to increase it or decrease by 500 revolutions per minute I think. Is there where I would be able to retune the speedo to make it correct again? Has anyone else done this, or know anything about it?

The stock size tires were 215/65/16 and my new tires are 245/40/18.

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RE: retune speedometer with xcal2?? - 7/18/2006 7:48:15 PM

onefastv6

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From: san diego
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its definately not minute because that varys by the speed your moving (obviously) i dont get why they have to make it so complicated. i would call whoever you bought the wheels/tires from and ask how many revolutions per mile the tires or do

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RE: retune speedometer with xcal2?? - 7/18/2006 7:59:14 PM

jittie

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From: Florida
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i just checked out this website http://www.csgnetwork.com/tireinfo4calc.html and according to the site if i'm doing 63mph i'm actually traveling at 60mph, but it feels like when i'm going 70mph i'm actually traveling like 60 or so. This might be because i'm still used to hearing the exhaust i had in my gt before i bought my v6, or maybe something to do with the greater visibility out of the windshield. I guess we'll see when i get my flowmaster this week!

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RE: retune speedometer with xcal2?? - 7/18/2006 8:09:02 PM

onefastv6

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good luck. youll love the flows!

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05 MG ATO[MUSTANG dash sig][blk tail lght trim][18" foose whels w/ 255 ventus][GT takeofs][Xcal 91 tune][JBA sprk plgs][K&N filtr]+ 86 5spd gt hatch!

quote:

MY CAR IS DENTPRONE

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RE: retune speedometer with xcal2?? - 7/18/2006 8:12:18 PM

scrming

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It's actually revolutions per mile. you want to set your to 785 or as close as possible...

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RE: retune speedometer with xcal2?? - 7/18/2006 8:14:57 PM

jittie

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From: Florida
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quote:

ORIGINAL: scrming

It's actually revolutions per mile. you want to set your to 785 or as close as possible...

do i have to return the tune to stock then go back and retune with the new tire info, or can i just add the revolution per mile info?

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RE: retune speedometer with xcal2?? - 7/18/2006 8:17:46 PM

scrming

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quote:

ORIGINAL: jittie

quote:

ORIGINAL: scrming

It's actually revolutions per mile. you want to set your to 785 or as close as possible...

do i have to return the tune to stock then go back and retune with the new tire info, or can i just add the revolution per mile info?

No need to go back to stock... Just reload Lidio's tune and go into the change parameters...

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RE: retune speedometer with xcal2?? - 7/18/2006 8:32:29 PM

SPARTAN VI

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Very good information here. Someone add this to the FAQ!

Switching to 255s soon and this has been very helpful!

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RE: retune speedometer with xcal2?? - 7/18/2006 8:49:19 PM

jittie

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thanks scrming, i just went for a test drive after resetting to 785, it feels spot on now! i hope all this wasn't in my head, but at least now when the speedometer says 80 it feels like i'm going 80...

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RE: retune speedometer with xcal2?? - 7/18/2006 10:00:03 PM

scrming

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quote:

ORIGINAL: jittie

thanks scrming, i just went for a test drive after resetting to 785, it feels spot on now! i hope all this wasn't in my head, but at least now when the speedometer says 80 it feels like i'm going 80...

Cool!

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RE: retune speedometer with xcal2?? - 7/18/2006 10:15:37 PM

sonicblue05

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if you go 255/45/18 no need to change the speedo Spartan!

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RE: retune speedometer with xcal2?? - 7/18/2006 10:17:34 PM

jittie

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From: Florida
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yeah i wish my wheels had come with 245/45 instead of 245/40, would help to fill in the wheelwells a little and i wouldn't have been second guessing my speedo for the last 2 weeks!

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RE: retune speedometer with xcal2?? - 7/30/2006 1:25:30 PM

Nice Pony

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If your have stock V6 gears, 0.72:1 fifth and 3.31:1 deferential, with your 245/40/18s you should be at 2500RPM @ 80MPH in fifth gear.

Here is a link to a speed calculator.

http://pw1.netcom.com/~sgalaba/mph.htm

Here are all the stock gear ratios.

V6
1st 3.75:1
2nd 2.19:1
3rd 1.41:1
4th 1.00:1
5th 0.72:1
Deferential 3.31:1

GT
1st 3.38:1
2nd 2.00:1
3rd 1.32:1
4th 1.00:1
5th 0.68:1
Deferential 3.55:1

Interesting thing here is that the total final drive ratio for the V6 and GT are almost identical speed wise.

I noticed the other day the my friends ricer was doing 55MPH @3000RPM in fifth. My V6 Pony is doing 100MPH @3000RPM in fifth!!

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RE: retune speedometer with xcal2?? - 7/30/2006 4:25:30 PM

Puerto Rico 4.6

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Right 785 tire rev per mile.

< Message edited by Puerto Rico 4.6 -- 7/30/2006 4:32:58 PM >

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