I am thinking about getting custom gauges that are made to order. My speedometer goes to 150mph right now but I am thinking about getting gauges that go higher, could I just use SCT to reclaibrate it or do I have to take it to a dealer. I have a 2002 Mustang GT. Thank-you.

 

Speedhut has custom made to order gauges. But I must say, why do you need anything on your dash speedo other than the factory 150? Unless you open track your car and have ungodly power you will never see anything higher than 150..unless you take time to do it on the street. And no your tuner can not tune for that.

The best gauges IMO are mach gauges..those things are sick

FTW

 

i agree..those are super nice

when my buddy topped his 04 gt out in germany, we just used my gps to see how fast we were actually going. got 165 km/h out of it, about 165ish. took forever though

 

If you do have the power to need it to go past 150mph plus, the best thing i can think of is Racepak Digital Guages. It groups ALL of the information you could want in one place, and goes as fast as you can go.

Otherwise, just get one out of a cobra or something, I think they go higher than 150mph. Not sure though

EDIT: oh, and BTW, your speedometer is going to be VERY inaccurate, like 10+mph off depending on whether or not you have the stock tires on there at that speed

 

^when my friend's car was readin 150, the gps was saying we were going 152. not too horribly inaccurate. unless you meant if he swaps in cobra gauges, it will be way off.

 

depends on the car. Some people don't correct their tunes after swapping to even just a wider rear wheel/tire combo


For instance, if you were running a 315, as opposed to the stock 245's, and never corrected the tune, you'd be about 6% off, which is about 12mph.

I betcha there are a ton of people who don't actually correct the tune, especially if just switching to wider rears or something.

 

well, according to this calcultor i have from my Miata days, the tire sizes are as follows:

245/45/17 (stock) = 25.7"
275/40/17 = 25.7"
315/35/17 = 25.7"

of course this will vary from tire to tire, some 245/45's are slightly taller than others by different brand. but in my experiences it is minimal (less than .20" tolerance)

here is the link to the calculator: http://www.miata.net/garage/tirecalc.html


I really like those gauges from the seond post though...easily the nicest stock gauges

 

Can you explain that? It just doesn't make sense to me, because the O.D. is the exact same for a 245/45 and a 315/35. If the O.D. was different then it would be thrown off due to the tire making more/less revolutions. I just don't understand how the width would make a difference.

I'm not trying to pull a BS flag here, just wondering.

 

agreed. thats should not make a difference at all. only if they were taller, not wider would change your speedo. when i switched out my rims, they came with tires for a S197 on them, but was uninformed.... and didn't have time to switch them before the river trip.... i was wondering why people were driving so slow

 

It has to do with the drag created by a wider tire if im not mistaken.