5th gear

Larger diameter tire. 205/60/15 on stock wheels or a 205/55/16 on 16" wheels. Adds abuot 5%-ish to the od of the tire. This DOES make the speedo read 5% too slow, but if you can do a little math in your head you can always be right on. Any bigger (had 205/60/16 for a week) and you're affecting the final drive too much in the wrong direction.

You'd have to disassemble both trans and HOPE it was made the same internally. Just because a company makes trans for multiple car makers does NOT make them interchangeable.

Again. . . buy a larger OD tire and be done.

Outside Diameter. . . taller tire. Bigger than the 195/60's on the car.

thedrumm said:

It looks like OD tires for me. I figured I would not be able to find a taller 5th gear, but it was worth a try. I drive all most all interstate, so I was looking for better gas mileage in any way I could get it. Especially since I am keeping this until it dies, which hopefully will be 12 more years.

Thanks for the input!

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I have the same type of drive. I65, 865, 465 to keystone and two stoplights later I'm at work. That's why I went with teh 205/55's instead of the "correct height" 205/50 16's long ago. I keep in mind that an indicated 65 is closer to 70 ground speed and back off a little and get (got, having new issues)great gas mileage on my non-CVVT Beta.

Stocker said:

LOL of course they can be unique, why not?

It was a huge hinderance in WWI when we had trucks from, what, 150 manufacturers? Spare parts logistics was a nightmare because they don't HAVE to be the same without a standard.

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While that's intersting info and stuff, it has no relevance here. Hyundai used a different wiring harness for GLS, GT, Limited, auto and manuals. . .A different wiring harness for each model and type. That's a sure sign of stupidity on their part. What about SPIII fluids only?

Go to a taller tire and be done.

Been running 4% larger tires for 5 years. No one has thought the car looked goofy yet.

Tommy said:

But its not really doing you any good for this purpose.

Id rather have an accurate speedo anyways.

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Really? And what do you base your theory on? I run slower than indicated than I am actually traveling. That means lower engine rpms. Lower engine rpms at speed means less fuel wasted. I can run 70mph indicated and stay with traffic. When I ran the 'kooks which were 1% smaller than oem I had to run 75mph indicated to keep up with traffic. 75mph=3200rpms for me. 70mph -2900/3000rpms.

Tommy said:

195/60/15 tires and stock trans = 70mph is calculated to 2980rpm
205/55/16 tires and stock trans = 70mph is calculated to 2900rpm

2.7% difference. not much to write home about guys.

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Actual measurements of the tires puts it a 3.8% as each tire is a little different in it's actual physical dimensions. But hey, you're right. What could I POSSIBLY know about ANYTHING. You, sir, must be God.

ALSO. . . keep in mind you can go TOO far. When I had the 206/60's for 2 weeks, my mileage actually dropped a little because the engine was lugging too much up hills at highway speeds. It's a fine balance that can quickly be pushed too far.

I stand by my opinion on leaving the trans the F alone.

2 tanks(AND A HALF), and 205/60/16's measured out to almost 7% difference in overall height. And yes, changing the final drive almost 7% does make a difference. The steeper hills almost needed a downshift at 65.

We ran a full tank out by the time we got it home the first day. Ran 2 more full tanks and a half tank.