FRS stock top speed

[-Willis-86touge]

So did another high speed test this week let's just say it's bad! First off I changed rims and tires, still na. I got a cheap set of rims that weigh a lot but I figured it make it look better and I could test a fitment that I wanted with out spending 2000 and being disappointed. So for tires I went with a meaty tire a 245/40-18 instead of a 225/40-18 yea I know crazy right. So first few days there was rubbing because I hadn't got a alignment. After the alignment no rubbing unless I hit a big bump going to fast or let's say the was a steep inlince like a drive way. So all good there. ... so. The test run I was expecting to hit 160 165 because the bigger tires in effect lower final drive ratio. So yes it's a bit slower driving around town but it's smoother too! Well I end up hitting 137�� Wtf! Any thoughts. It's either the heavy rims or the cars power level doesn't have enough with the new final drive to push faster. I think that their is it not enough power now. Really sucks I guess il have to go back to a normal tire size and see what happens!

[Yanbags]

Originally Posted by -Willis-86touge

So did another high speed test this week let's just say it's bad! First off I changed rims and tires, still na. I got a cheap set of rims that weigh a lot but I figured it make it look better and I could test a fitment that I wanted with out spending 2000 and being disappointed. So for tires I went with a meaty tire a 245/40-18 instead of a 225/40-18 yea I know crazy right. So first few days there was rubbing because I hadn't got a alignment. After the alignment no rubbing unless I hit a big bump going to fast or let's say the was a steep inlince like a drive way. So all good there. ... so. The test run I was expecting to hit 160 165 because the bigger tires in effect lower final drive ratio. So yes it's a bit slower driving around town but it's smoother too! Well I end up hitting 137�� Wtf! Any thoughts. It's either the heavy rims or the cars power level doesn't have enough with the new final drive to push faster. I think that their is it not enough power now. Really sucks I guess il have to go back to a normal tire size and see what happens!

This car has 200hp lol, what are you expecting? You won't get much higher than that.

[-Willis-86touge]

Originally Posted by Yanbags

This car has 200hp lol, what are you expecting? You won't get much higher than that.

Well I hit 155 before.

[Somerandom18]

Originally Posted by -Willis-86touge

So did another high speed test this week let's just say it's bad! First off I changed rims and tires, still na. I got a cheap set of rims that weigh a lot but I figured it make it look better and I could test a fitment that I wanted with out spending 2000 and being disappointed. So for tires I went with a meaty tire a 245/40-18 instead of a 225/40-18 yea I know crazy right. So first few days there was rubbing because I hadn't got a alignment. After the alignment no rubbing unless I hit a big bump going to fast or let's say the was a steep inlince like a drive way. So all good there. ... so. The test run I was expecting to hit 160 165 because the bigger tires in effect lower final drive ratio. So yes it's a bit slower driving around town but it's smoother too! Well I end up hitting 137�� Wtf! Any thoughts. It's either the heavy rims or the cars power level doesn't have enough with the new final drive to push faster. I think that their is it not enough power now. Really sucks I guess il have to go back to a normal tire size and see what happens!

Crazy, I've hit 150 only with different tires..

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[nikitopo]

Many times in the range of 140-145 mph.

[Yanbags]

Originally Posted by -Willis-86touge

Well I hit 155 before.

Wow, beats me then.

[-Willis-86touge]

Originally Posted by Somerandom18

Crazy, I've hit 150 only with different tires..

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What size cause the 245/40-18 that I put on are almost an in bigger.

[Somerandom18]

Originally Posted by -Willis-86touge

What size cause the 245/40-18 that I put on are almost an in bigger.

Stock size just sticker compound so probably wouldn't make a difference as far as top speed goes.

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[paulca]

When you changed the tyre size did you recalibrate the speedo or are your driving with a broken one?

Don't know about over there but insurance companies here will invalidate your insurance if you change the size of your wheels (rolling circumference) unless you can prove you re-calibrated the speedo. Not to mention the police might be interested.

If you fit larger circumference wheels the speedo under reads. Fit smaller ones and it over reads. By default on stock wheels the speedo under reads by about 10%.

[humfrz]

A fun piece of math and physics for you top speed masters.

According to the attached formula, what would be the theoretical top speed of a stock, 2013 FR-S with a manual transmission..??

Note ..... be sure to use estimated wheel horsepower.


humfrz

[-Willis-86touge]

Originally Posted by humfrz

A fun piece of math and physics for you top speed masters.

According to the attached formula, what would be the theoretical top speed of a stock, 2013 FR-S with a manual transmission..??

Note ..... be sure to use estimated wheel horsepower.


humfrz

Stock at 7500 rpm with stock tires is 175
With 245/40-18 @ 7500 rpm math works out to 184
Sorry to say I didn't use your formula humfrz just used a basic program that figures tire size and gearing.

[-Willis-86touge]

Originally Posted by paulca

When you changed the tyre size did you recalibrate the speedo or are your driving with a broken one?

Don't know about over there but insurance companies here will invalidate your insurance if you change the size of your wheels (rolling circumference) unless you can prove you re-calibrated the speedo. Not to mention the police might be interested.

If you fit larger circumference wheels the speedo under reads. Fit smaller ones and it over reads. By default on stock wheels the speedo under reads by about 10%.

No I didnt recalibrate yet the speedo showed 133 did the math and works out to 137 with the 245/40-18 tires but when I did 155 it was completely stock; speedo read right

[humfrz]

Originally Posted by -Willis-86touge

Stock at 7500 rpm with stock tires is 175
With 245/40-18 @ 7500 rpm math works out to 184
Sorry to say I didn't use your formula humfrz just used a basic program that figures tire size and gearing.

Well now, Willis-86touge, that basic "gear limited" program is just fine ...... but it doesn't factor in the air that the car has to push out of the way .....

Down here on earth, pushing air out of the way is a big factor, especially at higher speeds........



humfrz

[brz11b]

Got to about 120mph, took me about 37 minutes. there was more room but I was running out of road and patients waiting.