Top Speed in 4th Gear

[Fuzz420]

I was under the assumption that it was around 105mph.Last night i did 110, with a little more room to go.For reference i have 4:30 gear,w-58, and stock wheels and tires.I was going to take it to the limiter but surroundings werent permiting.

Any insight is appreciated

 

[suprahero]

110 in fourth with a 4.30 rearend is insane. Seems like you would be turning about 8000rpm. I could see it with the 373 gears. How many rpm were you turning?....................lol

 

[Fuzz420]

110 in fourth with a 4.30 rearend is insane. Seems like you would be turning about 8000rpm. I could see it with the 373 gears. How many rpm were you turning?....................lol

I believe i was around 5900 maybe 6k, but it was nowhere in the red yet

 

[s383mmber1]

I generally dont look down at that speed, nor do i usually go that speed.

But-

I can go well over 100 in fourth with room to go.

I have a NA w58 with 4.3 LSD

 

[Big Wang Bandit]

Yup. Around 110.

 

[Fuzz420]

I generally dont look down at that speed, nor do i usually go that speed.

But-

I can go well over 100 in fourth with room to go.

I have a NA w58 with 4.3 LSD

I generally dont either but i had a challenger arise, so i sped up to catch up to him, did a quick speed check seen i was going a 110, and decided not to jump lanes to follow him around some semi's and slowed back down.

Yup. Around 110.

is this with an pre 89 ecu or 89+.

 

[Big Wang Bandit]

pre 89

 

[inline6]

I have a 4.30 rear end on my 1j and I can get to 90 in 3rd so I know 4th is good for well over 100. I have a r154 but I believe 4th gear is 1:1 for both tranny's so it doesnt matter. 110 you are gettin close to the top of 4th tho. Search online for a calculator and it will give you MPH ratings for each gear based on diff, tire height, gear, and RPM.

 

[Fuzz420]

pre 89

Im 89+

I have a 4.30 rear end on my 1j and I can get to 90 in 3rd so I know 4th is good for well over 100. I have a r154 but I believe 4th gear is 1:1 for both tranny's so it doesnt matter. 110 you are gettin close to the top of 4th tho. Search online for a calculator and it will give you MPH ratings for each gear based on diff, tire height, gear, and RPM.

My 7mge will do 90 in 3rd,around 93-5ish the limiter kicks on. Ill try and find one of those caculators and see what it has to say.

 

[GotToyota?]

I did a pull the other night in 4th, punched it, was at around 100 by 5kish. I'm sure it still had some room to go, I could see it hitting 110. BTW this was with a 4.3 rear end with a W58.

-Matt

 

[Nick M]

Speedo's are built optimistic. 6000 RPM in 4th with stock tire diameter and 4.30 rear is 102.57 mph.

5th is 131 at 6000 RPM.

 

[cjsupra90]

Your speedo is off. reading fast.

4.30 rear, W58 trans, stock 225/50/16 tires.
RPM = MPH
5000 = 85.9
5500 = 94.5
6000 = 103.1
6500 = 111.7

The equasion is (tire circumfrance X eng. RPM)/(1056 X trans ratio X axle ratio) = MPH

 

[Fuzz420]

Good ol optmistic speedo :bigthumb:

 

[s383mmber1]

ive got bigger wheels! :icon_bigg

 

[89supturbo]

supras came w/ 373's, they can go mugh higher than that on stock gearing

 

[s383mmber1]

supras came w/ 373's, they can go mugh higher than that on stock gearing

Certain supras came with 3.73.

My supra, and many N/A's came with a sport package which includes a 4.3 limites slip differential.

 

[87CandyBlueT]

87T 3.73 rear not sure of my top speeds but i'm sure I can go well over 110 in 4th. I can cruise 80mph @ 3k rpm in 5th

 

[Fuzz420]

87T 3.73 rear not sure of my top speeds but i'm sure I can go well over 110 in 4th. I can cruise 80mph @ 3k rpm in 5th

80mph cruise for me is around 3400 rpms