People with 3.73's

66 Tiger

New Member

Jul 13, 2003

249

0

0

Virginia

May 19, 2004

#1

• May 19, 2004

• #1

Just wanted to see what kind of speed vrs. rpm your getting in 5th?

Example: 80mph = ____ rpm
70mph = ____ rpm
60mph = ____ rpm

Also, I think that this will be more accurate if your car is a 5 spd & has 17" wheels.

The reason I'm asking... With the complete lack of traction that I am experiencing, not to mention the fuel consumption anytime I get near an interstate, I'm starting to doubt wheather or not I actually have 3.73's.

Thanks...

 

Legendary

Founding Member

Oct 10, 2002

1,925

0

0

City of Angels

May 19, 2004

#2

• May 19, 2004

• #2

I'm at 2000 rpms when I'm around 60mph. My tire size is 225 60 r15

 

mustang88GT

New Member

Jun 1, 2003

186

0

0

Charlotte, North Carolina

May 19, 2004

#3

• May 19, 2004

• #3

i ahve 3.73s and 17s...
3rd tops out at 78 as i pass through teh 1/8
4th gear tops out at bout 95 as i pass through the 1/4

5th gear
65 is 2000
70 is pushin 2200
80 is bout 2500
90 is lil under 3k

 

NotoriousGT350

Founding Member

Apr 3, 2001

891

0

17

Lubbock, TX

May 19, 2004

#4

• May 19, 2004

• #4

That's where I'm at with 245/50/16s, 60mph@ 2000rpm. My speedo seems to be off 11-12mph, so I think I'm going 70mph @ 2350rpms.

 

mustang88GT

New Member

Jun 1, 2003

186

0

0

Charlotte, North Carolina

May 19, 2004

#5

• May 19, 2004

• #5

^ why dont u change the speedo gear it is so easy... only like 5 bucks max too

 

8

87'GTstang

New Member

Feb 16, 2004

1,025

0

0

May 19, 2004

#6

• May 19, 2004

• #6

mustang88GT said:

i ahve 3.73s and 17s...
3rd tops out at 78 as i pass through teh 1/8
4th gear tops out at bout 95 as i pass through the 1/4

5th gear
65 is 2000
70 is pushin 2200
80 is bout 2500
90 is lil under 3k

Click to expand...

Man that's quite a difference, I only pull 1600 at 65 with 3.08's...........

 

drgn5.0

Founding Member

Mar 13, 2001

603

0

0

May 19, 2004

#7

• May 19, 2004

• #7

http://www.bullittarchive.com/Misc/Gears/

 

D

DropTopR

New Member

Mar 25, 2004

175

0

0

Warsaw IN

May 19, 2004

#8

• May 19, 2004

• #8

I pul 1500 at 60, and 2000 at 80, but my car has an extra gear.

 

mustang88GT

New Member

Jun 1, 2003

186

0

0

Charlotte, North Carolina

May 19, 2004

#9

• May 19, 2004

• #9

87'GTstang said:

Man that's quite a difference, I only pull 1600 at 65 with 3.08's...........

Click to expand...

ur tellin me.. i went from 2.73s, it was a dog out of the hole... but could cruise nice

 

CobraWannabe

Member

Jul 16, 2003

321

0

17

Lancaster, PA

May 20, 2004

#10

• May 20, 2004

• #10

86QtrHorse said:

I'm starting to doubt wheather or not I actually have 3.73's.

Thanks...

Click to expand...

All you gotta do is jack the rear of the car up, and have someone rotate the wheels 1 complete turn and count how many times the driveshaft turns. For example, if the DS turns 3 and a half (3.5) turns, then it has 3.55's. If it turns 3 and a quarter (3.75)turns, its has 3.73's. If it goes slightly past 4 turns, it has 4.10's. Hope this helps.

And BTW, which tranny gear is the one to use with my 3.73's? Someone above mentioned it. I know my speedo is off.

 

66 Tiger

New Member

Jul 13, 2003

249

0

0

Virginia

May 20, 2004

#11

• May 20, 2004

• #11

CobraWannabe said:

All you gotta do is jack the rear of the car up, and have someone rotate the wheels 1 complete turn and count how many times the driveshaft turns. For example, if the DS turns 3 and a half (3.5) turns, then it has 3.55's. If it turns 3 and a quarter (3.75)turns, its has 3.73's. If it goes slightly past 4 turns, it has 4.10's. Hope this helps.

Click to expand...

Thanks CobraWannabe, & everyone else too! That's exactly what I'm gona do this morning when I get to my shop. That way there will be no question what so ever.

 

9

90Notch

Founding Member

Jan 31, 2002

1,046

0

0

Westwood, MA & yes it's killing me that I'm no

May 20, 2004

#12

• May 20, 2004

• #12

Don't fear the gear! My 3.73's with 225/60-15's turn less rpm at 70 or 80 mph than my wifes stock Acura TL, just some food for thought. In all honesty I wish 3.90s were available when I got my 3.73s I went with them for my daily driver.

 

mustang88GT

New Member

Jun 1, 2003

186

0

0

Charlotte, North Carolina

May 20, 2004

#13

• May 20, 2004

• #13

^ but look those acura motor are ment to be wound up like taht ... my buddies beater prelude runs at bout 3500 rpms at 70 in fifth...

 

ninety15.0

New Member

Mar 10, 2004

1,336

0

0

May 20, 2004

#14

• May 20, 2004

• #14

I think with stock size tire diameter and 3.73's its like exactly 30mph for every 1000 rpm. that means at 2000 rpm you are going 60mph and 3000 rpm is 90 mph and so on. test it out and you will see its very close and if its off at all its because your speedo is off. Go to a gear/rpm calculator and check it out! good luck and dont fear the gear!

 

8

87'GTstang

New Member

Feb 16, 2004

1,025

0

0

May 20, 2004

#15

• May 20, 2004

• #15

mustang88GT said:

^ but look those acura motor are ment to be wound up like taht ... my buddies beater prelude runs at bout 3500 rpms at 70 in fifth...

Click to expand...

Yep, that's why I think american muscle is great, what we can do in like 3rd gear is what rice is capable in 1st
It's nice to be able to cruise at around 2k or less on the interstate instead of "screaming" along at 3500 or so rpm.