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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

RPM @ 70 mph with 3.73's

  • Thread starter Thread starter bonestock87
  • Start date Start date Nov 26, 2005

bonestock87

Founding Member
Dec 19, 2001
732
12
38
Cape Coral, FL
Nov 26, 2005
#1
  • Nov 26, 2005
  • #1
I don't drive my 'stang very often, but when I just can't hold out any longer and must partake of the joy that is Mustang ownership, it's to work and back. It's a 70 mile round trip with 30% stop and go and 70% highway. I noticed tonight that it was turning about 1,800 @ 70mph (with stock 3.27's) and made me think, "wonder what it would be turning with 3.73's out back"? I'm thinking about 2 things here. 1) Will my gas mileage suffer very much and 2) will the engine be at an rpm @ 70 mph that will drone in my ear much like my '93 GT with flowmasters did.

I'm sure it's been covered and a thorough search would net me my answer, but crap on that, I'm trying to do this AND watch the Georgia/Georgia Tech game.

Oh, I have a 5-speed if you didn't notice it in my sig. Thanks!
 

98blackmagic

New Member
Jun 2, 2005
386
0
0
wouldnt you like to know
Nov 26, 2005
#2
  • Nov 26, 2005
  • #2
Ive never paid attention to my rpm's and I have a auto and 4:10's I dont think gas milage will be a problem for you. The exhaust shouldnt be bad either, unless you have a off road and SLP exhaust. Oh yea whos leading in the game, I havent seen a TV since lunch today, damn computer.
 
R

registered

New Member
Oct 2, 2005
15
0
0
Nov 26, 2005
#3
  • Nov 26, 2005
  • #3
check this:
http://www.tchracing.com/tech/gearcalc
 

bonestock87

Founding Member
Dec 19, 2001
732
12
38
Cape Coral, FL
Nov 26, 2005
#4
  • Nov 26, 2005
  • #4
It's tied 7-7 with about 6 minutes remaining in the 4th. I'm for GT since the dogs beat our a$$es again this year, but then again who didn't beat us. (UT Vols that is )

Make that 14-7 with Georgia on top.

Well now, thanks registered, that's about the neatest thing I've seen today. Thanks!!
 

bonestock87

Founding Member
Dec 19, 2001
732
12
38
Cape Coral, FL
Nov 26, 2005
#5
  • Nov 26, 2005
  • #5
Hmmmm.......only 2,329 rpm's at 70mph with 4.10's. Interesting........
 

03MGT

New Member
May 30, 2005
199
0
0
Nov 26, 2005
#6
  • Nov 26, 2005
  • #6
registered said:
check this:
http://www.tchracing.com/tech/gearcalc
Click to expand...
I love you for posting that it answered all my RPM and MPH questions about differnt gears.
 
F

FalconGuy016

New Member
Oct 26, 2004
437
1
0
Northern VA
Nov 26, 2005
#7
  • Nov 26, 2005
  • #7
That tool is essential. I used that very calculator to defend myself in court.
 
0

'03GTinFLA

Member
May 29, 2004
486
0
17
St. Petersburg, FL
Nov 27, 2005
#8
  • Nov 27, 2005
  • #8
I have 3.73's with LT's O/R prochamber and flowpaths and I drive 2 hr round trip every day. My advice would be to do the gears. I didn't notice any mpg difference, maybe my setup doesn't drone but nothing in the exhaust dept bother's me on the trip. I usually cruise between 80 and 90 mph, with no problems.
Get the gears.
 

Pearl02

Member
Nov 27, 2004
496
0
16
Kansas City
Nov 27, 2005
#9
  • Nov 27, 2005
  • #9
I also have 3.73's. I have a Magnaflow catback. At 70mph the engine is tacking less than 2200 rpm's. However, I did loose about 2.5 mile per gallon. Some of that could be in my X-cal tune. I don't have any drone with my set up. Pearl02.
 
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