How high can u safely rev a stock shortblock with a h/c/i?

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

41

Indianapolis, IN

Oct 6, 2004

#1

• Oct 6, 2004

• #1

Whats up guys? I was wondering how high the stock shortblock can be revved to safely without causing damage or asking for it to explode. I know our rev limiters are at 6250(i never hit it, just what i read) but aren't cobras higher?


Anyway, just wondering.

 

M

mackey

Active Member

Jan 25, 2003

1,284

1

38

40

Beverly, Massachusetts

Oct 6, 2004

#2

• Oct 6, 2004

• #2

I've gone probably gone over 6k (stock tach). Each time i blew my alternator.

 

stang976

New Member

Apr 13, 2004

853

0

0

43

Westchester, NY

www.cardomain.com

Oct 6, 2004

#3

• Oct 6, 2004

• #3

yea it is sstupid to go past 6k on a stock block.

 

M

mackey

Active Member

Jan 25, 2003

1,284

1

38

40

Beverly, Massachusetts

Oct 6, 2004

#4

• Oct 6, 2004

• #4

It was an accident, I missed 3rd gear :-(

 

go-stang5.0

New Member

Jan 27, 2003

2,244

0

0

42

Glenview,Il

Oct 6, 2004

#5

• Oct 6, 2004

• #5

Blowing the alternator? Thats really odd. I rev my motor to almost 6500 rpms and I ahve never blown an alternator. Depending on your h/c/i you may be making peak power around there...I wouldent worry too much about the shortblock as long as its in good shape. Anyways with the rev limiter you cant spin it up high enough to get into trouble. If you remove that (with, a chip, etc.) then I'd be careful. Honestly on my 306, the valvetrain went before the shortblock went and that was with a stock crank and rods.

 

Joes95GT

New Member

Jan 23, 2003

3,132

1

0

Delaware

Oct 6, 2004

#6

• Oct 6, 2004

• #6

stang976 said:

yea it is sstupid to go past 6k on a stock block.

Click to expand...

Stupid in what sense?

I shift at about 6500 and it'll go up to about 6600 in between the 1-2 shift. Is it safe? Hell, I don't know. I've made it home each time I've done it. It can't be too dangerous.

Joe

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

41

Indianapolis, IN

Oct 6, 2004

#7

• Oct 6, 2004

• #7

Joes95GT said:

Stupid in what sense?

I shift at about 6500 and it'll go up to about 6600 in between the 1-2 shift. Is it safe? Hell, I don't know. I've made it home each time I've done it. It can't be too dangerous.

Joe

Click to expand...

How many times have u done it? Its good to see someone saying that u cant go to the factory rev limiter. Where do cobras have their limiter at?

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

6

99

Arkansas

Oct 6, 2004

#8

• Oct 6, 2004

• #8

nmcgrawj said:

Where do cobras have their limiter at?

Click to expand...

I'm not for sure on a Sn95 Cobra...I would assume it is at the same rev-limiter setting as the Gt model...even with it's gt40's, 1.7 RR's, etc...

The 96+ Cobras (DOHC) 4.6L rev upwards of 7k before redline...different motor obviously...

 

T

TMC

Founding Member

Jan 17, 1999

1,426

0

36

Chicago

Oct 6, 2004

#9

• Oct 6, 2004

• #9

nmcgrawj said:

How many times have u done it? Its good to see someone saying that u cant go to the factory rev limiter. Where do cobras have their limiter at?

Click to expand...

Back when I was taking my car to open track road race events I would spin it well past 6K constantly with the stock shortblock. I shift the car at 6400 and would often over rev intentionally to avoid a mid corner shift. I would go 67-6800 very often.

And if you check around you'll find that SOME 94/95 GT's have a 7k rev limiter.

 

Killercanary

The car that set the bar.

Founding Member

Nov 29, 1999

5,676

1

76

Altoona, PA

www.angelfire.com

Oct 6, 2004

#10

• Oct 6, 2004

• #10

Guys, for the thousandth time, the T4MO rev limiter is 7000rpms, not 6250 like every other stang.

 

95WhiteVenom

Founding Member

Oct 27, 2002

624

0

16

43

Alabama

Oct 6, 2004

#11

• Oct 6, 2004

• #11

T4MO rev limiter,...what is that?

 

95WhiteVenom

Founding Member

Oct 27, 2002

624

0

16

43

Alabama

Oct 6, 2004

#12

• Oct 6, 2004

• #12

T4MO rev limiter,...what is that?

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

41

Indianapolis, IN

Oct 6, 2004

#13

• Oct 6, 2004

• #13

That would be the 94-95 Vert. GT 5-speed computer program from Tweecers website.

 

Killercanary

The car that set the bar.

Founding Member

Nov 29, 1999

5,676

1

76

Altoona, PA

www.angelfire.com

Oct 6, 2004

#14

• Oct 6, 2004

• #14

Its in the coupes as well to the best of my knowledge.

 

1994Vib.RedGT

Member

Aug 19, 2004

585

0

16

Denver, CO

Oct 6, 2004

#15

• Oct 6, 2004

• #15

my coupe has the T4MO computer

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

4

78

Summerville,SC missing South Fl. weather :(

Oct 6, 2004

#16

• Oct 6, 2004

• #16

Fordfuelinjection.com has the T4M0 for manuals and U4P0 for auto's

 

Killercanary

The car that set the bar.

Founding Member

Nov 29, 1999

5,676

1

76

Altoona, PA

www.angelfire.com

Oct 6, 2004

#17

• Oct 6, 2004

• #17

wytstang said:

Fordfuelinjection.com has the T4M0 for manuals and U4P0 for auto's

Click to expand...

That is correct.

 

Joes95GT

New Member

Jan 23, 2003

3,132

1

0

Delaware

Oct 6, 2004

#18

• Oct 6, 2004

• #18

Killercanary said:

Guys, for the thousandth time, the T4MO rev limiter is 7000rpms, not 6250 like every other stang.

Click to expand...

With that said, Ford would not have made the limiter so far out of the useable power range of the stock motor unless they knew that the rod bolts, main caps, bearings, and all other fastners were up to the job.

Of course now, 10 years later, the fastners have fatigued and the bearings have worn (hopefully, just slightly). To what extent, I haven't a clue. However, I would not and do not hesitate to spin the motor to 6500-6700. Would I spin the motor to 6700 with a 200 shot? Absolutely not. It's all in moderation.

Joe

 

95WhiteVenom

Founding Member

Oct 27, 2002

624

0

16

43

Alabama

Oct 6, 2004

#19

• Oct 6, 2004

• #19

humm,... missed third before seen the tach bounce off the dash guess the dash was my rev-limiter. lol

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

41

Indianapolis, IN

Oct 6, 2004

#20

• Oct 6, 2004

• #20

I was just going off of Tweecer's download section on their website....