I need more speed!

JPstealth

Member

Nov 21, 2007

34

0

7

Nothern NJ

Dec 20, 2009

#1

• Dec 20, 2009

• #1

So my car, for whatever reason, stops at 104mph which actually measures 109 on my GPS but none the less it wont less me pass it.. feels like a limiter. I got tons of power left and it suddenly just feels like my power stops??

I have a predator and try to turn it off but won't let me. I switch both settings to off on the tuner but when I plug it back on in it still reads on?? Am i doing something wrong? All my other settings on it work fine though.

 

tag4car

Member

Nov 21, 2005

0

0

16

Birmingham AL

Dec 20, 2009

#2

• Dec 20, 2009

• #2

i don't remember what the numbers were on my predator, try setting it to the highest number instead of turning the limiter off

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

95

134

Dec 21, 2009

#3

• Dec 21, 2009

• #3

The 4.10s are limiting your top miles per hour because they are making the engine spin faster to achieve a given speed.

What RPM is the engine turning at when you hit the wall on speed?

 

Stark77

Member

Jun 11, 2008

501

0

16

Tallahassee, FL

Dec 21, 2009

#4

• Dec 21, 2009

• #4

My car is an automatic and I noticed this problem after I got my 3.73's installed. Took it out to the track and ran it with OVERDRIVE off, and as soon as I hit 100mph - righ on the buzzer - the car would maintain speed but not go any faster. Next run I turned O/D off and I broke through 100 no problem. Next run, turned O/D back on to test the problem and it hit the 100mph wall. If you have an automatic try this. If not, then you're screwed.

 

JPstealth

Member

Nov 21, 2007

34

0

7

Nothern NJ

Dec 21, 2009

#5

• Dec 21, 2009

• #5

Kilgore Trout said:

The 4.10s are limiting your top miles per hour because they are making the engine spin faster to achieve a given speed.

What RPM is the engine turning at when you hit the wall on speed?

Click to expand...

Well since its crazy snowy here it is difficult to try it out but if I remember correctly it's close to the end of 4th maybe around 5-5500rpms and in 5th around 4k

 

ChillPhatCat

20+ Year Stangneter

Apr 22, 2002

409

65

48

Syracuse, NY

Dec 21, 2009

#6

• Dec 21, 2009

• #6

JPstealth said:

Well since its crazy snowy here it is difficult to try it out but if I remember correctly it's close to the end of 4th maybe around 5-5500rpms and in 5th around 4k

Click to expand...

I agree wiht Kilgore, it could very well be the gears topping you out. My car will easily pass that speed in 5th.

 

SaleenGT2001

Well-Known Member

Jul 18, 2005

2,811

4

58

Four Oaks NC

Dec 21, 2009

#7

• Dec 21, 2009

• #7

even in 4th gear with a manual it is only 5500 rpm. it should pull well past that. what size tires and rims came on your car stock??

 

JPstealth

Member

Nov 21, 2007

34

0

7

Nothern NJ

Dec 21, 2009

#8

• Dec 21, 2009

• #8

SaleenGT2001 said:

even in 4th gear with a manual it is only 5500 rpm. it should pull well past that. what size tires and rims came on your car stock??

Click to expand...

I have stock GT 17inchers.. 255/45 i do believe.. yea it doesn't feel like I'm running out of gear.. sounds more like the fuel just cuts or something.

 

tag4car

Member

Nov 21, 2005

0

0

16

Birmingham AL

Dec 21, 2009

#9

• Dec 21, 2009

• #9

Stan Weiss' - Automotive Performance Software / Interactive JavaScript to Calculate Speed(MPH) for given RPM, Rear Gear Ratio and Trans Gear Ratio

tires should be around 25.67 dia

if it's a t45 the 5th gear ratio is 0.67, 0.62 for t3650

 

tag4car

Member

Nov 21, 2005

0

0

16

Birmingham AL

Dec 21, 2009

#10

• Dec 21, 2009

• #10

SaleenGT2001 said:

even in 4th gear with a manual it is only 5500 rpm. it should pull well past that. what size tires and rims came on your car stock??

Click to expand...

1:1 comes out at 102.486mph using 4:10's at 5500rpm

 

2

2002BLGT

Well-Known Member

Dec 18, 2003

2,945

4

59

Bedford VA

Dec 22, 2009

#11

• Dec 22, 2009

• #11

get a custom tune from a Diablo CMR dealer

 

COramprat

...I can take it. I think.

20+ Year Stangneter

Mar 2, 2003

8,474

1,463

223

Sea of Tranquility

Dec 23, 2009

#12

• Dec 23, 2009

• #12

We have a long cool down lane at our track and I've blown right thru 110 with no issues. I'm at 6 grand then but I prefer to stay under that. 4.10's should not be limiting your top speed thru the traps in 4th unless you are reaching mid to low 12's.

 

MaxedGT

Member

Mar 31, 2005

304

0

17

Surrey BC Canada

Dec 23, 2009

#13

• Dec 23, 2009

• #13

I read a similar post somewhere else. Turned out the car was a rental unit originally, and had a speed limiter that couldn't be overriden.

 

SaleenGT2001

Well-Known Member

Jul 18, 2005

2,811

4

58

Four Oaks NC

Dec 23, 2009

#14

• Dec 23, 2009

• #14

MaxedGT said:

I read a similar post somewhere else. Turned out the car was a rental unit originally, and had a speed limiter that couldn't be overriden.

Click to expand...

they can always be overridden

 

S

san~man

O-G

Founding Member

Nov 29, 1999

8,546

3

78

A little grass shack on a big lava rock

Dec 24, 2009

#15

• Dec 24, 2009

• #15

My old car had 4.10's on the 4R and did 140+. There's some other problem besides his gearing.

 

MaxedGT

Member

Mar 31, 2005

304

0

17

Surrey BC Canada

Dec 25, 2009

#16

• Dec 25, 2009

• #16

Could be even as simple as a plugged fuel filter. But sounds like you're hitting a speed limiter.

 

Pearl02

Member

Nov 27, 2004

496

0

16

Kansas City

Jan 3, 2010

#17

• Jan 3, 2010

• #17

Make sure your carpet isn't way of the gas pedal. I felt stupid when this happened to me. Can you go back to your stock programming? I would try that and see if that takes care of the problem. I have a X-cal2 and my car will easily blast thru 100mph. Pearl02.