4500 RPM cutout

[SilverFire]

ok let me asj you guys this, when im in nuetral or in gear i can still hit 6250 rpm. i was wondering do yall think that my car has been tapped?

[Rob Bell]

Above the speedometer limits, you can still tell how fast you're going by watching the tach, since both the M5 and the A4 (when the TCC is engaged) have a direct link to the driveshaft. The engine RPM's and speed always stay correlated. So for example, my car has 3.42 gears, stock rims and tires. At 80 MPH, my tach is always at about 2600 RPM, at 95 it's at 3100 RPM. Every 500 RPM increase equates to 15 MPH:

2600 RPM = 80 MPH
3100 RPM = 95 MPH
3600 RPM = 110 MPH
4100 RPM = 125 MPH
4500 RPM = 140 MPH
5100 RPM = 155 MPH
5600 RPM = 170 MPH

So in theory those with 3.42's could go a little faster than 170 before redlining it. Of course different gears will have different RPM's. So what kind of horsepower would we need to go that fast?

[Need4Camaro]

So in theory those with 3.42's could go a little faster than 170 before redlining it. Of course different gears will have different RPM's. So what kind of horsepower would we need to go that fast? [/QB]

Not so much in horsepower but tourque wouldn't it be?... To achieve that you would have to move your tourque/max powerband upward through the RPM range won't you?

[Rob Bell]

Not sure... I thought torque was what gets you off the line down low, and then horsepower determines your top speed? But then, in reality, could our cars even go that fast without losing control? I would think that at a certain speed you'd begin to experience enough lift to create instability.

[Blue Flame V6]

Originally posted by Rob Bell:
Not sure... I thought torque was what gets you off the line down low, and then horsepower determines your top speed? But then, in reality, could our cars even go that fast without losing control? I would think that at a certain speed you'd begin to experience enough lift to create instability.

The car suspension wise could yes. I mean people have hit 200 mph in the z28's/TA's (not stock of course). Our suspension isn't much different and anyone who is getting faster the 118mph usually has upgraded the suspension.