i was racing a '02 mustang gt and i was pulling on it very very well and then i hit 140 and i stopped accelerating. this was not good for me but im curious if the fd has a governer and is it easy to remove and how do i find it. please help im new to the rotor monster.

 

The speed is limited by power. If you want to go faster, then start modding the car. However, I would reccomend not going that fast on the street too often, though

 

The car is to supposed to go close to 160mph stock but like P'cola FD said it all depends on how much power you got u can go faster or slower than this depending on how healthy your car is.

 

i thught stock fd's go up to 160!...mine slow as hell but i took it up to 172 and its an auto...

 

Maybe this is a really, really dumb question, but did you forget to shift into 5th? Redline in 4th gear is right about 140 MPH...could you have bumped into the rev limiter?

 

The only thing I can think of to cause a governor like symptom is hitting the rev limiter in a lower gear. I don't know the ratios, but extrapolating my fifth gear rpms at speed, I figure the hard redline in fifth to be about 200mph. If the gears were evenly spaced (I don't know if they are or not) would give each gear about 40mph.
If that were the case:
first = 40 (seems almost right from my experience)
second = 80
third = 120
fourth =160

That doesn't fit a 140 cut-out, but I'm just guessing here anyway.

 

Nope, 4th tops out at 140 mph. And since the power drops off noticeably after 7500 rpms, you probably forgot to shift into 5th! I've actually redlined the car in 4th in a highway race with a Silvia, so I know that in the heat of battle, it's possible. And yes, a stock base or touring (no wings) should pull over 160. An R model will have trouble hitting 158 due to a poorer Cd.

 

Probably a boost leak some where..

During the WOT.. Ypipe couppler, IC connections
likely.. Tend to sing like canaries under heavy
loads. use constant torque clamps.. and
see what happens..

 

there is no way your gonna do 160 in 4th gear unless you replace your gears or if you get a lower rear diff ratio.

 

Yeah, with stock gearing on a 5-speed, the max speed at redline breaks down something like this:

1st: 42
2nd: 72
3rd: 106
4th: 140
5th: 204

Those are not the exact numbers from the numerical calculation, but rather my best memory from the last time I calculated it out. The numbers are pretty close though...I can attest to having been to redline in 4 out of those 5 gears

 

hey, ryanberg, why do you think that r models cant do 160 with the wings, because of the higher drag coeficient? thats bullshit! my first fd was a touring with front r1 dam and a huge eurbuni four point wing on the back(resembled the vielside shogun wing) and my car just slowed its rapid acceleration @ 163, but it was still climbing, really, really slowly (i couldnt top it out cause i got pulled over) and, the car was BONE stock, two major accidents, and drivers side rear ride hieght was higher by an 1.5 inch or so. i dont think my current lighter r1 will "have trouble hitting 158", to speak with out knowing is ignorance at its best.

 

Something tells me you had no business going that fast in a car that condition.. you should have thanked the officer for saving your life. Rynberg takes the time to make a worthwhile contribution the this forum very frequently and you come on and blast him saying his comments are ignorant? I don't doubt your account one bit, the fact remains that between two stock FD's (one wingless and one with a wing) with equal engine health etc.; the wingless will have a higher top speed due to a lower CD. Fact.

Matt

 

And you think the stock speedometer is 100% accurate at those speeds? Almost every car made exaggerates the reading in the top end (I seem to remember MT testing the porsche 911 TT to a little over 180, the Porsche speedo said over 190). It is a FACT that several different car mags have tested an R model to 158-159, while tourings reached 162-163. It is FACT that the R models have a drag coefficient of 0.31 and the base and touring have a Cd of 0.29. If you don't think that 0.02 difference will buy you a couple of mph at those speeds, you need to take an aerodynamics course. All that aside, there are certainly differences between individual cars and MAYBE your speedo was correct. The point is, you would still reach a higher top speed if you removed the front lip and that ricer wing of yours.

BTW, You could have come on here and simply posted that your car made those speeds. Why do you have to personally attack me?

mjw: thanks for getting my back. I appreciate it.

 

You might have activated fuel cut because your boost was creeping. Do you know how much you were boosting when it stopped accelerating? What are your mods? The stock ECU cuts fuel when it sees too much boost, and under other circumstances it seems.

Not good to be hitting fuel cut too often, as that you run lean under these conditions. Lean A/F = detonation = 'poof'.

 

WTF Y are you all driving 160 mph you are just asking to get *** raped by a ******* trooper.