I was wondering what the top speed of a n/a crossfire with the governor removed is? I don't ever plan on going that fast but I was curious how fast a crossfire can go if the limit is gone. Thanks.

 

deleted......guess I was wrong

 

Just and estimate but my calculations are 173 MPH unless you raise the Rev limiter. Not recommended.



I do recall someone posting 186 MPH in an NA.

roadster with a stick

 

Haven't a clue how fast it will really go. Had mine over 150 on I75 outside of Tampa once - smooth as silk and just as scary - but backed down. And once is enough for me.

Anyway, my crustry old Chrylser Mechanic AL told me with all credibility that new cars are top-end limited based upon 'factory equipment' tire specifications. A product liabilty issue, I suspect, but he said the tires that come on the XF are rated faster than she'll go.

Anybody else heard or know about this?

 

'ZR' rated tires have a 'maximum' speed of 186, or more properly, they are capable of going at that rate of speed before coming apart, though that isn't likely.
Our cars are indeed governed though just not mechanically. The ECU electronically prevents our cars from exceeding 157mph.
I've had both cars to the limiter & it's a funny feeling: it just won't go any faster. One just gets there faster than the other !
As to how fast it can go, no one really knows. Steve Hellums has had his SRT at 180. I'd LOVE to have some member some time get his Xfire out on the Utah flats & see just how fast these things WILL go. I have no doubts that the Crossfire could be in the 200mph Club.
If it can beat the air resistance as Kurtis mentions...........

 

With an ECU tune you can have your rev limited adjusted and also the top speed govener changed as well.

 

Sorry but the car's ECU has a speed limiter (governor) set from the factory, mine kicked in at 156-158 but I had it removed and the rev limiter changed when I had the ECU tuned, I have not tried to test the results though.

 

The cars of today that can top 200 all are 500+ hp. R&T did an story a while back in which 5 or 6 cars were taken down a 3 mile long runway and tried to make 200 by the second mile. The 1000 hp Viper and Veyron made it with room to spare. The cars of lesser hp all had the same problem ultimately. Their rate of acceleration above 180mph was so low that they struggled to make it within the 2 mile limit. These cars were all over 500 hp (corvette, porsche, merc, and lambo) and easily as aerodynamic as the crossfire. I dont think the SRT's 350 hp is enough to reach 200, much less the Limited's hp.

 

I would certainly tend to agree with this line of thinking. When they got the Veyron up over 250 they needed the longest test track in the world to do it. Maybe at this same Volkswagon track in Europe with over 30 miles of straightaway an XF could get up there, but certainly not an NA car.

I need an SRT....
but with a damn 6 speed!!!

 

Watch for the results from the Texas Mile and see how the SRT6 guys do... it should be interesting..
LOTS of fun if you are driving.....unfortunately I am not..

MikeR

 

Raising the rev limiter (electronically) without reducing rotational mass is rather dangerous to these expensive engines. Maybe after knife-edging the crank, and titanium springs in the heads would that be doable safely.

 

145. that's it. driving through the highlands in texas between san antionio and el paso. the car was smooth and steady until 130. then i took 20 miles to reach 145.

 

Removed by PAULW

 

I had my old 04 coupe up to 148 MPH, coming down off a hill @ 60MPH in a 2 mile stretch (it still had it's limiter). In the same place I had the SRT up to 186 MPH after I had come down off the hill @ 70 MPH, it took about 1&1/4 mile's to reach 186 from 70 on a flat surface (it has no limiter).

 

I've topped mine out on Rt 301 in Md, north of the Centreville State police barracks. I was playing around with a Porsche. The analog needle said 155mph but my GPS said 161mph.

Rt 301 is flat with shallow twists and turns.

 

Would love to do this, knife-edging just sounds badass. But I can only imagine how many codes it would throw on our touchy ECU's

 

Why do you think it would throw a code?? All knife edging does is lower rotational mass allowing the engine spin faster along with better throttle response. Just like aluminum and carbon fiber driveshafts. Titanium valve springs would prevent valve float at those higher rpms. Doing this while removing the electronic rpm limiter would allow that little motor send the car faster.

 

I didn't know if it would. I know we have like three sensors monitoring our cranks... thought it would read wrong.

 

OH MY!

Break a speed law?

Speeding is like a gateway drug, it leads to more and bigger law breaking

 

Ok I'm feeling old, but be safe doing those speeds on public roads. My zx 14 will reach 180 in 19 seconds, and hit the limiter at 186. At 180 your covering 3 miles a minute, not much time to make evasive manuvers. I came home one day to two tickets, about 3 weeks after opening the bike up on the highway. I guess I passed an off duty highway patrol in his minivan with his wife. The tickets were for exceeding 100 mph in traffic, and following too closely. Not that he could have shown it on radar, but I ended up paying a 150 dollar court cost, and 20 hrs of community service. I personally wasn't going to risk losing my liscense by pleading not guilty. Just remember anyone with a cell phone can report you.