Joe Rajacic

Ok - how fast will a stock FD go with the 160 MPH speed limiter disabled?

Hoe hard would it be to disable it?

Joe

funkjaw

iTrader: (3)

I doubt it will go faster than 160 even with the limiter disabled. Even if it says 160 on the speedometer, it probably isn't going that fast.

RX7Soldier

unless you have modifications under the hood and drive train

boostmonkey

my question would be around engine upgrades also. is this car stock?

CrispyRX7

iTrader: (139)

What speed limiter? Guys I know regularly exceed 160 on the track. Is the limiter in the stock ECM?

Regards,
Crispy

chivpar

I have done 170 in my swapped Fd. felt like it was about to rattle to pieces

funkjaw

iTrader: (3)

Personally I am an FC guy so I can't say for sure if there is a speed limiter on FDs but after some research it would seem they don't have speed limiters.

However, he is talking about a stock FD, and I doubt a stock FD with stock body can make it passed 160mph. It's probably drag limited to ~160 or less.

Joe Rajacic

Back in 1998 my friend had a stock FD with 13000 miles. In 5 th gear it accelerated real hard all the way up to 160 mph where the speedo said we were all done. It felt like it could go faster so after research ( I don't remember where) we found out there was a top speed limiter at 159 MPH. Does anyone have an original owner's manual to see if that information is there?

bean12147

Is it true that a lightly modded FD can reach 300km/h with the right gearing 3.9 rear end

CrispyRX7

iTrader: (139)

IIRC a stock manual FD with a 4:10 rear end is geared for 199mph at redline in fifth gear. Stock, it doesn't have the power to get there but it is geared for that speed.

Regards,
Crispy

BlueTuner

Sooo basically your looking at about 150mph on stock, my auto with everything besides a porting, that includes intake all the way to exhaust, pfc, suspension, i was able to hit 170mph, going off the pfc and felt fine, could of probably hit 185, but at 170, doesn't matter, its gets sketchy.

funkjaw

iTrader: (3)

Road & Track Feb 1992 issue..........

Top speed 159 mph (drag limited)

rye lou

That's wild. 199 mph is flying!

dgeesaman

iTrader: (7)

Bottom line: the FD is limited by drag/power to 155mph. With more power higher speeds are possible, heck you might even find a way to max out the gearing.

Also note that stock speedometers are off on a percentage basis. So it will show you going 55mph when you're doing 52mph. At 150, that's a 10mph difference plus other errors. So you need special equipment to perform any kind of real top speed run.

Joe Rajacic

Thanks for all the replies.
I remember vividly the time my friend and I ran the FD. We were at 100mph and floored it. The acceleration was brisk. The speedo was climbing very fast through 120, 130, 140. At that point I said out loud - it feels real stable; at this rate of acceleration we should hit 170( looking at the tach and seeing several more thousand RPM left to redline).. But just as we hit 160 (on the uncorrected speedo) it felt like the car just stopped accelerating. Note - we were still accelerating hard from 150 to 160. This was a 1993 with about 13000 miles and all stock. I realize every car is different and the speedo could be off. It just FELT like an electronic speed governor at 160, hence my original question.

Happy Thanksgiving to all

Joe

Federighi

iTrader: (1)

I've hit 155 with light engine/ aero mods & I'm sure a heavily modified FD will greatly exceed that.