clownracer

https://www.rx7club.com/photo/showph...cat=500&page=1

thats alittle low and i see everyone here claming 140 and such who should i belive???

gergrx7

in japan its limited at 112. in US cars there is no goverener/limiter

siamiam

it was a japanese spec model and governed like most jdm cars to 112mph which is easy for the buyer to delimit the car.

the car companies have a 112mph gentelmans agreement over in Japan.

Digi7ech

iTrader: (1)

Yeah isn't it just a switch on the back of the cluster?

Mason Rx7

Ive done a hell of a lot faster than 112 in my N/A...

Try like 135

Digi7ech

iTrader: (1)

Taken directly from the pic description
Infini was never sold in the US meaning it's Japanese specs.

Your NA never topped off at 135 because you have a US car(NA's weren't in Japan).

Anyway, I've hit 135 in my GTU before.

Looking forward to 140-150 w/ the new engine

boostin13b

No there is no govenor on American models. I've been up to this point a few times. I'm shooting for 200 next. Just got the new intercooler in and once I get my new tires on I'll be out there ready to try again.

Don't give me **** about the tac, I dropped it in neutral before taking the pic, this was on back down.

casio

aww, your speedometer looks sad. or possibly impotent?
have you done the math to get a more accurate mph?

amused

um, what kinda mods do you have?

even when compensating for the speedometers obvious calibration error, i really doubt an FC could go 170.

i was told once that with all the mods we do to our cars they really dont change the top speed of the car as much as performance and acceleration.

clownracer

1st case of an amercian version of a car being faster then an overseas version although i bet with the speed limiter removed that would romp all over an americian rex

FB II

gearing son...... gearing. i have a video of my friend in his 240sx with the sr20det motor in it doing 178mph. it's alll iinn theee geaarrrrs.

Digi7ech

iTrader: (1)

Other than the Infini the GTR/GTX's are the same to our TII's.

The only difference in the Infini's was stuff like seats,wheels, and I think exhaust and strut bar.

Like we said above it's just a switch because they have a Gentlemans acknowledgement.

This is why you see a lot of cars with the 280ps rating for HP. They have this acknolwedgement there too kind of.

boostin13b

After that run, we took it to the dyno and the MPH were within 1MPH. At about that point, the dyno read 185 and that's about what I guessed, give or take a couple. I thought it would be a little high due to the tire wear I have.

boostin13b

I have a JDM S4 shortblock with S5 accesories. Turbo back exhaust, Bonez K&N, Bare block including power steering and A/C, GTU body with JDM TII drivetrain, Stock 4:10 gearing and tranny, ACT max 6 puck, and that's all I can think of then. I was also running 13PSI on the stock intercooler until it cracked causing a leak. I just installed my H mount setup and working on the splitters and ducting now. I got the idea from BlueT2's car. I have an FD manifold I'm polishing and going to throw on soon enough. That speed was around 7300-7500 RPM if I remember correctly, I wasn't really paying too much attention since things were kinda going by really fast.

Here are some of the pics of the intercooler in the making.

Madrx7racer

not true......it's limited at around 150........i could not go faster.....everytime I hit 150 it would decel to 145 and it kept on doing that......

casio

did the dyno account for aerodynamics and headwind?

gergrx7

Do you not read?!?! in JAPAN, not US, it is limited at 112. US there is no limiter/goverener

boostin13b

The aero and headwind don't throw the Speedo off. I hit around 190 on the dyno still pulling hard, but that's the day the intercooler cracked so I got out of it right away as hot air was just blowing out of the engine bay. I was going to go over 200 on the dyno before that happened.

In the pic above, I hit around 190 and was able to take a pic before I dropped too much speed, and that was maxed out, wouldn't go any further, I held it for about 5-10 sec's to see if I could get anymore out of it before getting out of it just to make sure that was the top speed. The car started to get warm too at that point.

Madrx7racer

well according to you it is only limited in Japan and you are right.....and not in the US....and I am telling you that you are wrong......the FC is limited at around 150 MPH.

casio

i wasn't talking about "throwing the speedo off," i'm saying that the speedo is already off. the topic was beat to death in another thread, the speedo is inaccurate (passed 90mph approx. seemed to be the number). to do a top speed run on a dyno is pointless unless it can register load, realistic headwind, aerodynamics, etc. thats why i said it would be best to do the math. it was also brought up that the stock tach is known to read high, but better to use it and math than just the speedometer.

boostin13b

Well the dyno has accurate MPH numbers and no it's not good for a accurate top speed for your car, but it does show how accurate my speedo was. Like I said, I was pulling way harder on the dyno and would have passed the 200 MPH point because there was no headwind, but on the road, I couldn't go past 190 because of the aero and loads on the car.

Terrh

iTrader: (7)

my TII went 112 on one rotor...

all japanese cars are limited to 180km/h or less.

Madrx7racer

by "all japanese" I hope you mean JDM..........otherwise you are wrong.

boostin13b

I've seen a JDM swap with the JDM ECU still in it do plenty more.

casio

"5000rpm, with a .711 5th gear to a 4.1 rear-end yields 122mph with 205/55R15."
"With stock tires on a S5 TII, 6K in 5th is about 145mph."
"a s5 tII should be able to hit 140-150ish, depending on weather, location, etc. Much more than that is pushing belief."

Formula for MPH:
MPH = Tire Radius / 168 x Engine RPM / Gear Ratio

Example: What MPH at 6500 RPM with a 4.9 rear axle and 14 inch radius tire in 4th (1:1) gear?
MPH = 14 / 168 x 6500 / 4.9 / 1 = 111 MPH

Note: Tire Radius is distance, in inches, from center of wheel to the top of the tire.
Note: Gear Ratio is Rear Axle ratio divided by Transmission Gear ratio.

or go here: http://www.f-body.org/gears/