Does anyone know what the top speed of our car is with the speed limiter removed? How fast have other members had their cars? I got mine up to 145 MPH the other night. How fast is a TT or SC Z?

Zach

 

I will let u know once I get my Plenum and get the limiter removed.

https://my350z.com/forum/showthread....threadid=78183

 

It's 155-156MPH. You did 145 on the track, right ?

CaptinB

 

CaptinB, no I did it on the way home from the strip in Steele, AL this past Friday. Im an idiot, I did it on the interstate at around 2:00 am. This was my 1st run at a strip and I couldnt break 97 MPH. I ran somewhere around a 14.562 I believe. By the way, I have an AT.

 

You can hit 160 mph! But bounce of the rev limiter...

 

Actually if you calculate it, the 6th gear is good for like 190 mph. However after you redline 5th I have found that there is not much more left in the Z. I doubt you will get any more out of it with the speed limiter taken off.

 

Gotta love the Alabama interstates. Long, straight, smooth (usually) and not a car in sight at 2am.

I must admit that I'm guilting of doing about 120 on I10 one night late. 75 to 120 doesn't take long at all


CaptinB

 

Notice he said "I got mine up to 145 MPH the other night. How fast is a TT or SC Z?"

 

Mine's hit 160 on the digi-speedo. The analogue is generally 2mph higher. The car was still pulling, so I'm not really sure how the speed limiter works, or even if it exists.

At that at that kind of speed, the speedo is inaccurate, so if the limiter works on wheel revolutions, say, it could still be a 155 top end.

 

I hit 255 km/h (159mph)

I also checked accury with a GPS one time, at 253kmh on the digi-thing, the GPS was reading 252... so it is extremely accurate

I never felt of bumped into any "limiter", but it wouldn't go higher

 

Whats your point???

 

I hit 195.5 mph on the dyno with 6MT ATI s/c car with 7200 rev limit. I doubt it will do that on the road but the s/c may give it enough power to get up pretty high.

 

at 6600 redline, your around 180 physicly limited if I remember the last time I figured it out.

but to get rid of the limitor you have technosquare, as vandy said, that means 7200RPM, so I guess 195 is doable.

obviously this would take alot of power to do, probably 6-700 to be honest. and Id be slightly concerned with downforce at this point; along with the integrety of the car as a whole. thats alot of speed; redlining the engine at 7200RPM with over 600hp, 195mph, ect ect, lot of components at limits they were never really intended to see.

 

i hit 159mph the other day both on the digi and the analog. i thought it'd stop at 155mph but it just kept going. even at 159 it would have gone more but i had to slow it down because i was approaching another car. it might have read 159mph just from being inaccurate, or possibly because i believe though i'm not absolutely sure when i hit that speed i was on a slight downhill (very slight at most though), or maybe as i remember having read somewhere a while ago the earlier production z's dont have the governor.

either way, too bad my friend who was in the car nor i had a camera on us.

 

The Z has a limiter. I tried it many times to prove it. I have taken the wind stream of a modded M5 once (that had its limiter removed) and could't go more than 255 kmh (159mph)!

 

What is the formula for calculating theoretical top speed? Doesn't it have something to do with gear ratio, final drive, wheel diameter/height, and rpms????

 

I have a gear calculator that I made in Excel, PM or post your email address and I will send it to you. You need to know tire size (diameter in millimeters), max RPM, gear ratios and final drive ratio. It's pretty cool, you can plug in different tire sizes, FDRs, redlines etc and see how that affects many things.

I use this site to calculate tire diameter:

http://www.autocrossing.com/cgi-bin/tiresize.cgi

The Z has a speed limiter of 160mph indicated or 150 actual according to the dyno i hit it on. (waiting now for someone to give me a lecture on aerodynamics and how they don't apply on a dyno). Well my point is thoeretically if you had enough power, you couldn't go faster than 160 indicated/150 actual unless you removed the limiter.

 

Ok I'm stupid. I forgot that website has a gearing calculator too. Fill in the ratios, tire size and max rpm (where ever you shift, probably redline) and you're set.

http://www.autocrossing.com/cgi-bin/gearcalc.cgi