R34 vmax 200

[drifter17a]

I am thinking of taking my 650hp r34 gtt to air field to get top speed

what is max speed of the 5th gear on standard gearbox?

 

would you dare doing 180mph on old 1998 skyline with no air bag and traction?

 

 

[Ben C34]

Going fast is fine, crashing is the problem with lack of airbag so don't do that.

 

 

 

I hope your tune is absolutely spot on, if not you will find out after sustained full throttle like that

[GTSBoy]

1 hour ago, drifter17a said:

what is max speed of the 5th gear on standard gearbox?

Do the calc yourself. You know your diff ratio. You know your tyre size. You know 5th gear ratio. You might have a better idea of how many revs it might pull at the top end of 5th (based on how much power the car makes, which we don't know either).

You don't even have to do all that. Just drive it at 4000rpm in 5th. How fast is it going? Double that number for an 8000rpm top end. take 7/8 of that number for a 7000rpm top end, etc.

[drifter17a]

Yeah kind of scared to push it to 180.

need to do some research to find the max speed. Looking around it is around 186 to 200

have pushed to 150 and feels like a fly so if crashed nothing will be left of me . Even with air bag as car doesn’t feel that strong body wise

 

i want to see how it standa against other cars so probably push to 150 and back off

 

 

[drifter17a]

35 minutes ago, Ben C34 said:

Going fast is fine, crashing is the problem with lack of airbag so don't do that.

 

 

 

I hope your tune is absolutely spot on, if not you will find out after sustained full throttle like that

Would things like air temp and oil temp show if car is holding well ?

 

for instance if i do full throttle for few runs and see temps going up or is it more tune may have problems so in 5th gear it could have wrong timing and engine pops?

 

many runs done on dyno so i am thinking map should be ok. It is custom map so with 1-2 hours of dyno I guess there out to be map issues

 

map is locked and my knowledge isn’t great to do it myself

[GTSBoy]

It might be better if you just don't do this.

[Duncan]

180mph = ~280kph, right? Most likely you won't have the power in 5th to get there, and on a runway you won't have enough distance from a standing start to get close to that.

tyres would be the only thing I'd be even slightly concerned about, so use a quality tyre with appropriate load and speed ratings, and pressure. well, that and an accurate wheel alignment with a little toe in for stability.

just an example, here our v8 supercar category run about 650hp, and over a 2klm downhill straight they are about 295km/h, and that is leaving a corner at about 100, not from a standing start.....

[drifter17a]

Please enlighten me as on serious note and maybe novice, i thought power is speed so if I have 650hp then i should be able to achieve that kind of speed

 

i can very quickly get to 125mph and 100 to 200 kph is around 6 sec so don’t understand the principle of why it won’t have puff to get to 185 if gearbox can get there

[GTSBoy]

How far do you travel each second at 185mph? Start with that number and compare it to the length of the runway, then factor in getting to that speed and slowing back down. Runway goes away at a frightening rate. Set up the equations and integrate for distance if you're capable of the math.

[drifter17a]

I see what you mean

 

my mates m5 which is stock did 192 with time to brake plentiful 

 

i drage raced him and left him for dust so ...

 

i see what was meant here thanks all

[Duncan]

It is not my area of expertise (either theoretically or practically), but I understand 300klmh+ will require 1000hp+