Top speed for GT-R Touring Car

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Addyboy

Addyboy

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GTA4Maniak
Hey y'all, I have a GT-R R35 Touring Car and I want to reach the maximum top speed possible with it. I have searched on Google for "formulas" to allow the transmission to make the car go faster, but didn't find anything except acceleration formulas. By now, my car reaches 308 km/h, but I bet she could go faster. I don't want to install new engine parts for now since the car would be too powerful for the races I have to do, but is there some kind of formulas or method to make the car reach its highest top speed possible?
 
Addyboy
Hey y'all, I have a GT-R R35 Touring Car and I want to reach the maximum top speed possible with it. I have searched on Google for "formulas" to allow the transmission to make the car go faster, but didn't find anything except acceleration formulas. By now, my car reaches 308 km/h, but I bet she could go faster. I don't want to install new engine parts for now since the car would be too powerful for the races I have to do, but is there some kind of formulas or method to make the car reach its highest top speed possible?
Click to expand...

Yep there is.

First, we need to know the drag area of the car. To find out, make the following test:

1. Set engine limiter to 50%, so we get a nice and flat power curve.
2. Make a top speed test at a horizontal track (route X, for instance. Don't count the top speed you get going down the bridge, only what you get going horizontal.
3. Report back here with the following:
  • Power without the limiter
  • Power with the 50% limiter
  • Top speed with the 50% limiter
 
eran0004
Yep there is.

First, we need to know the drag area of the car. To find out, make the following test:

1. Set engine limiter to 50%, so we get a nice and flat power curve.
2. Make a top speed test at a horizontal track (route X, for instance. Don't count the top speed you get going down the bridge, only what you get going horizontal.
3. Report back here with the following:
  • Power without the limiter
  • Power with the 50% limiter
  • Top speed with the 50% limiter
Click to expand...
Do I do this on stock gearing or on my on gearing I already made?
 
eran0004
It doesn't matter, as long as it's tall enough for the car to reach top speed without hitting the rev limiter.
Click to expand...
Power without limiter: 697 hp
Power with limiter: 348 hp
Top speed with limiter: 242 km/h at 5th gear (before climbing the bridge) but I have 6 gears
 
Addyboy
Hey y'all, I have a GT-R R35 Touring Car and I want to reach the maximum top speed possible with it. I have searched on Google for "formulas" to allow the transmission to make the car go faster, but didn't find anything except acceleration formulas. By now, my car reaches 308 km/h, but I bet she could go faster. I don't want to install new engine parts for now since the car would be too powerful for the races I have to do, but is there some kind of formulas or method to make the car reach its highest top speed possible?
Click to expand...
Just bought one, set the top speed in the tranny to 217mph (340km/h?) and reduced downforce and it did 315km/h. Thing is it has 625pp at that power - you can still run 650pp with engine mods and no turbo, where it'll do over 330km/h.
 
lbpomg95
Just bought one, set the top speed in the tranny to 217mph (340km/h?) and reduced downforce and it did 315km/h. Thing is it has 625pp at that power - you can still run 650pp with engine mods and no turbo, where it'll do over 330km/h.
Click to expand...
Alright I'll try this. But if there's still a way to go faster than that without engine mods, I'm always interested :)
 
Addyboy
Power without limiter: 697 hp
Power with limiter: 348 hp
Top speed with limiter: 242 km/h at 5th gear (before climbing the bridge) but I have 6 gears
Click to expand...

Okay, based on that I get a theoretical top speed of 305.1 km/h ± 1.3 at 697 bhp. That's ignoring rolling resistance though, so it's probably a little bit higher.

As for transmission tuning: What you want is to place peak power at top speed. So if you get peak power at, say, 7000 rpm, that's where you want to be when you're at top speed. If you're above 7000 rpm (or whatever your peak power rpm is) you need a slightly shorter top gear, and if you're below 7000 rpm you need a slightly taller top gear.
 
eran0004
Okay, based on that I get a theoretical top speed of 305.1 km/h ± 1.3 at 697 bhp. That's ignoring rolling resistance though, so it's probably a little bit higher.

As for transmission tuning: What you want is to place peak power at top speed. So if you get peak power at, say, 7000 rpm, that's where you want to be when you're at top speed. If you're above 7000 rpm (or whatever your peak power rpm is) you need a slightly shorter top gear, and if you're below 7000 rpm you need a slightly taller top gear.
Click to expand...
And how do I know which ratios I have to chose precisely for each gear?
 
eran0004
Okay, based on that I get a theoretical top speed of 305.1 km/h ± 1.3 at 697 bhp. That's ignoring rolling resistance though, so it's probably a little bit higher.

As for transmission tuning: What you want is to place peak power at top speed. So if you get peak power at, say, 7000 rpm, that's where you want to be when you're at top speed. If you're above 7000 rpm (or whatever your peak power rpm is) you need a slightly shorter top gear, and if you're below 7000 rpm you need a slightly taller top gear.
Click to expand...
Ok I think I got it. So my rpm when I'm at top speed (307 km/h before climbing the bridge) is around 7400rpm and my peak power is at 7300 rpm. So I need a shorter top gear right? And that's it?
 
Addyboy
Ok I think I got it. So my rpm when I'm at top speed (307 km/h before climbing the bridge) is around 7400rpm and my peak power is at 7300 rpm. So I need a shorter top gear right? And that's it?
Click to expand...

You're above the peak power rpm, so you need a taller top gear (smaller number). Just a little bit though.
 
eran0004
You're above the peak power rpm, so you need a taller top gear (smaller number). Just a little bit though.
Click to expand...
Alright I'll try it, sounds good since I tried the shorter gear and it gave me 300 km/h top speed at rev limit
 
eran0004
You're above the peak power rpm, so you need a taller top gear (smaller number). Just a little bit though.
Click to expand...
So, I tried this and it did work :) I have reached 309 km/h before climbing the bridge on Special Stage Route X, and I feel like I could push it a bit more, but I don't want to since it still has its typical acceleration of a 4WD, but lost a bit of the BAM when I reaccelerate. I want a fast car that goes fast but still good on track, and I have it. So if anyone want the settings I got on my GT-R, here it is;
Transmission ratios:
1. 3,745
2. 2,565
3. 1,676
4. 1,198
5. 0,923
6. 0,794
Final Gear. 3,920
Set top speed at 400 km/h or around 248mp/h
Then you can adjust it as you wish, but it's a good base to start on I think. Thanks to @eran0004 :) and @lbpomg95 for the trick on the downforce, wasn't sure about it.
 

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