SNES Mechanics (Work in Progress)

**Intro**

Nothing contained herein is permitted for use on Fandom, Fandom-owned properties, including GameFAQs, or other Creative Common works. Nor is it permitted for AI usage. Consider this guide a beta version for the time being.

Looks like no one ever dived into this game. Ready to be the one man army. I used BizHawk with BSNESv115+ core and Mesen with the unheadered ROM. Expect some minor errors. I haven't examined the disassembly.

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**Addresses**

- $001821: Damage starting at 0 for 0x00, 50 Damage is 0x32 and 95 is 0x5F. I can't get KOed at 100 damage. Capped at 95. The Damage is the percentage of the bar that is red, making 95 Damage = 95% red and 5% yellow.
- $000F43: Speed starting at 0x00 and the max appears to be 100 = 0x64 in hex. Always greater than or equal to 0.
- $000C18 and $001690: Speed Coefficient that is 50 = 0x32 on the track, 60 = 0x3C at peak turbo on the track and seemingly as low as 21 = 0x15 off the track. Not sure why there are two addresses for the same thing. $000C18 can update 2 frames faster.
- $000EF6: Horizontal Velocity is like Speed on the X axis. Start of race, you are driving on the +X axis. Velocity the same as Speed in this case. Reverse direction is *(256 - Speed)* aka two's complement for Velocity. You get 0 Velocity when driving perpendicular on the Y axis and you get the values in between as the angle changes. Should be something like *Speed x Cosine(Angle)*. Wouldn't surprise me if there's a Vertical Velocity value using *Speed x Sine(Angle)*.

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**Speed**

Hard to tell which values are the X and Y coordinates since there are multiple candidates. The distance traveled is something like *Speed x (Speed Coefficient / 50) / 60* for 1 NTSC frame. Implies subpixel values or positioning is 16-bit versus 0-255.

Off track has a lower speed coefficient and max speed by extension. All the off track terrain types affect cars the same, whether driving on grass or in the beach water or what have you.

Speed is kind of screwy. Like Raphael at max speed on track can be 70 give or take a few points. It doesn't change while driving straight. I think changes based on the angle you're driving due to trig approximations. The X axis appears to yield the minimum max speed.

Speed granularity is a thing. On track, I clocked Raphael with 9/10 speed rating and Sumo San with 8/10 both doing 63-63-63-64-64. The speed shifts once per frame for 3 frames at 63 speed then 2 frames at 64, then repeat. This yields an average Speed of 63.40. That was with 0 damage. At 50 = 50% damage, Raphael was 61-61-61-60-60 for 60.60, while Sumo San was 60-60-60-60-61 = 60.20. At 95% damage, Raphael was 58-58-58-57 for 57.75, while Sumo San was 58-58-58-57-57 for 57.60.

As a comparison, Hodja with 5/10 speed rating was a constant 63 speed at 0 damage, 60 Speed at 50% damage and 57 speed at 95% damage. Like 1% less speed than Raphael and Sumo San but he feels slower than that in reality. I presume the speed coefficient magnifies the difference.

The extra speed rating point for Raphael over Sumo Sam barely matters, while Sumo San has slightly better acceleration as we'll see below.

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**Speed Coefficient**

Every driver has 50 speed coefficient while driving on the track and turbo boosts it to 60. Off track, I saw 15 for speedy Raphael and Sumo San, 17 for Hadja and 18 for slow Frank. I haven't determined if this means slower drivers don't lose as much speed but is what I expect. No change off track for turboing. The coefficient value is independent of current speed. It's 50 on track whether you are stopped or at max speed.

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**Turbo**

On track under turbo, the max speed quickly rises by 20 for every driver then falls back down. Different drivers naturally have different max speeds. Sumo San at max 65 speed would boost to 85. What I named the speed coefficient quickly rises from 50 to 60 for every driver then falls back to 50.

There are two screwy things with turbo. The first is jumping ends it. You will no longer gain speed or speed coefficient from turbo and they both start falling back. The second is if you use a turbo while off track, it won't seem to do anything but it's stored and will activate once you get back on track. Unless you jump in between.

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**Jumping**

Ends turbo as mentioned. You maintain normal driving speed if used while on the track which is obvious enough. If you jump while off track, you start gaining speed and speed coefficient as if you're back on the track. Thus jumping is equivalent to driving on the track but no turbo allowed.

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**Damage**

Damage thanks to the Hodja test looks like a speed reduction after dividing by 10, meaning 50% is -5% and 95% damage is -9.5%, rounded to -10% speed.

Driving on a mine is +8 damage to every racer and the yellow repair square is -20 damage. I didn't look at punches or special attacks where I'd have to consider the Attack and Defend stats.

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**Acceleration**

With frame 0 being the start of holding B (gas) from a stop, I counted the frames to reach max speed. In every case, 50% damage made no difference, only the max speed was slightly reduced. In other words, acceleration is immune to damage.

- Frank Accel 9/10: 117 Frames (1.95 seconds)
- Hodja Accel 7/10: 121 Frames (2.02 seconds)
- Sumo San Accel 4/10: 133 Frames (2.22 seconds)
- Raphael Accel 3/10: 142 Frames (2.37 seconds)

All NTSC values. We're mostly concerned with the time to reach max on track speed from the off track speed so the differences are less in reality. I didn't look at the speed reduction from hitting a mine. You hold B (gas) right before the first green light for the free turbo start.

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**Future**

I didn't look at what the handling stat did. Would be really nice to figure out how max speed changes when I've seen Raphael at 75. Cooldown time for attacks would be useful to know, as would how acceleration and turbo increase speed each frame. Then if holding Y to spam turbo is frame perfect or if there's some guaranteed delay. May as well confirm PAL SNES is 16% slower and hopefully the Collection isn't different enough to be separated.

NewSchoolBoxer

Street Racer

Super Nintendo

Sega Genesis

Sega Saturn

PlayStation

Game Boy

Neffets

Mitsuka_Shihai

sascha-gaming

ThriftBytes

USA / NTSC

EUR / PAL

JPN / NTSC

Sega Mega Drive

Saturn

Gameboy

SNES

Mega Drive/Genesis

MS-DOS

GameBoy

PAL game. Must be run on PAL hardware or 50hz emulation.

Platform Category

This is a seperate category for the games that can be played in the Collection game available on Switch, Playstation, Xbox and Steam.

Street Racer Collection

Amiga

UPDATES

HiiragiTia's SNES runs are unintentionally cheated by using an emulator with overclocked PPU

Street Racer Collection is out on Steam, Switch, PS4, PS5, Xbox One and Series X|S

Rules

SNES and Genesis versions not the same.

Deleted my run afirmed! Ex: Ghost_Prototype

Sonikkustar