Yo.... I got extremely bored today and compiled a vehicle speed vs. engine speed graph today for RalliArts and I spent forever making it look cool (IMHO). It should be pretty helpful to anyone with an MT and especially for those with stock or close-to-stock tire height. I can easily make another if certain people want it to be accurate with aftermarket rims and tires so long as you give me full info. Let me know if there's something I left out.

EDIT: New version uploaded, includes correct tire height (205/50/16) and reverse gear.

205/50/16


205/45/17

 

looks good...great job

 

Aren't the stock tires 205/50/16, with a height of 24.1"?

 

Yup.

 

That is cool.......and you CAN go about 80 in 3rd!
Eclipse2Lancer tested, engine approved....but not happy about it!

 

80 is the shift point for spirited driving 3rd to 4th with the AEM intake I have. It's interesting to see that only 1 actual hp mod makes a good bit of difference to top end in each gear.

Very nice job Blackhawk.

 

pretty nice but mine is a little different, i got bout 62 or so in2nd gear, and 83 in 3rd... is it my mods or is that graph just not 100% accurate?

 

I'd like to take this time to explain the basic concept of gearing to those who haven't explored this area yet. Quite simply, your engine is linked to the wheels through your drivetrain. In our case (FWD), there are only two things that can change the ratio between the engine (RPM) and the wheels (MPH). These are the gearbox (gear ratio) and the differential (final drive ratio). In our case, the conversion ratio for the gears range between 3.363:1 and 0.820:1 and the final drive ratio is 4.058:1. This means that the gearbox reduces each rotation of the engine by a factor of the gear ratio, depending on the gear, before transferring this to the diff (or transfer case or what have you). The diff then reduces each rotation by a constant factor: the final drive ratio. So between the engine and the wheels, there are two gear reductions that take place and therefore can be multiplied together to find each gear's effective gear ratio, which in our case ranges between 3.33:1 and 13.65:1. Beyond gearing, the only thing that can affect the link between engine speed and wheel speed is obviously wheels. The combined height of the wheel and tire from ground to top of tread is the last factor that can possibly affect this linkage. Though some modifications may free up power or torque at certain RPM's or may pull harder at the top speed of a gear or whatever, this is unrelated to gearing and can be attributed strictly to torque/hp. Obviously this table is going to be skewed for aftermarket rims and tires, but it's right on for those with stock setup and gives an idea of the gearing for others (unless you're rollin' on 20's or somethin).

Yeah I had a major brain fart there. New version addresses that. Though my stock Perelli's are so worn down, mine's probably closer to the old version .

Yeah if you're at 80 in 3rd, your hand should be already applying pressure to the shift knob heh. Your intake can't possibly change anything in this table, the only thing it can change is the amount of HP or torque at a given RPM, not speed though. I know you're on 16's, but what's your tire size? Thanks for the feedback .


You should go check out your top speed in 55mph because if it's actually 62, I'd like to know how in the world you accomplished that with 17 inch wheels. What's your tire size?

If some of you want a chart for a common aftermarket wheel/tire size like 205/45/17 or something let me know; it's really easy to make.

 

thanks for the info!!!

 

+1 . very good info

 

I've tried that before, some people just don't seem to get it.

 

Has anyone noticed in the graph how each gear almost exacly spaced between the others??

This may be a little of topic, but when I used to play Gran Turismo, I always liked to play with gearing and always noticed that in order to evade bogging the car, I had to space the gearing in a likely manner (with almost the same space between the graph lines of each gear) or else the performance sucked.

Nice job btw

 

Please do.

 

That's the beauty of a close-ratio tranny geared for acceleration. Evidence of this is when you shift at the same point while running through the gears and the engine drops to almost the same RPM in the gear that you're upshifting to. The only negative is that high cruising speed = high rev even in high gear. For example, ~75mph places the engine in MIVEC range in 5th gear, making freeway driving really annoying. One thing that I've never understood is why they put 4th and 5th SO freaking close together... I don't think I've ever benefitted from this in the history of driving my car. Anyways, thanks for the feedback.


Done. Any more requests?

 

bump... any more common tire sizes?