brett5

what mph should i read on my speedo with the 3 inch pulley at like 7 grand in all the gears? and does anyone have the gear ratios??

-Jayson-

supercharger pullies dont effect speedometer...

D4u2s0t

just how quickly they move

but yea, 7krpms is 7krpms.

1st gear is like 40, 2nd is around 72, 3rd is around 110, these are estimates but are prett close.

Badju587

Ratios:

1- 3.38
2- 1.76
3- 1.18
4- 0.89
5- 0.7

Speeds @ 7k w/stock (or stock-size) rims and tires:

1st - 39
2nd - 75
3rd - 111
4th - 148 (stock and S2 are limited to 147 IIRC)
5th - 188 (theoretically anyway, takes a good amount of power to top out at 188).

thought

Is this another "epic thread" in the making?

brett5

and what if your on a 225/35

coopn8r

My redline in second gear only goes to 65 at 7200...

Explain

D4u2s0t

either your speedo is off because of different size tires, or the engin is revving so quickly at that speed that the speedo is off, or the redline is different, which i don't think it is.

coopn8r

Dunno. I am on stock tires. Talked to another redline owner and he redlines at 65 as well. Speedo off that much? I would not think so. Or is it only off at wide open throttle?

Infernokron

I believe redlines have different tire sizes. It's not that the speedo is off but that you get less distance per rpm of the motor, therefore lower speed at 7k rpm. I haven't actually checked the IRL tire size so I could be wrong but I think that's why it's like that.


[EDIT]

Ok I ran some numbers...
Ion Redline stock tire size 215/45/17
Cobalt SS/SC stock tire size 215/45/18

Ion Redline
Engine speeds in top gear:-
30 MPH = 1175 RPM 40 MPH = 1567 RPM 50 MPH = 1959 RPM 60 MPH = 2350 RPM
70 MPH = 2742 RPM 80 MPH = 3134 RPM 90 MPH = 3525 RPM 100 MPH = 3917 RPM

Top Speed in 1 gear = 37.009 MPH
And changes into 2 gear at 3645 RPM dropping 3355 RPM
Top Speed in 2 gear = 71.073 MPH
And changes into 3 gear at 4693 RPM dropping 2307 RPM
Top Speed in 3 gear = 106.008 MPH
And changes into 4 gear at 5280 RPM dropping 1720 RPM
Top Speed in 4 gear = 140.549 MPH
And changes into 5 gear at 5506 RPM dropping 1494 RPM
Top Speed in 5 gear = 178.698 MPH
************************************************** ****************************************


Cobalt SS/SC
Engine speeds in top gear:-
30 MPH = 1134 RPM 40 MPH = 1512 RPM 50 MPH = 1890 RPM 60 MPH = 2268 RPM
70 MPH = 2646 RPM 80 MPH = 3024 RPM 90 MPH = 3402 RPM 100 MPH = 3779 RPM

Top Speed in 1 gear = 38.357 MPH
And changes into 2 gear at 3645 RPM dropping 3355 RPM
Top Speed in 2 gear = 73.663 MPH
And changes into 3 gear at 4693 RPM dropping 2307 RPM
Top Speed in 3 gear = 109.870 MPH
And changes into 4 gear at 5280 RPM dropping 1720 RPM
Top Speed in 4 gear = 145.671 MPH
And changes into 5 gear at 5506 RPM dropping 1494 RPM
Top Speed in 5 gear = 185.210 MPH





According to this the IRL should top out at 71mph in 2nd, and the SS/SC at 73.6mph.

Tomtwtwtw

Get your tire size, gear ratios, and final drive info, and go to this site to get the answers you seek.

http://www.car-videos.net/tools/speedrpm.asp

For those curious, here's the 2008 SS, with smaller tires, but wider ratios than the ss/sc.

6300 redline
1 35.1
2 67.5
3 100.7
4 133.5
5 169.7

coopn8r

Still top out in second at 65

Tomtwtwtw

Take 2nd gear to redline slowly vs. wot and see if there is a difference. If there's any lag, that'll show it. It's simple math - there's either a difference in gearing between the two, or a defect in the instrumentation.

coopn8r

Alright I will try it the slow way. If your wrong I will ******* murder you!! Lol just kidding. But seriously.

theneelster

Blasphemy!

coopn8r

67 when slow. Still not 70. I was pushing it to get 67