kevsmu4

If I recall correctly the cobalt s/c torq stars to come back down after 5600RPM and the hp continues going up until 6500 (red line) or so..??..??

What are the ideal RPM shift points for the fastest 1/4 mile???

Black05

Here are my shift points, and i've run some pretty decent mid 14's stock with stock tires:

1st: 6,200
2nd: 6,100
3rd: 6,000
4th: wind out as much as possible. I would assume around 6,000 if you're going for more than a 1/4 mile

ralliartist

1st: 7400
2nd: 7400
3rd: No need to shift

kevsmu4

wow, very interesting, I figured the answer would have been 6500 for all gears....

Shermen

i would think it would be the point at which you make the most torque in each gear. this is what i do on my yfz

xmusic_addictx

Your running all stock internals to arnt you? or do you need like ferrea valves and springs to run that?.. I was thinking about upping my redline to around 7200-7400, after my winter project

Sergio

Shift at redline - always.

The LSJ has a gorgeous torque curve and holds the torque all the way to the top!

Zach06CobaltSC

7k-7500, its personal preference after 7k. But you should always take her up to 7k or 7500 give or take. IMO if your shifting AFTER 7400rpm you should grab springs and or valves.

D4u2s0t

shift at redline. in the ss/sc there's no reason to shift earlier.

mid 14's are not that good. shift at redline and i bet you knock some time off.

ralliartist

completely stock head and block.

so true, my tq curve doesn't change more than 10ft/lbs all the way up!

theneelster

7200 is doable I wouldn't go higher on the stock valvetrain. The reason why: with the stock blower (and/or cams) you don't make power that high.

chris88z24

Seeing as how the car builds power all the way to redline you are going to want to rev as high as possible. I shift at 7k-7200 each gear.

x2.. I ran a low 14 (14.2@100) when I was stock shifting at redlinez.

syP

thats prolly the funniest thing i have heard.. lmao

Sharkey

iTrader: (1)

basicly you want to shift high enough so that in the next gear you will be at your peak torque. being the lsj has a fairly flat torque curve and is generally a torquey motor shifting at the exact right rpm isnt going to make or break a run.

chris88z24

Okie dokie

kevsmu4

Thank you for everyone's input. It makes since to shift at 6500; in turn this is setting you for the next gear. I noticed if I try and shift into second to early to stop 1st gear wheel spin then I am out of by power band in second. I find babying it to 6000+ in first will result in a well placed 2nd gear.

rnjmur

1st gear is so low that if you don't take it up to the redline you will be out of the power band when you shift into second.

The ideal shift point for the SS/SC or TC is at redline in all gears due to the great HP and torque curves.

qwk05SS

People saying you need "valves" to rev higher? No, it's all about valvesprings. If the valvesprings are too weak, you will get valve float, and or you can break the springs. The lighter (and stronger) the components in the valvetrain, the better

I shift at 7200 every gear. That's where my limiter is set. I wish I could take 1st gear to 8k though, 1st gear is wayyy too short.

theneelster

Isn't the rev limiter on a viper like 7k? If it's good enough for a viper it's good enough for your car.

qwk05SS

I hope that was a joke. Do you know how tall viper gears are? 1st gear does like 60mph.

Black05

I've seen slightly modded rx-8's revving to 11k+, but if im not mistaken, rx-8's are the most expensive peices of **** available to the us market..

SSdan

7k every gear.