when to shift

[ashah000]

i have a 1998 eclipse gs, does anyone have a manual for that car, if so in the manual at what rpm's does it say to shift at.

[JCz]

Originally Posted by ashah000

i have a 1998 eclipse gs, does anyone have a manual for that car, if so in the manual at what rpm's does it say to shift at.

depends on what yer doin.. runnin from the cops or cruisin down the road?

heh

[duckydsp]

I got that car.
1) If you want to cruise and save gas then shift at 3500
2) If you are trying to get somewhere quick then shift at 5000
3) If you are racing then shift at 6500

That's what I do and my car is still running.

[JoeWagon]

Don't drive according to what your manual says, and what your driving instructor says.. drive how you want, its america. shift low if you are cruising and shift high when you are escaping the law.

[Eclipser07]

Originally Posted by ashah000

i have a 1998 eclipse gs, does anyone have a manual for that car, if so in the manual at what rpm's does it say to shift at.

When you're driving there is no real time to be specific to do it around 3500 rpm is normal. But you should be able to feel it when you wanna shift. Crusin I"d say 3500 rpm, if you're in a hurry i'd say around 5000.. Jus my opinion tho

[EclipseRST]

Originally Posted by Eclipser07

Crusin I"d say 3500 rpm, if you're in a hurry i'd say around 5000.. Jus my opinion tho

isnt that what duckydsp just wrote???

[duckydsp]

Am I a trendsetter?Let's think about this. Anyways after a bit you will adjust to the car once you get used to it. My car on the other hand adjusted to me and likes to shift a bit higher. A lot depends on what you normally drive it at.

[Spectrum]

red on tach = shift

[NarutoRamen]

Originally Posted by Spectrum

red on tach = shift

Thats the funniest shit...I don't know y

[EclipseRST]

LOL

[duckydsp]

I just wanted to put another smilie with a sign. Why do we use smilies so much? Why don't we use pics more? Why is this thread still building when the question was answered a week ago? Why am I asking so many questions? Why ask why? Why hasn't Jerry Seinfeld been shot yet? Why are you still reading this? Why am I still typing this? OK this is getting annoying.

[ItsyBitsySpyder]

:::FYI shifting:::, since i have a special engine with special needs(2.4L) i have shift early(about 5000rpms) when i'm dragging. 1st to 5-5.5rpm, 2nd to 4.5-5k, 3rd to 4-4.5k, 4th to 4k, and go from there. look at some power charts or get your car dyno'ed and see where you make max HP and torque. this is mostly for draggin' from what i learned. oh yea for a launch for the wholeshot, keep the rpm's up where you make max torque.

[kjewer1]

The red line on the tach is where the factory determined the highest rpm should be, and has nothing to do with optimal shift points. And you need to know more than just your peak hp or torque. You need all of your gear ratios as well. The best time to shift, with out exception, is when you would be making more WHEEL torque in the next gear at the rpm it would drop to, than you are currently making at this rpm in this gear. And remember that wheel torque equals thrust when combined with tire rolling circumference. HP isnt used to figure out shift point, but higher HP generally means more torque at higher rpm (since HP is torque times rpm divided by 5252), and higher rpm torque means more time spent at higher torque multiplication of lower gears.

I made a spreadsheet in Excel where you can punch in your torque numbers off a dyno chart, and all your gear ratios, and it spits out the best shift point for each gear. Most trannies have fairly wide spacing anyway, and its almost always beneficial to take it to redline at least in teh lower gears. With the turbo 2G on stock turbo though, I went faster by shifting at 6k instead of 7k, by .5 seconds. But with such a tiny turbo, high rpm torque is almost non existant

[SpyderEclipseGst]

Originally Posted by 95 GSXracer

The red line on the tach is where the factory determined the highest rpm should be, and has nothing to do with optimal shift points. And you need to know more than just your peak hp or torque. You need all of your gear ratios as well. The best time to shift, with out exception, is when you would be making more WHEEL torque in the next gear at the rpm it would drop to, than you are currently making at this rpm in this gear. And remember that wheel torque equals thrust when combined with tire rolling circumference. HP isnt used to figure out shift point, but higher HP generally means more torque at higher rpm (since HP is torque times rpm divided by 5252), and higher rpm torque means more time spent at higher torque multiplication of lower gears.

I made a spreadsheet in Excel where you can punch in your torque numbers off a dyno chart, and all your gear ratios, and it spits out the best shift point for each gear. Most trannies have fairly wide spacing anyway, and its almost always beneficial to take it to redline at least in teh lower gears. With the turbo 2G on stock turbo though, I went faster by shifting at 6k instead of 7k, by .5 seconds. But with such a tiny turbo, high rpm torque is almost non existant

And with that note, ill thake those shifting points to the track tonight. Ill be doing my final runs without the 14b(just the t25). And kevin, see that little 1 under your P.M...? thats me....READ IT

[kjewer1]

Got it SInce youre going to the track, let me be more specific. Take 1st gear to 7k rpm, and each subsequent gear to 6k. If you are FWD chances are you cross the traps in third, so 2nd is your only other shift anyway. If you do get into third, do it at 6k as well. This was good for a repeatable and consistent 5 tenths in my car with an exhaust only. 15.0s to 14.5s. Better launching got me to 14.2 and race gas got me to 13.7. AWD naturally, but some reference points none the less. Good luck, and be sure to post how you do