i shift at 7500. the rpms don't get a chance to drop out of the powerband on the shift. short shift if you like but i think rev it to 7800, especially if you have a tune, thats supposed to give you more power up there. the tuners tell you its safe. personally i wouldn't do it because they make that power by leaning the af mix. and if for any reason the af goes even leaner you could be in trouble. i like the super rich mitsubishi tune because I can bang it off the rev limiter and drive it hard without worrying about burnt pistons. unfounded fear? maybe. but peace of mind when Im rockin the autox course at 7500 lets me land 1st place and start the porsche guys wondering how they got beat. by an evo sans tune.

 

Your engine will save,but the turbo can't support the flow,so optimal shift point for stock turbo car will bw ~7300rpm.

 

I shift at 7200. I can also go up to 7800 but that is for the drag strip. Al made it clear on previous post that you shouldnt take it that high everyday. It's there so if you at the track you dont have to shift to 4th.

 

It all depends on where your powerband is and how wide it is. Your gear ratio and rev at which you shift determines where you come in on the next gear.

can't remember exact evo numbers, but if you just take a few imaginary gear ratios:

"1st" - 50mph@7,000rpm
"2nd" - 100mph@7,000rpm
"3rd" - 150mph@7,000rpm

Then if you shift at 7k:
1st from 0-50 and 0-7,000
2nd from 50-100 and 3,500-7,000
3rd from 100-150 and 4,666.7-7,000 (presumably)

If you shift at 10,000rpm out of first you'd be doing (10/7)x50 = 71mph and this gets you into second at 4,970rpm. Get to 10,000rpm then shift again gets you into 3rd at 6,666.7rpm. So:
1st from 0-71 and 0-10,000
2nd from 71-143 and 4,970-10,000
3rd from 143-171 and 6,667-10,000

It's clear that shifting later uses (obviously) a higher part of your rev range and also it uses a wider range of revs. If your engine only produces usable power around 5k and up then the second case is preferrable but only if you're making some useful power also up to 10k. Also, it allows you to stay in the same gear and your foot on the throttle for longer without shifting which saves you time.

Anyway, I wouldn't do it too much. The forces on your engine components go up as the revs squared (pretty much). (7.8/7)^2 = 1.24 - that's 24% more load at 7.8k

On a more evo-specific note, your engine performance at these high revs is probably not all that great, unless of course you the components and tune for it.

 

i always end up seeing evo street racing stories where people say they were revving all the way up to 7.5 or 7.8 grand and i always explain to them this and yet some of them never believe me.

 

i think it has quite a lot to do with those civics that need to be raped up to 9.5k+ to make any useful power. so people associate higher revs with higher performance. which is both right and wrong.

 

i do 7500rpm shift with 264 cams at the strip! but the power really falls off quick at those high rpms! dont really see a point to shift pass 7k if u have stock cams and turbo.

 

^you might have a different opinion on that once your 280's are installed. not long to go...

 

going past 7200-7300 with stock turbo/cams is worthless. Even with cams 7600 should be the absolute highest and even then depending on your power curve you might be losing out by just shifting earlier. My rev limit is set to 7900 but that is just for going ***** out in 4th gear on the street.

 

With a good tune and some basic mods you can make peak power at or near redline. Cams will do this for you. I shift(or at least try to) at 7500.

 

if you look at yoru dynogragh you're about 30whp lower at 7.5 than you are at 6.5

just something to think about

 

Just a guess.. but I think you are better off getting your car dynoed to better answer that question.

Every car is different so the powerband is shifted differently. With a dynograph, you can tell where you power drops off.

my 2 cent

 

What many fail to understand that the car will feel different from gear to gear. For example, you might have better power band on 3rd gear at 7200 RPM than second gear at the same RPM. Its how the car feels, also every Evo is different even in stock configuration. Your best bet is to develop a feeling for the car to know when is the best time to shift.

For example, on road course race I shift depending on the optimum feeling of the car. On some gears I have to shift earlier and some I can hold the power longer.

My 9 is stock completely and I think the optimum shifting point is around ~7200 RPM. However, I rarely shift at that point or even that high because the margin of power gain is minimal and I am not going to set a record.

In the end see at what point you can make the car happy and at what point of shifting you feel comfortable with.

 

interesting points. i usually shift between 7200-7300. when i was at the track i was shifting at about 7500 and managed to run several 12.7's@110.

 

no need yo rev it so high, your not driving a honda where you need rpm to make power....use the turbo shift at like 7100, it drops right back down into power.....