i was wondering what is the highest rev (safe) wit a stock b16...

 

there is no point to rev past the stock redline, as the engine isnt going to be making any decent power up there.

 

highest rev on a stock b16 mt should be at 8300, but the motor stops makin MORE power at 7600, so try and shift around there but obviously you will hit at least 78-8k before you can shift.

 

i always wait until the tach just gets barried below 8 then shift, cause if you bring it to the limiter that will slow you down..dont shift around 7600 because it still pulls beyond that.

 

yes it does still pull, but is it efective? no, the max power of the STOCK motor peaks at 7600, so what reason is there to keep it in gear if your constantly loosing hp apose to making it by shifting gears?

 

to me it seems to be effective, because you have the RPM's up so when you go to 2nd it will still be screaming in vtec...

 

Exactly,
You don't want to shift so early that you can't take advantage of VTEC right away on the next shift.
The more hp you make in your total usable power-band the faster you will go. While your motor might make less power after the peak, it will be making a lot more than you would at low rpm (one of the b16's weaknesses) outside of your power-band.

 

He's right about 7600 RPM being the peak power. But you should take it to atleast 8k. I shift right at 8 on my 1st Gen and it pulls fine. Wouldn't go too much higher though, the less agressive cams on the 1st Gen don't like that.

 

see i wasnt thinkin about most of the people with b16's and i apologize for that, my vtec kicks in at 4600 (semi programed ecu combined with a vafc) so i wasnt thinking of the 5500 rpm (or i think thats what it is) vtec crossover for most people. so i was thinking more for my setup then his and that was wrong. so yeah rev it to about 8 like they said, the reason i say shift so low is because by the time you ACTTUALLY shift your rpm's would be alot higher then 7600 if thats where your tryin to shift, and if you wait to long you hit the limiter and that not good lol, sorry for the confusion.

 

7600 is the correct answer folks.. like most said there is no point in going over since that is when u get the max horse out of the car.

 

so if i was hittin the 1/4 mile and i shifted at 7600 one run then at 8000 the next..the 7600 run would be quicker?? i know it wouldnt be by much but still..what do you think

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by misfithamster &raquo;</TD></TR><TR><TD CLASS="quote">so if i was hittin the 1/4 mile and i shifted at 7600 one run then at 8000 the next..the 7600 run would be quicker?? i know it wouldnt be by much but still..what do you think</TD></TR></TABLE>

*sigh* People always feeding misinfo about our B16's...

It's best to shift at redline in every gear! I shift at 8000 every gear, and Raene shifts at 8000 every gear, and we run 14.8 and 14.4 respectively. It's all about keeping the engine in it's powerband.

 

Shifting all depends on your gearbox, and your power curve. With this noted you have to remember gearing affects the "theoretical power" put down to the pavement. So say you are running at 8 grand in 1st making say 130 HP and 100 Lb of torque at the crank, you would be accelerating more at the same speed than you would at say 6.5 grand in second, making very similar crank power figures. There is a term for the "theoretical power" which I cant remember at this moment. It has been disused many time on other boards. I am not saying at all that it is better for him to shift at 8 that at 7600, but you do also have to remember that you need to be shifting into power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sephiroth &raquo;</TD></TR><TR><TD CLASS="quote">7600 is the correct answer folks.. like most said there is no point in going over since that is when u get the max horse out of the car.</TD></TR></TABLE>

That's misleading. No offense, but it is. With an engine that makes all it's power at the top end, like a B16, it is important to shift after peak HP is reached. The theory is power under the curve:

Here is a stock B16 dyno chart to use as a working example:


You want to land higher up in the power band when you shift, that's part of what's going to work for you - making power between points A & B (purple color). With my transmission, shifting just before the 8200rpm rev limiter equates to about 5750rpm in the next gear. BUT, even when you shift past the point in the power band where you make maximum HP - say right before the rev limiter, you are still making the same power as you were at 7100rpm (with this graph) - again, relative to my tranny, shown by point C (orange color) below (or apx. 138 HP):


- versus shifting at 7600rpm - which with my transmission yeilds 5250rpm in the next gear - barely into VTEC for me with the stock PWO ECU, as shown by point D (red color) below, or apx. 90 HP:


So, as you can see, by shifting after peak power is made, you are still taking advantage of the most usable "power under the curve".


This topic has been covered many times in the Tech, Road Racing/Autocross, and Type R forums - as well as many other places if this peaks your interest.

 

yeah everyone i know slams at about 8000 but i guess if it works for that guy then what the hell
i love gettin the facts