I get what you are trying to say.
Let me rephrase, and tell me if I got it right.
At what gear will give me the fastest acceleration if I'm at a particular speed? (e.g. 30/50/70mph)
For example, what is the optimal gear, in terms of acceleration, should I be at for 30 mph.

It's tricky to answer because at times, you'll run out of revs way too quick. An obvious example, is downshifting such that the resulting RPM is at 8000.
Perhaps a rule of thumb is for the lower gears (1,2,3) you want to be at the bottom of vtec (e.g. 5800 rpm, where vtec engages) since you'll run out of revs quickly. At higher gears, you can afford to be at a higher rpm.


Don't mind the members that are giving you crap about shifting into first. You know now, lesson learned, and move forward.

Forgive me for the following, going to go 'grandfather on you':
The key to driving fast is to drive smoothly. This also lowers the rate of wear and tear on your car.
I learned the above at track-school, and really can't disagree with what was taught.

 

The most agressive downshift is from 6th gear all the way to 1st gear, you should try it sometime!
You will see that your engine internals want to be agressive aswel and eventually fly around.
Best results can be found from 100+ mph!

 

Your already on the verge of pushing it, no sense in being any more "aggressive". Especially so if your tuned with vtec down sub 4k-5k rpm where you have no risk of dropping out of your poweband.

 

You do realize you can do in excess of 40mph in first gear? I generally don't feel the need to downshift to first going anywhere over 20mph, but you can safely go more if you are smooth and deliberate, but there usually is no need unless there is that one damn tight corner you bog out of at the racetrack. A good tune usually resolves that issue though.

 

BS in this car. Learn how to operate your clutch, gas and transmission effectively and you wont have a problem.

 

I have downshifted into first at one or two autox's where there were sharp u-turn type elements. I assumed it was a little rough on the trans to do so, but it was certainly possible... like other said, just had to get the revs up.

 

actually, instead of being more aggressive with your downshifts, I would recommend being less aggressive after reading this thread. Smooth your transitions with a proper rev match if you're not already doing so and remember "Slow in, Fast Out."

 

I found going back to first gear, in anything but a very low powered car counterproductive.

I did try it on a track with the slowest hairpin in Oz, but I found it induced too much wheel spin to be a fast way out of the corner, & you held the gear for such a short time it didn't work anyway.

I tried it in a Morgan +4 which had only about 150 BHP, & an F2 Brabham, with about 220, & in both instances the stop watch said it was slower.

What did work, in most cars, was a short gentle dip of the clutch, just enough to allow a couple of thousand RPM of clutch slip. This did give better acceleration, a small measurable reduction in lap times. It probably also caused little more wear than a couple of racing changes, but I did not think the tenth of a second or so gained was worth it. It just felt bad mechanical practice to me.

 

Sounds like you need some track time with an instructor -- especially if you're relying solely on the speedo for shifting IMO.

If you're asking for help you really shouldn't insult those giving you info. Granted "never downshift into first" isn't quite right but that tends to be the case with the word never. It's very rare that you'll really need to downshift into first.

^ This. You probably don't need more aggressive shifting. It can be counterproductive if you don't have a good understanding and feel for vehicle dynamics. Again, get some track time with an instructor. We really don't want your next thread to be a crash thread.