How to Accelerate?

[thebrad]

Originally Posted by Vince-HX

A tuner informed me that honda's dont go into open loop unless throttle is over 90% and rpms are high enough.

I accel @ 0-1 in vacuum (about 75%) and always pulse from 1500-2000 rpm. This has given me high 60's in city driving.

Ha, I shift at 1500.

[Daox]

Shifting sooner is not necessarily better. It depends on the engine. Most engines are more fuel efficient around 2500 rpm.

[pumafeet10]

Vince- i was hoping to hear from you, there was a post recently on ht where you had talked about your experiences and then seeing your employment with full race had the wheels turning wondering if you and the guys there had any crazy new parts that you have fabricated. I also seem to be folowing your recipe for my acceleration as well with the pulse and glide, sadly i don't regularly commute in my hatch so i haven't been able to hone my skills on a daily basis

[Vince-HX]

based on that most efficient mean piston speed formula my optimal shift points are between 2000-2500.

2000 works for me, I still have a pretty good accel rate and that style of driving corresponds pretty well with my factory shift light.

[thebrad]

Originally Posted by Daox

Shifting sooner is not necessarily better. It depends on the engine. Most engines are more fuel efficient around 2500 rpm.

It's pretty much ingrained in the way I drive, plus it lines up with the shift values recommended in the owners manual.

[Vince-HX]

Originally Posted by pumafeet10

Vince- i was hoping to hear from you, there was a post recently on ht where you had talked about your experiences and then seeing your employment with full race had the wheels turning wondering if you and the guys there had any crazy new parts that you have fabricated. I also seem to be folowing your recipe for my acceleration as well with the pulse and glide, sadly i don't regularly commute in my hatch so i haven't been able to hone my skills on a daily basis

We always have crazy new parts and ideas

Its great working @ a fab shop like Full Race. I have access to some of the best tooling available and some of the smartest engineers I know. The best part is that the bossman is all for trying out new ideas and combining power with FE. I'm very lucky to say the least.

And trust me, ideas are flowing

here is a little teaser - Ive made a device that has low 50 degree output temps without the use of a AC compressor

[pumafeet10]

well seeing the quality of work and your somewhat seemingly quick results speak for themselves which pair that with you have a civic very similar to mine makes me follow most of the stuff that you are doing. And any new stuff you need a guinea pig for or someone to do trial and error with im all for it. Im trying to understand more of the science behind how our motors work but its hard to keep up sometimes.

I will say keep up the awesome work , and let me know when you get the contraption for cooling ready i want a piece of that!

[bbjsw10]

Originally Posted by Daox

I aim to always (regardless of speed) accelerate at around 80% load

What do you mean by 80% load? I am just learning on this. How do you figure load %'s?

[tasdrouille]

Originally Posted by bbjsw10

What do you mean by 80% load? I am just learning on this. How do you figure load %'s?

You get it from the scangauge. AFAIK it's the percentage of total available power (or is it torque?) for any given rpm you are currently using. Imagine the power curve in your head, the load is where you are in relation to the power curve (which is 100%).

[pumafeet10]

which as posted above pretty means where you are closest to your optimum bsfc, i think thats correct. Also you can find out the load on you engine with a scangauge or using a vaccuum gauge