Stock R motor and ECU...

How many RPM do you drop?

Indicated RPM?

&

Actual RPM?

I never really paid attention and I can't remember.


Thanks in advance,


A.

 

Like, how far does it drop when it bounces off the limiter? Im confused.

 

rev-limit is 8600 if thats what your asking

 

I tested this today to see where my rpm dropped to from 1st shifting to 2nd hitting 8,400.

It dropped to 7,200+ . My tires spinned badly though. It's gonna be hard being acurate at judging from 1st to 2nd when you don't get traction...

I'll test it in 2,3, and 4 later.

My engine is in a civic.. is this about where everyone with ITR's is dropping to doing 1st to 2nd?

 

Whoops.. I'm slightly non-stock. CAI/Exhaust/kenji P28

 

BINGO!!!

How many RPM does it drop immediately after it hits the revlimit?

Indicated and Actual?

Is it like 50, 100, 150 or 200 or more RPM?

Stock motor and ECU...


A.

 

No thanks, I already know where it falls after a shift... I mean when you bang the revlimit... How many RPM does it drop or retard to?

A.

 

i cant remember correctly but i think its around 200rpm

 

hmm.. I'm confused.

 

Ok so bear with me here...

NOW we're Under race circumstances where you use every last ounce or ml of everything to win... Totally stock still:

How much does the RPM fall during a Good, Really Good to Perfect shift?

Theoretically could you be as fast or faster shifting just as the Revlimit bangs you back a few RPM?

Or would that continual ECU controlled starvation of the fuel produce too many or major problems?

Of course perfect shifting is what everyone strives for but, could you rely more on the revlilmit? Or is that just a totally bad idea?


Just curious since some revlimits are more friendly than others in different cars.

A.

 

I have heard hitting the revlimit ocassionally is OK but for extended periods it can cause problems on our DC2's. Personally i shift just before rev limit, because i feel it still has enough juice and the OEM tach is off...are we talking about drag conditions?...if so im not sure but on the circuit i hold a certain gear right before limit in which for most ocassions it's third gear at an 'indicated' and i enforce indicated at 8900rpms.

as for drag i only hit the first 2 gears at cutoff and on third i dont go all the way to cutoff as it feels as though the car is just free revving on no power is induced....this is for a stock as a rock engine...but for a modified one i tend to aim for just before cutoff as my butt dyno says its still got juice.

hope that helped a little..

 

hitting rev limiter, of fuel cuttof isn't a good thing, especially while at 8500rpm, i would think hitting the rev limiter only slows you down, i raised my redline to 9K and haven't hit the rev limiter since.

as far as rpm drop due to fuel cuttof, its same thing as shifting late, the longer you stay in that gear whether due to fuel cuttof or in neutral or just light on gas pedal, speed keeps dropping unless upshifting.

 

Never really paid much attention either but from just remembering the sounds of the engine and the frequency at which the fuel cut on and off I would guess no more then 100 or 200 rpm. Of course the frequency of the cut off is going to be higher the lower the gear is, I never hit the rev limiter in fifth gear where the variation of rpm would be more noticable.


About your other post I beleive that shifting just before (a few 100 rpm) hitting the rev limiter would be preferable then hitting the rev limiter for a "limited" period of time as this will stop your acceleration for a breif moment.


[Modified by JPP, 9:26 PM 12/1/2002]

 

noo you're not going to have little jolts of acceleration from bouncing off it


[Modified by TypeR 599, 7:05 PM 12/1/2002]

 

I understand that...

But, you never answered the origional post.


A.

 

Hitting the rev limiter is slower than shifting just before it. The fuel cutoff lasts longer than a 'good or excellent' shift does. So, you can't get on the throttle as quickly after bouncing the rev limiter as you can on a clean shift. Try it, you'll quickly notice that going as close as possible to the rev limiter without actually bouncing off of it (and the fuel cutoff) is much faster.

There's no benefit to be had by bouncing off the rev limiter in hopes to shift faster, if that is what you are asking.

 

I believe this as well, just want to see what others say, and that I just finished watching a Best Motoring Vid and noticed some of the hand and foot work and noticed some goof ups and slips...

I also wonder where the best point is to set a shift light? How fast can you react?


I guess those are questions for another post though.

Thanks again,


A.

 

Shift light? who needs that?

I go by the sound more than anything. After hitting the rev limiter a few times, I came to find that honing in on the engine sound was easier than looking down at the rpms.... although it seems I can begin my shift when the guage 'shows' 8750 or so rpm. very inexact science, i know.

I'm really not sure what you would set a shift light at, i have no idea what kind of reaction times are possible.

 

A, this has alot to do with the weight of your flywheel, and other things (inertia based).

but for a stock itr, i think it was about 200 rpm. I was doing it down the big straight at limerock


[Modified by Soup ****, 5:57 AM 12/2/2002]