Ok i just got home from a quick dyno session and must say I'm quite pleased with the results. I just installed a Vafc-2 last week and wanted to get on the dyno as soon as possible to see what kind of power I'm making.

First here's my setup:

B18C6 with following mods:
Mugen Air cleaner box
Spoon Iridium plugs
Spoon spark cables
Sard fuel pressure regulator
ST Corsa cam gears
Removed power steering
Power Enterprise timing belt
Hytech header and cat-back
Apexi Vafc-2

Cam gears set to +2, +2
Timing 17 degrees
VTEC crossover @ 4500


Here's the plot:

Green is power and Blue is torque, thin green and blue lines are the first run before any tuning. So i went from 183,7 to 196 peak Hp This is on a Dynapack dyno btw.



As you can see I got some nice gains, especially in the midrange and a nice rush of extra top end power. A/F is still tuned on the safe side, with 13,9:1 beeing the highest it got. I'm sure some more fine tuning could be done but this is what we had time for today before I had to go to work. Car felt much better afterwards so money well spent as i see it.


Modified by Pondus at 6:22 PM 12/8/2006

 

holy jumpy torque curve.. don't you want that thing a little more smooth..?

 

Take a look at the torque curve scaling

 

Is this Flywheel HP?
>200 HP ECE corrected at flywheel is what you should get with a B18C6 with I/H/E.

 

No, this is whp or hub hp as the dynapack bolts on to the wheel hubs.

 

Does it measure the drivetrain loss?

 

No, so i do not have the flywheel hp, it only measures at the hubs. What is the typical loss on a ITR? 10%? 15%?

 

No idea, every dyno gives a different drivetrain loss percentage. I don't know why....

 

well, it takes into account the loss routing the power through the tranny, and axles finally spinning the hubs, so there is a significant amount of drivetrain loss taken into account.

Only difference is the amount of power needed to accelerate the wheels.

So power figures are Crank > hubs > wheels

as to exact percentage, every dyno varies

 

Well, in Europe you can see whp figures as low as 140 whp with a 60 hp drivetrain loss on some dynos.
And in the US (dynojet) you'll see figures like 170 whp with only 30 hp loss.
That's a big difference.

 

Anyways I'm pleased with the results, it's nice to not have to redline it to be in VTEC in the next gear.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pondus &raquo;</TD></TR><TR><TD CLASS="quote">No, this is whp or hub hp as the dynapack bolts on to the wheel hubs.</TD></TR></TABLE>

Interesting. Since it bolts to the hubs, it lowers the amount of drivetrain loss considerably, as there will be no "weight of the wheel/tire mass" to rotate.

 

Try a vtec crossover of 3,500rpm, I know that it sounds unusually low, but trust me here.

Austin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pondus &raquo;</TD></TR><TR><TD CLASS="quote">No, so i do not have the flywheel hp, it only measures at the hubs. What is the typical loss on a ITR? 10%? 15%?</TD></TR></TABLE>

The Sun dyno i dynoed on a while back ago measured a staggering 22,82% drivetrainloss


Modified by Pompiuses at 11:52 AM 8/6/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pompiuses &raquo;</TD></TR><TR><TD CLASS="quote">

The Sun dyno i dynoed on a while back ago measured a staggering 22,82% drivetrainloss </TD></TR></TABLE>
Doesn't sound realistic to me. But it depends how they define it....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DutchITR1689 &raquo;</TD></TR><TR><TD CLASS="quote">
Doesn't sound realistic to me. But it depends how they define it....</TD></TR></TABLE>

Doesn't sound realistic to me either
I like the Dynojets best, their so kind

 

Yes it depend the roller size and weight.

I have dyno my R on a Rotronics with very large rollers, mods where only the Mugen air box: 118WHP and 192 Flywheel HP !
Note that the dynamometer is one of most sofisticated in Europe.

On a Softengine Dyno with all my actual mods: 180whp and 209.4 flywheel HP !
On a John Beam Dyno with same mods: 190whp and 208 flywheel HP !

I will dyno it next month on a Bosh FLA203, we will see.

 

pretty decent

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austin &raquo;</TD></TR><TR><TD CLASS="quote">Try a vtec crossover of 3,500rpm, I know that it sounds unusually low, but trust me here.

Austin</TD></TR></TABLE>

That may be interesting, to drive in VTEC constantly on a daily basis

Seriously though, we did try it at 4000 and it was even smoother than at 4500 but as this is my daily driver it's not such a good idea to go any lower than what we set it at.