Well, i figured i post this here since i usually hang around the tech forum.
I finally got my b17 dyno'ed; im very pleased with the results, way more than i expected.

car: 94 integra
tranny: S4C
Motor: 170k b17, i re-sized and replaced the bearings. Rings are in good shape.
DIY intake, some header and a ''motorcycle'' exhaust
i tuned it a lil on the wideband beforehand, but i think i can skeeze maybe 5 more hp.
played with timing a little.



and torque curve:



well, i think that i can keep the top end from falling so fast if i add timing up a lil on that area, after peak.
move vtec to around 5300-5400 or maybe i just leave it like that cause i like to hear the MaDZ vetec atack.lol
Af ratio according to the wideband is pretty much good, lean it out at top end a little.

from 2400rpms up to about 4300 rpms AF is pretty flat around 13.3-13.6
at 4300 it starts to get a little leaner from 13.4 to about 13.9 at 5400 rpms
a little lean dip at vtec x-over (14.4)
after that goes from 13.8 right after x-over to about 13.0 at 6900 rpms
from 6900 it richens up from 13.1 to 12.3 at about 8k.
Im trying to post the Af graph from the zeitronix

thoughts?


Modified by mmuller at 2:05 PM 4/22/2005


Modified by mmuller at 11:08 AM 4/9/2007

 

Change your vtec x over to 5200, your power will be seamless with no large jumps. Try and lean it out a little more in the top end and you should find some more power. Other than that it looks good

 

Holy healthy B17 batman!

 

nice numbers....

 

That is one healthy engine.

 

thanks for the reply's, i was kinda surprised myself;
i was thinking about backing off timing a little to keep the torque going for a little longer, lean out the top end a 1/2 point or so.
freak motor.

Does anybody have the calculation to get intake resonance in regards of pipe lenght?
im thinking that hop in power about 4400 is the ''sweet'' spot of the intake.
more ideas?
im making an excel chart with the A/F for some more criticism

 

is this a stock B17? if not, what cams & pistons are you runnin?

 

stock cams and stock pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">Does anybody have the calculation to get intake resonance in regards of pipe lenght?</TD></TR></TABLE>

Anything like this?

http://www.bgsoflex.com/intakeln.html

Most excellent dyno too. Where did you get that done at?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">Anything like this?

http://www.bgsoflex.com/intakeln.html

Most excellent dyno too. Where did you get that done at?</TD></TR></TABLE>

cool link!
but thats for intake runners; im looking for something that i can calculate resonance of the intake piping using i guess diameter and lenght of the pipe

 

Its usually accepted that if you want to raise the torque peak, you deduct 1.7ft off the intake pipe length for every 1000rpm that you want to raise it, and add length for the inverse effect.

I couldn't find much about intake resonance in regards to pipe size, just flow velocity. I don't know if this is what you wanted to calculate using intake resonance, but I thought I'd share.

 

That length would vary with the diameter of the piping though, as the velocity of the air would be less with a larger diameter of pipe. That rule of thumb might work for a certain size of pipe, say 2.5", but anything else would be a different length.

Try googling for tube resonance or similar?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">That length would vary with the diameter of the piping though, as the velocity of the air would be less with a larger diameter of pipe. That rule of thumb might work for a certain size of pipe, say 2.5", but anything else would be a different length.

Try googling for tube resonance or similar?</TD></TR></TABLE>

Yes, your right. I just assumed it was given that the piping size would have to be consistent. I believe the formula works for any size of piping, but Im referring to 3''.

 

Well with a different size of pipe, the velocity would be different, so the time delta between the originating wave and the reflected wave would be different. This would affect the RPM range the waves lined up. So the length to change the RPM by 1000 will be shorter.

 

nice numbers . post up your dyno sheet after you lower the vtech crossover and and lean it out of top. I'm curious to see.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">Well with a different size of pipe, the velocity would be different, so the time delta between the originating wave and the reflected wave would be different. This would affect the RPM range the waves lined up. So the length to change the RPM by 1000 will be shorter.</TD></TR></TABLE>

True. I thought what I read was in regards to flow velocity, not intake resonance. I will double check, though. I understand what you're saying, Im just not sure if thats where the article was headed or not.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">im looking for something that i can calculate resonance of the intake piping using i guess diameter and lenght of the pipe</TD></TR></TABLE>

Ask and ye shall recieve:

http://www.engineersedge.com/e...e.htm

Towards the bottom on the left.

 

thanks for the link drdisco; havent posted in theis thread cause i have been researching tube resonance and the way it works.
found a couple of good links that i will post up after i get this all figured out and ready for a mini explanation.
anybody wanna chime in this matter?