Go Back   AstinaGT Forums > Performance & Technical > Performance & General Maintenance

Reply
 
Thread Tools Display Modes
Old 27-12-2006, 11:18 AM   #21
WAR-20B
Junior Member
 
WAR-20B's Avatar
 
Join Date: Nov 2006
Location: Sydney, Oz
Posts: 12
Send a message via ICQ to WAR-20B Send a message via MSN to WAR-20B
Quote:
Originally Posted by LordWorm
You can also remove the big fat bong shaped resonator.... i found a lid from a paint can, and electrical tape was perfect for plugging the hole on mine Ghetto ftw!
Not a very wise idea.

Ever heard of Helmholt resonance...?

AVOIDING this resonance is the reason why manufacturers use the resonator box.

When you remove it, you hear more induction noise. This is due to a coarser air flow into the AFM. The resonator smooths this air flow allowing more air down the pipe for its given diameter.

They are very common on NA cars especially in F1 where air speed along a pipe is critical.

Here is a web site to explain the technicalities of "that little box" > Here <

If you shorten the intake tract with (say) a pod filter, then you shift the resonant frequency up beyond the rev range so its not an issue.

However, if you keep the longer intake tract (standard pipe work) then the resonant frequency of that intake tract is lower & (usually) within the RPM range of the engine. Thus the need of the Helmholtz resonator to overcome it.

REgards
__________________
His car = JC Cosmo - 20B power

Her car = BJ Astina - SP20 power

Our crib= Streets of Sydney

My web= http://www.dmrh.com.au
WAR-20B is offline   Reply With Quote
Old 27-12-2006, 11:29 AM   #22
chicaboo
Senior Member
 
chicaboo's Avatar
 
Join Date: Sep 2004
Location: Logan prefecture
Car: Scooter
Posts: 7,585
Not a very wise idea?

Ever heard of a panel air filter...?

It creates all sorts of air upsets, far above and beyond any that which you will encounter in the stock or modified air intake ahead of it.

Point of case is: Everything you said doesn't matter except for the noise part, as the panel filter shapes the air into the MAF anyhow. People modify this air intake not because they are worried about noise, but to increase the airflow into the stock airbox. That is their main concern, not Helmholtz resonance.

Gav.
chicaboo is offline   Reply With Quote
Old 27-12-2006, 11:29 AM   #23
LordWorm
Senior Member
 
Join Date: Feb 2006
Location: .
Car: .
Posts: 1,689
Quote:
Originally Posted by WAR-20B
Not a very wise idea.

Ever heard of Helmholt resonance...?

AVOIDING this resonance is the reason why manufacturers use the resonator box.

When you remove it, you hear more induction noise. This is due to a coarser air flow into the AFM. The resonator smooths this air flow allowing more air down the pipe for its given diameter.

They are very common on NA cars especially in F1 where air speed along a pipe is critical.

Here is a web site to explain the technicalities of "that little box" > Here <

If you shorten the intake tract with (say) a pod filter, then you shift the resonant frequency up beyond the rev range so its not an issue.

However, if you keep the longer intake tract (standard pipe work) then the resonant frequency of that intake tract is lower & (usually) within the RPM range of the engine. Thus the need of the Helmholtz resonator to overcome it.

REgards
Proven additional mile an hour at the track - which is a good indication of an increase in power.

Crack it open and hav a look at it, its NOT going to smooth out the airflow in a pink fit. no way known. It is a massive restriction. Don't believe me? shove it on a flow bench.

Yes it makes your intake more noisey. By removing it you are making the intake tract shorter. considerably shorter.

Smooth air flow is also *impossible* to achieve on our standard pipe work. Beyond the airbox, it goes through a corigated pipe.

Stripping resonators out of cars for cheap/free power has been done for ages, and is a proven way to gain a bit of extra throttle response and maybe a small hit of power.

I have removed the resonator, and am making more power. Be that because the pipe work is shorter, more direct and less turbulent, or because the pipework is shorter and thus the air doesn't have as much time to heat up, or a combination of both, its definantly given a noticable gain.
__________________

Need parts? Contact sales@b3motorsports.com
LordWorm is offline   Reply With Quote
Old 27-12-2006, 05:40 PM   #24
Melbastina
AstinaGT Regular
 
Melbastina's Avatar
 
Join Date: Jun 2005
Location: Nth Fitzroy, Melbourne
Posts: 306
Send a message via MSN to Melbastina
Anybody got pics on how to do this mod?

__________________
BJ Astina (Shades pack) stock other than the K&N Panel Filter, Tint, Fog Lights, Clarion fronts, Alpine rears, scuff plates, clear side indicators, VisionPlus and silver vision globes.
Melbastina is offline   Reply With Quote
Old 27-12-2006, 05:42 PM   #25
LordWorm
Senior Member
 
Join Date: Feb 2006
Location: .
Car: .
Posts: 1,689
Quote:
Originally Posted by Melbastina
Anybody got pics on how to do this mod?

Next time i've got the intake off i'll show pics of it in pieces...but its pretty easy to work out without photos....just remove the bong :P
__________________

Need parts? Contact sales@b3motorsports.com
LordWorm is offline   Reply With Quote
Old 27-12-2006, 08:14 PM   #26
Melbastina
AstinaGT Regular
 
Melbastina's Avatar
 
Join Date: Jun 2005
Location: Nth Fitzroy, Melbourne
Posts: 306
Send a message via MSN to Melbastina
Quote:
Originally Posted by LordWorm
Next time i've got the intake off i'll show pics of it in pieces...but its pretty easy to work out without photos....just remove the bong :P
Nah, I'm a real dumb ass with car mods, got NFI just ask Gav...
__________________
BJ Astina (Shades pack) stock other than the K&N Panel Filter, Tint, Fog Lights, Clarion fronts, Alpine rears, scuff plates, clear side indicators, VisionPlus and silver vision globes.
Melbastina is offline   Reply With Quote
Old 02-01-2007, 06:38 AM   #27
DB0984
Boostin Member
 
DB0984's Avatar
 
Join Date: Oct 2004
Location: Canberra
Car: ????
Posts: 154
Send a message via MSN to DB0984
Front grill has been drilled out at the top left corner.


Top of the grill has been cut out to provide better aire flow to the snorkel.


Underneath the air filter box and hanging of the right angle bend is the resinator.



Hope this helps some people
__________________

94 Ford Laser XL - Trent
03 Mazda Astina SP20 - Sam
06 Mazda 3 MPS - Miff


Now happily boostin
DB0984 is offline   Reply With Quote
Old 02-01-2007, 07:34 AM   #28
Melbastina
AstinaGT Regular
 
Melbastina's Avatar
 
Join Date: Jun 2005
Location: Nth Fitzroy, Melbourne
Posts: 306
Send a message via MSN to Melbastina
Yeah, it does help, thanks!

Did you notice much of a change (and how much I guess)?

Now wheres my drill???
__________________
BJ Astina (Shades pack) stock other than the K&N Panel Filter, Tint, Fog Lights, Clarion fronts, Alpine rears, scuff plates, clear side indicators, VisionPlus and silver vision globes.
Melbastina is offline   Reply With Quote
Old 02-01-2007, 08:12 AM   #29
spedwards
Junior Member
 
spedwards's Avatar
 
Join Date: Dec 2006
Location: Sydney
Car: SP20 & MPS
Posts: 131
Send a message via MSN to spedwards
The pics are awesome, thanks!
spedwards is offline   Reply With Quote
Old 02-01-2007, 12:21 PM   #30
DB0984
Boostin Member
 
DB0984's Avatar
 
Join Date: Oct 2004
Location: Canberra
Car: ????
Posts: 154
Send a message via MSN to DB0984
the throttle response is a bit better, and revs cleaner in 2nd and 3rd.
__________________

94 Ford Laser XL - Trent
03 Mazda Astina SP20 - Sam
06 Mazda 3 MPS - Miff


Now happily boostin
DB0984 is offline   Reply With Quote
Old 02-01-2007, 01:11 PM   #31
LordWorm
Senior Member
 
Join Date: Feb 2006
Location: .
Car: .
Posts: 1,689
Yeh.... should sound a bit chunkier too.... free mod - free power....you can't complain really
__________________

Need parts? Contact sales@b3motorsports.com
LordWorm is offline   Reply With Quote
Old 02-01-2007, 01:14 PM   #32
chicaboo
Senior Member
 
chicaboo's Avatar
 
Join Date: Sep 2004
Location: Logan prefecture
Car: Scooter
Posts: 7,585
Your improvement in fuel economy is what you'll notice most. PPL with AutoEXE grills like blacksp20 and orion should've noticed similar gains also.

Gav.
chicaboo is offline   Reply With Quote
Old 02-01-2007, 01:18 PM   #33
spedwards
Junior Member
 
spedwards's Avatar
 
Join Date: Dec 2006
Location: Sydney
Car: SP20 & MPS
Posts: 131
Send a message via MSN to spedwards
How did you get such a neat finish DB0984 - rough cut and then sand back as required?
spedwards is offline   Reply With Quote
Old 02-01-2007, 01:29 PM   #34
Melbastina
AstinaGT Regular
 
Melbastina's Avatar
 
Join Date: Jun 2005
Location: Nth Fitzroy, Melbourne
Posts: 306
Send a message via MSN to Melbastina
Quote:
Originally Posted by spedwards
How did you get such a neat finish DB0984 - rough cut and then sand back as required?
I was just thinking that, I dont have a dremel or anything so wondering what the best way to cut it out will be, went and had a look at the car and the plastic seems a bit thick for a stanley knife.
__________________
BJ Astina (Shades pack) stock other than the K&N Panel Filter, Tint, Fog Lights, Clarion fronts, Alpine rears, scuff plates, clear side indicators, VisionPlus and silver vision globes.
Melbastina is offline   Reply With Quote
Old 02-01-2007, 01:49 PM   #35
LordWorm
Senior Member
 
Join Date: Feb 2006
Location: .
Car: .
Posts: 1,689
I used a dremel on mine....and its a bit messy on the inside....just drill it out, and use rats tail files to get it nice.....gotta say, DB0984's setup looks great - far neater than mine
__________________

Need parts? Contact sales@b3motorsports.com
LordWorm is offline   Reply With Quote
Old 02-01-2007, 04:03 PM   #36
Melbastina
AstinaGT Regular
 
Melbastina's Avatar
 
Join Date: Jun 2005
Location: Nth Fitzroy, Melbourne
Posts: 306
Send a message via MSN to Melbastina
Right, got the grille off my car now to find a way to cut it, might have to wait til tomoz when I can get my hands on some tools.
__________________
BJ Astina (Shades pack) stock other than the K&N Panel Filter, Tint, Fog Lights, Clarion fronts, Alpine rears, scuff plates, clear side indicators, VisionPlus and silver vision globes.
Melbastina is offline   Reply With Quote
Old 02-01-2007, 04:45 PM   #37
DB0984
Boostin Member
 
DB0984's Avatar
 
Join Date: Oct 2004
Location: Canberra
Car: ????
Posts: 154
Send a message via MSN to DB0984
Mine's not all that neat if you look at it up close. I used a drill and a hacksaw blade. helps if you have a handle for the blade, but if you dont just put some electrical tape around the end you will be holding onto.

Took me about 2 hours to do both mods to the grill, and about half an hour for the resinator.
__________________

94 Ford Laser XL - Trent
03 Mazda Astina SP20 - Sam
06 Mazda 3 MPS - Miff


Now happily boostin
DB0984 is offline   Reply With Quote
Old 02-01-2007, 05:42 PM   #38
arden
Senior Member
 
arden's Avatar
 
Join Date: Mar 2003
Location: Sydney
Car: Suby
Posts: 1,280
Quote:
Originally Posted by Melbastina
I was just thinking that, I dont have a dremel or anything so wondering what the best way to cut it out will be, went and had a look at the car and the plastic seems a bit thick for a stanley knife.
i hacked the top part of my grill with a stanley knife.
must admit it was hard work but not impossible...mine ended up pretty neat too.
__________________
arden is offline   Reply With Quote
Old 02-01-2007, 05:55 PM   #39
DB0984
Boostin Member
 
DB0984's Avatar
 
Join Date: Oct 2004
Location: Canberra
Car: ????
Posts: 154
Send a message via MSN to DB0984
i have now ordered a hiclone and will see if this helps with the fuel consumption issue, it will hopefully give a bit more power aswell. I will let you guys know how it goes.
__________________

94 Ford Laser XL - Trent
03 Mazda Astina SP20 - Sam
06 Mazda 3 MPS - Miff


Now happily boostin
DB0984 is offline   Reply With Quote
Old 02-01-2007, 05:55 PM   #40
LordWorm
Senior Member
 
Join Date: Feb 2006
Location: .
Car: .
Posts: 1,689
Mine was dremeled out first (cut along the bottom) then belted out with a screwdriver and hammer
then rats tail filed back to semi-neat

in retrospect i'm damned lucky i didnt break the thing

drill it then file it, thats how i'd do it if i were to have to do it again
__________________

Need parts? Contact sales@b3motorsports.com
LordWorm is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS : [SYD] Simota Cold Air Intake - SP20 arden For Sale/Wanted 4 15-05-2006 08:24 PM
WTB: [QLD] SP20 or Jspec Intake cam chicaboo For Sale/Wanted 3 09-12-2004 06:32 PM
dba brake rotors - sp20 twilightprotege Performance & General Maintenance 50 23-08-2004 01:38 PM
SP20 VS SP23 WASP20 General Automotive Talk 10 15-03-2004 11:38 PM
SP20 Custom Polished Cold Air Intake wiredone For Sale/Wanted 0 04-10-2003 08:35 PM


All times are GMT +10. The time now is 11:47 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
2001- 2010 AstinaGT