Velocity stacks = more power, now which to get?

[Petros AE86]

what the mods of your engine??

[mech5107]

rooty Wrote:

mech5107 Wrote:Don't forget that on a dyno, the hood is open and the stacks suck in clean and cold air.
On the road, the stacks will suck hot and dirty (oil mist, etc). So the real power will differ.

Why would you do that on a dyno? That's what the blower is for. In real life, you drive without it?

Do what? Don't have plenum? In road driving, the cold air will go through the rad and get hotter. Also the air will then get "trapped" under the hood and get hot from the engine.
If with closed hood the itbs draw cold air, then all the engine bay should be cold...

[rooty]

mech5107 Wrote:Do what? Don't have plenum? In road driving, the cold air will go through the rad and get hotter. Also the air will then get "trapped" under the hood and get hot from the engine.
If with closed hood the itbs draw cold air, then all the engine bay should be cold...

I'm questioning a dyno with an open hood. Kind of pointless if you want real-life accurate results

[Bean]

your plenum is to small - the basic design doesn't look too bad

from the pic I can see two issues, one too small; second the plenum roof at the 4th stack is most probably too close unless your stacks a very short...

you could try to increase the plenum on the lower end and feed the air through there, this has two advantages, the first stack won't be force fed as much and you gain more volume.

PS: I agree a dyno run with an open hood is as realistic as oem figures...

probably one of the best dyno setups I've ever seen is this one

based in the Neatherlands close to the German/Belgium border

[4000GT]

Petros AE86 Wrote:what the mods of your engine??

38mm 4 into 1, 650mm long headers
1mm oversized valves (intake and exhaust)
Supertech valves springs
288 degree 10mm lift cams
Toda Cam gears
Custom narrow skirt CP pistons
Tomei rods
ARP bolts throughout
ACL bearings
Excedy lightweight flywheel
15:1 compression
Balanced
Vipec ECU
Coil on plug ignition

[jondee86]

Good to see the DynaPack hub dyno... designed and built right here
in New Zealand

EDIT: Am I the only one who can't see the pics in the link given by
the original poster ?? That's why I am posting the links up again.

EDIT: Deleted the pic... no need to post it twice

Cheers... jondee86

[Bean]

jondee86 Wrote:Good to see the DynaPak hub dyno... designed and built right here
in New Zealand

EDIT: Am I the only one who can't see the pics in the link given by
the original poster ?? That's why I am posting the links up again.

Cheers... jondee86

fixed the link, don't know what wasn't good but it works now

Dynapack is my personal favorite - I almost bought one before I decided to live a life all over the world. The value and quality is awesome and being more portable than most conventional dynos offers a lot of opportunity to regain the investment.

[Uzelac]

OT:
What is the approximate price of Dynapack setup like this one ?

[Bean]

well Dynapack is only the Dynamometer - the fan setup in the picture above is a custom build.

If you are on a budget the tend to have test and refurbished systems all the time. So you're looking for around 30-40kUS$ for the smallest 2WD setup which is good for around 400hp

send me your E-Mail through PM and I'will forward the information I have - they are from March 2010 so prices are slightly higher as they got cheaper by now. Or contact them yourself http://www.dynapack.com

PS: for what I had planed back in 2010 - I would have had the investment easily back within a year.

[Uzelac]

Update ?
Airbox or just stacks ?
I'm interested because I plan to put some some box over my ITB's.