dyno

paying attention to the image below you'll find an unusual Y-pipe:

- first, it is not plastic but metallic
- secondly, ducts are much more pronounced than stock




.. so, finally discovered what is the so called " intake duct modification" that tuner MKB offers with his first stage mod, yielding 540hp crank, in combination with Ecu tune only.

note: the above pic shows the full kit inclusive of the throttle body mod that is, indeed, part of a further, different stage.

as all higher rated ecu tunes here give about 530hp, while this one gives 540 ( and I have no reason to doubt it ..)
... means this special Y-pipe design is worth at least 10hp.

Indeed there is more than one german tuner saying that this Ypipe is worth even more


the following cut&paste job gives an immediate comparo with Stock and CFairbox



just wanted to share with you opinions ...

Yacht Master

Looks like the same OEM air box hoses, but the Y pipe dose look like it may flow better and may be necessary for a larger throttle body.
The SC housing has been worked over the casting numbers are gone on the MKB.

TopGun32

metal y pipe holds more heat.. hotter air.. higher IAT's..

I'm currently experimenting with a few intake mods like the one made by Code3.

The C32 have enjoyed a simple filter additon to the C32 Y pipe made by Code3.

It yields .5 lbs of additional boost and makes more power without ECU. However the C32 does not have boost regulating valve which enables it to keep the additional psi.

Our E55's do have a regulating valve (waste blowoff) and in my case with ASP pulley.. I'm not really making more HP but only torque at the lower revs. All the additional PSI is leaked by the DME and thus not making addtional power.

A good intake mod will help with throttle response no doubt.

dyno

as you see below, they swap the TB only for Stage IV, while the intake mod is in since Stage I ... therefore should be the same .. don't think they make 2 different sizes




Cast Numbers gone ... maybe insiders at casting plant

.. can't see what's more behind the Y pipe: a cable and maybe something else?

there should be a serious reason if they took that way: make a special mould for an apparently neglectable Y-pipe !

...need the view from a flow-dynamics expert ...

dyno

this is exactly the point, ....the result obtained by Code3 by simply opening the intake immediately after the TB is confusing me : but don't remember exactly if Code3 gained more in the mid or top range
If dynamics means something the MKB special design should work for top range ...
Maybe this is also a reason why the CF airbox hardly showed any result ..

TopGun32

for one.. the extra intake produces more PSI from the kompressor.. and the C32 do not have a waste gate or blowoff valve like the E55. We don't have a blowoff valve like turbo cars but our system dumps any extra PSI if it recognizes extra air in coming in.

One reason the ECU tuning is necessary to control that valve.

The c32 engine only has the magnetic clutch to control PSI. 55k cars have both.. magnetic clutch and waste valve.. which is an over kill.

Can an intake mod yield 10HP with ECU.. no problem if it produces more PSI on the kompressor.

dyno

.. yes, I know the issue concerning the by-pass valve in 55K engines

and it is the first thing to be fooled when tuning the Ecu

fact is that Ecu tune, including by-pass valve management optimization, yields max 520-530HP ... while the same + a fancy Y-pipe = 540 ,with stock filters!

germankars

well
if you really want to start messing with throttle bodies,
why not just do what alot of the racing and drag guys do,
the newer trend is to have seperate throttle bodies for either

each cylinder, or at least each bank

Ive seen it on alot of cars lately, and it makes lots of zoom zoom

I saw it on a BMW, and a 350Z and both were pushing 650 hp..

as long as your in there, you may as well, lol do it right

lots of race cars do this as well

jangy

The E63 runs two 70mm TBs, but is there a way to add another one to our motors? I think it may be cheaper to have a custom fabbed 100mm

dyno

... wait, please wait !
not "how many" nor " size",
let's play with DESIGN
for now

Zod

As a member here mentioned metal = more heat?
I heard MKB had over heating issues in the UAE, not sure how true this holds to.
Also with this new Y pipe design work with 80mm TB?
because if it does not, then meh

germankars

actually it is how many,, if you have the money,, its what race cars and dragsters use.

see here

http://www.scienceofspeed.com/produc...rottle_bodies/

video of V8 toyota with 8 Individual throttle bodies.

http://www.youtube.com/watch?v=Ba8sT...eature=related

and here with Porsche and Ferrari example
http://www.twminduction.com/Throttle...eBody3006.html

of course F1 cars use this as well, but with 18000 rpm you need alot of intake
lol

germankars

actually it is how many,, if you have the money,, its what race cars and dragsters use, but some hobby racers use them and get sub 10 sec Qtr's


see here

Acura NSX system
http://www.scienceofspeed.com/produc...rottle_bodies/

video of V8 racnig toyota with 8 Individual throttle bodies.(insane sound)

http://www.youtube.com/watch?v=Ba8sT...eature=related

and here with Porsche and Ferrari example
http://www.twminduction.com/Throttle...eBody3006.html

V8 Hemi TB
http://www.twminduction.com/v8_kits/v8_kits-FR.html

of course F1 cars use this as well, but with 18000 rpm you need alot of intake
lol

dyno

yes, for sure they had heating issues with this 680 hp conversion the made for Abu Dabi

but Y-pipe seems the same

dyno

thanks for links
... also my already old byke has 4 individual bodies (carbs)
but this is easy for NA cars .. in our FI 55k we should need then 8 small individual mini-compressors

personally, I m not interested in going the multi-TB route .. at least till oil will remain at these levels

but, thanks to your arguments I recall, a lot back in time, late sixties when my Father bought the "Super" version of Alfa-Romeo 's Giulia: it was endowed with a special "carburatore Doppio Corpo" or Double-body, as you can see below

maybe this method could have some easier application in FI engines

stevebez

Woahhhh those MKB intercoolers are nice!

Vadim @ FD

MKB uses 80 mm TB as their first stage of upgrade.

baldmike73

i have similar posts to this about metal y-pipe for porsche that claims hp numbers and after a few dynos with stock and then aftermarket y-pipe very little gains noticed.

looks nice though!

blackbenzz

Interesting...

dyno

should 've been included in their first , I'd have accepted immediately their offer

dyno

yes, .. after reasoning a bit more I think now the best of it can be seen in the low-mid range