Re: new itb turbo setup build pics
 

Very clean man.
I like it.

Re: new itb turbo setup build pics
 

looks good!!!!!!

Re: new itb turbo setup build pics
 

you european guys are ------- insane >:D ...........great job

Re: new itb turbo setup build pics
 

looks really good. do you have any more pics of just the intake finished? that plenum is pretty big!

Re: new itb turbo setup build pics
 

crazy idea just came to mind..........

cant you make a mani like a 4-1 header so all the trumpets converge into one pipe off of the intercooler???
that should def be even airflow

Re: new itb turbo setup build pics
 

Jeff,
IIRC this question came up in the Endyne forums talkin about manifold design. Larry's answer was that older intake designs raised the stacks away from the plenum wall to keep turbulent boundary layer flow out of the ports. He also said that proper radiusing of the plenum to runner smoothes the transition enough to prevent turblent flow in the runners. He also posted a formula for determining the correct radius diameter for the best flow but, alas, I have forgotten it.

FYI The belly scoop on the P-51 Mustang was raised away from the fuselage for the same reason.

Re: new itb turbo setup build pics
 

The finished mani looks good.
I agree with t0n. Let's get a Dutch HMT meeting. ;D
Keep it up.

Re: new itb turbo setup build pics
 

you european guys are doing some pretty ------- sexy work.

Re: new itb turbo setup build pics
 

This is the number one misunderstood concept when people think about forced induction. It leads to ideas like "Under boost a heavier flywheel makes more power" and other ---- like that. So here is how it works...

Air flows because of pressure differences, always from high to low. The larger the pressure difference the greater the volume you flow for the same setup. Also the higher the pressure the more dense the air (PV=nRT for the nerds).

As your piston moves down the stroke it creates a lower pressure because the volume is increasing (Think of your lungs filling with air, ribs and diaphragm expand, increase volume, air from high outside pressure (14.7 psia) to low (lung pressure)). On the manifold side, in NA (WOT) the pressure is equal to the atmospheric pressure (~14.7psia (14.7psi above full vacuum)). Under boost its 14.7psia+boost pressure (so 10psi boost = 24.7psia)

Air flows from the intake manifold in NA and boost not because its being forced or sucked but because it is flowing from the high pressure manifold side to the low pressure cylinder side. All the same rules of flow are the same for FI and NA. The only difference is under FI the density of the air is higher (PV=nRT again) and the pressure difference is higher.
NA==> 14.7psia Manifold--> 0psi* Cylinder (*The cylinder pressure starts at 0 and equalizes as it fills to its equal to manifold)
FI++> 14.7+Boost Manifold --> 0psi* Cylinder

Oh and the Europie is right about the trumpets in the manifold. It allows air that is even behind the stack to be drawn around and flow into the stack. Slight increase in flow.

Re: new itb turbo setup build pics
 

the rb26dett we just dropped in a 240 is like that, its f'ing crazy... it uses banks of 2 throttle plates connected to one metal throttle linkage, and all three connected to a throttle rail. prob. the most meticulously engineered production engine i've ever seen. :P