Is there any advantage to a divided exhaust housing on the turbo for a B18C engine? Could anything be incorporated into the turbo manifold to take advantage of the divided housing?

Thanks
Ben

 

My knowledge is limited but the divided housing is better because on a 4 cylinder 2 cylinders fire then the other two, the divided housing seperates the pulses and makes their path slightly smaller to make the turbo spool up faster.

 

If that is the case, then seems like you would have to have a turbo manifold designed like a 4-2-1 header to take advantage of the divided housing.

 

That'll make wastegate plumbing a pain in the butt. Anyone else?

 

up.....

 

u mean tangential? it basically places the shaft directly inline w/ the flange, instead of somewhere lower like most our turbos. most turbos have a ppath they follow, the air enters and is guided to the shaft. the tangentials ive seen place the shaft directly infront of the flange..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bnjmn &raquo;</TD></TR><TR><TD CLASS="quote">That'll make wastegate plumbing a pain in the butt. Anyone else?</TD></TR></TABLE>

Yah, i found that out the hard way. The turbo and manifold i have are divided housing. When i first got to the dyno, from 7200rpms to 9200rpms, the boost was spiking from 17psi to 26psi! heres what i did.

Before:


After:


Turbo Dandees manifold, Same design, same problems that were had on Kenny Trans racecar with this manifold

 

Here is a pic of my new baby-



Thanks very much for that pic of the manifold...it'll help a bit.

 

Does that manifold use a divided flange as well? Anyone sell those or will that have to be custom? Do you have any pics of what the inside of the collector on the manifold looks like?
Apparently divided manifolds/housings are all the rage on RX-7s and Supras but haven't trickled down much to Hondas. From what I've found it is a massive waste not to use a divided manifold and flange when you have a divided turbo housing.
The divided housing is supposed to help with spool up since it seperates the engine's exhaust pulses and keeps them from "competing" with each other. Feel free to correct me if I'm wrong.

Thanks
Ben


Modified by Bnjmn at 10:16 PM 7/31/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bnjmn &raquo;</TD></TR><TR><TD CLASS="quote">Does that manifold use a divided flange as well? Anyone sell those or will that have to be custom? Do you have any pics of what the inside of the collector on the manifold looks like?

Thanks
Ben</TD></TR></TABLE>]
Full-race uses a divided collector which is just sweet and works really well. I wont post pics with out geoff's permission.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo &raquo;</TD></TR><TR><TD CLASS="quote">]
Full-race uses a divided collector which is just sweet and works really well. I wont post pics with out geoff's permission.</TD></TR></TABLE>
Actually Art he doesn't make them with divided housings unless the customer insists on it, I was sent a divided housing turbo but we all wanted the undivided, when I talked to Geoff he didn't believe in the divided housings and neither did tony1. I tried to get a few opinions. Garrett stated that knifedging the turbine housing if it is divided will act the same as an undivided.

 

I said collector, not housing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo &raquo;</TD></TR><TR><TD CLASS="quote">I said collector, not housing.</TD></TR></TABLE>
Neither! He made that collector on the site since the customer insisted.

 

Race manifold, not street.

 

there is no advantage on our cars to running a divided housing, there is only a disadvantage.

We have a proprietary collector design that works better than either style, or combination of the two. no pics for a little while.

 

Dont worry geoff, I didnt have any pics anyway.

 

I do

 

I hope this will work good for me.-pdang

 

So, is there any negative effects of using a divided turbo with a non divided manifold? i.e. inline pro mani?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bnjmn &raquo;</TD></TR><TR><TD CLASS="quote">Does that manifold use a divided flange as well? Anyone sell those or will that have to be custom? Do you have any pics of what the inside of the collector on the manifold looks like?
Apparently divided manifolds/housings are all the rage on RX-7s and Supras but haven't trickled down much to Hondas. From what I've found it is a massive waste not to use a divided manifold and flange when you have a divided turbo housing.
The divided housing is supposed to help with spool up since it seperates the engine's exhaust pulses and keeps them from "competing" with each other. Feel free to correct me if I'm wrong.Modified by Bnjmn at 10:16 PM 7/31/2003</TD></TR></TABLE>

YES, my manifold AND turbo is divided. With all honesty, i dont really know the advantages and disadvanteges of it (esp. on a honda), Geoff, care to chime in?

 

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

YES, my manifold AND turbo is divided. With all honesty, i dont really know the advantages and disadvanteges of it (esp. on a honda), Geoff, care to chime in? </TD></TR></TABLE>

 

What is the disadvantage to a divided housing? When is it an advantage?

 

ups....

 

I love divided housings! And yes there is benefits especially on smaller motors.

I'll post pics later tonite of a header we did for a customer.

 

All turbo headers should always take advantage of the exhaust pulses. In a undivided design you should always run them sequential(1-3-4-2).

With a divided housing, and a properly designed header, You will notice excellent throttle response and almost non-existent turbo lag. In addition it allows you to use large turbos on very small engines. F1 cars of the engines were 1.5L making over 1200hp. (ex.. Hart, Bmw, Zakspeed)
With the divided housing you should group cylinders 1&4 into a 2 into 1 collector and cylinders 2&3 in another 2 into 1.
Wastegate needs to be plumbed from each group!!!

I like to consider it free power, take advantage of it and it will be a totally different machine, you get the benefit of using a low restriction/pressure turbine combination while retaining the instant response offered by harnesing the power of exhaust pulses to full effect

Take a look at one of ours.







Modified by Header Tech at 9:38 PM 8/1/2003