Topic: when building a twin scroll......?? (Read 6969 times)

toyolla86 · « **on:** August 27, 2009, 02:40:58 PM »

so ive been reading some stuff saying that when you build a twin scroll you need to pair the runners.

how important is this.

say i wanted to build a log manifold, would that be totally stupid on a twin scroll turbo.

you typically want 1-3 and 2-4 together right.

toyolla86 · « **Reply #1 on:** August 27, 2009, 02:48:26 PM »

maybe ill eliminate the twin scroll. and run it like a single scroll.

turbob16hatch · « **Reply #2 on:** August 27, 2009, 05:40:42 PM »

yeah the point of running divided is to increase the pressure on the turbine wheel by separating the exhaust pulses. running a log is not separating pulses.

BRIAN MP5T · « **Reply #3 on:** August 27, 2009, 05:54:14 PM »

The Twin is normally used with a tube style equal length manifold.

If you don't use a Tube mani, it's defeating the point of the housing.

ratcityrex · « **Reply #4 on:** August 27, 2009, 06:02:07 PM »

Quote from: BRIAN MP5T on August 27, 2009, 05:54:14 PM

The Twin is normally used with a tube style equal length manifold.
If you don't use a Tube mani, it's defeating the point of the housing.

But you dont need to have a twin scroll to run a twin scroll. Look at joes (d16y8-z6) holset on his log that hes running mid 10's in on his civic.

turbob16hatch · « **Reply #5 on:** August 27, 2009, 06:03:39 PM »

yeah but what would the gains be if he did it correctly?

ratcityrex · « **Reply #6 on:** August 27, 2009, 06:08:34 PM »

I would imagin faster spool time. But this dude is talking about running his twin on a log, so just slap it on.

klyph · « **Reply #7 on:** August 27, 2009, 06:15:40 PM »

I thought SPLOG stood for split pulse log...

ratcityrex · « **Reply #8 on:** August 27, 2009, 06:18:00 PM »

I thought it stood for split log.

ratcityrex · « **Reply #9 on:** August 27, 2009, 06:53:07 PM »

log

Splog

patsmx5 · « **Reply #10 on:** August 27, 2009, 07:09:17 PM »

I'm running a twin scroll on what's basically a cast log manifold. It works fine. Yeah, it would spool better if I had a 4:2 header for it, but this works good enough. If I had to redo it I would make a weld-ell 4:2 manifold for it.

toyolla86 · « **Reply #11 on:** August 27, 2009, 07:49:34 PM »

but technically that SPLOG isnt even correct if it is supposed to be
1 and 3
2 and 4
right?

eh i dont think it really matters that much. its all pumping exhaust. hahah.

it would really only make a huge difference if when it hits a certain rpm a second scroll opened up like
that old thread was talking about on ohmt. where it had a flapper that would open a whole new port to the twin scroll

ratcityrex · « **Reply #12 on:** August 27, 2009, 08:24:21 PM »

Quote from: c0mpl3x on August 27, 2009, 07:53:45 PM

1342 is honda firing order isn't it?

Yep, at least the ones i work on.

Corey · « **Reply #13 on:** August 28, 2009, 12:49:42 AM »

no.

on a honda you pair 1+4 and 2+3 on divided housing setups.

turbob16hatch · « **Reply #14 on:** August 28, 2009, 01:00:27 AM »

Quote from: Corey on August 28, 2009, 12:49:42 AM

no.

on a honda you pair 1+4 and 2+3 on divided housing setups.

^^^this

toyolla86 · « **Reply #15 on:** August 28, 2009, 02:08:14 AM »

i was thinking this may be the actual way.

and i think most cars would be 1-4 and 2-3
so i am corrected.

but i will have to research for a ka24de

Corey · « **Reply #16 on:** August 28, 2009, 02:18:53 AM »

ka is the same as a honda

toyolla86 · « **Reply #17 on:** August 28, 2009, 12:36:57 PM »

very well. 1and4 it is.

that obviously takes much more tubing. which we dont have. hahah. and they would definitely be unequal runners.

turbob16hatch · « **Reply #18 on:** August 28, 2009, 01:15:57 PM »

equal length is not all that important.

just order up some bends there dirt cheap $5/e

ratcityrex · « **Reply #19 on:** August 28, 2009, 01:27:43 PM »

Quote from: toyolla86 on August 28, 2009, 12:36:57 PM

very well. 1and4 it is.

that obviously takes much more tubing. which we dont have. hahah. and they would definitely be unequal runners.

Like said b4, unequal length is not a huge deal. I would take setting up the runners for a split over equal length any day.

kgx · « **Reply #20 on:** August 28, 2009, 04:09:53 PM »

tell me you're using an EVO turbo and not a CT26! CT26=doorstop.

toyolla86 · « **Reply #21 on:** August 28, 2009, 04:58:23 PM »

tdo5hr

Toysrme · « **Reply #22 on:** August 30, 2009, 05:06:54 PM »

Quote from: turbob16hatch on August 28, 2009, 01:15:57 PM

equal length is not all that important.

just order up some bends there dirt cheap $5/e

truth

toyolla86 · « **Reply #23 on:** August 30, 2009, 08:57:57 PM »

maybe that'll have to be done.

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Author Topic: when building a twin scroll......?? (Read 6969 times)

BRIAN MP5T