CUSTOM EXHAUST MANIFOLD

davidbek95 · Post by **davidbek95** » Wed May 19, 2004 1:44 pm

IS IT WORTH PUTTING ON A CUSTOM EXHAUST MANIFOLD OR LEAVING IT WITH THE STANDARD MANIFOLD WITH A ADAPTOR PLATE FOR A DIFFERENT TURBO.
REGARDS DAVID

Black JA · Post by **Black JA** » Wed May 19, 2004 1:51 pm

no need to yell.... :P

strion · Post by **strion** » Wed May 19, 2004 2:07 pm

custom

SIRIUS · Post by **SIRIUS** » Wed May 19, 2004 3:42 pm

might seem like a stupid Q. but how much extra kw does a custom manifold give over standard

toysrus · Post by **toysrus** » Wed May 19, 2004 6:22 pm

Equal length manifold, 20HP atw extra over cast.

Slightly better torque aswell and turbo spool up.

ProZac · Post by **ProZac** » Wed May 19, 2004 9:36 pm

20hp atw!? exactly!? everytime!? WOW, THATS AMAZING.

toysrus · Post by **toysrus** » Wed May 19, 2004 11:18 pm

Actual test run......but dont expect the same results 'cause every car is different.

It has to do with pressure being equalised through all 4 cylinders, ie shortest runner causing excessive friction/pressure on momentum of psitons/crank etc.

NXTIME · Post by **NXTIME** » Thu May 20, 2004 5:10 pm

It depends on the design. Just because it is custom made doesn't automatically mean that it will make additional power/torque or decrease lag. I am still using the standard exhaust manifold, ported and with an adaptor flange welded onto it. The fairly large turbo I have bolted to it (54mm rear wheel, 60mm front) still spools up around the 2,500 mark and makes full boost by 4,000, with the tuning and cam needing attention.

David, I would reccomend that you fit the bigger cooler before you go to the expense of fitting a custom exhaust manifold. if and when you do decide to get an exhaust manifold made up, make sure that you go to someone who has made one for a Starion/Mitsu before and can ensure that you will reap some significant power gains from it.

Charlie.

toysrus · Post by **toysrus** » Thu May 20, 2004 5:32 pm

Doesn't have to be custom made, just equal length and really well made.

scum · Post by **scum** » Thu May 20, 2004 6:04 pm

like mine? there equal length. but i dont know what im doing

toysrus · Post by **toysrus** » Thu May 20, 2004 6:07 pm

I've seen yours and if you took the same welding course as scum, then I'ld suggest that you make it up yourself and take it to a local welder to weld it up, would be worth the extra bob imho :D

NXTIME · Post by **NXTIME** » Thu May 20, 2004 8:51 pm

toysrus wrote:Doesn't have to be custom made, just equal length and really well made.

So where do we get these off-the-shelf, equal-length, really well made, and non-custom bolt-on Starion exhaust manifolds that will give a 20HP@wheels gain? :D

ProZac · Post by **ProZac** » Fri May 21, 2004 1:03 am

I'll take six.

SIRIUS · Post by **SIRIUS** » Fri May 21, 2004 3:43 am

hahaha easy way to make 120hp prozac...

its just that i gota quote...750 for a custom tuned length manifold from a exhaust shop...not a bad price me thinks...an i suppose if it makes more hp its worth it no

toysrus · Post by **toysrus** » Fri May 21, 2004 10:39 am

The design isn't hard, get the mandrel bent pipes yourself, line it all up, make a good collector and get someone to weld it all up, about $400 tops me thinks......

Heres a pic,

Austarion

CUSTOM EXHAUST MANIFOLD

CUSTOM EXHAUST MANIFOLD

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