Some real manifolds

[gmacrae]

bah! thats not a manifold This is a manifold!

[Bazda]

bah! thats not a manifold This is a manifold!

for a 6 cylinder they should have made that split pulse, would of worked much better, also should of used slip joints to avoid cracking at high temps + didnt even make use of a megaphone setup with reverse cone. Not much maths involved in that.

This is what you call a real turbo manifold

[gmacrae]

for a 6 cylinder they should have made that split pulse, would of worked much better, also should of used slip joints to avoid cracking at high temps + didnt even make use of a megaphone setup with reverse cone. Not much maths involved in that.

haha you reckon? Split pulse is a myth. That manifold was designed by the smartest people/computers in the business, swapping from an hks/style single manifold to the one above has gained many people over 100rwhp increase in power at the same boost level.

Still, it costs $2.5k US so you'd expect it to be pretty good

[sergei]

Has anyone noticed the hole in the block on the pics above?

[bluemaumau]

hah

[Adamal]

Has anyone noticed the hole in the block on the pics above?

Its for cooling purposes, silly

[gmacrae]

Has anyone noticed the hole in the block on the pics above?

Yea, standard feature on all SR engines

[Crucible]

haha you reckon? Split pulse is a myth.

huh? explain yourself please

also should of used slip joints to avoid cracking at high temps + didnt even make use of a megaphone setup with reverse cone. Not much maths involved in that.

So are those slip joints just an interferance joint with no welds to allow movement? whats the theory behind the megaphone and reverse cone Barry?
My boss had a 700hp Escort he raced with Trans-Ams and reckoned a venturi at the collector made a big improvement with scavenging.

[strx7]

haha you reckon? Split pulse is a myth.

You've never seen/felt the difference between a divided and non divided manifold on a 12A or 13B have you?

split pulse is a myth? (tui ad) YEAH RIGHT

[vvega]

haha you reckon? Split pulse is a myth.

You've never seen/felt the difference between a divided and non divided manifold on a 12A or 13B have you?

split pulse is a myth? (tui ad) YEAH RIGHT

even ignorance is no excuse for that kind of a statement

car compays spend more money than any race car teams developing there cars and more specifically there engines....in fact your make teh comparason of "chump change"
so your smartest people in the industry dosent stand up
why
cause they work for teh major car companys

id also be keen to see a 100rwhp gain at the same boost (again a pointless basis for measurement.)
boost is not a datum for measuring inprovement. but hey those "smartest guys in the bussness would have told ya that"

infact id say with teh same turbo setup on a obviouslys such a well tuned car id say you couldnt get a increase liek that on a perfectly sized turbo without some major surging problems


so many flaws with such a little statement and so little time to waste wading though the crap



v

[Bazda]

for a 6 cylinder they should have made that split pulse, would of worked much better, also should of used slip joints to avoid cracking at high temps + didnt even make use of a megaphone setup with reverse cone. Not much maths involved in that.

haha you reckon? Split pulse is a myth. That manifold was designed by the smartest people/computers in the business, swapping from an hks/style single manifold to the one above has gained many people over 100rwhp increase in power at the same boost level.

Still, it costs $2.5k US so you'd expect it to be pretty good

2.5K US is pretty reasonable for that manifold, its nothing special.
I think you need to learn some theory

oh yes this is definatly got a venturi in it
check out the burns stainless website has all the info about collectors etc

[gmacrae]

ok bazda, ill leave you to argue whatever point you're trying to make with Geoff at FullRace. Good luck with that one.

[vvega]

:roll:

ok bazda, ill leave you to argue whatever point you're trying to make with Geoff at FullRace. Good luck with that one.

perhaps you could get him to argue mine

[Adamal]

YEAH! I mean, wait, NO!. I mean.. Hold on, which manifold are you going for vvega??

[gmacrae]

man you guys crack me up, good ol toyspeed to the rescue again

Split pulse/twinscroll on your average 4 or 6cly engine makes 9/10ths of $&#$% all difference in spool time and no difference in power output... when did rotories come into it?

Venturi collectors in turbo manifolds? Show me some data that proves this theory and ill accept it (not from someone who is selling it). N/A, sure good advantages to be had there. At one point, a venturi is a restriction. If you're trying to create a manifold with as much turbo preference as possible, ANY unnecessary restriction between the runners and the turbine isn't a good thing and will negate the positive scavenging effect of a venturi. That manifold needs to run 2 wastegates because it flows so well into the turbine.

Vvega, i cant really make out what you're trying to say (stay in school kids), so imma just *nod* and say; i mentioned that the boost level was the same bacause often if changing a manifold the boost level can vary slightly (im sure you can get your head around this). I mentioned it to show that all things (except the manifold) stayed the same. ie. the increase in horsepower could not be attributed to an increase in boost.

What has cracked me up most about this thread is Bazda's response to my light hearted post of a picture of (imo) one of the most beautifully made manifolds on the market. Like it was some kinda personal attack lol. Bazda, calm down buddy, your manifold is pretty too

"for a 6 cylinder they should have made that split pulse, would of worked *much* better," ...nope, they dont, its been tried (of course)

"also should of used slip joints to avoid cracking at high temps" ...the robotic tig welds in the FullRace manifolds achieve perfect penetration to the point you can hardly even see the weld even on the inside of the runner. They're some hard-ass grade of thickwall stainless. Guaranteed for life, they never crack. At this level, slip joints (IF you could make them with thickwall stainless) would just create unwanted turbulence.

"+ didnt even make use of a megaphone setup with reverse cone. Not much maths involved in that. " ... hehe i think you're trying to say venturi here, read above.

Bed time, nunnite.

Gene

[strx7]

VVEGA - if you think car company's spend millions getting every ounce of available power out of a production car you must be dreaming. Run of the mill road cars are designed for longevity/reliability. Outright power isn't that high on the list. They need something which will do 100K + without any issue. Are you also one of the people who believes that Cast Iron is the best material for turbo manifolds too?

Look at the F1 exhuast manifolds from back in the days when they were running 1.5 V6 engines at 1000+ HP, big long runners before the turbo, giving the best powerband posible, and people will try and tell you that short runners are best.

Turbo exhuast physics aren't all that different from N/A exhuast physics.

[Mr Revhead]

wont the rev range have an effect on the length of the headers?
i cant recall the exact figures, but im sure F1 4cyls and V6s from the turbo era operated at a bit higer than the average road car.

my point being higher revs = longer runners.

[sergei]

I think it is opposite => higher revs shorter runners (reasoning is due to wave length being shorter at higher frequency)...

[Chickenman]

They could be long or short really, as long as they stay "in tune" with each other at collection.

I had typed a huge post about the correlation between audio and automotive engineering but I think I hurt my brain

[strx7]

I think it is opposite => higher revs shorter runners (reasoning is due to wave length being shorter at higher frequency)...

correct, same with inlet manifold runners