Alloy

How much could you port the shroud inlet on a T35?

I've seen someone on here has theirs ported to 4", but I think it's a bigger turbo than a T35!

PGT

i wondered this too. mine is about 50mm inside diameter and the pipes to the intercooler are 60mm??

Alloy

Don't know if we will find out though pgt, seem's like you have to be a well established member to get attention around here lol. Hopefully though, one of the tuners or someone can help us.

GTechR

I dunno mate, but keep brining it to the top someone will answer

Alloy

Good idea lol

bump!

the strut brace

wouldnt be any point as far as i can see porting the tunnel unless you were increasing the comp wheel size, i have a t34 thats been machined for a t38 comp wheel etc but thats the only point in doin it as i see it, hth

Alloy

So what's it ported too then? Could you get it to 4", or is that not possible? Or even easy?

Alloy

Is 50mm not 5"? Or am I being stupid lol?

heeman10

50mm is just under 2"! 25.4mm in an inch

Ryan

mines 100mm but mine isnt a t35.

I wouldnt personally mess about with the design characterics of the turbo, there designed to perform with the comp housing how it is, if you port the inlet, if could seriously affect the way the turbo performs.

the strut brace

same question, what would be the point? what do you think it will do? as far as i can see, simply machining the thing to whatever size in fact will do absolutely nothing at all as you cant go and machine out around the blades on the wheel without increasing the size so as far as i can see its pointless

Ryan

it will, i think strut brace.

all to do with pressure and flow.

I.e forcing 40CuF a minute through a huge hose and forcing 40CuF through a hose half the diametre, the velocity of the air is masssively increased, and we know what that does to turbos

BOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOS T

All in my opinion

Alloy

I'm not going to do it mate, I just seen someone on here had a "4" ported inlet shroud with 3" outlet". So it had me curious, that's all, thank's for the help though guy's.

the strut brace

unless i'm talkin about a different part of the turbo, i am talkin about the tunnel part that the air filter hose fits to, porting that bit, the cfm etc are dictated by the comp wheels and size of housing that the wheels sit in , the little tunnel at the front dont do out to affect the cfm as its a big enough hole for mega power as it is, i remain open for correction by the clever bods

Alloy

YAY

Look's like I've started my first interesting topic lol

I'm not sure you're talking about the same part strut brace, but I'm certainly no expert myself and don't know exactly what bit would be classed as the inlet shroud.

the strut brace

is it this bit??

Alloy

dunno, it's hard to tell LMAO!!!! Think you put the wrong pic up dude.

Alloy

Shit, you changed it already!

Anyway, that's what I original thought, the bit with the arrows pointing to it. But I'm now thinking it's a bit further in than that mate.

Ryan

yeah im talking about the same part. do you think air just flows into there?

No

Its sucked, the comp wheel causes a vacuum effect.


so back to my theory, if you suck the same amount of air through a smaller hole, the air will be travelling faster

Alloy

So am I right in saying yours is around 4 inches ( roughly 100mm )? I'm no good at maths

What turbo are you running BTW mate??

the strut brace

i'm not convinced

Alloy

Never mind, just seen it's a T61 Fucking hell mate lol...

Ryan

Strut its just a theory i had nothing more

Alloy

It does make sense strut brace, put it this way. You get a straw and suck as hard as you can, then get a garden hose and do the same thing, you're easily going to be able to suck more air through the hose!

Alloy

Get a gauze on that before you suck up small children and animals lol, jez mate! What is the car going to be used for?

the strut brace

hmmmmmmmmmm, but the whole on the front is massive, like i say i'll remain open

Alloy

That's cool, I can understand where you are coming from with you theory.

GTechR

If you use that theory, then at the same pressure your gonna get more volume, so yeah it would appear to make sence...

But would sucking in more volume than the compressor wheel could deal with have an adverse effect? i.e increased lag? or am I just being thick and getting it wrapped round mi ass?

Ryan

Strut just to through something else in the pot!

Headwork is only a few mm's in variant and that varys bhp levels from 380-1000

Just a theory

With forced induction small alterations are magnified massively

the strut brace

yeah , but the head is an enclosed space inside so porting etc allows the air/fuel to flow faster through a restricted pressurised space, the front of a turbo aint restricted in any way,it just goes straight into fresh air, it already has an enormous hole in the front and the hole is big enough to flow more bhp than the comp wheels/ housing can deal with anyway, its a bit like saying if you fit a bigger air filter hose you will get more flow, there is a point that comes where the comp wheel can only draw so much cfm regardless how big the hole is and i think that the std hole on the turbo is bigger than that as standard so increasing its size is negligible, by yor way of thinking if you took the airfilter hose off altoghter you would get more air flowing ? i cant see this being the case as the turbo's arnt restricted on the intake

if you made sense of my babble there

Ryan

you do though, air filters are restictive, its proven, aswell as being kind of obvious.

you put anything in the way of air it will slow it down

other than of course the venturri effect

the strut brace

yeah i know the air filter will be because thats a restriction on the ability to draw air into the turbo, the big whole at the front aint!, look at it this and tell me these wouldnt flow exactly the same amount of air as its the filter that is restricting the flow

e.g1. turbo with a std hose on it and an induction kit on

e.g.2 turbo with a bigger diameter hose on but with same induction kit on

the pair would flow exactly the same as its the air filter thats restricitin flow NOT the pipe, to increase flow you would have to have a less restrictive air filter.

the same theory applies to the width of the housing tunnel as the restriction is not the size of the tunnel but whats bolted on the end ( air filter )

you see what i mean ?

intersting topic either way

Ryan

ok going on that theory, why arent turbo shrouds ported out to the size off the compressor wheel?

Because Lag will be massively increase.

You say that turbo engineers design turbo's with the shroud smaller because they dont know any better?

Its obviously that way for a reason, and i think its there for this reason.

The tapered housing acts as a funnel\restriction, this forces the the air into a smaller area thus increases the velocity of the air, and creating a quicker spool up time.

Charlie Chalk

iTrader: (1)

Ryan, you get my pm




sorry, back to topic

the strut brace

hmmm, i can seewhat ya saying mate, sounds plausable whaen you say it that way, i stand corrected by the looks of it

Alloy

I'm with Ryan on this until he's proven wrong!

Anonymous

My mates new turbo, now destined to go on a 1.9 engine.

GT42R




I LOVE the look of big turbos

Ryan

measured mine last night and mines slightly bigger than a GT40, but doesnt flow as much as one

That is one Stonking turbo.


Another pic of my T61R, looks a little small now compared to that GT42

Alloy

I think he better give that turbo back to the drag car he stole it off...

These thing's must be so laggy, would fancy sitting in a car with a GT42r running an anti - lag set up none the less, nappies would be adviced!

Ryan

chip whats your take on the theorys that have been floating about on the thread ?