Homemade M20 Log mani

[WillG]

Ok after a attempt at a tube mani with pipe way to thick, it got 1/2 done was so heavy and twisty i gave up becuase I couldnt be bothered with effort to get more suitable pipe and start again (doin this in back garden btw) and thought i just order PPF one, but PPF one will take a long time (months) to come, if they make me one atall , and i thought well BMWSOB is making near 400 hp and 11 sec 1/4 with a log so I decide ill knock one up and try it and if im not happy with it and I think its holding me back ill beg PPF to make me one.

http://nafiannadragun.co.uk/will/DSCF0222.JPG

http://nafiannadragun.co.uk/will/DSCF0223.JPG

http://nafiannadragun.co.uk/will/DSCF0224.JPG

Will get both surfaces skimed as its warped abit and caught with grinder a small bit, found place with furnace aswell to stress relive it first so I dont get it skimmed put it on and warps again when it heats up.
Only worry is wastegate is very close but its even closer on TCD mani and i found out the diaphram/spring in tial wastegte take 900F so it should be ok. divided flnage is ported to edge on inside rather then porting turbine housing. Gona see how this works, wont spool so well as proper manifold but I dont really care about that.

[Jos]

ok mega OT here lol, Na Fianna Dragun? As in the Hib/Pryd DAoC guild?! lol.. it is too. I used to play there

Awsome work on the mani too!

[Turbo-Brown]

Hey, that looks pretty tidy!

Can't see you'll have any problems with spooling with that

Head flanges look familiar too! Seems they're turning up all over the world! A guy in Australia's using them now and I've sent loads of people in the states the drawings too!

[WillG]

no idea, asked a friend for some space and its what I got, he sais it is tho.

yeah pleased with mani will be nice to see what its like wont be bothered if it sucks it didnt cost much and ill sell it, but im just waiting to see what its like and get everything else setup and if i dont like it then ill change either turbo to small or manifold to 6-1. its lighter then the stock cast log aswell which is nice, the 6-1 i tried weight a tonne before i even finished it.

[WillG]

Hey, that looks pretty tidy!

Can't see you'll have any problems with spooling with that

Head flanges look familiar too! Seems they're turning up all over the world! A guy in Australia's using them now and I've sent loads of people in the states the drawings too!

yeah cheers for the drawing mate

[Ant]

Very nice work Will !

logs kick arse, they solve more issues than they create IMHO

Good progrees M8

[Toby_Unna]

good effort, that looks cool Will.

mine looks utterly shite and the internals aren't exactly smooth, but it spins up at 2k in higher gears and always makes full boost by 3k, which is fine by me

back garden, lol. i made mine on the gravel driveway

[e30_Turbo]

Looking good Will, atleast you'll have plenty of space left for the downpipe!

Mark.

[mattG]

Looks good, is the disadvantage of logs to do with unequal distance from ports to the turbo?

[e30_Turbo]

Looks good, is the disadvantage of logs to do with unequal distance from ports to the turbo?

It's not too big of an issue to worry about it at our level of modding, anything less than 300bhp or so should be fine on a log.

All these fancy equal length manifolds only really come into their own over a certain amount of flow. And having driven Ants car a few times I certainly couldn't feel a difference to my 7 branch....

Well apart from the space issue.....

Mark.

[dan_emaps]

Looks smart dude! very good work for a back garden job!!

[mattG]

certainly couldn't feel a difference to my 7 branch....

bumb question whats the 7th branch?

[e30_Turbo]

certainly couldn't feel a difference to my 7 branch....

bumb question whats the 7th branch?

External wastegate

[mattG]

still leaning

[e30_Turbo]

A pic to aid your learning curve

[WillG]

Looks good, is the disadvantage of logs to do with unequal distance from ports to the turbo?

its 2 things really, more equal runners are better for same reason people fit 6 branch manifold to NA engines but its also about the pulses, the 6-1 manifolds perserve the pulses better and help spool the turbo abit earlier which is why you have divided entry on holset turbos aswell. Also a 6-1 will flow alot better then if you used an adapter on stock manifold as pipes on stock manifold are quite resiticted, this log will be alot better then using adapter and should flow as much a a 6-1 becuase the way ive used bigger pipes as it gets nearer the collector there is as much or more crosssection area of pipe as you would have in a 6-1

[mattG]

WillG will your turbo have an internal waste gate for your manifold,
cheers for the pick fozzzy

[WillG]

no if you look at manifold there is a vband flange on there right in collector for 44mm tial wastegate, my turbo is a HX40 19cm3 64/74 turbine and 55mm compressor inducer, its probly gona be to big so ill sell it and buy a HX35 but that will be after ive tried it properly with electronic boost control to make sure wastegate stays shut, its a 15 psi spring so ill leave bottom open and feed top of wastgate with boost pressure to keep it shut till about 20 psi only way id change it is if I get lag between 3-4-5 redline gear change

[WillG]

i think turbine is alot like marks but the compressor is abit bigger

[mattG]

is the v-flange the round hole below the turbo mount on pic 3

[miniblob]

I don't know much about them, but that looks pretty damn good for something you made in the garden!!

[e30_Turbo]

i think turbine is alot like marks but the compressor is abit bigger

I measured mine to be :

Cold side: 50mm & 82mm

Hot side: 67mm & 63mm

Exhaust housing is 18cm3

And I know someone else on here has wheels bigger than mine

For reference 18cm3 housing gives full boost on my setup @ 4k but you do see boost from 3k

HTH, Mark.

[Ant]

who is that then Mark ?

[e30_Turbo]

who is that then Mark ?

[WillG]

fozzy mine sound exactly like your accept that the turbine is T4 flange and i must of measured the wheel wrong, i got 64mm on turbine exducer and 74mm on turbine inducer. did i measure in wrong place?

[e30_Turbo]

fozzy mine sound exactly like your accept that the turbine is T4 flange and i must of measured the wheel wrong, i got 64mm on turbine exducer and 74mm on turbine inducer. did i measure in wrong place?

I'm on a T3 flange which saved some hassle too.

I measured the compressor wheel at the inlet, so across the most forward part of the wheel and then the back of the wheel, 50 at the inlet which increases to 82mm at the back.

The hot end is reversed so bigger size is the inner or back of the wheel and the front or last part of the blades for the other.

Then you can work out the trim:

trim (50/80)^2 = 0.39 = 39 trim

HTH, Mark.

[WillG]

41 on compressor and 74 on turbine then, that sound about right?, was you turbine sizes a miss type in previous post? my turbine exducer is same as you but inducer is 84 on mine and 77 on yours?

[e30_Turbo]

41 on compressor and 74 on turbine then, that sound about right?, was you turbine sizes a miss type in previous post? my turbine exducer is same as you but inducer is 84 on mine and 77 on yours?

Using the above, my compressor inducer is 50mm and the exducer is 82mm.

Mark.

[WillG]

on turbine its the other way round tho, you swap then round, im talking about turbine side

[gcorky]

bit ot-soz ,fozzy did you get a 3 inch pipe between block and column ok?your not using any boost control are you....no control valves etc...

got a v-band flange made gratis today....got hold of a gaffa from a machine shop and asked for a price -he turned up 2 hours later and said ,i can have.....guess whos gonna do my wastegate flange for screamer.....????


wonder why you dont get them?with w/g ?


got my downpie bits in 3 inch stainless from the machine your turbo came from-not much of that buggger left now..lol.ill speak to Ant shortly r.e the pipes youve got for system...

[e30_Turbo]

Like this Will

[Ant]

Pah , too small

mines:

HX35W

17cm/3 housing on hot

comp is 57/82
turbine is 77/61

[e30_Turbo]

Pah , too small

mines:

HX35W

17cm/3 housing on hot

comp is 57/82
turbine is 77/61

Thought yours was 57/86?

[Ant]

christ I hope not

will measure again when she's clocked

[mattG]

what sort of measurements would a t3 and a t3/t4 be ?