Hypergear Turbochargers and High flow Services Development thread

[hypergear]

I only have 50mm gates. that will work. For the turbo and engine size, any thing 38mm and above is fine.

[Birds]

  On 01/09/2012 at 2:44 AM, scotty nm35 said:

I'm talking about a VQ not an RB.

Why would the engine matter? The turbo will pump X amount of air, and if there are no restrictions any engine should run around 300 on e85 with an SS1PU, maxing out the compressor.

Isn't displacement a restriction? I would have thought at a given RPM the turbo can pump more air through a 2.5 than a 2.0.

[Rolls]

  On 02/09/2012 at 7:48 AM, Birds said:

Isn't displacement a restriction? I would have thought at a given RPM the turbo can pump more air through a 2.5 than a 2.0.

Yes it is a restriction, hence why you need more boost to make the same power on a smaller motor, same as smaller cams need more boost etc etc. Though technically he accounted for that by saying "no restrictions" which basically takes the engine out of the equation and assumes a magic black box that has no friction/pumping losses etc lol.

Edited September 2, 2012 by Rolls

[qik32]

Hey Stao, looking good with the manifold what are you going to use to weld it up with??

[Manuel Kasko]

  On 03/09/2012 at 4:40 AM, qik32 said:

Hey Stao, looking good with the manifold what are you going to use to weld it up with??

A welder...

[GTSBoy]

I thought he was just going to leave those clamps on there. Mount the heat shields off them perhaps....

[qik32]

I mean stick,mig or tig?

[Cowboy1600]

  On 03/09/2012 at 9:12 AM, qik32 said:

I mean stick,mig or tig?

I'ma take a stab and say not any of those three.

Brazing is the likely best and easiest way to weld steam pipe to cast.

If not, then maybe Mig. I doubt Tig or arc would get a look in.

Stao?

Edited September 3, 2012 by Cowboy1600

[Dan_J]

  Quote

I mean stick,mig or tig?

you ask as its tricky to weld cast iron ?

Edited September 3, 2012 by Dan_J

[Crans]

Tig would easily do it, many people dont even bother pre heating the cast

[Cowboy1600]

  On 03/09/2012 at 9:49 AM, Crans said:

Tig would easily do it, many people dont even bother pre heating the cast

Just been doing some Googling on welding cast and it seems pretty much every method is possible, which I was unaware of, but tig and mig would appear to be the least popular for something like an exhaust manifold as many heat cycles causes it to become impregnated with carbon which makes it brittle.

I found this site - http://www.weldingtipsandtricks.com/ there's some great info there for anyone who's interested. I love welding although don't get to do much these days.

[qik32]

i have asked my local welding supply shop and they said to do it with the stick and preheat it before you weld

[hypergear]

Updates:

This is what the manifold is like after its been jigged up and reading for welding:

[hypergear]

It is now complete and perhaps how Nissan should've designed them in the first place.

[ARTZ]

Actually doesn't look too bad..

[89CAL]

  On 04/09/2012 at 12:25 AM, ARTZ said:

Actually doesn't look too bad..

+1

How long before you go for some results Stao?

[Cowboy1600]

Did you calculate the extra volume?

If not, it'd be great to do so. Block off the turbo outlet and fill that sucker with water. Then compare it with a stock one.

Can't wait to see results.

[hypergear]

probably in a week or two's time. will post up some photos as its getting installed.

[jet_r31]

that turned out well, can't wait to see how it pans out

cheers

darren

[Cowboy1600]

Also, would running a die-grinder around the ports to open them a fraction and smooth them out be beneficial?

I know port shape and smoothness on intakes are very very delicate, but I don't think the same applies to the to side. In fact smooth ports might speed up gas flow which means faster spool. At least that's my uninformed theory

Might have been worth running the die grinder over the whole inside while the back was off. Maybe give that a go next time.