Twin VGT's, not compounds

[Tacoclaw]

If you ran a pulse-matched manifold to each I would think a balance pipe would completely ruin the whole point of it.

The main thing with actual twins versus compounds is that with actual twins you move a lot of air but the pressure ratios aren't that high. At what PSI does a 351 get towards the edge of it's map? Since we have such crappy airflow in our engines the go-to move is just to throw so much pressure behind the valve that the air has to get in there. Compounds are much more capable of getting the pressures up that high.

You may see twins on some full-out racecars and stuff, but they're had their heads, intakes, cams, exhaust, anything involving airflow really worked out so well that they don't need extremely high pressures to get the air in. Even if they could get more power from compounds they'll see diminishing return with the weight and complexity added.

I'm not going to say it won't work, it will and it'll probably look pretty cool to boot, but for a vehicle with stock heads and stuff getting your pressures up is probably a better way to go about it.

[rockbuggy4x4]

I'm not an expert but in my mind, if one were to use a "Y" fitting after the exhaust manifold, wouldn't that keep the balance in the exhaust pressure? And use a smaller exhaust turbine (I forget the correct name for it)? It kinda makes sense in my mind, since you would practically be cutting the exhaust going into the turbo in half.

[1992gen1_fan]

For the balance pipe idea, I was thinking something that would open up to balance them if the pressure were to get a certain amount of difference. Since like the rear cyls run hotter than the front, that might affect the pressure, but I don't know

[Deathrod]

I say "get to work!!!!!" Only way to see if it works is to build it and try. After running the he351ve for over a year and messing around with it I think it would work. The way I run mine (cable operated) syncing them up would be simple. If I didn't have a low pressure turbo on the way for compounds, I might have tried it....would look pretty cool without a hood.

[1992gen1_fan]

Ok, well I guess I'll start watching for another VGT in the rite price range. The dang things have gone up in price since I bought the one for my truck a couple years ago!

It would be a fun project, even if it don't work I guess I will have learned something If it don't work I'll try a hx55 or something in a compound with the vgt. Either way I want more than 1 turbo.

[1992gen1_fan]

What would be a good gauge or wall thickness for the tubing that I would use for the headers? Each turbo would weigh approx 50+ lbs. I do plan on bracing them to the block somewhere too, maybe a bracket from the engine mount.

[Deathrod]

I thought about building my own manifold a while ago and using .120 wall 1.75 tubing....mainly because I have the bender and die for that size. It would be plenty strong and thick enough to keep the heat in.

[1992gen1_fan]

Ok. I have a 1.5" die for the biggest right now, will have to do some shopping.