how important is flow before the turbo.
thanks guys

you guys have some awesome cars

 

You would be surprised at how unimportant it would be. You can easily make 200hp per cylinder with 1 5/8 ID header tubing. I know of one 4 cylinder SVO motor making 800hp with 1 1/2 ID tubing. For midsize V8s wanting to make up to 1000hp, we usually use 1 5/8 ID headers into 2 1/4" crossover pipes and merge those pipes into a collector at the turbine flange. You can decrease spool up time by building a true merge collector at the turbine housing also.

 

Do you have any pics of what a merge collector at the turbine inlet flange would look like?

Thanks!

 

I think Burns Stainless makes a true merge collector that the turbo mounts to, I think I saw their ad in Turbo magazine.

 

I'll try and post a picture of the Y pipe I made for the last turbo system I built which had two 2.5" crossover pipes merging into the collector. Burns stuff is sweet, but WAAAAYYYYYY expensive. Actually, they make merge header collectors with a V band attachment. You still have to make pipes to join the collector into the turbo and that's where I build another merge.