if you are starting from scratch, and are going to fabricate things yourself, i would too go with one of the s300 framed turbo. Easy/cheaper to rebuild and the extended tip stuff is nice also. Plus there is a big selection of turbine and compressor wheels and housings to get you dialed in.
The reason i went with a 38r, is i already had one and also bb turbos are pretty durable. Also, i machined a 115 housing for it to accept an external wasategate, so i can slow it down or speed it up depending where i want to be as far as boost and drive are concerned. It doesnt go thru near the abuse it did as a single, as the 47 carries the bulk of the load in my setup.
The 47 is just a darn good all around turbo and spools quick for as big as it is. I do beleive if you wanted to keep less drive than boost up to 80+ psi you might select something different, as from my understanding a 47 doesnt breath on the exhaust side quite as well as a lot of 80mm+ turbos.
here are a few pictures. It is a 38r and 47 combo, like Charles. The 47 is the atmosphere, its an 88mm compressor wheel. The 38r is the "high pressure" turbo.
so you have all this to talk about? or to actually do something with? i just couldnt imagine building something like this for no reason but pics. i know you dont compete or anything, but put somebody in the drivers seat who's willing to let it ride.
It will be used to tow whatever I pull. Looking at a 41ft Weekend Warrior right now.
4.10 gears are not exactly race track ready. Also, no traction bars is another problem. Axle warp is horrible with that wheel base. :doh:
The 97 will be a better toy. Regular cab, less weight, and if it breaks, I can leave it in the shop. LOL Thankfully Cali has these old trucks smog exempt! :rockwoot:
the whole point of twins is to be able to spool up faster. There is not much reason to build a set of twin that you have to sit and stage to build up boost unless you are building a straight Comp truck!! and in that case if you are looking to build a comp pulling truck with twins you had better have real deep pockets cause most guys in that class are well over 100k into their truck. Just some food for thought!!
you dont spool as fast as your hp spools, a little slower.
If you go from just running a 38r, as example, to a twin setup keeping the 38r as the highpressure turbo and then a larger one as the atmosphere, it will spool slightly slower than it did with just the 38r.
In a perfect world, i would want a larger turbine wheel than the 38r for my setup, so i would not have to wastegate as much. But being as i already had a 38r, the solution was pretty simple. If i were going to build a setup from scratch, id most likely use a s300 framed turbo as the highpressure. Or if Garrett would have built the 38r with the van turbine, then youd really have something.
i was talking to Pius years ago, and he told me he felt a bb charger can actually withstand a higher sideload from having air forced into than a jb turbo. however due to their inability to be cheaply rebuilt and their expensive nature, they are not worth it.
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