longhorn450

iTrader: (1)

Ive been reading Maximum Boost and also been wanting to start a twin turbo project. I was also looking at BBSDesigns Twin Turbo Street/Strip 600HP Kit which comes with two Master Power T03, which are equiped with 60 trim compressor wheels and A/R.42 compressor housings for the compressor side, and standard stage-I turbine shaft and A/R.48 tangential turbine housings on the turbine side. According to Corky Bell, small turbos can create extreme backpressure and heat, and should be avoided if possible (from what I understand). My question is, are these turbos considered small or would they be adequate for a daily driver with 1/4 miles in the 12-13 range? (sorry if this is a repetitive question, i didn't net any results with search) Also, is it at all possible to have a small turbo off of one manifold and a medium one off of the other? And how do you intercool twin turbos? two intercoolers or a really special big one??

Thanks for everyones time!

fireturd350

iTrader: (8)

Intercoolers just depend on what you want to buy and can find cheaply. My friend is building a twin 67mm t4 project for his mustang. He got a intercooler that has dual inlets and one outlet (provided with his purchased kit).

I've seen others that have converterd JY or procharger intercoolers for twin turbos. Obviously if you went twin intercoolers it's a little more piping and routing.

Either way you would need to look into your own tubing. I've seen 4th gen procharger twin intercooler kits go for around $400 + shipping on eBay with some piping, so that might be a place to start looking around if you don't want to go JY hopping.

I was told last week it is cheaper and better just to use stainless steel than aluminum piping.

junkcltr

iTrader: (1)

Why is S/S better than aluminum for the IC pipes?

calebzman

iTrader: (3)

Those turbos in the BBS kit would probably be fine. If you are really considering their kit you should just give them a call.

Right, if the turbos are way undersized for the engine that is correct. The bigger turbos you run, the less exhaust restriction, but also the longer it takes to spool. So you need to find turbos that spool quickly yet do not restrict the exhaust in the upper rpm's.

No, why would you want that? Both sides of the engine are going to put out an equal amount of exhaust force to drive a turbo. So you want 2 similar turbos.

fireturd350

iTrader: (8)

That's what I was told in this thread

Steven89Iroc

I never said stainless was better, I just said it was cheaper. If it was better, I never would have spent more money on aluminum, heh. Aluminum dissipates heat faster, and it saves a decent bit of weight when you have miles of IC pipes running everywhere like I will. I told you that you should do stainless with W/A injection because that's the cheaper and easier thing to do, which you sounded like you need.

As for the BBSDesigns kit, that's the one I have, except he was selling Garrett turbos with it at the time, so that's what mine are. IMO the .48a/r stage I turbine sides are a bit on the small side, that's why I asked him if .63a/r stage III turbine sides would work with the kit, which they do. My turbos will work great for a 5500rpm 350, but not much more I think.
89JYturbo used those .48 stage I turbine sides on his stock L98 JY TT kit, albeit with smaller compressors. They ran out of breath pretty fast, but worked well enough to put it deep into the 12's. I'd say that turbine size for a 350 is akin to a stock TPI. It's all good for torque down low, but really lacks on the top end.

OTOH, I would use them if I was trying to save money on a budget stock 305 TT project, they could make decent power and wouldn't be quite as undersized for the smaller displacement. Otherwise, just upgrade to the .63a/r stage III hot sides.

You can use two identical intercoolers then Y the charge pipes to the TB, or you can Y the IC pipes to one bigger IC and send that to the TB, or you can even get fancy and have an IC with two inlets and one bigger outlet. Options are many in that area, go with what's efficient, gets good airflow, and fits.
HTH

fireturd350

iTrader: (8)

Sorry I misunderstood your advice. I apolgize for what I took out of context.

longhorn450

iTrader: (1)

I think the .48 a/r's would be fine since the car is all stock, will be a daily driver, and wont run much above 5k rpms. And thanks for all of the replies.

PETE

iTrader: (1)

Most kits I've seen for a V8 project provide a 62-1 with a .96 housing. Unless I'm mistaken they come standard with the 60-1 wheel with the larger 4in. compressor cover). Obviously the housing is fairly big so you could use a .68 housing for quicker spool up but at the expense of top end flow...

For a mild street setup(light or stock heads and small cam) the turbo i'd purchase considering the cost is relatively the same when purchasing the turbo I'd go with a 61mm turbo with the larger 4in cover and a .68 housing.

My planned setup is a 66mm turbo with a .96 housing and 4in. cover. using a 3500 stall and a 400 trans with 3.08's....

Steven89Iroc

Your advice doesn't make much sense, but he was asking about twin turbos anyway.

TurboedTPI

I would say aluminum ic piping is the way to go. Lighter with more heat transfer.