So I got my old turbo back from rebuilder and I don't want to put it back on. My plans are to not run this turbo at all if i can help it and buy a turbo that will work good as a single, but also work well as a top turbo for a twins setup I am planing on building hopefully this winter if i can afford it. probably not till next year. I was thinking a 62 70 14? Maybe in S300 format? Maybe some of the turbo experts can help me out here.

 

Good choice Curtis. 62 or a 64,,(would be my choice) in a s300 would work good on your truck

 

I have 62/70/13 S300 style from Industrial injection on my truck and it works great. Daily driver and tow rig with no issues.

 

What kind of power are you looking for?

What do you use your truck for?

 

I'm no turbo expert but if you are looking for an off the shelf turbo family that will grow into twins fairly easily both ATS (http://atsdiesel.com/ats2/product/2022218) and BD Diesel (http://www.dieselperformance.com/ind...oduct/index/6P) have a good product lineup.

According to your signature your current turbo is the BD Special which is a 64mm turbo. That turbo is used as the upper/secondary in the BD R850 Twins which is a fairly radical twin setup.

I have been leaning towards the common rail BD R700 twins but there was a public CR install comparison done btween the BD R700's & the ATS Aurora 3000/5000 Twins.
The ATS twins came out well ahead in ease of install, quality & warranty.

I still have lots to learn before I lay any cash down, plus all the supporting mods required prior to twins..

...Joe

 

I'm lookin to get past the 500hp mark, when i get twins on. Not sure but i think that might be my limit as i drive this daily and it tows in summer a bit, Plus I plan on drag raceing it some more, would like to get into the 15's but i could live with being in the 16's. I don't really think i'm going to buy a twin turbo system, I plan on building one myself. Thats why I need to find a turbo that will be sized good for a twins system but work okay as a single for while. Any one know much about htt stainless houseings? hey ccmckee how does that spool? and cool when you tow?

 

GT35R, with an external gate over an S366.

 

I have a GT3582R/S366 almost done, with an 38mm external gate. Its next on the list. It should be one sweet set-up, instant boost, decent top end power for the 500+rwhp trucks. The GT35 sounds small, but it does have a 61mm inducer compressor. The trick is determining the right size of turbine housing. I want my GT35 turbo to run up on the compressor map (max pressure ratio is 3:1), when the truck is at idle. So when you mash the pedal, you have instant boost. When the boost starts to build, that when the external gate comes into play, to equalize the drive pressure and lites the S366. You can still use your 4in exhaust, and tons of room so you can rig up a cold air box or cold air hood cowling .

http://www.turbobygarrett.com/turbob...R_714568_1.htm

 

is that gt3582r the baby turbo you showed me mike ?

 

Sounds like a sweet set up!! put up a vid for us when you get it done

 

Yup Wink, the next one I will adjust more things than what I did on this one. If you look at the map of the 3582R vs the 3788R, they are almost the same but the 3582R chokes up faster at higher flow/high pressure ratio (58lbs/min). I think that its to do with the A/R of the compressor housing. The GT3788R has more compressor exducer (more Pratio) and a bigger compressor A/R, than the GT358R.

I want to put instruments on the twins and show you guys the difference between twins showing how they spool and how efficent that they are. There is no sense putting on a turbo that just doesn't lite, or spools slowly. But saying that there is no value in over spinning a turbo, its a balancing act. Thats where the external gate comes in and lites that S366 harder with more exhaust flow (rated at 80 lbs/min), bypassing the secondary. Every truck is a little different, as everyone runs a different combo.

I picked the S366, as its decently priced for a primary with few different housing combo available.

 

That sounds like a good setup mike. The external wastegate, you put it between the exhaust manifold and first turbo? I ask beucase i see most some systems that work that way, but wouldn't that kill drive pressure for the bottom turbo?

 

Thats the reason for the external gate, is to get that drive pressure down. The gate will go into the exhaust manifold and then go inbetween to the hot down pipe and into the S366.

Opening the gate will drop the drive pressure, but thats what saves the head gasket. To much is bad, to little is bad as well.

I'll let you guys know how these set-up works out.

 

Ahh so it dumps into the hotpipe so you your not loseing the drive to the s366 just bypassing the small turbo, That makes sense to me now. On my system I want to build I want a 62 something on top, should i be looking for a big exhust turbine?

 

I would go with a 58-60mm inducer. Its smaller, a little smaller turbo housing would work better, on 80hp sticks. What primary you want to run? Are you planning any upgrades down the road? I would look at larger intergate or external gate, so you can bypass the secondary.

I just put together a twin set-up on my truck this weekend. A GT3788R over s475. I just run DPP stage 3 injectors (110 rwhp size), very small, like F1 1.6 mach size. I can spool-up decently, but I really need more fuel. You can tell that these turbos want 700+rwhp of fuel, but saying that I have a pretty big intercooler leak, so they have been rung out some more. I think personally, they would work well for my application, my pyro didnt go above 1200 deg's and my max boost was 35-37psi. My air line to my secondary blew off at 20psi, aka big boost leak. I didn't have a 4in air clamp on the turbo(I only had 3in stuff on hand).

Even with a boost leak, with the truck on kill for edge comp/smarty, smoke wasn't that bad. I haven't even touched the wastegate yet.