Trumm

I've been sold on the super B single for a while and had planned on upgrading it to twins in a couple years. The past few weeks I feel that I won't be too happy with the small size of that turbo until I upgrade. I am lookin for 500+hp and have recently started thinkin about the 62/71/14. I know that would really work well with some Mach 3's or 4's, but how would that work with a twin upgrade in the future? Would that be good for a primary or would a 64 be better?

I do tow once in a while and I've heard the 64's lag a bit so that's why I was thinkin 62, but using a 62 as a primary seems a little small. Thoughts?

RowJ

With an Automatic, I would stay away from a 14 cm2 housing. Think you are asking for some unpleasant lag.
A manual can correct for lag by winding out the gears a bit but we have no such option.

My BD twins work well at 600 HP (with H2O/Meth).... but that is about the upper limit for them.
Spoolup is, however, spectacular.

Try bigger injectors before you decide. Live with that smoke for a while and you may change your thinking.

RJ

Trumm

So your sayin go with the Super B and maybe some Mach 3's and deal with that until I get the twin upgrade? Doesn't the Super B have the 14 cm exhaust as well?

RowJ

I believe the Super B is smaller than 14 cm@ exhaust housing.

What I suggest is get injectors before getting a turbo. Learn to work with them first before deciding how big you want to go on turbo.

RJ

JVC

I replaced my HY Holset stock turbo and installed the Supper B.
It pulls much stronger now. Boost went fron 27psi to 34 psi.

BigErksG2

62/65/12 or 14. The 71 turbine will be laggy in a twins setup. If you plan to tow I would go with an hx35, hx40, or s360.

Trumm

So if I went with a 62/65/14 or 12, would I use that as my primary and a stock HY as the secondary?

I just wanna make sure I have the power now without screwin myself later when it comes time to upgrade to twins.

joefuss21

just be careful with Mach 3s I had 4s with super b and egts were through roof just savin u a headache if you tow. pm if you want more info.

jp8819

I would think a 62/65 either 12 or 14 housing would be good or look at one of the new 62/68 that are out now have heard good things about them just little more pricey. It would work great for the mach 3's or 4's just a little warm with 4s on the top end if you are staying in it for long periods of time but very managable. Has good street manors and many are running it in twins setups and very happy when it is paired with a big brother usually something in the s400 family. The 62/65 will get you a solid 450 hp with right fueling and can go to 500 but its hot at those levels and overspooled. I will more than likely be going back to a 65 wheel when i go twins to regain some spool time since in a twin application the top turbo will spool slightly slower. The abilty for a manual tranny to spool a larger turbo better is a 2 way street. Yes you have more choices in gears to help get the rpms up to spool the turbo but you also have to regain all that boost between shifts and with the first 2 gears of our trucks being so low you run out of gear before its fully spooled.

DodgenIt

No, take the HY out totally.
IMO, Go with a 62/65/14 or 12 and some Mach 4's
Or a super B and Mach 3's or 4's.
Just be light on the pedal till you learn its limits, then down the road you could go to compounds and keep/use you current 62/65 or Super B as the top one.

Mike Holmen

The best secondary turbo will be either a garrett GT3782R or GT3788R, depending on which sticks you run. The GT3782R over a K-31, would spool super fast and have tons of air for 700rwhp. I've run both turbos in twins, all I can say is that it will impress you. I've drove a few different twins set-up. I'm currently working on a GT3582R over a S366/0.91 with an 44m external gate. Its going to a real nice set-up. The GT3582R is a 62mm inducer, so it can flow some air. It just doesn't have a big exducer (trim) like the bigger brother GT37 series, so its can't push up the pressure ratio, but in twins the secondary, rarely, is pushed up that far. At that point you should put more load onto the primary.

RowJ

Absolutely not! Did not see anyone answer directly and want to make sure you have no confusion.
62/65/12 or 14 is excellent secondary (top) turbo, but too small for primary.
HY-35 is unusable for twins. No point is going into physics of why but it's been tried many times and is just too small.

RJ

Trumm

Any good suggestions on a primary if I do use the 62/65/12 or 14 as the secondary?

BigErksG2

ht3b or an s475 would work well with the 62/65.

Mike Holmen

Here is a good choice of primaries BTH-3B, K-31, S-475 or S-480, GT4202 or GT4508. Try to find something around 100+lbs/min