jfg455

iTrader: (5)

Like the title says, I need to pick turbos and a cam to run in a full forged 408 (iron block, 4340 crank, H beam rods, 8.5:1 Je pistons, ported LS3 heads, single plane intake with an elbow). it is going to be twin turbo, Tubular 1 7/8" primary up and forward headers into the turbos, 3.5" down pipes, 70 C10 pick up 3800-3900lbs, 4L80E, 12 bolt, front mount intercooler, pump gas w/meth, street driven. I was thinking a pair of T76 .84 a/r T4 flange for the turbos. Not sure on the cam side. Thanks in advance.

DrTurbo

iTrader: (3)

TC76's my friend.....you will love them.

jfg455

iTrader: (5)

You don't think 2 TC76's will be too much? I have been reading some posts in here and a bunch of guys are making serious power with 2 TC70's. What housing and a/r would you suggest with the TC76's? Thanks.

Grendel

iTrader: (27)

Getting ready to order the cam from Cammotion... any ideas for this bump stick?

Also, since we last spoke, we're sourcing a 6L90E. Probably a 2Kish stall, unless someone says otherwise.

black98ws6ta

iTrader: (77)

Camshaft would depend on alot of goals you have not specified, Cam motion should be able to take care of you.

A 2000 stall is really small for a build like this, but again it would depend on what your using the truck for and how you want it to perform.

Jordan_NationalSpeed

The most important question; how much power would you be pleased with, and where would you like it to come online? Without that data, sizing is impossible.

Grendel

iTrader: (27)

We're aiming for 1K RWHP, if possible.

Looking for power pretty low off the line as drive ability is important.


Working on specs now:

6.0L Block (ARP studs, ICE head gaskets - might o-ring)
Bore = 4.030
Stroke = 4.000
Rod Length = 6.125
4340 Crank, H beam rods, pistons (Piston Head Volume+29.00cc) with all ARP bolts.

Heads = PRC LS3 Heads with Patriot springs to .660” lift. 70CC Combustion Chambers, stock sized stainless valves (looking for the flow numbers now)

SLP RockerArm Package L76/L92/LS3 Aluminum OffSet 1.85

6L90E trans (TC stall speed is still TBD)

4 linked rear with 12B - 3.73 posi

30.75" tall tire

Twin T76 .84 a/r T4 (as discussed here)?

Thanks for any info you may give,

-J

Jordan_NationalSpeed

For that power goal; double o-ring? Also, what diameter cylinder head stud are you going with, .500"?

My opinion; that's a bit large. Dr. Turbo will probably disagree with me to the end of the Earth about that. Either way, I recommend Precision 6765 billet turbochargers. They are rated to 900hp a piece, and with the D-option turbine housing you can get T4 inlet/v-band outlet .81 a/r turbine housings. Pending on your space constraints, you can get the compressor cover in a few different options;

- E-option
- Inlet: 3.00"
- Outlet: 2.00"
- Centerline inlet to centerline outlet: 2.25"
- Cenlterline inlet to outlet tip: 4.35"
- Anti-surge: Not available

- S-option
- Inlet: 4.00"
- Outlet: 2.50"
- Centerline inlet to centerline outlet: 3.00"
- Cenlterline inlet to outlet tip: 4.35"
- Anti-surge: Available (SP)

- H-option
- Inlet: 4.00"
- Outlet: 3.00"
- Centerline inlet to centerline outlet: 3.10"
- Cenlterline inlet to outlet tip: 5.45"
- Anti-surge: Available (HP)

It all depends where you're placing the turbochargers. But for your power requirements, I'd try hard to fit the H-compressor cover.

Once again, just my opinion.

Grendel

iTrader: (27)

I have ARP 134-3610's now. The block can be re-machined for a bigger bolt size, when it goes out for o-ring treatment. Probably going for the biggest diameter head bolts we can get in there, considering this is not a War-Hawk block (thought it was when I bought it).

CarsandWomen

iTrader: (19)

go with a higher stall, i daily drive my 3300 and its VERY well mannered and is quite noticeable. i think for you like a good 2500-2700 would be good, thats where mine started out and it was nice

1CAMWNDR

iTrader: (21)

A pair of T72s would rock also. Might want to make the primaries 1 3/4" to keep velocity and heat up.

BLk01SS

iTrader: (7)

I've got one brand new TC72 I'll make you a good deal on. PM me if your intrested

LASTLS1

iTrader: (7)

I have a pair of TC 76's for sale. Also Speed Inc has done a bunch of twin 408's I would contact them for a cam. Good luck with the build.

crashly

what rpm range ?
also, lose the .84 dual entry, and pick a single entry

first guess with limited info given,
get the f1-68 turbine,
.81 or .96 a/r
tc72 or tc76
both would do the requirements
those tc series from FI are just about unbeatable for value.

CarsandWomen

iTrader: (19)

if you stick with the divided flange then you can run Spool Valves, and FYI, sunday i was cuttin 1.75 60 foots on a dead hook on street tires in a full weight camaro and trapping 86mph (1/8 mile) so yeah, give it some stall you wont be disappointed.

black98ws6ta

iTrader: (77)

IMO, there is no reason to add another peice that could fail to the puzzle. This combo will spool fine if he picks the correct parts. I think a spool valve should be used when you have to have one.

LASTLS1

iTrader: (7)

Agree, I could foot brake mine to low 1.3's. Those things would spool before I put it in drive! lol I would get a low stall also.

Grendel

iTrader: (27)

RPM range is an interesting question, as I don't know what this motor's reciprocating assembly will handle.

I bought SLP roller rockers for it, it's an all forged lower. Fitment and assembly will be top notch.

What is an effective red line?

I figured I want power low, as I do want to run this over the highway and occasionally on the drag strip.

Grendel

iTrader: (27)

Heads are:


PRC LS3 Intake PRC LS3 Exhaust
cfm cfm
.200 154 115
.300 223 170
.400 282 198
.500 324 211
.600 351 228
.650 358 232

XtremeDime

iTrader: (16)

Why not just a big single??