Phils87blazer

Looking for some input on which will be better for my truck build . Either twin gt35's or twin Gt45's? Gonna build a 5.3 carburetor set up . Plan on getting better internals for the heads and a turbo cam . Will the gt35's be to small to make a healthy 700 hp or will the Gt45's be to big ?

Phils87blazer

As of now I got a set of flotech turbo manifold with 1 7/8 inch primary tube , edelbrock Victor jr manifold .

jordoza

Depends on which gt35. T4 or t3. Twin gt45 would not work well. Slow spool etc.

ddnspider

iTrader: (26)

Seems like unnecessarily large primaries too.

mightyquickz28

iTrader: (8)

I have twin GT35s going on mine (built 5.3) but I'm still welding up the hotside. It'll be another month before I can fire it up and even then, being I'm in upstate NY, I won't be able/willing to drive it on the salted roads.

Cwarta

iTrader: (12)

I’ve got a pair of vs Racing 61/63 billet gt3682 t3 .083 A.R. turbos, should be running soon

adamantium

iTrader: (3)

I think they're too big for a 5.3 i asked tony reiners whos gone in the 150s with them but he thinks they'd take for ever to light. Heres his thread

http://www.yellowbullet.com/forum/sh....php?t=1822418

coltboostin

China 45s turbine is way to big for the 5.3 to be effective. 70's tech compressor and turbine wheels as well, and it weights a billion pounds. There is many, many other turbos you would want to use before those in a twin set up.

adamantium

iTrader: (3)

Right now the cast wheel vs475 is like $450 iirc, idk why anyone would consider going twins? Double the work and materials for a less than desirable outcome.

Forcefed86

iTrader: (4)

Depends what the goal is IMO.

Twins allow the same flow as a larger single with less back pressure. Meaning you can be more aggressive with the top end of the combo with twins. This will make more power per pound of boost in general. Plumbing for the big turbine singles can be more of a pain than 2 smaller turbos. Also resale is usually higher on a twin setup...

If those are your only choices I’d go GT35’s hands down. Might look into VSracings 61/65 T4’s with the .68 housings as well. Don’t think they advertise them… gotta call. I’m wanting to say they were around $250 last I asked.

Cwarta

iTrader: (12)

I have one of each, a twin turbo car and a s480billet car. The twin car, even though space wise is much tighter and more complicated, was easier and the same price or cheaper than the single car.

Cwarta

iTrader: (12)

Just a little update from me. Car made 700+ and ran 10.1@136. Launched on 3# and hit the limiter hard on the 2-3 shift. 3800# car 5k d/a