Schraders

iTrader: (3)

I'm trying to pick a turbo for a 6.0. The car is a 1961 Impala with a T56 transmission, 317 heads and an LS9 cam. It's a street car so I'm looking for instant boost with lots of power under the curve and I don't need to make a crazy top end number. I have built a 5.3/T76 and a 4.8/T72 (in other cars) and I have not been happy with spool time on the street.

I like the TC76 and 78 but I'm wondering if an S300SX3-66 might work even better? Way too small? What do the experts think?

T76s10

iTrader: (6)

S475 t4 83mm turbine 1.10ar

67Firebird455

iTrader: (27)

Agree ^. Smaller turbine wheel, with good sized compressor will work great on your build.

Schraders

iTrader: (3)

The S475 is way, way out of my budget. So if your only choices were an MP T70 with a .96 A/R or a TC78 with a 1.15 A/R which way would you go? $400 for the MP, $600 for the TC78.

Remember, I'm looking for full boost at idle...

T76s10

iTrader: (6)

you must be really picky if you didnt like the way a t76 spooled on a 5.3 lol. all these turbos with the 65mm & 68mm turbines spool instantly on all these engines. i would do the tc78 with the 68mm turbine and the biggest ar you can get. even thats going to be a small turbo. i had twin 6162's on my lq4 with the tu2 cam and their wasnt any lag. felt just like a big block.

Schraders

iTrader: (3)

My 5.3/T76 combo used a TU1 cam with a 3.08 gear. It came on the pipe hard at 3500 in second gear, which was about 50 miles an hour. So I could light the tire (29") from 50 to 85 or so in second and then you're out of room on the street, show's over. I ran the high gear because I was trying to get early spool, maybe I should be running something lower?

T76s10

iTrader: (6)

Was that with a t56? A 3.08 seems kinda tall with a 6 speed. You might want to try 3.55 or a 3.73. I've never messed with 6 speed stuff so I don't know for sure

69-chvl

iTrader: (11)

s475 is one of the cheapest turbo's out there - at least the T6 version. Mine in the t4 was like 850.00

Schraders

iTrader: (3)

Yes, T56. It had 3.73's in it at first and pretty much wouldn't spool in first gear at all, second saw full boost closer to 4000. The 3.08's brought that down to 3500.

The new T4 S475's I saw were in the $1300 range.

ZNix

iTrader: (1)

http://www.forcedinductions.com/productsborgwarner.htm

S400SX-75 ETT*

1050

1.10 83mm
T6 and T4

$649

burbalanche

iTrader: (3)

Correct ^ but an additional 200 for t4 housing

T76s10

iTrader: (6)

how much boost were you running? if you were making a full 15lbs of boost or so at 3500 thats spooling pretty quick imo. i think someone on here made like 600hp to the crank with on3's 76mm turbo on a lq4. if you dont care about power up top then just run something with a 65mm turbine and big ar.

sostreet

iTrader: (2)

Op I have a tc78 with a 1.15 ar available due to wanting to make the switch to a s475 or s480

geoff17

My stock lq4/317 heads and a tooley spec'd cam with a tc76 spools REALLY fast but with a 4l80e even with a tight converter. Its a .96AR I believe and 3.5 inch downpipe and BB turbo. Boost comes in really quick and easy and thats through a full exhaust. Turbo still has enough steam to bring me to a 10.1 @ 139 spinning off the line so it has potential to make pretty good power. I am thinking about selling it however for a PT 88 so feel free to PM me an offer.

Forcefed86

iTrader: (4)

How fast you spool is determined by the combination as a whole. IMO the LS9 cam is very poor at spooling a turbo early. (ran it last year) Also your hotside piping diameter plays a large roll. With a 2" hotside and proper cam I think you could spool up the cheap $650 S475 very quickly.

Blackpanther99

iTrader: (8)

Cant bat the price and quality of a S475

Schraders

iTrader: (3)

In my experience, going from the TU1 to an LS9 cam was night and day in terms of spool time. Yes, there were some other differences between the two combinations but the LS9 cam worked so much better overall.

I pulled the trigger on a used (lightly I hope...) TC78 with a 1.15 A/R. I think I got a great deal, $850 plus shipping for an S475 is just out of my budget for this project right now. The car is a 1961 bubble top Impala, I'll post pictures when there's something cool to look at. Thanks!