willizm

iTrader: (10)

So I figure I'd post up some pics of my recent conversion from a TC78 to a PT7675. I haven't actually installed it yet, but I pulled the TC78 out and got some side by side shots for you guys to compare. I also did a mockup of the turbo in the car and my hot and cold side piping line up. The outlet is a bit longer on the PT unit compared to the TC. The t4 flange in relation to the downpipe outlet is spot on the same. I had to hold off bolting on the PT unit because the only clearence issue I had was how I have the radiator piping ran to the waterpump hits the compressor housing. The compressor housing is noticably larger so if you have a tight area around the compressor keep that in mind. The turbine housing is about the same with subtle differences. Pics below.

Blackpanther99

iTrader: (8)

Nice set of snails you got there! both are .96 AR Housings correct?

willizm

iTrader: (10)

That is correct. .96 AR. The PT7675 is journal bearing with CEA wheel.

Blackpanther99

iTrader: (8)

What build do you have at the moment? If you dont mind me asking

willizm

iTrader: (10)

Single TC78 turbo on a forged ls1, tu1 cam, 317 heads with e85. Swapping in a jakes 4l80e and PT this winter

Blackpanther99

iTrader: (8)

Sounds like a mean machine!

Nitroused383

iTrader: (10)

You will enjoy the upgrade. The pt76 has a 3" outlet compared to the 2.5" of the tc. It also is 3/4" bigger diameter on the compressor housing or 3/8 per side.

95wannabe

iTrader: (20)

Interested in selling the TC?
PM me info if you'd like

RedRocketZ28

iTrader: (19)

Nice! I am considering the upgrade to a 7875 Turbonetics over the winter. One drawback though, I don't have a forged motor.

o2camaross

iTrader: (2)

No need for a forged motor. OP, I think you will really like the larger turbine

BOBS99SS

iTrader: (2)

Willizm,your cars a m6 correct? Finally making the auto swap?

RedRocketZ28

iTrader: (19)

Even if I want more than 650 rwhp? I don't want to start bending these stock 03 rods, lol.

Will, your car is going to be nasty come spring time!

willizm

iTrader: (10)

No it was a FLT 4l60e lvl6. Just don't want to continue going through clutch packs and making it live anymore.

willizm

iTrader: (10)

Thanks man, I like what I've seen in your car. Looks like it's a bad *** car for sure

1sick-Z

iTrader: (3)

Nice comparison. I love that turbo.

Ryans99ls1

iTrader: (16)

Literally did this swap a couple weeks ago. the 7675 dropped right in place of the TC78. Havent had a chance to retune it and really get on it but it seems to spool exactly the same.

let us know what you pick up from the swap.

nick y

iTrader: (1)

I know its been a long time but any updates??????

yenkomike

iTrader: (2)

im glad you posted that pic of the tc-78. it shows me just what i needed to see my tc-78 has a .96 housing but it has been cut and a 3.5 downpipe flange welded on and is tapered perfectly to the turbine. it is such a nice job i thought it was stock. my downpipe flange is 3.5 id and 4.25 od of flange. anyone ever seen one done like mine and how much improvement was it. thanks.

willizm

iTrader: (10)

Cars going on the dyno shortly now that I have the fueling to back it up. We are going to push the pt7675 so hoping for good numbers and track times this year.