jcuadra

iTrader: (4)

I currently have a brand new tc78 i was planning on using on my lq4 but recently have been thinking of selling it and buying a billet pt 7675.

What i want to know is there any significant size difference between the two?
My clearance is pretty close with the tc78 and im hoping the 7675 is close in size.

Does anyone have any side by side pics of the two?

I'd also like to know if the extra $$ i'd be paying for the 7675 worth it.

jt76

iTrader: (10)

the precision is the superior unit. I don't have side by side pictures but my kit was "designed" around a TC76 and i was able to fit in the Precision.. they are very close in size.

postal14

iTrader: (8)

Thats not a fair fight. Turbonetics designed the TC series to go into tight places. If you have the room they would tell you to buy one of their other turbos. If you have room and do decide to go with a different turbo maybe you could find a better match for your combo / budget with other offerings from t-netics, borg, or pte even. Not trying to talk you out of pte, just that a TC series compared to about anything else isnt a fair fight in a small MM to MM range.

MUSTANGBRKR02

iTrader: (91)

They are about identical. PT being about 1/4 wider is all and the outlet being 3" vs 2.5" on the compressor.

1sick-Z

iTrader: (3)

The t netics is a good unit. Same problem as all other small fram turbos though. The compressor is plenty big. Its that damn exhaust wheel. They use a little 68mm f1 exhaust wheel which will CHOKE a 6.0 up top. All the exhaust has to get out a 68mm opening.

What makes the precision 7675 better is the 75mm exhaust turbine. Doesnt sound that much bigger but it will let alot more exhaust out on the big end than the 68mm.

Most 76-78mm turbos have enough steam for 800hp but cannot support it on bigger cubes because you cannot get the exhaust out.

1sick-Z

iTrader: (3)

Which is why pound for pound you will make not only more power but power in better places.

Again nothing wrong with the t netics unit but you need a biggee ex. Wheel IMO for a 6.0 to have it be ideal. Tc78 will work just fine but.if you want to be raping everyone elses 76 mm turbo get the 7675. Most people just look at one dimension of the turbo. (The compressor) there is a whole other half of the equation you have to take into account. That exhaust has to get out.

1sick-Z

iTrader: (3)

Billet CEA wheel is a gimmick also dont waste the $$. Cast wheels perform just as well. The billet wheel **** is old technology beleive it or not all turbos were.billet wheels before casting techniques improved. Turbo companies are bringing it back as a way to market and sell more turbos and make more $$. Unless you are made of $$$$ i wouldnt pony up for the billet wheel. You will never notice the difference IMO. BB is a different story they will spool faster but only billet wheel in real world i see spoolimg faster are Bullseye Batmowheels. Could be in part to being BB as well but i dont see any reason they couldnt just cast a Batmowheel and have it do the same thing.

LT1 ANDY

iTrader: (4)

Seen a swap first hand! There is no comparisons, 9mph in the 1/4 with no other changes. I'd rather have a billet wheel than ball bearings!

Andy

alexcoreas

iTrader: (1)

I love this video

willizm

iTrader: (10)

This is pretty much the situation I'm in with my TC78. The 68mm turbine wheel is choking up top to the point where making more than 700whp with a forged 346 is probably going to be impossible. The next logical upgrade for me to keep spool where I want it is to go with the PT7675, but even then I'm still trying to get used to the power I'm making now. Also what is interesting is while on the dyno pushing 17.5psi I lost only 10whp closing my cutout and having the exhaust go through a magnaflow catback. Thats a 3" exhaust, but the bottleneck is truly the turbine wheel. At least this is my findings thus far.

jcuadra

iTrader: (4)

At what rpm will the tc78 start to choke up on a 6L?

And how much power would I be able to make make with this turbo on a 6L??

LT1 ANDY

iTrader: (4)

Idle, 500 dollars more for 200 more HP.

HydroStream6

iTrader: (16)

https://ls1tech.com/forums/forced-in...g-tonight.html

Search my name, I have a couple of threads about these two turbos.

1sick-Z

iTrader: (3)

Nice!!!

NemeSS

iTrader: (127)

A tc78 def makes for real good street performer. Quick spooling, but prolly will choke up top.
with the cash u save from buying the tc78 over the pte. Use it get a meth injection kit.
That will free up a few hp.

Nitroused383

iTrader: (10)

There are a few threads floating around comparing the 2. I've ran both the TC76 and PT76. The PT is 5/8" bigger in diameter but if you have around .300" around you TC unit you will be able to fit the PT. https://ls1tech.com/forums/forced-in...-radiator.html

1sick-Z

iTrader: (3)

Here is a comparison of the Exhaust wheels. The other turbo is some bullshit little Garrett but none the less it retains a 68mm .96 T4 exhaust housing.

patriotformula

iTrader: (28)

I made the switch this year to the PT7675 from the TC78 and it is a night and day difference... Worth every bit of the extra 500... Lets just say, you can't begin to touch the amount of hp for the $500 difference they are in cost with that same $500

Vetal

iTrader: (3)

If compressor is fine in TC78, with all the compact housing, is it possible to buy just the turbine wheel (75-83mm) and the housing?