ronnieforrester

iTrader: (3)

So I just bought a TC78 from Huron about 2 weeks ago and then I saw the thread about the bigger wheels available soon.


Sooooooo, with that being said I'm building a budget JY turbo set up for my fox body- The goal will be 140mph trap speeds and maybe a high 9 slip but its mainly a fun street car/Sat night car that gets beat on.


I know the 76/75 from Turbonetics or PT will make a ton more power with the bigger wheel but with the smaller displacement of the 4.8/5.3 will I do ok with the 68mm turbine wheel.

the car will never see any other engines other (large CI) than the JY specials.


My personal goal is to make 665whp - that's what my nitrous 408 Windsor made that I pulled out and sold to do the LSx swap.

basic setup will be

4.8
TH400 with tight converter
TC78- boost undetermined
E85
0411 PCM with HP Tuners

The fox weighed 2800 with my 408/5 speed combo

a-low

iTrader: (26)

From what ive been told and read here the concesus
is that theyre perfect for 4.8, 5.3s I think skinnies
has first hand experience with 5.3 tc78

o2camaross

iTrader: (2)

Skinnies is running a pt7675 I believe. I think you can reach your goal with the TC78, but you can reach it easier with something like a 7675 or T4 S475

Mightymike2000ss

iTrader: (4)

backpressure shouldn't be a issue with the smaller displacement motors. my buddy is running 14psi on his 76mm ON3 turbo stock LQ4 and just ran down a 681rwhp cobra lastnight. He had to turn his boost controller up a decent amount because he is having BP issues with the small turbo and bigger cubes. Car only makes 10.5psi on a 13psi spring.

a-low

iTrader: (26)

Yup he is now, i think he ran a tc before that

Twin turbo c5

You'll do just fine with that setup. I had a 76mm with a 96ar exhaust housing on a 4.8 and it ran great and made plenty of power. It spooled a little slower than on my 383 it was on but still did fine. Just boost the hell outta of it !!!! To make up for the lack of cubic inches.

HydroStream6

iTrader: (16)

I went 136mph on a TC76 with the 68mm wheel on a 370 at over 4000lbs. In a Fox and on a 4.8 you can definitely go 140.

ronnieforrester

iTrader: (3)

Thanks for the input so far guys...


Forgot to mention ill be using a GTP Turbo cam (similar specs to TU1) and 918 springs

Superman09

iTrader: (65)

TC76 or 78 should work awesome with a 4.8 or 5.3l, terrific turbos!

skinnies

iTrader: (33)

tc should be fine for your goals

6.0mustang

iTrader: (2)

the end of the tc78 seems to be 800hp... or atleast for me it is. got 25 degrees of timing on 20psi... e85 9.0:1 compression. 6.0L

rotary1307cc

iTrader: (5)

Why not go with something like the precision gts? Spool is going to be almost the same and the engine happier

I have had both

ronnieforrester

iTrader: (3)

I already have the TC78 and its also about $700 cheaper than the pte.


I was going considering selling the TC78 and going with the new turbonetics with the 75mm turbine.

831jd

iTrader: (3)

How much power did you make with your pt7675 at 17-18psi

831jd

iTrader: (3)

How much power did you make with your pt7675 at 17-18psi

ronnieforrester

iTrader: (3)

achieved my 140mph trap goal !

a-low

iTrader: (26)

Congrats! Now lets work on that 60'.

Superman09

iTrader: (65)

Terrific!

NemeSS

iTrader: (127)

Good stuff.
Think it can go 20+ psi on the e85?
What do u think its putting down thru theth400?

ronnieforrester

iTrader: (3)

Just saw this- it only made 570ish blowing thru the converter- I had it tightened up and haven't re dynoed-


ricer calculators says 620-640whp to go 143mph


just got a 3 bar map sensor- debating on getting a retune with HP Tuners at 21 psi or Switching to MegaSquirt and a Borg S478 Turbo and make more power with less boost.