95silvia14

iTrader: (2)

looking for a pair of turbos for my 6.0 408ci stroker using trickflows gen-x 255 LS3 heads. Looking to spin 6500 to 7000 RPM would the 7668 or the 7868 be a better option.

transam69230

iTrader: (49)

Those turbos will max out at 20lbs and about 950rwhp. I had twin 76/68s and ran into back-pressure issues, and torched a cylinder head at 26lbs. The turbos will work but you will want to stay right around 22lbs and no more. They do light off pretty fast from a roll I will say that.

The 68mm turbine wheel is too small, and those turbos shouldn't even be an option from my experience.

You will have better luck with a 75/76 or 76/75 precision or turbonetics with that many cubes. You could also go Borg SXE 300 or S366s as well.

95silvia14

iTrader: (2)

so something like these would be a better choice looking for about 1200.
http://www.agpturbo.com/borg-warner-...-66-73-177275/

stevieturbo

Do TN number theirs differently or something ?

Presumably that 76mm cannot refer to the inducer on the compressor if you're saying a pair of them wont even do 1k ?

transam69230

iTrader: (49)

They'll make 1k to the tire, I did it on 25lbs or so but I also torched a head.

Yes that is the inducer side of the turbo 76mm.

I wouldn't push them much over 22lbs without having a way to monitor back pressure.

stevieturbo

They sound terrible

My 364FMW BW's easily make more than that, and zero issue with the 68mm turbine on them.
Under almost all circumstances except very high load ( ie over 25psi boost ) EGBP vs Manifold pressure is 1:1 on a 382

@95 Silvia, what sort of power are you wanting ?

If around 1k, a pair of the 362SXE's would easily get you there and spool fast

95silvia14

iTrader: (2)

I would like to make about 1250 at the wheels.

stevieturbo

Just stick a pair of 366SXE's onto it then. That will easily see those goals

sbcgenII

iTrader: (1)

Seems like people used to get 650 rwhp out of one of those years back and trap 135~ with a 346. Maybe they make a couple hundred less a piece now.

sbcgenII

iTrader: (1)

https://ls1tech.com/forums/forced-in...make-tc76.html

rotary1307cc

iTrader: (5)

The point is why the hell would you put those turds on when there are other far more suitable at less money?

95silvia14

iTrader: (2)

Im open to all options its just turbonetics is usually what we put on 2j and rbs here at the shop. By all mean im not dead set on them if I can do it with a pair of s366sxe or even using a efr packaging is limited but i guess i do have more room than most gm chassis's that i could fit a single, but would like something to spool kind of quick and be responsive.

would this be the 366sxe
http://www.jegs.com/i/BorgWarner/156...97049/10002/-1
and this for the hot side
http://www.jegs.com/i/BorgWarner/156...ductId=3440656

stevieturbo

Yes, but unless your pipework is all divided to make use of a divided housing, I'd just use the open housing.

http://www.jegs.com/i/BorgWarner/156/177211/10002/-1

The normally have that silly big flange, but some companies will weld a normal V-band flange onto them if you need something a bit neater and more compact.

If you want to remain with Turbonetics, I'm sure they can build you some nice modern 66mm billet wheel units too. But those 76mm ones....are just ancient and those huge wheels will be laggier than a modern smaller design

NemeSS

iTrader: (127)

I'm listening. What's cheaper and can package just as well as tc7x?
No place for bw s47x or s36x
Ive had very good exp. W tc78s n use em on alot of customers street cars n trucks. On3 wont give me a 1yr warranty like tnetics. Some I'm curious on what turbo would b a suitable equivalent?
I'm using twin tc78s on my car. And I was able to keep the stock k member with solid mount and exhaust that tucks n clears better than long tubes.
I'm not being sarcastic. I would really like to know.

NemeSS

iTrader: (127)

Ive had nothing but good results n happy customers w tc78s and haven't had a single failure yet. I give my customers a 1yr warranty on workmanship and parts.turbo included. Makes good hp n I can package easy in just about anything. I have an in house bender n make the full exhaust out of 3".
Spool w a tc78 is not an issue even on a 4.8 @7-8psi on sbe n stock cam trucks n cars w 60e n t56s.

rotary1307cc

iTrader: (5)

If you need the small footprint id be using something like a 66-70mm compressor on the 68mm turbine.

Doing more harm than good everywhere with that turbine trying to drive a 76 compressor

Be lucky to be able to max out even a legit 66mm wheel on that turbine

TT427

iTrader: (1)

So would an S366 at the TC76 price point be able to do this?

hbhc

iTrader: (8)

How does the TC76 physical size compare to a 366sxe?

95silvia14

iTrader: (2)

i went a head and talked with bw and ordered a pair of the 366sxe's with the .91 turbine housing let the good times spool

crashly

I had twin tc7268's
358 cubes
23 deg 230cc head
made 35 psi maxed out
7500 rpm

just add a touch more fuel to cool exhaust , as its alittle higher in bp
zero issues
just tune around it
easy