kylemm1002

iTrader: (6)

Starting to do some research for winter build with the new car. Plans are build the turbo kit this winter on my stock fbody then swap in my lq4 next year. I really only want to build the kit once and buy one turbo lol.

I was looking at an s475 seems like it would be a good size for the 6.0 but maybe a little laggy on the stock 5.7, which I'm ok with as long as you guys think it will still light about 4k???? Car will get the 6.0 with a tick custom cam next year.

Is there a better turbo that could work for both the 5.7 or 6.0? I'm open to options would like to keep the price around $900 for the turbo itself.


Next question on the c6/truck manifold. Looking to keep my ac. I'll be standing up my radiator using the same griffin everyone uses. Probably have to modify the ac lines if need be. I won't know till I get into it I guess. If I'm using the c6 manifold do I have to use a turbo k member if I'm going run front bumper down pipe? Car isn't a daily so I was thinking I could just dump the down pipe out the bumper instead of going back through the k member but I'm not sure if it's required using the c6 mani around the compressor.

Are all c6 ls2 and ls3 manifolds the same?

Thanks!

kylemm1002

iTrader: (6)

Also ment to add a tc78 in there as an option I was reading on. I know the tc78 is physically smaller unit not sure how it performs with a 6.0 though.

SPRAYED 01

iTrader: (22)

I have a 6.0, c6/truck mani, griffin rad stood up. The tc78 will fit with out standing it up, iv did that first when it was still a 5.7. Now with the tc you can get a 75mm turbine.

The bw unit is going to make a bunch more power over the tc but is physically huge.

What are your power goals?

If you are dumping out the bumper i don't think there is any need for an after market kmember.

kylemm1002

iTrader: (6)

What turbo are you running?

Goal for the 5.7 is what ever is makes on the gate spring lol. End goal for the 6.0 would be 700...maybe 800 if I get greedy.

HexenLord

There's about a 6% difference in displacement between a 5.7 and a 6.0, so don't expect a great deal more power or spool between the 2. Turbos themselves often dictate the power output, not the displacement. For example, there are 4 cylinders making 700+ hp on that same turbo.

Go with what is available and within your budget. Don't over think it too much. There are tons of guys in street driven 5.3s that are making your power goal and picked up their engine at the local yard for 300 bucks.

SPRAYED 01

iTrader: (22)

What's the gate spring going to be? Basically its going to be difficult to fit the bw turbo even with the radiator moved up, but possible. The bw will make more power and have less bp. If go with that.

Sarg

iTrader: (6)

Gate spring can be lots of different things from 3-21 psi. Most common are 3, 7, 14 psi springs, but you can also buy additional springs and combine them.

kylemm1002

iTrader: (6)

Sorry guess I didn't type that. Going for 7psi to start with on the stock motor. Would like to turn it up to roughly 17-18 psi with the lq4.

SPRAYED 01

iTrader: (22)

Ya either way get the bw if your going to stand up the radiator any way

Sarg

iTrader: (6)

It depends a lot on backpressure. If you get a smaller turbine, you will have more backpressure and it will blow the spring open before the advertised spring rate. An example might be a ten lb spring only netting you 7 psi if there is a lot of backpressure. What fuel will you be using? I would match the spring to your eventual goal if you are going to be running good fuel. If not size it small and you can usually add a different spring later.

mrstepheneades

I vote for the borg if you can fit one lol. I love my s475. Affordable as well and reliable. Only 650 dollars. Mine makes some good power and spool is starting good around 3800. 5psi by 3500!

c0ncEpT

iTrader: (4)

I'm partial to the S475 as I have one myself but they are physically large. I'm not sure how easy its going to be to plumb a T6 kit with a 4"+ DP and keep the AC. I'm sure its been done before tho.

Here is a picture of my old On3 76mm and the S475 to show you the side by side difference.

kylemm1002

iTrader: (6)

Thanks for the info! I like the price of BW also but open to suggestions of other turbos as well.

It looks huge in that pic lol.

I figured the bw would fit by standing up the rad and moving the battery to the back and front bumper exit down pipe. I was thinking mount it so the air filter would be right where the battery is located now and the down pipe across the front of the engine out the drives side front bumper.

kylemm1002

iTrader: (6)

Bump for any more options or comparison pics!

Sarg

iTrader: (6)

S480 T6

Mrmooney

iTrader: (9)

Do you have any other comparison pics of those two turbos?

c0ncEpT

iTrader: (4)

mrstepheneades

https://ls1tech.com/forums/staff-vehicles-showcase/617938-na-ty-turbo-ta.html

Check out his turbo location. Kinda like what your saying. You have to scroll down the page a little bit because he was super charged at first then he went turbo.

kylemm1002

iTrader: (6)

bump for more opinions because ive searched till blue in the face and with so much info out there im no closer to picking a turbo lol

Now I was reading that a pt7675 could be a good fit, but then the same thing the 6.0 will be choked out up top. But its over all size I could make fit pretty easy. Budget wise its at the very top of what im willing to spend on just the turbo. building the kit for pt7675 I could probably keep the stock condesor and modify the top ac line.
down fall is if I ever want to upgrade to a larger frame chances are ill have to modify my turbo kit, something im trying to avoid.

s475 budget wise is really killing me cause its cheap and proven! Especically when I have the 6.0 with a tick custom cam. And if I ever wanted to upgrade my turbo kit would already have a t6 flanged. Down fall is building the turbo kit will be tricky with keeping ac and fitting that huge turbo in there. If I go with the s475 ill prob have to buy an aftermarket condensor and to custom ac lines to clear everything.

Really dont want to spend more then $1200 on a turbo. I guess options are shell out for a better "packaged" turbo or save some money on the turbo and go s475 and spend more time/money making it fit my needs.

Whatcha think? Ive tried emailing forcedinductions with no response. Called and talked to him for a minute but could hardly hear him.

mrstepheneades

s475 here...... this was during my build.