dean85gt

iTrader: (7)

Hey guys,

Ive done a ton of searching on this site and am trying to figure out what turbo would work well and be cost effective for my setup.

Im running a stock 5.3 with an 04 z06 cam and LS6 intake. Backed by a th350 and in a foxbody.

The cost of the BW S400 T6 83mm with 1.1 AR from forced inductions is very tempting. Ive done some research and looked at the turbo map and based on my calculations my setup with not even land within the efficiency range of the turbo (AT ALL). But it seems alot of guys are still running them.

Otherwise I can save up a bit more and go for the TC78.

I'll be running regular gas and an ebay FMIC with flipped truck manifolds.

Any help would be much appreciated.

dville_gt

iTrader: (5)

i am running the s475 t6 1.32 on my 6.0 and it has gone 114mph so far in the 1/8th. wouldn't be a great choice for a manual trans roll racer, but for an auto that' can leave with boost it is good.

831jd

iTrader: (3)

I talked to dr turbo he told me a s480 t6 would be a killer setup on my stock 5.3

fastazzls1

i have s380 and it works great the bigger the turbo is not always the best if you dont have exhaust voulme or proper camshaft proffiles also i have he s380 on 5.3 in an s10 with 317s and a custom camshft from bullet and the motor made almost 580 on 15 lbs its all in what and how you build the engine i have seen a lot of my friends buy s400 and sure the ARE CAPABLE OF MAKING MORE POWER but the engine just inst there so you will never get the full potential of the turbo charger

Sarg

iTrader: (6)

15 psi and only 580hp? There was a guy with an ebay gt45 making close to that with 6 psi...sounds quite low for a s380. What turbine did it have?

hellbents10

iTrader: (10)

A stock 5.3l only makes 235-240 to the tires so 580 on 15psi is just fine. I like the 400 chassis on a 5.3l with a 83mm turbine wheel. They work great and come on quick! The back pressure will stay in check above 600hp too, and it will be terrible with the TC unit.

Sarg

iTrader: (6)

Post 93, 355 with 18.x psi made over 900 at the crank. Given is has 30 more cubes and 3 more psi on e85, but it is also non-intercooled. I really think the s480 has good potential on a 5.3 that has a good intake, cams and mildly worked heads. I guess we will see. I am slapping on a s480 96mm turbine on my 5.3 in the next couple months.

http://www.yellowbullet.com/forum/sh...=443277&page=7

Hank Peabody

iTrader: (2)

Sounds like you're in for some disappointment. Almost 580whp at 6psi on a mild 5.3 with an ebay GT45 is fantasy land.

As for the Oz 964hp 355, theres 80hp in the extra cubes, another 80hp in the extra 3psi, so now your at 800hp at the crank with a 5.3. A good performing converter on the track can show a big loss on the dyno, so 580whp is not off at all for a 5.3 on 15psi.

2baditsnotachev

iTrader: (4)

I talked with forced inductions for a while and I feel comfortable with my s475 I went 83mm 1.10 t6. I was also looking at the tc78 but it would've cost a little more and the backpressure would be terrible with that tiny turbine. With auto cars I feel its always best to go with a big turbine. Good luck

Sarg

iTrader: (6)

No, he was at almost 500 at the wheels at 6 psi with a much smaller turbo (66mm ebay unit), a much smaller turbine that probably had huge backpressure compared to a 480. If 9 psi with a much larger turbo only yields 80 hp, something is not right. By your calculation above 3 psi is worth 80hp.....

Further he never said he had a big *** converter, but I kind of doubt a 220 hp loss to the wheels unless something is quite wrong. That would be over 25 percent. Even awd autos don't show that much on average.

Hank Peabody

iTrader: (2)

500whp at 6psi and a mild 5.3 is still fantasy land. The dyno is a hard pill to swallow after seeing all these inflated numbers floating around the internet.

Hank Peabody

iTrader: (2)

Is this the guy you are talking about? https://ls1tech.com/forums/dynamomet...urbo-6psi.html

You think 450whp is close to 580whp?

dean85gt

iTrader: (7)

Isnt the quickest stock bottom end running a TC78? Doesnt seem to be any backpressure issues there...

Anyways I was thinking of ordering the S400SX-75 ETT* 1.10 83mm T6 ($649) from forced inductions.....until I read that thread on them. ugh now where do I get one from?

LS1NOVA

iTrader: (12)

Quickest stock bottom is not a TC78. Its a Precision 7675. Billet compressor wheel and CEA turbine wheel. Rated at 1200 flywheel. At 24psi I bet he has some backpressure. That has a 75mm wheel. Little bigger than the 68mm in the TC78. I think he did have the TC unit on it before though, thats prob what your thinking of.

Remember that the Borg Warner states the size of their turbine wheel based on the inducer. Others use the exducer. So a S475 (advertised as 75/83) and a Precision 7675 (advertised as 7675) have very close wheel sizes. The BW just uses massive housings comparetively.

The TC76 and 78 are too small for anything over 600rwhp and 346 cubes IMO due to the small turbine wheel.

JoeyGC5

iTrader: (24)

I'm running a PT88, t4, .96 on my cam only 5.3. It's a little laggy down low in my truck, but I think a good converter and rear gear would make that real fun in a car.

Sarg

iTrader: (6)

First quote....thought it was a 5.3 but it was a 5.7 and 5 psi, not 6....not a ton of difference really. 21 CI from 325 to 346. I know several of the ones below are 6.0 and 5.7 liter motors, but you get the point. To me his numbers just sounded a little small. I didn't mean for you to get all hurt by it

Nitroused383

iTrader: (10)

What does a bolt on 5.3 make on the dyno? Seems a lot of bolt on LS1 cars are around 330-350 rwhp. I don't see a stock 5.3 making 580 on 6lbs. My motor made 580 on 6lbs with a tc76, but I also made 444rwhp in n/a form. I wish I dyno'd the 76gts at 6lbs but I only dyno'd it at 11.5 lbs and it made 718 rwhp.

Sarg

iTrader: (6)

Well the 4.8 that hotrod mag ran with bolt ons made 451 on the engine dyno....maybe 375 through an auto? Donno, never tried one.

Hank Peabody

iTrader: (2)

Its ok, just a little irritating when people with no experience themselves go around quoting everyone else trying to be an expert telling people who are actually doing it that their results are bad.

Sarg

iTrader: (6)

I have quite a bit, just not on the 5.3. 5.7, 4.6, 5.1, 6.6, 7.4. I am trying my first 5.3 motor out now, but quite honestly, a motor is a motor. Heck we made 550 at the wheels on a supercharged stock 4.6 liter with only 12 psi.