quicksilverado

iTrader: (8)

Purevil on ls1tech put down over 700 rwhp with an STS kit. He has since swapped to another kit and a stroker motor. He changes his set up every year. He said it made more power than his previous procharger system.

kbracing96

iTrader: (26)

Just because no one has done it, doesn't mean it cant be done How much motor are you using to spool it? Just your 5.3? Your going to need a good motor to support a big turbo like that. Just because you put a big turbo on, doesn't mean it will make big power, you have to have the complete package. The turbo is only one part of the system. A rear mount can make some good power with the right parts.

02sierraz71_5.3

iTrader: (2)

with the right heads and cam I think a 76 would work well on a 5.3 Ive got a 3k stall anyhow to make up for some of the lag. It would put max power up around 5500 but thats ok with some good heads I think it could put out 600+ rw on boost around 10psi.

vanillagorilla

iTrader: (1)

What kind of power are you making now? Any timeslips? That will give a good idea of what can be added to your current setup.

F8L ran low 12's with his STS setup and a 5.3. He had 317 heads on it, but other than that I think it was a stock engine save for a cam (duh).

Front or rear mount you can't stick a ginormous turbo on there and expect to make big #'s everywhere. It'll be like a supra. Peaky powerband, won't et for **** and it'll mph like hell. Not a good idea in a 2.5ton truck.

I say a GT67 will get you damn close to 11's with 15psi and a 76 would get you there. A 6.0 and a either of the turbos could get you there too.

02sierraz71_5.3

iTrader: (2)

I run consistently from 8.8 to 9.0 1/8 NA with a heads and cam 5.3 rwhp from the calculators is around 350 to 400 rw figuring 5400 to 5600 weight. When I started this that was my goal NA now Im bored with it.
Realisticaly on a dyno Id epect it to be 320-350 stall soaks up alot.

When I do this Im gonna swap heads and cam thinking a set of the new darts would be nice when they start making em with a bigger CC. Reverse split cam 226/222 higher lsa low overlap .58x lift
12's have been done on a turbod 5.3 ext cab z71 so my goal would be mid 11's
If I were to go all out id build a large 4" bore motor with a short stroke titanium valve train and turn it about 7k+ with some huge heads, big cam and boost it would be rediculous but thats an all out race app and not something I want in my daily. I havent given up on the notion of a 402 I just dont like how long the stroke on those motors are for a higher boosted app thats asking for problems without a very stong bottom.

parish8

iTrader: (6)

a t76 would be prety laggy on a 5.3 no matter where you put the turbo.

i disagree about something said above about a big turbo not geting a good ET but geting a good mph. a big turbo will not be as much fun to drive everyday but you will be able to get a good ET with it. it just might take a little bigger stall or 5-10sec's of brake stalling to get it to launch under some nice boost.

vanillagorilla

iTrader: (1)

I meant TOO big of a turbo for an engine. Like supra dorks that put +100mm turbos on thier 3.0L in order to achieve a ceartain hp goal. A T76 is big for a 5.3 but by no means TOO big. Either way you could just spray it to get it spooled.

trtturbo

iTrader: (25)

big numbers are there to be had. We built a mild 5.3 and made 650 on one dyno run. It was a punched out 8.8:1 5.3 with forged rods and pistons, LS6 cam, stock #317 heads with LS6 springs and a GT-67 running 15psi.

02sierraz71_5.3

iTrader: (2)

I want something fun on the street not just track minded
didnt you say you had a 76 on your 408? How did it feel on the street?

Another thing where do you shift at? What sort of cam are you using?

trturbo:what do you mean when you say punched out?bored over? I noticed the compression is lower than stock, did you do that just with bigger CC heads? Transmission? 650-700rw is what i need to get where I want to go. Hows about a dyno sheet on the 5.3

parish8

iTrader: (6)

a t76 on a 408 is NUTS, it spools instantly and makes insane amounts of TQ nearly instantly. if you want fun this is fun.

as far as shift points, when i was running lower boost like 10-14psi i wouild let it shift prety high, 6200-6400. once i turned the boost up higher the turbo started to run out of steam up high so i moved the shift points down. at 16-18psi i ended up shifting around 5500 because the turbo couldn't feed the motor up there.

a t76 is a prety small turbo for a 408 but if you are ok keeping it under 600hp and want fun and tons of low end tq then it is a great combo.