Buchhakj

Getting some opinions. I'm looking to achieve 500 reliable hp. I have plenty of space as it is going into a custom tube framed car.

My question is would you do single turbo or twins.

What size injectors would you run to run 10-12psi? 80s?

cptinjak

Really depends on what you're trying to do with it and your budget.

For a budget street car I'd put a single box unit s366 on it and call it a day.


Jack

Buchhakj

I'd also like to add I have a pretty nice assortment of fab tools and capabilities. All of the manifolds and such will be fabricated and tig welded in my shop.

cptinjak

So what's the application? What's the budget? Street car? Drag car? Road racing?

Jack

Buchhakj

The car will be a street car mostly. It will not weigh much so a ton of power is not needed. Guessing it'll end up around 2,000-2,500.

The budget is not set per say. I plan to build the car and engine over the next year or so. I have been acquiring parts lately. Motor, t56, suspension components, etc. I'd like to be reasonable though.

Streetracer09

iTrader: (1)

You may not even need a turbo for that man. do a 6.0 with some nice heads and a good custom cam.

cptinjak

For that low of a power level on the street, I see no real reason to go twins. Like I mentioned earlier, an affordable box unit s366 would fit the bill nicely. Might even be a little big. Depending on your budget you could have somethign spec'd to fit the bill exactly or go that route.

Jack

cptinjak

I'm chasing the 500whp NA goal on my daily driver right now. It would be way simpler and WAY cheaper if i had just bolted a turbo on to begin with.

Jack

Buchhakj

I have no desire to chase NA levels that high especially because I already have the 4.8 with low miles. I know these motors aRe stout. I guess I lean towards twins for the fact of it being a v8.

JoeNova

When even a single eBay turbo can make that power on a bone stock 4.8, it's hard to justify twins....

69-chvl

iTrader: (11)

This seems to make the most sense for 500hp. It should also run better all-around (off boost especially).

Buchhakj

There seems to be so much love for the bigger displacement motors. Don't get me wrong a NA 6.0 fully built would be awesome. But there is something about taking a junk yard 4.8 and making the same power barely built at all with a turbo. Not to meantion that beautiful whine a turbo makes.

Mike454SS

iTrader: (4)

I guess that depends on the size of the engine...it was easy in my LS3 Camaro. AI 275 CC heads, custom grind cam, good headers and good tuning...466 rwtq and 500 rwhp. Cost a lot less than a turbo...I've seen a lot of people claiming 500rwhp cam only on the LS3 platform...but I don't buy the numbers...and several of them that I've run into watched me pull away like I had 20-30 hp on them every time.

That said...my friend is building an all out high stall trans brake TH400 mud drag truck with a 4.8 and twins...going to be a blast!!!

Mike454SS

iTrader: (4)

The 4.8 is a nice stout bottom end...to be honest...if I was doing a junkyard turbo build, I'd probably go 4.8 over 5.3.

Buchhakj

Especially because I bought a 4.8 motor for $500 and the guy through in a 4l80e with converter. I am selling the trans to a guy Friday for $400. $100 for a complete ls style motor seems like a good start to me. Bought a truck harness and 0411 ecu for $75. Complete running engine for $175.

cptinjak

Happy dynos....

I have a stock bottom end LS1, and if I hadn't been able to do all the work myself (porting/milling heads and building a manifold) I'd already be well beyond the price tag of a huron speed turbo kit by now with a good set of heads and fast 102/tb, headers, cam/springs/stainless valves, longtubes, injectors, fuel rails, flycutting pistons, etc etc.

And at 500whp I'll be pretty much done N/A. An affordable turbo kit even on a bone stock motor would support 650+. It's all about your goals and priorities.

Jack

LS1-IROC

iTrader: (4)

Where's the "Like " button

Buchhakj

When running a single turbo do people try to have equal pipe length? I have seen some people swear it is needed.

cptinjak

At the limit, it can be helpful. In your application, don't worry about it.

Jack

JoeNova

If both sides of the exhaust go into the turbine, run it.