savageboy69

finally found a 5.3 yesterday 80k miles, got it with harness and ecu for $800, not the best deal but im happy with it. Got it home and popped the valve covers hoping not to see massive amounts of sludge and to my suprise it looked very clean, looks like someone may have taken care of it. The plan is a 76mm turbo ( not sure which one so im open to suggestions) 60lb injectors and a cam. Im looking for 500-550 ish whp. Also want to get a ls1 intake or maybe a aftermarket, this is my first ls motor and first turbo build so im goin to take it slow. Gonna keep my eye on the classified section here and hopefully be able to find every thing ill need.

savageboy69

after doin research i think im gonna go with the ls6 instead, so if anyone has one they may be looking to get rid of let me know please

Mike@Diablosport

iTrader: (2)

You're on the right track with the LS6. What vehicle are you planning to drop this in?

savageboy69

its goin in a 69 chevelle, fully back halved , coil overs ladder bar suspension, should be a nice street strip car, thinking i will also go th400 with a trans brake behind

Blackpanther99

iTrader: (8)

Should be a beast man.

savageboy69

i cant wait, im hoping for around 550hp at the wheels, its not gonna be a hp monster but should be respectable. still working on what turbo im gonna get though

2muchboostNY

iTrader: (8)

^^^^Ebay GT45? Seems to be making good power on the 5.3 and is super cheap.

jonahs_supra

im doing a similar build
just got my 4.8 swapped into my supra and running on e85
was going to do nitrous but have decided to go turbo
from my research and talking with a bunch of people(including my gm tuner)
we agreed on a 76mm turbo, 80lbs injectors, -8 feed and possibly be able to keep my walbro 400 intank pump(this would be the down side of the fuel system)
806 heads ported, 571 lift cam 114 LSA, ls1 intake, hooker cts-v manifolds(supra frame rails are narrow with a v8 ), zr1 headgaskets, studs etc

As far as turbos go
I had a gt45 ebay turbo at 1 time trying to place it in my engine bay but the sucker is so big I'm going with a on3 76mm turbo

Going for 600hp or more

savageboy69

the gt45 is bigger than the on2 76mm? i thought it was the other way around, and i thought the gt45 would be too small for the 5.3, what kinda numbers are people putting down with the gt45?

astross89

iTrader: (7)

I would like to know also. trying to chose between the two. on3 76mm or the gt45. 500-550 rwhp

Blackpanther99

iTrader: (8)

With a GT45 youll see 500RWHP any day.

Sarg

iTrader: (6)

I have never held the gt45, but I can tell you the on3 looked like a baby turbo next to my s480!

HRHohio

Physical size comparison...

This post ( https://ls1tech.com/forums/forced-in...5-vs-76mm.html ) (halfway down) shows the physical size of a DNA Motoring GT45 (69mm) turbo http://www.ebay.com/itm/GT45-HUGE-V-BAND-1000-HPS-TURBO-TURBOCHARGER-CAMARO-GT-/150581666321?pt=Motors_Car_Truck_Parts_Accessories&hash=item230f5de211&vxp=mtr compared to an On3 76mm turbo

The DNA Motoring GT45 has a 69mm compressor and a 77mm turbine vs the ON3 76mm turbo with a 76mm compressor and 65mm turbine



This post (https://ls1tech.com/forums/forced-in...turbo-yet.html ) (halfway down) shows the physical size of a GT45 (68mm DNA Motoring) turbo vs a GT45 (80mm CXRacing (also known as Magnum 80 Turbo)). http://www.ebay.com/itm/CXRacing-GT45-GT45R-Ball-Bearing-Turbo-Charger-80mm-wheel-T4-1-15AR-Big-Power-/181106806132?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a2ace8d74&vxp=mtr
The CXRacing GT45 80mm turbo has a 80mm compressor and a 77mm turbine.

We have to be careful when talking about a GT45 Turbos because they are not all the same.

Hope this helps.

savageboy69

thats what i was looking for thank you, im still goin back and forth between both of em, just unsure which to get

savageboy69

well i said screw it and ordered the ebay gt45 and the cxracing 40mm wastegate today, still gotta find a ls6 intake and some 60lb injectors

2muchboostNY

iTrader: (8)

Ah I apologize for not specifying...still new to this V8 thing . ^^^let me know how it works out and good luck sir.

astross89

iTrader: (7)

im doing a very similar build in a 68 camaro. I am new to turbos. but for your power goals I would skip the ls6 intake and use the money for a good set of springs. (only if this is a budget build like.mine and your using stock heads)

savageboy69

mines goin in a 69 chevelle and i dont think the stock hood is gonna clear with the truck intake, and im probably gonna get a cam along with new springs

HRHohio

LOL. So which ebay GT45 did you go with?

HRHohio

Either LS1 or LS6 will work fine for what you're doing (Forced induction). If you were going NA, I would say hunt down an LS6 intake, but for FI you could save the $$ and put them elsewhere, like a good boost controller.

I'd say skip the 60lb injectors and go straight to 80's. Siemens Dekas.
You'll thank me later.
http://www.ebay.com/itm/1998-2001-2003-Camaro-LS1-Siemens-Deka-80LB-High-Impedance-Injectors-EV1-Set-8-/261249921026?pt=Motors_Car_Truck_Parts_Accessories&hash=item3cd3b57002

Don't forget a good fuel pump:
http://www.ebay.com/itm/WALBRO-F90000262-400LPH-UNIVERSAL-RACING-FUEL-PUMP-IN-TANK-W-INSTALLATION-KIT-/170920168201?pt=Motors_Car_Truck_Parts_Accessories&hash=item27cba2cb09&vxp=mtrThis will meet your fuel needs up to 600 easilly.

If you plan to ever go E85, go with this one instead:
http://www.ebay.com/itm/WALBRO-E85-RACING-FUEL-PUMP-F90000267-450LPH-IN-TANK-W-INSTALL-KIT-/170945680470?pt=Motors_Car_Truck_Parts_Accessories&hash=item27cd281456

Also, you will need to upgrade your fuel wiring harness, otherwise you will burn out your pump.
http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=
Call Racetronix and they can help you get what you need. Tell them you need the "Big 3".