Hello all: I have a brand new stock 2002 5.3ls motor and I installed a china GT45 turbo with a Air to water intercooler,80lb injectors and 1218 PAC valve springs, 50mm wastegate 50mm BOV, 862 heads, 2 bar MAP sensor, Right now it has made 10lbs of boost but I think I want to kick it up to 15lbs with the intercooler. GT45Aftermarket Turbo Replacement
Compressor:
Trim: 69
A/R: .66
Inducer: 68.7
Exducer: 97.8
Turbine:
Trim: 92
A/R: 1.05
Inducer: 87.4
Exducer: 77
Turbo Flange T4
Downpipe 3.5" V-band Flange
Intake 3.75" Inlet, 2.25" Outlet

What all do you think this set up will put out to the rear wheels. It has a 5 speed standard trans and all C4 vette suspension with 275/35/18 tires in the rear. Very tall gearing though. 160mph in 4th gear.

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Slick setup!

GT45’s usually tap out around 650whp on auto trans LS stuff from what I’ve seen. Defiantly more in it, should do 15lbs no problem. I’d guess 18-20 it would start to peter out.

 

Very cool thanks for the info. I hope to hit the dyno again soon and get a better tune with closer fuel curve and timing curve. Hope the trans holds up.

 

sweet ride man

 

I added a air to water intercooler to help with heat soak problems and keep HP the same as the motor gets hot. Here are some pics.

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Dyno numbers only 10 lbs of boost and 91 oct. 418 hp and 421tq. bone stock 5.3 with 630cc injectors and 1218 valve springs. 68mm turbo. 5 speed standard trans.

Does anyone know what a stock clutch will take?? nv3500 trans.


also thinking of going to 14 psi boost??


Thoughts???

 

My buddy has a 5.3 gt45 z06 cam making 406 to the tire at 8lbs through a 4l60e w 4.10 gears. I would stick a better cam in that thing, probably pick up 50 hp or better at the same boost.

Love the set up tho.

 

I just changed the wastegate spring to a 14 psi one I will see how that works.

 

Wow what a difference... Before it was pretty good but now it is a bit of a shocker. My tune is good for 15psi because I only have a 2 bar map sensor. I will run this pressure for a while and see how it goes. This boost sh*t is addictive.. More More...

 

Watch those plugs and sneak up on timing on pump gas at those levels... Things get really fun with a 4 bar sensor!

 

I hate to say it but I think I am good with where I am at with it as it is.. I do not have any heavy duty parts behind the motor to keep things together with much more power. Stock clutch, Light duty 5 speed trans and a dana 36 independent rear end. It is just a matter of time till one or all of them let go.

 

are you gonna take it to the track ?

 

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I took it to the Goodguy's Auto cross here in AZ a few weeks back. Needless too say many people were shocked at how well it handeled and how fast it was. Rusty looking car going fast.