LS1LT1CAM

So other then nitrous is there ant other way to get this thing to spool up at the starting line any faster

The motor is a stock 5.3 with head studs and ls6 cam

have two step low set a 3750 and trans brake at 4500 stalls locks up a 4700

I was on the low speed for 4.5 secs and on the trans brake for 2.5 secs and only made 4 pounds of boost and it took 1.8 secs into the run to increase from there

Air/ fuel is 13.8 on the brake and had 24 degrees of timing till 6 pounds of boost

please help with suggestions

other wise it is going to get a 100 shot for 3500 to 5000

got-a-ls1

iTrader: (12)

man thats a big turbo for a stock 5.3. maybe get a custom cam to help spool? surprised though sitting on the 2 step gets only 4 pounds. sitting on the brake i think id shoot for a lower afr... the hole idea of a 2 step is to get unburnt fuel into the exhaust and combust right before the turbine (or in the turbine?) more fuel the better to a point. Also im definetely no expert but ive researched that lower timing can also help spool because it makes a less efficient burn in the chamber and more raw fuel into the exhaust..

atomic 6

what size exhaust housing??

got-a-ls1

iTrader: (12)

on the garret website it shows all gt55 models with a 1 a/r. i was assuming there isnt an option to change that since its not listed. could be wrong though.

atomic 6

I see the T5 with .9, 1.0, 1.12, 1.24,and 1.40

These may be only available from PrecisionTurbo, but I doubt it.

atomic 6

I just looked and the Garrett site says,

Five free float, non-wastegate turbine housings available.

http://www.turbobygarrett.com/turbob..._769115_1.html

craig382ci

iTrader: (5)

I agree with got-a-ls1. That's really to big of a turbo for a stock 5.3. If you had more cubes that would help you out the most. IMO that is. Build your engine around the turbo. A bigger turbo is not always better if don't have the engine to back it up.

Nitroused383

iTrader: (10)

Add another 10 degrees of timing and shoot for 12.5-12.8 afr.

HydroStream6

iTrader: (16)

Switch to E85 if you can. More exhaust volume.

chuntington101

Quick spool valve?
Coat and wrap the headers / exhasut parts?
More aggresive 2 step?
Higher stall?
Taller Gears?
Get some weight out the car? (wont help spool but will help the car get off the line)
More timing in low boost (as said above)?

Cant really think of anything else right now, and the above might not be suitable.

Ta,

Chris.

Pro Stock John

iTrader: (34)

I know someone who could help you come up on the transbrake better, email me at john@motorsports-media.com and I'll give you his info.

black06g85

iTrader: (6)

whats your timing retard on the 2-step.
my old car (small motor, semi big turbo) like @-15 to -20 degree on the box. Used to build a good amount of boost off the line.
plus it makes good fire lol

Sarg

iTrader: (6)

I was about to say, lower the timing and richen it up and drive those egts up to help get that thing spooled.

koolrayz

iTrader: (26)

There are two schools of thought on spooling both can work. You are smack dab in the middle. I go to the dead lean school. When on the first step I am about 16to1 A/F and
40* of timing. even on the TB I am at 13/1 and 30* timing
You also need to makw sure you have the 1.00 AR or you will never spool it. Call Tial and talk to them if you are at all unsure

Sarg

iTrader: (6)

16:1 and boost scares me a bit...just my .02

koolrayz

iTrader: (26)

I have ran that engine for two years doing just what I posted. I had Kurt urban look it over last winter as I was swaping to a better set of heads and he said bearing, rings everthing looks great. Your experience at this is what again?

Sarg

iTrader: (6)

Double post

Sarg

iTrader: (6)

Been tuning cars for about 10 years and have not lost a single motor that my partner built (or a stock one for that matter) in those 10 years of tuning with the exception of one that a guy was beating on with only 1 quart of oil in the motor. He spun a bearing.

I admit I am new to the LS motors though. I am here to learn.

I am not saying what you are saying is wrong. I am sure it will work. But boost + 40 degrees of timing and 16:1 afr is scary to me. I just would not feel comfortable with that.
How about you?

smokinHawk

iTrader: (48)

would a spool valve work with the turbo?

DrTurbo

iTrader: (3)

We have the Journal bearing GT55's with ALL the GT55 housings.....from .90A/R to 1.40A/R