99camarosupersport

iTrader: (6)

I'm running a GT67 rear mount, a2a intercooled and it seems to take quite some time up into the rpms to spool. around 4.5k is where i'm making 5lbs at.
Car has LT's, and an slp aftermarket radiator so the engine runs around 180 constantly.
Is this normal....first turbo car here..

JAvenger007

iTrader: (9)

thats a bit high. Swap the LTs for coated manifolds and wrap the exhaust from the collectors back to the turbo. You can also try going to a 2.5" stock ypipe with no cats and swapping to a .81 a/r exhaust housing. A good boost controller can also aid a tad.

Also up the boost with that forged ls6. I would shoot for at least 8psi, and if you have 317s then 10psi shouldn't be a problem with that meth on top.

2000TurboVert

iTrader: (17)

Get rid of the long tubes, and find some stocker manifolds, You have a manual so you should have 3.42's... Get some 3.73's... Make sure you dot have any boost leaks

Im running 5psi and getting full boost @ like 2800-2900

bboyferal

iTrader: (9)

4th gear scenario (3.42's final drive):

3k rpm starts 1 psi,

byt 4k rpm 16/17 psi strong 'til 7k.

52172

iTrader: (2)

full boost by 3800 rpms

Slowhawk

iTrader: (12)

2k in my truck but the turbo is pretty small.

99Z28LS1

iTrader: (4)

i thought turbos like the load of a lower gear better?

RW99

Ditto that; I'd stick with the 3.42's. My T67 front mount (on a 347) is fully spooled to 11 psi at 3000 rpm.

RooRnZ28

iTrader: (14)

i would think you have a leak somewhere for the spool to take that long. i am in boost by 3k.

2000TurboVert

iTrader: (17)

Well theres a debate to that...

Its really personally preference....

Slowhawk

iTrader: (12)

Really matter's how much power you put out. Stock motor,5 psi then a 3.73 wouls probly be better. 800hp would like a longer gear like 3.42 or even 3.15's.

99camarosupersport

iTrader: (6)

Damn you guys making boost before 3k are really making me jealous, I've checked the piping for leaks but can't visually see anything, is there anyway to better check?

I bought the car pre-built, which kind of sucks as I'm not sure how it was put together or if any "short cuts" were taken...

2000turbovert, do stock manifolds as they come from the factory work best, or ported? I'll take a pic of the wastegate here in a bit, but there is nothing over it could that effect it at all.

bboyferal

iTrader: (9)

Yeah, but the people making full boost so soon are running smaller turbos.

****, when I ran MPT-70, I had full boost by 3k rpm starting at 2k rpm...

And that was with 3.73's from my NA days.

Now with the PT-76GTQ it jumped up to boost starting at 3k rpm to full on at 4k rpm, but now I rev to 7k rpm, too, so it's all the same to me.

99camarosupersport

iTrader: (6)

Yeah, but it shouldn't take 4.5k to build full boost...

If it was up to full boost at 3k I would be ecstatic, and I'd be happy with 3.5k

ABeasst

iTrader: (5)

My 383 w/ T76GTS makes full boost by 3500.

Thats in 4th w/ 3.42 gears hitting it from around 2K.

cablebandit

iTrader: (37)

ill log mine today...auto locked in 3rd...3.08 gears...408 with t-6 88mm 1.32 a/r
it spools much slower than the incons did but i am very happy with how linear it comes on...easier to control on the street

Speed

iTrader: (33)

Full boost below 2200 (9-11psi depending on how ballsy I'm feeling). My kit with a single T76.

99camarosupersport

iTrader: (6)

Hopefully I'll be swapping the LT's for some manifolds soon. The I pipe is wrapped all the way until the Y pipe, I ran out of ties and time when I started on it.
The turbo exits via a magnaflow bullet right now single out.
I'll recheck myself on any leaks today, but I really did see any visible weakeness the first time I looked, not really sure how to check a boost leak as I would have to be driving it building boost so I couldn't put soap or anything like that on to check it.

blacksi

iTrader: (3)

Newb here. Why do the long tubes not work as well as stock manis?

99camarosupersport

iTrader: (6)

My guess is the way the exhaust gases exit from headers, they come out in a "machine gun" bursts of air, versus a manifold all being one big blast plus they hold more heat than headers, is this correct or am is my *** talking ?