sleepy_boy1

Hi guys, i have a 2004 gto with a stock 5.3 engine with ls1 heads on it and am running the STS Turbo kit at 10psi, the car made 341 rwhp and i feel it should make much more.. what rwhp should i expect? my AFR is 10.3 at wot with meth

any ideas...

JRENIGAR

iTrader: (37)

Damn, I thought my dyno #'s were low. That sucks, Auto or manual? Any spark blow out? Does it feel faster than the stock combo, maybe the dyno wasnt loaded correctly or something? Post pics of the graph and maybe someone can help.

Ghostintheshell

Yeah somethings not right with that.

CarsandWomen

iTrader: (19)

where is your boost reference from? stick or auto?

sleepy_boy1

dyno was loaded perfect, 4000lbs for a 2004 gto, i have the a4, should i run without meth? im running at 5600rpm with peak hp at 4600rpm.. something isnt right.. no detonation all around with meth,

Frans96SS

iTrader: (15)

You mean 5.7 ls1?

projectX

iTrader: (51)

Something is def way off here.

TurboAv

iTrader: (6)

Converter locked or unlocked? How much timing? Stock exhaust manifolds or headers? What size piping to turbo? Which turbo and AR on exhaust houisng?

sleepy_boy1

i dont know about the converter, timing was 14 degrees, on the WOT area of the spark table, stock manifolds with the STS Turbo kit which has 2.5 inches to the turbo i think..

sleepy_boy1

im running a 5.3 iron bloc with ls1 heads to lower compresion

Professor_speed

iTrader: (8)

are you blowing through the converter? any signs of valve float? (what springs valve springs do you have? can you post the graph?

JAX04

iTrader: (17)

Again, where is your boost reference at for the wastegate?

Was the boost verified by an external gauge?

sleepy_boy1

the recorded run i with the tuner, ill try and get a hold of it tomorrow, what exactly do you mean by blowing through my converter? i have stocks ls1 valve springs as i do not exceed 5500rpms and i don't think i have valve float

sleepy_boy1

my boost reference is in the vacuum line that goes to the brake booster and my boost gauge is also connected there, that is where the STS kit fittings are provided.. should i move it the intake? would that make any difference? i seem to be hitting 10psi at around 3-4k rpms which seems normal...

HydroStream6

iTrader: (16)

Stock valve springs and 10 psi are a no no. Upgrade them.

Does the car have cats on it? Peak hp at 4600 is way off for a 5.3. What cam is in it? Post the dyno graph, you most likely have a couple different problems going on leading to one big mess.

TurboAv

iTrader: (6)

I will also echo getting better valve springs.

jeffreycastgsx

You have a 5.3 with low compression so dont expect to make a lot of power at just 10psi and that is way rich, dont see how the meth would even help then.

Seems like they tuned way safe, i doubt the meth even help with that little timing and boost.

Why are your revving so low?

Check for boost leaks.

slow67

iTrader: (2)

Most stone stock 5.3Ls dyno around 220RWHP.....

TurboAv

iTrader: (6)

I would toss a small cam in it also. Like an LS6, 224, or 228.

OneBad98Z

iTrader: (1)

Aren't the 5.3's like 9.5:1 with stock heads anyways?? Defenitely seems off my 4.8 with only a ls1 intake and the early ls2 can and springs makes 490 at 12 pounds and at about 5800rpms, 10.5lbs was 469whp if I remember correctly on 93 octane no meth and timing in the 12-15 degree range depending on how much the burst knock steals lol

Valve springs defenitely seem possible, and meth just seems overkill, my afrs were in the 10.4 range also, so I'm sure you have something holding you back..