Full boost at 5000rpm

[joshs84SVO]

why? i have a stock block with a big valve ported head,lunati cam with about .500 lift,T3/T4@20psi, stock intercooler, ported/gutted intake,stock TB,3" downpipe(let me know if you need anymore info.) It dos'nt hit full boost until about 5000,then i need to shift at 6000(7000 when i put the chip in, a little bit better)

[Gator]

Where is your timing ? ( Camm too )

What are the specs on the turbo ?

[freakos]

What are the specs on the turbo ?

+1, and check your hoses for cracks/loose clamps, maybe check your wastegate diaphragm(sp?)

[joshs84SVO]

the turbo says A/R.50 , before the head swap,boost was at 4000. With T3 it was at 3000

[Gator]

the turbo says A/R.50 , before the head swap,boost was at 4000. With T3 it was at 3000

I mean whats "inside" the turbo ?

and again, where is the timing ?

[GAboySVO]

What is the A/R on the turbine? Has the wheel been clipped? Do you have the stock internal wastegate setup or external?

[joshs84SVO]

i only know that it is a T3/T4 off of Ebay. stock waste gate

[SVOeric]

what got into the exhaust and clogged up the cat while you were rebuilding ?

[joshs84SVO]

what got into the exhaust and clogged up the cat while you were rebuilding ?

what?????

[Gator]

i only know that it is a T3/T4 off of Ebay. stock waste gate

OK, so here are my guesses seeing as thats about how much info we have to go on here.

1) Your T3/T4 is a PPOS. ( Especially if its an SSAutochrome Turbo and/or you bought it used. )
2) Seeing as how you havent answered the Q about timing, your timing is screwed up.

[joshs84SVO]

timing is at 10. i just dont know why it hits full boost at 5000 with new head and before with stock head it was at 4000.turbo worked great before

[SVOeric]

what?????

clogged exhaust will cause boost to come in late..

Also -- you need to read up on timing -- Cam timing, and ignition timing are 2 completly different things

[joshs84SVO]

no cat and i know the difference in timing