GT30 - Too laggy for street use ?

[mambastu]

Hi all,

Would a 600hp GT30 with 1.06 exhaust housing be too laggy for street use on a RB25DET in an S13 with the following modifications :

Adjustable exhaust pulley

Ported head with standard compression

Modified standard cast iron exhaust manifold with 45 mm wastegate

3" downpipe and exhaust system

Trust plenum

Front mount intercooler with 2.5" pipework

Twin plate clutch with flywheel

Any idea roughly what rpm I could expect full boost and do you think it would be more or less laggy than a 'modified to fit' standard GTR twin turbo setup ?

[Skyrine-Dave]

thats a pretty big exhaust housing...

[mambastu]

I was looking at the .82 housing originally but this 1.06 has come up for sale. I thought it was probably oversized for street use.

[meggala]

yeah it will be laggy the .82 would be better.

but the big one will have advantage why not look to see if you can get a .82 housing only to fit on to this one your garret dealer might be able to do this.

with the .06 you probably wont get full boost till 6 k rpm could you live with that

meggala

btw I'm not a turbo expert

[lukevl]

If you didn't live in the UK, I would swap my 0.82 for the 1.06...

[mambastu]

Originally posted by lukevl

If you didn't live in the UK, I would swap my 0.82 for the 1.06...

DOH!!