Which turbo for 350whp on a 13BT

[classicauto]

T04E-57 trim. Old school 350rwhp. With a good manifold/wastegate and some sewer pipe exhaust you should have full boost by the 3500 range easily.

[RETed]

Originally Posted by vex

Having a manifold as described above I can tell you that I hit positive pressure as low as 2,500 RPM and can achieve my full boost pressure around 3,000 RPM (and this was on a horrible crappy tune).

"Hit positive boost" doesn't mean anything...
Garrett GT-series BB CHRA equipped turbos can regularly hit a couple psi of boost right off idle.
I posted full boost RPM's as a more relevant stat.

I believe the 60-1, O-trim was into positive boost at around 2,500RPM also...
I'll go double-check the dyno graphs (the Dynapack was also logging MAP during all runs) for confirmation.


-Ted

[vex]

Originally Posted by RETed

"Hit positive boost" doesn't mean anything...

I was just giving my personal experience on your posted numbers. Nothing more nothing less.

Garrett GT-series BB CHRA equipped turbos can regularly hit a couple psi of boost right off idle.
I posted full boost RPM's as a more relevant stat.

I believe the 60-1, O-trim was into positive boost at around 2,500RPM also...
I'll go double-check the dyno graphs (the Dynapack was also logging MAP during all runs) for confirmation.


-Ted

Can't get you any of those numbers as I haven't had an opprotunity to get onto a dyno yet. I imagine however that they will match your previously posted numbers without issue.

[Monkman33]

If you want spool, go with the smallest turbo that will make the power you want without being too inefficient.

Going bigger than you need only moves your powerband further up the rpm range. Nothing more.

[RETed]

Originally Posted by Monkman33

If you want spool, go with the smallest turbo that will make the power you want without being too inefficient.

Going bigger than you need only moves your powerband further up the rpm range. Nothing more.

Not necessarily...


Another tip...
Your wastegate (actuator) vacuum source location can also influence boost.
Closer to the turbo (compressor) = faster reaction of wastegate = slower boost
Farther away from turbo (compresser) / closer to engine = slower reaction of wastegate = faster boost
Boost builds from the turbo (compressor) then into hot-side IC pipes then intercooler then cold-side IC pipes then throttle body / intake manifold...
The later you open the wastegate, the faster boost will build in the turbo.


-Ted

[85rx-7gsl-se]

Thoughts on incorporating a Sound Performance Quick Spool valve?