widge

Hey Guys,

when i purchase my larger turbo i want to raise the limiter, below are the only mods i have before purchasing the turbo

GSC S2
Titanium Beehive Spring upgrade with 4340 Chro-Molly Seat
Intake
Exhaust
Pump
8MR BOV

So the block is internally standard at the moment, do i have to change anything in the block to raise my limiter to say 8000-8500rpm?

vint21

iTrader: (1)

The upper limit of an engine's operating speed is generally determined by the air passing by the exhaust valve - it eventually goes sonic and the valve becomes a choked nozzle (Mach # = 1). Running faster than this won't matter because the airflow into the engine no longer increases linearly. Having larger intake valves or more lift will delay this effect.

There is also the issue with valve float where the springs can't keep up with the engine speed and thus the valves don't actuate correctly. Your upgraded valve springs should help with this.

So, um, there are no issues with the block.

widge

Awesome so what your saying is basically ive done what needs to be done to raise the limiter if need be....

Cool lol