Torque produced by large streetport?

T24TODD · 05-05-2010, 08:53 AM

there is no problem running the stock turbo with any size porting but like stated above the band will change. Only downfall of doing a nice size port with a stock turbo is controling boost. It will spike and be incosistant with the stocker 8-15-11psi pulls with mbc set @ 10 if I remembered my setup for awhile. this was with 30mm ported s4 wastegate and clipped turbine wheel on s4 t2 with agressive streetport.

sbrian2 · 05-05-2010, 02:38 PM

Yep, just the opposite as street ported engines typically have less torque.

Exhibit A:

This is the same car (FD, 13B-REW, B&R twins), with all the same mods on both pulls. The only difference is the first dyno run is on a street ported engine, the second dyno run is on an engine with minor porting just to clean up the casting. Which would you rather have?

Max777 · 05-10-2010, 11:56 PM

The two maps are the same?

05-10-2010, 11:56 PM	#3
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	The two maps are the same? __________________ Rotaries:They are NOT that complicated!

05-05-2010, 08:53 AM	#1
T24TODD RE_P ROTORs Join Date: Apr 2010 Posts: 8 Rep Power: 0	there is no problem running the stock turbo with any size porting but like stated above the band will change. Only downfall of doing a nice size port with a stock turbo is controling boost. It will spike and be incosistant with the stocker 8-15-11psi pulls with mbc set @ 10 if I remembered my setup for awhile. this was with 30mm ported s4 wastegate and clipped turbine wheel on s4 t2 with agressive streetport.