Torque produced by large streetport?

rotaryguy481 · 04-08-2010, 11:27 AM

How much torque and power does a large streetport produce

My5ABaby · 04-08-2010, 02:20 PM

Boosted? Intake? Exhaust? Etc. We need way more info.

FerociousP · 04-08-2010, 02:58 PM

Quote:

Originally Posted by rotaryguy481

How much torque and power does a large streetport produce

Think of it as changing heads and cams... It changes the whole powerband and is affected by a host of other things like 5Ababy says.

That's a pretty noob question. I expected more out of a name like "rotaryguy"

rotaryguy481 · 04-08-2010, 03:03 PM

Sorry bout that guys and yeah still alil new to the rx7 thing lol but it is s5 t2 3inch intake 3inch exhaust large streetport walbro 255lph fuel pump

T24TODD · 04-09-2010, 10:31 PM

Well its actually the opposite reaction you might think, The power changes less down low more up top. 5 to 7k is when it seems to really pull. MPG will also go down even more but hey its a sports car

rotaryguy481 · 04-09-2010, 10:35 PM

Sweet thanks a bunch guys

Max777 · 04-15-2010, 09:54 PM

Spend some money on a quality standalone and a good tune.... this will make the most advantage of the porting work...

also, don't quote me, but I've heard of people having issues with the porting being too large for the stock turbo somehow.

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?

04-08-2010, 11:27 AM	#1
rotaryguy481 Rotary Fan in Training Join Date: Jan 2010 Location: Fort Worth TX Posts: 74 Rep Power: 16	Torque produced by large streetport? How much torque and power does a large streetport produce

04-08-2010, 02:20 PM	#2
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	Boosted? Intake? Exhaust? Etc. We need way more info. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-15-2010, 09:54 PM	#7
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	Spend some money on a quality standalone and a good tune.... this will make the most advantage of the porting work... also, don't quote me, but I've heard of people having issues with the porting being too large for the stock turbo somehow. __________________ Rotaries:They are NOT that complicated!

05-10-2010, 11:56 PM	#10
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!

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04-08-2010, 03:03 PM	#4
rotaryguy481 Rotary Fan in Training Join Date: Jan 2010 Location: Fort Worth TX Posts: 74 Rep Power: 16	Sorry bout that guys and yeah still alil new to the rx7 thing lol but it is s5 t2 3inch intake 3inch exhaust large streetport walbro 255lph fuel pump

04-09-2010, 10:31 PM	#5
T24TODD RE_P ROTORs Join Date: Apr 2010 Posts: 8 Rep Power: 0	Well its actually the opposite reaction you might think, The power changes less down low more up top. 5 to 7k is when it seems to really pull. MPG will also go down even more but hey its a sports car

04-09-2010, 10:35 PM	#6
rotaryguy481 Rotary Fan in Training Join Date: Jan 2010 Location: Fort Worth TX Posts: 74 Rep Power: 16	Sweet thanks a bunch guys

05-05-2010, 08:53 AM	#8
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.