Should I Really Port it?
Thread Starter
Joined: Jun 2011
Posts: 805
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From: Syracuse,NY
Should I Really Port it?
I been asking this question to myself long time and i dont know what to do. Doing a S5 T2 Swap with gt35r/e8. goal 350 to the wheels. what should i do? medium street port? do i really need it?
so happy
Do you have the engine apart?
If you do, I would give them some work... clean up the intakes with out changing the port timming very much, make it a nice smooth entry with no lips. Open up the exhaust a little. Be sure to leave a bevel on the closing lip of the exhaust port. Plug the EGR tubes in the exhaut ports.
If the engine is in the car and you don't want to pull and build it, stock ports will work just fine...
If you do, I would give them some work... clean up the intakes with out changing the port timming very much, make it a nice smooth entry with no lips. Open up the exhaust a little. Be sure to leave a bevel on the closing lip of the exhaust port. Plug the EGR tubes in the exhaut ports.
If the engine is in the car and you don't want to pull and build it, stock ports will work just fine...
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Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Leave primaries almost stock. Just extend them up to older 13B (Cosmo, REPU, etc.) levels. I usually use the Mazdatrix 6 port template primaries for this.
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
Last edited by Aaron Cake; Oct 24, 2012 at 08:48 AM.
Thread Starter
Joined: Jun 2011
Posts: 805
Likes: 4
From: Syracuse,NY
Leave primaries almost stock. Just extend them up to older 13B (Cosmo, REPU, etc.) levels.
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit. I usually use the Mazdatrix 6 port template primaries for this.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit. I usually use the Mazdatrix 6 port template primaries for this.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
if you're not seriously worried about fuel mileage and only drive the car a few days a month, i was serious. power from 3850-9000, as well as that distinct intimidating sound. with a properly setup 35R the only thing you will sacrifice is some low speed drivability and an empty tank about 25% earlier. 
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
Last edited by RotaryEvolution; Oct 23, 2012 at 02:36 PM.
Leave primaries almost stock. Just extend them up to older 13B (Cosmo, REPU, etc.) levels.
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit. I usually use the Mazdatrix 6 port template primaries for this.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
Port secondaries slightly (for example, RB "street turbo" template) which opens them a bit sooner (2MM or so), extends them up a bit. I usually use the Mazdatrix 6 port template primaries for this.
Use RB street turbo exhaust template which extends the exhaust ports down about 3MM.
Great combination for that turbo, with no reduction in drivability or mileage (when properly tuned).
This or stock. If you have never ported an engine or aren't confident enough to do it, just leave it stock..
If you change the port timing or don't you should at least pay alot of attention to the flow from the runner, around the 90deg bend on the opening edge of the port. Round off the opening edge of the port, kinda like the leading edge of an airplane wing.
If your going to street port it, here is the special sauce. https://www.rx7club.com/rotary-car-p.../#post11265009 Go to post 44 in this thread check out the 1st pic with the template. If you are going to change the port timing, this is the shape I would suggest. It will provide you the most power with out eating side seals or negitivly affecting fuel comsumption at Idle/cruise. What he shows is very similar to how Re-Amemiya ports their side ported race motors.
Watch this video at 4:30sec and look at the template he uses, I wish I knew japaness the only words I understood were sideport and bridge port
Bridge ports are for race cars, if your going to street drive it don't. If you care that much about impressing others with your brap brap sound as you sit at a light or roll through a parking lot, go find a rock and smash you skull into it until your dead. Now if its a race car bridge it out.
If your going to street port it, here is the special sauce. https://www.rx7club.com/rotary-car-p.../#post11265009 Go to post 44 in this thread check out the 1st pic with the template. If you are going to change the port timing, this is the shape I would suggest. It will provide you the most power with out eating side seals or negitivly affecting fuel comsumption at Idle/cruise. What he shows is very similar to how Re-Amemiya ports their side ported race motors.
Bridge ports are for race cars, if your going to street drive it don't. If you care that much about impressing others with your brap brap sound as you sit at a light or roll through a parking lot, go find a rock and smash you skull into it until your dead. Now if its a race car bridge it out.
We are what we think
Joined: Aug 2012
Posts: 73
Likes: 0
From: Kernersville NC
if you're not seriously worried about fuel mileage and only drive the car a few days a month, i was serious. power from 3850-9000, as well as that distinct intimidating sound. with a properly setup 35R the only thing you will sacrifice is some low speed drivability and an empty tank about 25% earlier.
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
I made a dumb mistake and went back and edited my original post a minute ago. I meant to use the Mazdatrix 6 port PRIMARIES on the PRIMARIES, and use the RB street turbo on the secondaries.
The Mazdatrix 6 port primaries have the same timing as early 13B engines. Doesn't open the primary any further but does extend the closing considerably. More chamber filling because of this, more low end. I think TII closing time is actually similar to this, while NA closing time is earlier (this is from memory, might be wrong).
The Mazdatrix 6 port primaries have the same timing as early 13B engines. Doesn't open the primary any further but does extend the closing considerably. More chamber filling because of this, more low end. I think TII closing time is actually similar to this, while NA closing time is earlier (this is from memory, might be wrong).
Thread Starter
Joined: Jun 2011
Posts: 805
Likes: 4
From: Syracuse,NY
Is this the right one for exhaust ?
RX7 1986-1992: Engine - Porting Tools: Porting Template - Streetable Exhaust 13B -
i cannot find a 6 port template for secondar from rb
RX7 1986-1992: Engine - Porting Tools: Porting Template - Streetable Exhaust 13B -
i cannot find a 6 port template for secondar from rb
Rotary Enthusiast
Joined: Sep 2010
Posts: 827
Likes: 12
From: new zealand
if you're not seriously worried about fuel mileage and only drive the car a few days a month, i was serious. power from 3850-9000, as well as that distinct intimidating sound. with a properly setup 35R the only thing you will sacrifice is some low speed drivability and an empty tank about 25% earlier.
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
whenever you hear a bridge roll by you can't help but look, i swear it's a natural reaction.
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iamsisyphus
2nd Generation Specific (1986-1992)
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Sep 27, 2015 01:42 PM
13a, 13b, 1986, amemiya, drivability, fd, gxl, port, rx7, street, streetport, strretport, t2, templates, tuned
