All NA 20B owners
06-15-06 | 03:00 AM
#26
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Engines putting out 180 odd rwhp over here in a full weight first gen are running high 12/low 13 sec 1/4s
These are your simple 4k (AUD) 13B Bridge port engines
These are your simple 4k (AUD) 13B Bridge port engines
Last edited by Rotary20B; 06-15-06 at 03:24 AM.
06-27-06 | 03:52 PM
#27
Originally Posted by RETed
For a stock internal block with the stock intake, that was dead-on what my estimate was.
The header is not optimized.
We built the car like that just as a "intermediate" build.
The car is getting turbos slapped on it soon.
I estimated the power output to be 230 to 250.
We would've went higher, except we found out the damn air filter was too damn small - the AFR's jumped up one full point when we removed the air filter.
Oh well, we ran out of time.
There is NO 2-rotor that'll make close to 200 lb-ft of torque, period with similar mods.
If hp #'s are all that you are looking at, then it would stand to reason you are disappointed.
I have never seen one - stock internal block, stock intake.
I've only heard of Kahren's build which uses a custom intake to hit over 190 at the wheels.
I dunno why you're so hung up on horsepower.
It's the torque that makes this motor unique.
-Ted
The header is not optimized.
We built the car like that just as a "intermediate" build.
The car is getting turbos slapped on it soon.
I estimated the power output to be 230 to 250.
We would've went higher, except we found out the damn air filter was too damn small - the AFR's jumped up one full point when we removed the air filter.
Oh well, we ran out of time.
There is NO 2-rotor that'll make close to 200 lb-ft of torque, period with similar mods.
If hp #'s are all that you are looking at, then it would stand to reason you are disappointed.
I have never seen one - stock internal block, stock intake.
I've only heard of Kahren's build which uses a custom intake to hit over 190 at the wheels.
I dunno why you're so hung up on horsepower.
It's the torque that makes this motor unique.
-Ted
06-28-06 | 06:36 AM
#29
Car: '90 S5 RX-7 convertible
Engine: 20B stock everything, except engine management
Exhaust: custom dual built by Mitch Piper
EFI: Two Electromotive Tec-IIs
Diff: Stock S4
Gearbox: Stock S4
Power: 368 rwhp @ 6200 rpm, 425 lb. ft torque
Engine: 20B stock everything, except engine management
Exhaust: custom dual built by Mitch Piper
EFI: Two Electromotive Tec-IIs
Diff: Stock S4
Gearbox: Stock S4
Power: 368 rwhp @ 6200 rpm, 425 lb. ft torque
06-30-06 | 12:47 AM
#30
what do you guys think a 9.7:1 NA 20b would make streetported with the stock intake?
i have been planning on doing this in the near future, but if i cant make 300whp i'll probably not go to the trouble.
also, would i have to use timing split if i plan on keeping it NA?
i have been planning on doing this in the near future, but if i cant make 300whp i'll probably not go to the trouble.
also, would i have to use timing split if i plan on keeping it NA?
Last edited by jacobcartmill; 06-30-06 at 12:50 AM.
06-30-06 | 04:02 AM
#31
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by jacobcartmill
what do you guys think a 9.7:1 NA 20b would make streetported with the stock intake?
i have been planning on doing this in the near future, but if i cant make 300whp i'll probably not go to the trouble.
also, would i have to use timing split if i plan on keeping it NA?
i have been planning on doing this in the near future, but if i cant make 300whp i'll probably not go to the trouble.
also, would i have to use timing split if i plan on keeping it NA?
Just go 20B, you won't look back, its not just the outright hp, its the drivability, torque, sound, just ***** all over a twin rotor.
07-07-06 | 09:41 AM
#32
Senior Member
Joined: Nov 2004
Posts: 627
Likes: 0
From: Fallston, MD
I think some of you guys are forgetting about just how restrictive the stock intake is. It may be okay for forced induction, but it's horrible for an N/A setup. I think that's pretty clear, just by looking at the numbers of 20B's not using the stock intake setup. I think that if big power is your goal, you're setting yourself up for disappointment if you keep the stock intake.
480 hp, wow... got a video of it?
480 hp, wow... got a video of it?
07-11-06 | 04:06 PM
#34
Haltech Dealer
Joined: Jul 2002
Posts: 1,431
Likes: 0
From: Oshawa, Ontario
here is a start up video of our car. I have to get some better videos
http://videos.streetfire.net/search/...4839F711E4.htm
http://videos.streetfire.net/search/...4839F711E4.htm
07-11-06 | 09:15 PM
#36
ROTARD FOR LIFE!!!
Joined: Jan 2004
Posts: 1,039
Likes: 1
From: North Carolina
damn you people.. i want an NA 3rotor... Anyone got any links on how to Get/mod them?
NA IMO is soooo much better to do than Turbo. gime a 20B NA with a Nice Streetport and some supporting mods, and id be the happiest guy
who can say a turbo 13B or even a LS1 sounds as good as that PP'ed NA 20B(Nice btw)
NA IMO is soooo much better to do than Turbo. gime a 20B NA with a Nice Streetport and some supporting mods, and id be the happiest guy
who can say a turbo 13B or even a LS1 sounds as good as that PP'ed NA 20B(Nice btw)
07-11-06 | 10:06 PM
#37
It is a new world to do a n/a 3-rotor. Sure it may not have quite as much power as a 150 shot nitrous Ls-1, or as much as a 13B with 22lbs of boost. But you wont care at all once you fire it up for the very first time.
07-11-06 | 11:31 PM
#39
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by MrFC3S
looks really fun, but ill bet its not too budget friendly 
is the tourqe/power band good? do they have NA EFI?
is the tourqe/power band good? do they have NA EFI?
NA 20Bs sound awesome too, even an extend 20B will make more hp & much more torque than any big port 13B NA. When it comes to fuel consumption & drivability there is no comparison to a big port na twin rotor, having owned 13b bps for the last 8 years or so.
Power band.. well in mine you can take off in 3rd if you like, I normally take off in second, only using first for very steep hill starts (can still use second) or for tight parking.
NA Efi, you can use the same setup, just buy an aftermarket ecu like a Microtech LTX12
07-12-06 | 01:11 AM
#40
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Well just took some videos of the car with the stock intake, probably the last video of this setup.
Diff is on the way out so had to take it pretty easy on gear changes, hope you enjoy!
I am using this host tempararily until my ftp gets sorted out, shouldn't be long
Diff is on the way out so had to take it pretty easy on gear changes, hope you enjoy!
I am using this host tempararily until my ftp gets sorted out, shouldn't be long
07-25-06 | 09:42 AM
#42
Junior Member
Joined: Nov 2005
Posts: 16
Likes: 0
From: Malaysia
MAKE : MAZDA
MODEL : RX-7 SAVANNA
PRESENT ENGINE : MAZDA 20B ROTARY N/A
MODIFICATIONS :
VAZ-MAZ PERIPHERAL PORTING, 3MM RACE APEX SEAL, HIGH COMPRESSION ROTORS, BOSCH FUEL PUMP, CUSTOMIZED COLD AIR, VAZ-MAZ LARGE SECONDARY INJECTOR KIT, RACE PULLEY, IGNITION ROTARY ULTRA COILS, RACING SPARK PLUGS.
E.C.U. : MICROTECH MT-12
EXHAUST : VAZ-MAZ MANIFOLD & BOX
TRANSMISSION : STANDARD MAZDA 5 SPEED MANUAL
BRAKES : 4 PORT CALLIPER & 11 INCH DISC
SUSPENSION : TEIN
RIMS & TYRES : 205/50R16 FRONT & 335/45R17 REAR HOOSIER
BEST TIME : 11.4SEC @ 1/4MILE
SEPANG DRAG BATTLE IV, 2005
SEPANG INTERNATIONAL CIRCUIT, MALAYSIA
11.74SEC @ 1/4MILE
BFGOODRICH ASIAN MOTORSPORTS FESTIVAL 2004
CHAMPION IN N/A ABOVE 2001CC
POWER : 370BHP
GARAGE : VAZ-MAZ ROTARY PERFORMANCE, MALAYSIA
URL : HTTP://WWW.VAZMAZ.COM
MODEL : RX-7 SAVANNA
PRESENT ENGINE : MAZDA 20B ROTARY N/A
MODIFICATIONS :
VAZ-MAZ PERIPHERAL PORTING, 3MM RACE APEX SEAL, HIGH COMPRESSION ROTORS, BOSCH FUEL PUMP, CUSTOMIZED COLD AIR, VAZ-MAZ LARGE SECONDARY INJECTOR KIT, RACE PULLEY, IGNITION ROTARY ULTRA COILS, RACING SPARK PLUGS.
E.C.U. : MICROTECH MT-12
EXHAUST : VAZ-MAZ MANIFOLD & BOX
TRANSMISSION : STANDARD MAZDA 5 SPEED MANUAL
BRAKES : 4 PORT CALLIPER & 11 INCH DISC
SUSPENSION : TEIN
RIMS & TYRES : 205/50R16 FRONT & 335/45R17 REAR HOOSIER
BEST TIME : 11.4SEC @ 1/4MILE
SEPANG DRAG BATTLE IV, 2005
SEPANG INTERNATIONAL CIRCUIT, MALAYSIA
11.74SEC @ 1/4MILE
BFGOODRICH ASIAN MOTORSPORTS FESTIVAL 2004
CHAMPION IN N/A ABOVE 2001CC
POWER : 370BHP
GARAGE : VAZ-MAZ ROTARY PERFORMANCE, MALAYSIA
URL : HTTP://WWW.VAZMAZ.COM
