Many of you already know the car, but here is a quick overview for those who don't.

20b series C engine, 9.7:1 rotors balanced by CLR, Semi p-port, ceramic apex seals, mazdacomp drysump, Custom inconel header, custom slide throttle intake with mechanically staged peripherals. 3 x id 550cc 3 x id 1000cc 3 x 270cc injectors. Electromotive TEC3R ecu. 5.5 tilton triple disk clutch, taylor flywheel, T5 g-force dogox transmission.

Lots of work to get here, and shooting for more over winter! Thanks for everyone supporting us at Defined Autoworks! Check out www. definedautoworks.com for new updates and products.









Video



Dyno Chart

 

What rpm do you have the secondaries staged in at?

 

Just using my foot, at half throttle it will begin to open the p-ports. On the dyno I opened them at 5k or so.

 

Holy. Fleurking. Schnit.

 

Was there something specific you did differently to get the extra 50rwhp? Probably top secret? Congratulations! That is impressive.

 

Its like most people say, the little details add up. Some stuff is really proprietary, but those things are responsible for maybe 5-6% of the power. The rest was in very specific intake and exhaust lengths. And working with the p-port vs sideport intake length so they resonate together.

And thanks!

 

congratulations, man! kudos to you. i live vicariously through your every stride (and setbacks, too), but this is truly a testament to your knowledge, skills, time and dedication.

 

I have a question regarding the fuel injector arrangement. How do you have the regulator set up, given that some of the injectors spray above the throttles and some below?

I'm contemplating a similar setup, primaries in the stock location, with the secondary injectors spraying into the throttle body, but figuring how to reconcile the regulator has me stumped. I guess I COULD just make sure to stage the injectors when manifold pressure is close to atmospheric, but somehow that still just seems improper.

 

You have any more pics of your slide throttle bodies or info on them? That's if you would like to share it of course...

I built a pair myself while while in school for machining as a learning process. But I got stuck at the return spring and TPS set up. Any tips would be a big hep.

 

475rwhp 20B n.a? Id never go turbo. Great job

 

Thanks Diabolical Glad you have enjoyed the work. Means a lot to me!


I just ran the fuel rails in series, one feed one return to the aftermarket regulator. I staged the external injectors based off rpm so by 5000 or so they were matched on milliseconds to the primaries.

 

Thanks Diabolical Glad you have enjoyed the work. Means a lot to me!


I just ran the fuel rails in series, one feed one return to the aftermarket regulator. I staged the external injectors based off rpm so by 5000 or so they were matched on milliseconds to the primaries.




I can take some more pics. There are a few ways to setup a TPS on the slide throttle. I took the easy way out and used a second gen TPS. They work linear. Return spring setup... well go to youtube and type in defined autoworks slide throttle. It has a video showing operation.

 

good god, that is awesome. it's too bad that torque curve couldn't come up more. are you running pump gas or ???

 

Thanks! It is on pump gas. Tried race gas and lost a bit of power. Torque is very high actually for the given displacement and rotary tax. A engine going to 10k is always going to have almost half the torque vs hp due to a function of math.

 

I never thought of using an fc tps. The tps use i was going to use cost over 200 dollars each. it was basically just a linear potentiometer similar to ones used on suspension adjustment setups. Ill check out the videos. Thanks.

 

Wow!! Congrats on the numbers!! Great job.

 

Seriously complaining about the torque curve? Haha. Usually being flat as a pancake all the way out would be incredible, but this is actually gaining torque the whole way up to nearly 9000RPM! Over 225ft/lbs (at the wheels) from pretty much the beginning of the graph. What other engines out there gain 50ft/lbs after 7500rpm. Check out this dyno graph for comparison.



This is from a car I used to own,a greddy turbo AP1 S2000. Torque is still slightly lower than this N/A 20B, but a very similar graph. You can see it still tapering off at close to 9000RPM though. These engines will never be torque monsters like high displacement V8s, but what it is making, and especially holding throughout the entire RPM range is very impressive.

 

The torque is great! It is equivalent to an NA 13B making around 187ft/lbs at the wheels. That is difficult to do.

 

Just conjecture here, but what if you guys put some aluminum, higher compression rotors in that bad boy and spun it to 15,000rpm? Bet you would make over 600whp.

Either way, awesome, awesome work. You guys have my business when I'm ready for a 20b.

 

I am trying to contact some guys who make billet rotors. I dont think higher compression is the answer, but less weight and more rpm is a possiblilty. Only need 11,500 rpm to make 600rwhp

 

Good stuff. Always nice to see people breaking records with our injectors!

 

do want

 

What would it cost you up top to get rid of the big dip down low?

 

:crickets:

 

The dip has ben explained before. The dip is when we actuate the semi-p's with our foot on the gas. We are actuating the semi p-ports mechanically with the gas pedal at certain rpm's (delay in pushing full throttle). We are going to be actuating the semi-p's electronically when we have time to develop the system. We wanted to get all of the intake length testing, along with countless other things before we worried about small details.

Hope the explanation helps.