20B N/A build thread -- 3rd rotors a charm

[charlies7]

Sup guys..

Car has been down for almost 2 years..Alot of it was because I took it apart before I went to school, then getting lazy, and on top of that I like to buy and sell crap.

Anyways..

Recently picked up a 20b shortblock. It is a early number series with less than 30,000KM. When I got the engine is was dirty but the inside looked really clean. Compression also seemed like it was there so that is a plus.



I am doing this build cause I love the simple look of the NA 20b and the SOUND!!!!!

The engine was sent out to Glen Weaver over at Arizona Rotary Rockets for a complete build. Glen does some great port work and has shown that he is one of the top engine builders in the country. Check out his site at www.azrotaryrockets.com

The engine is getting the following done:
LARGE streetport with some more special touches. Going to be extremely aggressive
Dynamic balancing to 9500 RPM's
Re-ground irons
All the rotor housings and irons are shot blasted and throughly cleaned from previous use
All new OEM seals
S5 NA rotors -- 9.7 compression ratios
New bearings
Pretty much the engine is going to be like new when I get it back.

For mounting I will be retaining the stock subframe and the engine will be about a inch higher than the stock 13b. I dont know what the new drive line angle will be but I will figure it out if anyone cares. It has been done before by several shops so I am not concerned about the change.

I will be ditching the AC, Power steering, and ABS to clean everything up. Hopefully I plan on relocating all fuse boxes in the engine bay, and removing the stock fan relays because I can run everything off of the ECU.

Exhaust

I will be making my own equal length exhaust manifold. 2 inch primaries into a burns stainless SS merge collector. The outlet will be 3.5 inches and will carry out to the back of the car. I plan on only running only one Magnaflow race muffler, but I will make the exhaust so I can put another muffler section in if it is too loud. I dont think I loud 20b will sound bad though

Intake

This is the tricky part of the entire build -- Plan is to fully machine barrel type ITB's. I have the solid model done and I will upload a .jpg image later tonight. Design was done by my cousin, but it might be changed up to my liking. They will work with a GM D-shaft TPS and roll on ball bearings. Everything will be sealed with orings to ensure no leaks. Each throttle body is 60mm to feed the LARGE intake ports.

Concept desgin



Fuel

Fuel will be done by CJ motorsports, Brandon (oorx7) will be making my fuel rails and setting up my lines etc. This wont be his typical fuel setup because I will be using a ITB setup so the secondary rail will be different. I will be using a turbosmart fuel pressure regulator, only cause I have one lying around . 6 Evo 8/9 injectors will be used. I believe they are 560cc and are low impedence.

Cooling

Probably one of the most important parts behind a rotary is the cooling system..Well I plan on making this simple and I plan on doing that with a electric water pump. Recently picked up a Meizere 55 GPM pump and a Meizere block adapter. I plan on ditching my old fluidyne radiator and getting something a little thicker. Something with more volume and better flow.

Anyone have any ideas?

Oil coolers will just be stock R1 dual oil coolers.

Engine management

Tec3r is the choice for this. Found it to be a great EMS and with much reading on other fourms seems to be user friendly. It will be able to control my EWP and fan, has many aux inputs and has great ignition technology. I will also be using there 60 tooth trigger wheel and ignition system.

Tuning!!!

Tuning will be done by a local rotorhead that is highly qualifed in my book. Has been tuning my car for years and always with great success.

Plan is to hit 400whp with the ITB setup.

Ill add whenever I get some more info..Hopefully it will be all good information because the next info I get will be Glen with the condition of my engine.

Please feel free to chime in and give some ideas.

[dregg100]

ballin!!

[Christopher W.]

Hey, our builds seem to have a lot of similarities. We were going to go with some custom barrel type ITBs but Logan couldn't get them the way he wanted. You know, you have to chose your battles. I think there was a problem getting them to seal up properly. I bet someday he will get them built the way he wants. Just not by the time my ride is done. Anyway, we have decided to go with ITBs off the shelf. He hasn't made a final recommendation yet on make and model of ITBs.

I am using the TEC3R as well.

It looks like an awesome build plan.

Good luck and keep us posted....

Christopher

[charlies7]

I like Jenvey for throttle bodies, look into those.

Charlie

[Herblenny]

So, you guys like Tec3Rs? Any advantages over new Haltec or any other ECUs??

[Christopher W.]

Originally Posted by Herblenny

So, you guys like Tec3Rs? Any advantages over new Haltec or any other ECUs??

Sorry, I don't have any particulars on the reason to use the Tec3R. Main reason because that is the ECU my tuner is most comfortable with. Plus I got a great deal on a new one. I saved about $900.00 buying mine off of a member on the other forum. Maybe Logan can chime in with his reasons...

[Christopher W.]

Originally Posted by charlies7

I like Jenvey for throttle bodies, look into those.

Charlie

They look very nice with a great variety... Ugh, pounds to dollar rate is still pretty ugly. There are two distributors in US. Probably won't do much for the exchange rate but it is more convenient.

I will see if Logan is familiar with these.

[charlies7]

Got a call from Glen today and the rotor housings are useable but not ideal for what im looking for. The housings have significant edge wear and were badly corroded sicne the engine was sitting so long.

The rotors are out getting machined and I should have some pictures of the parts next week.

If anyone knows of any good LOW mileage rotor housings let me know. Doesnt need to be REW.

[War Eagle]

Originally Posted by Herblenny

So, you guys like Tec3Rs? Any advantages over new Haltec or any other ECUs??

Not a lot of support for the Tec3 in the US. There are a bunch of good options now with good support. Haltech or Microtech would have the most support available and they both work great on the 20B. How do I know this? They've both been on my car and worked well. The Wolf 3D was probably the easiest to tune for a novice like me but there is not a lot of support for it here.

Charlies7 is correct though - go with what your tuner wants. It's the best way to ensure you get a good tune and are not responsible for problems if they arise. The tuner can't blame it on the ECU. Don't ask me who I learned this lesson

As for rotor housings, call Cam Worth at Pettit Racing - he always has a stock of rotor housings hanging around so you might get lucky. You can get new ones through Ray Crowe at Malloy Mazda but they cost a bundle.

[Herblenny]

Thanks David! I'm in a limbo as when I talked to Ray Wilson, he said he could tune pretty much anything..

I talked to Logan and he prefers Tec3..

I had the E11v2 but sold it when someone told me Haltec was working on a new ECU.. Haltec was my choice then but now I'm debating again...

[charlies7]

Thanks David for the info on pettit. I am still looking for some MINT low mileage housings by next week so I can get them over to AZ rotary rockets. I did talk to my tuner again and he likes the haltech to, and its cheaper..

Im starting to think about my choice, I need to choose soon though because I want this car running a couple months from now.

[Herblenny]

WOW!! You want this to be moving in 2 months?? Dang.. I'm not even close right now

[charlies7]

Originally Posted by Herblenny

WOW!! You want this to be moving in 2 months?? Dang.. I'm not even close right now

Not anymore

Update to come, and its not so good.

[dregg100]

if you guys decide to go haltech, let me know, we are running a sale on them right now, and the new platinums are insane.

whats the bad news charlie?

[classicauto]

Originally Posted by War Eagle

Not a lot of support for the Tec3 in the US.

You mean not alot of tuners for it yes?

Because unlike just about everything else, that box is made stateside and also serviced there.

I *really* like my TECgt