Here you can see two modifications at once. The first is the modified cylinder head. It now has round ports now versus the stock oval ports. The ports were polished after this picture. The turbo flanges are attached to the head and are port matched ensuring smooth flow through the runners to the turbine housing. The transistion between the head the flanges are so smooth that you can't feel them with our finger nail!!

The engine block is a dummy block that is set up for mounting the turbo and manifold. The manifold will be a full stainless steel four into one equal length unit. Stay tuned... http://www.imagestation.com/picture/sraid19/p38b0aafc284a4cecf3cac13b96e5680c/fdc6f8ca.jpg.thumb.jpgHere's the link to a larger photo (http://www.imagestation.com/picture/sraid19/p38b0aafc284a4cecf3cac13b96e5680c/fdc6f8ca.jpg)

Did you get that cylinder head done locally?

Would you believe me if I told you that I'm doing it myself? I have over 30 hours (an hour here and there) into the head so far. I'm finishing the intake ports tonight and I'll be re-assembling the valve guides, seals, and valves later on this week.
I'll post pix of the start to finish process. It turned out extremely better than I anticipated.

Originally posted by Big Boost
Would you believe me if I told you that I'm doing it myself?
Uh yeah, from what I've seen you're the man... What kind of results are you shooting for with this car? I love all the stuff you've come up with thus far. Keep up the good work!!

Like I tell everyone...
What I wanna do versus what I'm gonna do are two different things.
I want to do 10.99, I might end up only doing low 11's. The stainless manifold in my opinion, will be very trick. I am simply trying to address certain needs that the aftermarket hasn't yet.
What else will I think of, I don't know. Necessity is the mother of invention, so we will see what I need in the future!:cool:

I'm surprised to see that no one asked me how or why I converted the cylinder ports to a circular shape! Maybe a lot of don't realize that the stock shape is oval, and I might be the first to try the circular port trick on a SR20. Has anyone else performed this modification?

hey rob! did u get any 72lb injectors yet??. I also need those traction bars. Pls call me when u get a chance so we can hook something up!. 623-845-1640.

I was going to upgrade to the 96lb units, but something went haywire with a deal. So I will have to keep my brand new 72lb units. I have to take a look at Jackson Diamond's 200SX and see if TB's would work.
Hey, did you get your car running yet?

Let me know if they work or not. Yes I already got the car running, but we are now working all the bugs out of it. We are currently doing a turbo change due to low oil pressure which hurt the turbo. Are u running a t4??. call me or e-mail me your work # so I can talk to u. Thx.

You know we have the same goal don't u???;)

Hmm... circular shape... more area, more flow, and you can use circular tubing for your exhaust manifold instead of trying to find oval ones of the exact size. Therefore, your exhaust manifold will match your ports perfectly which reduces flow loss/restrictions which all adds up to more HP. Looks awesome by the way... wish I had some free time to fab up some stuff for my car. Those traction bars look really cool. kinda curious as to how much they affect the suspesion geometry when the control arm moves up and down with respect to handling on a road course. My guess would be that they would cause a little bit of toe-in but it's probably not that significant and probably makes it more stable anywayz.

Khiem

"Hmm... circular shape... more area, more flow, and you can use circular tubing for your exhaust manifold instead of trying to find oval ones of the exact size. Therefore, your exhaust manifold will match your ports perfectly which reduces flow loss/restrictions which all adds up to more HP."

Exactly! The tubular manifold is perfectly matched to the exhaust ports. I have had SO many arguments with engineers who told me that I would lose velocity due to the round port size. My counterpoint was that it doesn't matter because my engine will be pressurized and any loss in velocity will be overcome by flow. A circular port would kill any bottom end and mid range in a NA engine with stock compression, but again my engine is turbocharged and that's what they fail to realize.

Am I wrong?

Hmm... well, my guess is that the bigger ports will hurt until you start spooling. But once you're making boost, it'll help. That's a pure guess though. I don't have a good understanding of how different flows affect engines.

Khiem

you know the Rotory boys get good gains from hand porting.

I would think that because your turbo you would want to have the largest ports to fill and release the cylinders. I would think that there is a trade off for high power and Streetability. larger ports = more lag.

I see the oval ports as two complete circles that meet together.
so going to a larger circle would be give lots of dead space that you have to fill. Of course this is my un-educated opinion.

Again your goals are High power and I think that this will help you get there.

Again from one do it yourselfer to another, Excellent work man.

You are correct in needing to fill dead space, but when I am shoving 25lbs to 28lbs of boost down the engines throat, I think it should be covered. I'll be honest by saying it's gonna be a little more laggy, but I have a air to water intercooler, the Stage II intake manifold and VERY short IC piping. I may actually offset the lag with those items.
It's only science if you experiment.
Let's just hope I'm right!;)

I belive you it will work well.

My only other consern would be the turbo.

The turbo's Mike K has speced for the SR20 (thanks Mike)
are based on the flow of the Motor. when you disrupt the flow
Would a different Turbo be better than what has been specified as a good turbo for the SR20.

From what I understand the .63 A/R starts to fall off because of back pressure. you've opened a door that will allow it to flow even more and have less reversion. In that case would the .82 be too laggy? This is all speculation and I agree that When your tubo is spooled you will be able to cram a lot of air throught there no doubt. I belive you are using the .82 right?

I was at HRP and watched a T-96 Equiped mustang go down the quarter. This thing was wicked at about half track on. but It just didn't seem fast for the first half.

If you looking for good times you also need to have the power as fast as possible. I guess you just have to see how they offset.
The lag verses peak power. I think you'll be rewarded by it.

Again, Inovation at its finest.

If I had a Dollar for ever Idea I'd be able to afford to go through with the Ideas.

Great work.

bah, just spool it with nitrous or use the JWT drag launch program, it reportedly builds 6-7 psi just sitting there.

When I prepare to launch at the line, I have a MSD Two Step. I will be launching at about 8lbs of boost on slicks. I'll be investing in the Driveshaft Shop Stage 3 axles for sure. My only fear so far is the tranny.

Another thing that will aid spool up is the equal length stainless manifold tuned to the first harmonic. It should go.

i didnt know the MSD 2 step created enough of a load to create 8 psi. pretty cool.

Did you weld in the Port to get that or did you only port in one direction.... Either way it looks GREAT!!!


Good Luck....

Just so you know the Minimonster (400hp 10 sec Miata) snapped one of driveshaftshop.com's axles leaving on a 6000rpm rev limiter. They replaced the axle for free!! That is service..

Danny

Do you mean did I weld in the ports to add material?
If so, I didn't. I just radiused the exhaust ports back to the divider. The flanges are exactly matched to each port.
I think a lot of you would be shocked at the restrictions present in the stock head. The first thing I noticed when disassembling the turbo manifold from the head was that the stock gasket blocked exhaust flow 360 degrees around the ports. I would guess that it probably blocked 10-15% of its capable flow to the manifold!
You guys may think I'm nuts, but I'm cool with that.:cool: