93 R1

????????????



Why? Never heard of that. Please explain

treceb

probably to get a greater air flow at lower rpms.

jspecracer7

well, think about this. when porting the primary ports, your limited to size because of the water jacket right? So...if you bridge the primaries, you'll get more airflow than you would a streetport. Now the secondaries...you can't make them as big as a street port because of the "bridge" that the corner rides on, where as a streetport, you don't have to worry about that as much. So now you have a half bridge(primary) with cut rotor housings flowing tons more air.



Kind of hard to explain, but in person, it's cake. IGY did it on his rotor housings and I was amazed at the power it made(at .8 kilos boost I SWORE to never ride in his car again...and I haven't)

IGY

The primary bridge is a theory, the only real limitation I see is intake manifold/ primary runner size. This is why I want to try this using a cosmo center plate and intake manifold. As far as beveling the rotor housings, I was fairly sure that everyone did this unless they were following certain class rules forbidding porting on the rotor housings. I personally believe that for turbo charged rotaries that a full bridge extends the powerband to high in the rev range, and is of no benefit for the average person. 12,000 rpm's with boost is alot different than 12,000rpm's without.

93 R1

I agree with you. There isn't really a need for 12,000 with 20 psi, but it does sound badass.



So why do most people bridge the secondaries, instead of primaries when doing a half bridge? Just trying to understand the logic between the 2. I had an indepth conversation with Judge Ito about this, since he will be building my half bridge. He never mentioned bridging the primaries instead......





Basically I want what IGY has. A car that will scare the **** out of people, and just put a huge smile on my face everytime I drive it. IGY what kind of power was your car making roughly?

jspecracer7

lol...your going to have a beast of a car if you want to replicate IGY's BP motor. I was destroying cars left and right when IGY was tuning it. At 1.3 kilos, even 20B's were being left in the dust

Badog

Hmmm. You boys get back on topic....NOW!



Based on CFM calculations and VE numbers that are probably not right, I think this turbo is going to have a heck of a top BANG with a fairly decent spool up. I am most concerned with it at 17psi and around 5000rpm. Matched with the right amount of extra CFM from a large street port or a race port (the latter with more overlap between intake and exhaust....my definition for this post anyways) it will be nice. On a mild or stock port, I think you run the risk of being to left of the surge line....not enough UMPH!



Going to be a joy.....soon.

rx7tt95

You're referring to the 88mm wheel correct? Which exhaust housing though...is the .94 going to be too small?

93 R1

lol...your going to have a beast of a car if you want to replicate IGY's BP motor. I was destroying cars left and right when IGY was tuning it. At 1.3 kilos, even 20B's were being left in the dust [/quote]

Badog

Hottie side 1.19AR!