Extrude honed 20B stock IM's are proven to make 900hp anybody saying they don't work hasn't run one. Not shooting you down, Just know the people doing it.

 

I never said you can't make hp from extrude and honing. What I stated is it depends on who does it, and that people have had various results. So now where did I say it wouldn't make 900hp, or that it wont make power?! You can literally make power with anything. Now just because you can make 900hp with an extrude and honed 20B IM, doesn't mean you can't make more hp, with everything else unchanged, with a better designed IM. If that was the case, aftermarket intake manifolds wouldn't exist. Also, with a factory IM, there's no way to tune the runners for the RPM range you want. Your stuck with the factory tuned length/design. With a custom setup, you get to call the shots, and have it setup for your needs, not the factory needs.

Besides all that, what does a 20B intake manifold have to do with the 13B that Ernie is running?!

-Alex

 

Ha! would you feel better if I said 700hp on 2Rotor I'm well aware of the all that you said I designed my own mani years ago. The only point I was making was good power can be had from the stock IM so many wanna go the custom route now. When for 99.9% there really is no need.

 

Oh, I just wasn't sure if you got Ernie confused with someone that had a 3 rotor. Anywho...What someone needs is all in the eye of the beholder. If your looking for every bit of hp you can squeeze out of your car, than go with a custom intake manifold. Not only will a properly designed intake manifold yeild more power, you help decide where max power will be made. Besides, there's also the "bling" factor!! If your on a budget, or arnt looking to squeeze every bit of hp out of the motor, i'd still ditch the factory LIM, and go for the Xcessive LIM. This will atleast equal out the runner lengths, and take that huge kink out of the equation. From there, you can extrude and hone the Xcessive LIM, and the factory UIM.

Also keep in mind extrude and honing is going to effect how the car will run around town. When you extrude and hone, your enlarging the runners, which will decrease the velocity. Or, in other words, you shift the power towards the low end. However, a turbocharger can usually overcome this, and still create power up top, without dropping off. This, however, all depends on the turbocharger. If your thinking, great, I need more low end since I have a laggy turbo, think again! It's not quite that simple. Depending on where your intake manifold is tuned to make max power, will depend on how your turbo spools.

There's a guy on this board with a GT42 that extrude and honed his factory intake manifold, then tried the Xcessive LIM, and it outflowed his extrude and honed factory LIM right out of the box. So, in most cases, the Xcessive LIM will yeild more power over an extrude and honed LIM. Of course, if you still want more power, the next step is a custom IM.

-Alex

Edit:

 

w/ all the money someone can spend on extrude honing, getting an xcessive lim, upgraded tb, etc., he might as well do it right the first time and go w/ a properly build sheetmetal im w/ a the proper plenum volume and correct runner length, diameter and taper. not only will a good im make more power, it'll also make tuning easier and add a little extra insurance for the motor because fuel trim can be evened out much better than the stock im. not saying that a stock im wouldn't be sufficient, but this seems like a serious project so ernie might as well go w/ the best quality im he can get.

 

You know
that the fastest 13B in the world
uses a stock 3rd gen manifold and a upgraded/modified stock TB
and uses C16

"Sporty Dynojet"/Motorsports

 

And the fastest 3 rotor uses a custom intake manifold. So what's your point? Can both get the job done? Yes. ZeroR already pointed that out. Either way, a setup with the Xcessive LIM, or a complete custom intake manifold (properly designed) will yeild more power over the stock intake manifold. Period. (Of course, this is if the rest of the car is left the same, and only the intake manifold was changed)

On another note, just because you have the fastest 13B in the world, doesn't mean it's making the most power. I'd be more interested in what the highest hp 13B uses. You could give me a 1,000 hp car, but I probably wouldn't be able to run 10's, when it should be running 8's!

-Alex

Edit: I want to apologize to Ernie. I've totally hijacked your thread. I just wanted to make you aware of why our cars don't have a plenum, and be careful choosing a TB. I'm sure Ross has alot of experience, but i'd be more interested in finding out how much experience with rotary engines. Our intake manifolds are setup diffrent than a piston engines intake manifold.

 

Well for some reason my edit didn't show up on my last post...

I want to apologize to Ernie. I've totally hijacked your thread. I just wanted to make you aware of why our cars don't have a plenum, and be careful choosing a TB. I'm sure Ross Machining has alot of experience, but i'd be more interested in finding out how much experience they have with rotary engines. Rotary intake manifolds are setup diffrent than a piston engines intake manifold.

-Alex

 

That 's what I was trying to say