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Old 07-10-2012, 12:03 PM   #541
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Quote:
Originally Posted by chance91 View Post
Whats that off of? It looks opposite of mine with the TPS and throttle cable flip flopped compared to the rest of the unit. Could be upside down :-) but it looks like the IAC mounts on the bottom as it should just as it sits.

probably B18 etc though?
It's for a Honda "something". Dunno. It's good for some baseline testing. Here are some other shots.
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Old 07-10-2012, 01:03 PM   #542
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It's for a Honda "something". Dunno. It's good for some baseline testing. Here are some other shots.
Where'd you get it from? I *think* its an S2000 throttle body. I do not know if this bolts to B18 etc intake manifolds but I have a feeling it will. So far as I can see it seems to.

*** ok, I don't think its for an S2000. Not sure what its for actually. But how are you going to block off that port on top? I've been trying to find a throttle body with an IAC valve on the Throttle from a honda to use, it would be nice to go to electronic idle control vs a screw. But for now I use the screw and it works alright.

Last edited by chance91; 07-10-2012 at 01:24 PM.
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Old 07-10-2012, 01:22 PM   #543
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Where'd you get it from? I *think* its an S2000 throttle body. I do not know if this bolts to B18 etc intake manifolds but I have a feeling it will. So far as I can see it seems to.
One of my manufacturers makes these for JDM. I saw it at his factory and asked for one to test.

He's working on some new Miata-centric parts for me now, which I hope to show soon...
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Old 07-10-2012, 02:12 PM   #544
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S2000 TBs make a whistling sound... I know that because people use them for that reason...

:/
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Old 07-10-2012, 02:56 PM   #545
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Originally Posted by Braineack View Post
have you seen the dynos of the GT2560 with the BEGi IM and 70mm Mustang TB? gains everywhere, including low-end spool.
I'm skeptical.

Did they do their own testing or this came from a community member?
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Old 07-10-2012, 03:00 PM   #546
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I'm skeptical.

Did they do their own testing or this came from a community member?

Paul did back to back testing. and Saint_foo copied the setup.



This is paul's stock 99 motor with stock TB and IM vs. 70mm TB and BEGI Cast IM





this compares pauls to a 97 block with 99 head and the same components.
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Old 07-10-2012, 03:13 PM   #547
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OOH. I missed the part about Begi IM. I read your post as they installed a 70mm TB on the stock IM and saw gains everywhere.

Reading comp fail.
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Old 07-10-2012, 03:25 PM   #548
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its okay, bro, its okay.
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Old 07-12-2012, 11:23 AM   #549
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its okay, bro, its okay.
You misspelled "brah".
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Old 07-12-2012, 11:24 AM   #550
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so it seems.
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Old 12-18-2012, 06:57 AM   #551
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I just bought DC2 Honda integra Type-R manifold for just 177$ shipped. Now I just need 70mm throttle body and my buddy to weld it to the Miata intake flange
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Old 12-18-2012, 07:58 PM   #552
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Im selling my honda /miata intake if anyone is looking for one. It wont fit in my festiva.
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Old 12-18-2012, 08:23 PM   #553
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Im selling my honda /miata intake if anyone is looking for one. It wont fit in my festiva.
How much?
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Old 12-18-2012, 09:37 PM   #554
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Old 12-20-2012, 04:26 PM   #555
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Originally Posted by aaronc7 View Post
looks pretty cool. mine still hasn't been made. was going to get a custom mazda intake head flange, but looks like a cut 99 stocker works pretty well actually...
It has now!!

I went about it a little diffrent than it is commonly done.

The common way is to cut the flange with a few inches of runners, then cut the flange off the honda intake and weld the runners together.

Well it is common knowlage, the longer runner is good for upper RPM HP and shorter runners is better for low end torque.

The factory Mazda intake has a fairly long runner, and the aftermarket Honda is long also, so why make it even longer?

So to help keep some torque, and shorten the runner a bit, I had a flange made that fits the Mazda.


Then it is as simple as cutting off the Honda flange.


Then welding the new water jet cut Mazda flange onto the Honda intake


The runner spacing is close between the Mazda and the Hinda.


A little porting will be needed to smooth things out.
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Honda intake manifold-img_1350.jpg   Honda intake manifold-img_1589.jpg   Honda intake manifold-img_1588.jpg   Honda intake manifold-img_1586.jpg   Honda intake manifold-img_1587.jpg  

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Old 12-20-2012, 04:39 PM   #556
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Originally Posted by BogusSVO View Post

Well it is common knowlage, the longer runner is good for upper RPM HP and shorter runners is better for low end torque.

The factory Mazda intake has a fairly long runner, and the aftermarket Honda is long also, so why make it even longer?
Actually, from what I remember reading in this thread, it is NOT common knowledge (runner length isn't as simple as short vs long, there are lots of variables that go into it). And the non-scientific general consensus is the opposite. Short runners = less restriction = better flow at high RPM, whereas long runners = more restriction at high RPM, but better low end due to the higher intake velocity.

But again, it's something that nobody (at least publicly) has empirically tested with the BP motor. I'm sure resonances with the valves opening and closing has some effect also, but again without someone really doing any good testing on it, we can only guess.
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Old 12-20-2012, 04:41 PM   #557
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Dudes, runner length tuning, pressure waves, those things are where your runner lengths should be coming from.
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Old 12-20-2012, 04:42 PM   #558
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Ok then how about the runner diameter? How about runner diameter that gets bigger from the port?
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Old 12-20-2012, 04:48 PM   #559
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Runner diameter factors into the wave speed, but normally you just size it to support your horse power requirements. And taper, you want it, but that gets into the realm of the voodoo magic and needing a computer to calculate. The wave math, and the HP math you can reasonably do out by hand, it would suck to have to iterate but you could do it. Beyond that you need computer simulation, or empirical testing. There some guidelines I used to know but can't remember what they were or exactly where they came from.

Before you ask, plenums... make a variable size one between 0.5 and 3 times the engine displacement and test it on the dyno. Go with the smallest one that doesn't loose power and see if that size yields acceptable throttle response.
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Old 12-20-2012, 05:10 PM   #560
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Quote:
Originally Posted by thenuge26 View Post
Actually, from what I remember reading in this thread, it is NOT common knowledge (runner length isn't as simple as short vs long, there are lots of variables that go into it). And the non-scientific general consensus is the opposite. Short runners = less restriction = better flow at high RPM, whereas long runners = more restriction at high RPM, but better low end due to the higher intake velocity.

But again, it's something that nobody (at least publicly) has empirically tested with the BP motor. I'm sure resonances with the valves opening and closing has some effect also, but again without someone really doing any good testing on it, we can only guess.
Oh I will agree there is more to it than long and short.
That is just a general rule of thumb.

I will dissagree that a short runner is for upper rpm, and long for torque...

Unless the intake engeneers for Edelbrock all these years have been wrong....

Look at one of the most common engeins ever... The SBC Small Block Chevy
Yes I know the Mazda BP is a 4 cylinder and the SBC is a V8, both have the same four strojes and the same 5 events.

Look at a tunnel ram intake, super long runners for small blocks twisting 8000rpm

Then look at the Torquer intakes, very short runners....
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