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Old 11-26-2009, 02:30 PM   #261
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The stock manifold isn't complete junk, 500+ is possible with it and has been done. There's just room for improvement by going with something more efficient. Same as comparing a guy who pieced his hot and cold side piping together using sharp bends, 20 couplers with a junk ebay intercooler to someone who's spent the time to do it right. Just the little things like all smooth transitions, piping size, minimum couplers, no sharp bends, proper intercooler, etc... all are pieces of the puzzle that will aid in the efficiency. Part of the intake solution for me is also a much larger throttle body and larger cold side piping.

I really don't think there's going to be any perfect solution for everyone when it comes to these intake manifolds. There's just too many variables and everyone has different goals. Just like choosing a turbo.

As for spool data, here's what it was a while back. So far I'm very happy with this turbo and wouldn't want anything smaller.

RPM Boost(psi)

2500 1 PSI
2750 2 PSI
3000 3 PSI
3250 4 PSI
3500 5 PSI
3750 8 PSI
4000 13 PSI
4250 18 PSI
4500 23 PSI
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Old 11-26-2009, 02:43 PM   #262
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Quote:
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4500 23 PSI
Dayum! I need to see some more videos of this car in action!
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Old 12-21-2009, 11:51 PM   #263
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Starting to pull things apart to simplify the car and remove some weight. On my last Miata it seemed like it has less emissions junk. Since this is a bit different, I thought I would ask so I can do it right the first time.

In the picture, everything circled will be deleted, too simple (or am I wrong?). What will be left besides the wire connections is a hard line from the factory catch tank. Can I remove the entire hard line that runs back underneath the car? I'm thinking it goes back to the charcoal canister and that will also be deleted. I have been told that the gas tank vents somewhere into this system and that's one thing that I need to keep. Where is this and if it's not back at the charcoal canister location, then where does it vent?
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Old 12-22-2009, 01:13 AM   #264
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Last week I removed those cadmium plate brackets, painted them black and put them back on. Mine were oxidized. I'm replacing all the tubing.

IIRC there is a thin line coming from the fuel tank which goes to the rail, and a fat line which I think is the vent from the fuel tank to the charcoal canister. As far as I understand it, the charcoal canister feeds into the intake manifold or throttle body (I dunno) via electronically controlled valves that open/close under various driving conditions. You can VTA the gas tank via that line anywhere. Or redirect it. IIRC there's three lines coming out of your tank. One goes to the rail, one goes to the canister and I have no clue where the third goes. Nyways mebbe you could remove the factory quick disconnect for the canister and hook up a new line to that and route it out under the car or something. I am pretty sure you could also route it directly to the intake manifold. Maybe that's bad though.

Don't take my advice before someone more knowledgable/experienced than me confirms this though ^^^^

If I have my way, in the future I'd like to move the canister somewhere else and remove all that crap from the bay. --- perhaps relocate it to that space between the fuel tank and the frame.
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Old 12-22-2009, 01:14 AM   #265
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Also what are those hoses for in the bottom right? WI?
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Old 12-22-2009, 01:19 AM   #266
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Also what are those hoses for in the bottom right? WI?
They sure are, but they will be moved to a hidden location in the future.
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Old 12-22-2009, 01:34 AM   #267
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Do you know what all that crap is for in the upper left circle? Those lines just go to the intake manifold :|
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Old 12-22-2009, 01:46 AM   #268
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It's all part of the EVAP system. The top two circles contain: EGR boost sensor, EGR boost sensor solenoid valve, Purge Solenoid Valve and the VTCS vacuum switch.

I will also be deleting the VTCS solenoid valve, delay valve, vtcs check valve, and the vtcs shutter valve actuator when the manifold is swapped out.

Last edited by JayL; 12-22-2009 at 01:56 AM. Reason: Added more information
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Old 12-22-2009, 01:59 PM   #269
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Did a little more poking around and here's what I have found. All the items circled in the above picture are going to be deleted. Under the catch tank there's a line that runs back to the charcoal canister and here's where the fun starts.

On the charcoal canister there is a line that comes from the fuel tank. If I eliminate the charcoal canister, what do I do with this line? There's another line going from the charcoal canister that goes to the CDCV, then to an air filter and finally the evaporative chamber. If the canister's gone, then these can all go as well.

Since it's a closed system, I might be better off leaving the charcoal canister in place and just capping the line that runs up to the catch tank. Will this cause any problems? If not then this is as far as I will take it.
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Old 12-22-2009, 03:58 PM   #270
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That stuff looks like the same stuff that was in my '93. I didn't do anything with that extra line and it ended up puking some stuff (fuel?) at the track. One of the charcoal canister lines vta'ered to the subframe, I'll probably end up connecting those two, so if it does puke it won't get all over my altenator and under tray.
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Old 12-22-2009, 05:39 PM   #271
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Here's a page from the factory service manual. Which ones are you thinking of connecting?
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Old 12-22-2009, 06:40 PM   #272
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After a little more research I think this is what I will try unless someone can educate me on why it won't work. My previous post has a picture of how it is stock, this is what I'm thinking might work. The fuel tank will still be able to vent and I can remove all the other items that aren't going to be used.
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Old 12-23-2009, 02:05 AM   #273
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Here's what inspired the removal of that stuff.

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Old 12-23-2009, 02:48 AM   #274
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MOAR PICS
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Old 12-23-2009, 12:16 PM   #275
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Quote:
Originally Posted by JayL View Post
After a little more research I think this is what I will try unless someone can educate me on why it won't work. My previous post has a picture of how it is stock, this is what I'm thinking might work. The fuel tank will still be able to vent and I can remove all the other items that aren't going to be used.
That looks reasonable to me.
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Old 12-23-2009, 03:32 PM   #276
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Maybe the "to dynamic chamber" (that's what she said). I'm not sure, your system does look a little different, especially by the gas tank. I just know there's a hose barb on the sub frame that I'll be using, as I said, it vents to atmosphere.
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Old 12-23-2009, 04:09 PM   #277
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JayL,

How's that custom mani feeling? You hit the track with it yet? Dyno? Butt dyno?
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Old 12-23-2009, 04:21 PM   #278
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Nothing yet, really sucks having to dependent on others to do welding projects for me. I need to have a bracket for the throttle cable welded on and the vacuum ports redone. Then I can drive it down to the shop to have the cold side intercooler piping redone.
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Old 12-23-2009, 09:43 PM   #279
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Ah, yeah - wanting to ease SOME of my moral suffering, I just put a check valve between canister and manifold to keep from inflating the gas tank, and otherwise let it be. All the valves disappeared, and it's been working well. But you're right, that's just a vent line without the canister, and I guess I might run it under the gas cap flip lid were I to delete the canister - not sure why this speaks to me, I guess if it overflows it'll end up in the tank overflow drain tube that's there anyways
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Old 12-24-2009, 01:10 AM   #280
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That's not a bad idea about running the vent line to under the gas cap flip lid, thanks.
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