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Old 03-27-2010, 12:04 AM   #341  
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That manifold really sounds like it has been painful. I'm sorry :( Maybe BEGI had it right when they made their intake out of iron :/
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Old 03-30-2010, 02:27 PM   #342  
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I'm with the other guy - bad penetration on the welds or the material is too thin. It's a balloon with sharp corners. Bad design idea. :-) Making it thicker (heavier) would work, or even just adding material at the corners would help. Posts through it could help, too.

FYI, the OEM intake can handle serious backfires. :-) A guy once came down the street 6 houses cause he said my garage scared him and he came to offer medical assistance, the last explosion he'd heard like that was in an iraqi war zone. :-)

Perhaps (though I'd hate to mess with the flow) putting a bolt or two through it would really help hold it together, to keep it from ballooning? Or a clamp/strap on the outside? Seems iffy, really good high res close ups of the weld would help someone who knows welding (and I know a few if you don't) tell you if it's the fault of the weld.
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Old 04-03-2010, 12:40 PM   #343  
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From the looks of the pic, it looks like it could easily be fixed.

Are you planning on building another intake?
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Old 04-03-2010, 02:00 PM   #344  
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I'm fairly certain that it could have been easily welded back up, but it would have just failed again. 17# is what I run on low boost and on high boost it needs to withstand upwards of 32#.

I felt the best course of action is to let the guy that designed it have the first opportunity to come up with a fix for it. So currently the manifold is back at Flipside as of last Monday. Rob took a look at it and listened to my concerns. Not sure what his plan is going to be, but I will post up about it when I get the manifold back.

As much as I like the Flipside manifold, I decided to put a 99 intake manifold on the car this week. I'm in the process of finishing that up this weekend. I wish it was as easy as just bolting it on, but I need to re-work my cold side piping, a bunch of wiring, etc... Having a reliable car that I can actually drive is of utmost importance to me right now. I'll most likely sell the Flipside manifold when I get it back.
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Old 04-03-2010, 05:40 PM   #345  
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Its funny, because I showed my boss that pic and he thought it was caused by backfire as well. I hope flipside figures it out. Shitty you had to go all this length to find out you don't even want it.
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Old 04-03-2010, 06:00 PM   #346  
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I think a backfire would have completely ripped that manifold apart, after all it's only made out of 1/16" aluminum.
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Old 04-03-2010, 06:46 PM   #347  
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Have you considered using the Edelbrock manifold. There are some mega horsepower Miatas running them, I bet they are relatively inexpensive compared to sheet metal. It does not look as good a sheet metal intake, but it should handle any amount of boost you can throw at it.

The tubed Miata that is going low 9's at 150+mph is using that manifold. I have seen it on a few other cars. I think it is worth checking to see what kind of flow and boost they can handle, and if it is still available.

I can't wait to see how the car runs when it is back together.
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Old 04-03-2010, 11:46 PM   #348  
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At this point I'm going to just take it easy for a bit and see what happens. If I don't start driving this car soon, I'm going to end up selling it. With that being said, I finished everything up and the car is ready to drive again. I'll go over it again tomorrow to make sure I didn't miss anything and then it's time for a drive. I hope it doesn't rain.

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Old 04-04-2010, 10:45 PM   #349  
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What a wonderful day. I took it out and beat the ever living **** out of it, all the way to the gas station and then back home the long way. The plan was to go further, but I left the hood at home and it was starting to rain.

Overall it's a bunch quieter now that I'm not running an open dump tube. I also installed an aftermarket exhaust cam. When I get back on the dyno to do some tuning I'll get it dialed in and see if it will give me any extra power.
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Old 04-06-2010, 03:10 PM   #350  
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Don't you mean... Seeing what power hit you took with the OEM mani? :-)

I've seen people take a dremel to them and hollow them out. Might be something to consider, though this edelbrock suggestion is a good one.
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Old 04-06-2010, 03:27 PM   #351  
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If you or anyone wants to buy my mostly polished and hollowed out NB manifold (hollowed top and bottom) it's FS.
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Old 04-06-2010, 03:50 PM   #352  
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DYNO! What difference did you see before/after/compared to an aftermarket unit?
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Old 04-11-2010, 02:52 PM   #353  
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Did a few pulls on the dyno to see what the car is putting down with the 99-00 intake manifold. VICS was locked in the open position and this was at 19# (wastegate).

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Old 04-11-2010, 03:40 PM   #354  
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holy ****

Last edited by 18psi; 04-24-2010 at 05:55 PM.
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Old 04-11-2010, 09:36 PM   #355  
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It also sounds quite a bit different with the dump tube plumbed back in. Ben was nice enough to do a flyby in it today so I got to hear it from outside the car and I think it sounds awesome.
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Old 04-11-2010, 10:11 PM   #356  
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What RPM do you hit 19psi at now? 15psi? 9 psi?
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Old 04-11-2010, 10:19 PM   #357  
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It's fully spooled at 4500. As for the other boost levels, I'm not sure and I don't have a log available. With a mbc or ebc I should be able to get it spooled a few hundred rpm earlier. When I do put a boost controller on it I will shoot for a solid 20.5 and call it a day on pump gas. I haven't done this yet because my injectors are already maxed out up top.
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Old 04-12-2010, 03:46 PM   #358  
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Comparison for those that can't scroll back a couple pages...

Aftermarket mani at 17.5 psi

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99 intake at 19psi

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Old 04-13-2010, 05:54 PM   #359  
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More power coming soon...

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Old 04-13-2010, 05:55 PM   #360  
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Quote:
Originally Posted by JayL View Post
More power coming soon...

I thought you kicked the habit?
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