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Old 09-18-2008, 11:48 AM   #1
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Default GReddy manifold cracking issues?

Hey Guys,

We are wanting to get your inputs on the history of the GReddy manifolds on the Miatas, regarding cracking. How many of you have seen or heard of them cracking? We are considering making replacement manifolds for these, and are wondering if there is a big enough market for them.

And before you say it, yes we know that another company is making them. Yes we are dealers for some of that companies products. And no, we will not be making a copy of that company's product. We instead hope to make a replacement manifold that will have improved flow and features over anything currently available, yet still bolt right in to a GReddy setup.

We are hoping that the improved flow version will post higher numbers than the oem cast manifold, enough so to capture the interest of those who would make the purchase just to get the power bump.

Craig
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Old 09-18-2008, 11:54 AM   #2
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i think it is the bankrupt kind of crack they are having problems with craig.
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Old 09-18-2008, 12:03 PM   #3
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Yea, my .02, not that it really matters, I would probably focus on other products that will continue to have a demand. Yes there are a **** ton and a half of greddy kits out there but I'd guess 1/2 of them are owned by m.net type people who will never have the desire to upgrade, and the rest of them are becoming interested in upgrading to something along the lines of the begi s-kits.

You will probably sell at least a good few right off but I don't see much of a market for them say a year or two from now.
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Old 09-18-2008, 12:30 PM   #4
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Ive been running my Greddy kit for almost 3 years now, waiting for something to change. The cast ones really are stout, and the turbo is trustworthy. If my manifold does crack. ill be upgrading all three pieces. Turbo, Manifold, and downpipe...

WHAT DOES SUCK ABOUT GREDDY, puny downpipe. no intercooler as they come out of the box. Im sure there are cars running without either upgrade.

If you wanted to produce something for the greddy crowd: I feel a bolt in 2.5 downpipe. or a bolt in , simple intercooler setup. Simply an upgrade what works. There are other manifolds out there that would replace and work, but many more i feel would aspire for upgrades.


just adding my 2c...
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Old 09-18-2008, 12:39 PM   #5
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My manifold cracked, even with the slits cut and warped so bad that I had to remove some studs to get it out. All the turbo to manifold bolts snapped in the manifold rendering it unusable.
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Old 09-18-2008, 12:49 PM   #6
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Mine cracked in two spots. In between runners 2 & 3 right under the turbo. I had it brazed up and that was it. No more trouble after that. Not to long after that I smoked my turbo and made a T3 tubular manifold. I've been running that since. I sure do miss the way that 15G spooled.
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Old 09-18-2008, 04:25 PM   #7
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The original manifold had cracking issues, and they fixed it with a new manifold. No longer an issue.

I would recommend trying to do an upgrade like mentioned above. A better DP would be great. The Racing Mazda one isn't sold anymore, and Begi finally fixed theirs, but it's pricey. Getting ahold of TurboTony (built the RM ones, but then quit, so makes them on the side) is difficult, and they aren't really that good a quality. So make a 2.5", or bigger, DP and make it about $350 and you'll have a good market.
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Old 09-18-2008, 05:32 PM   #8
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My two biggest complaints with the Greddy manifold is that it is top mount and that the turbo is too far back. What I would like is a manifold shaped more like the Begi one which uses the Greddy kits turbo and mounts it further forward. Would need to build a downpipe for that placement too.

Oh how I would love to have that.
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Old 09-18-2008, 05:58 PM   #9
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No cracks on my manifold. However, if it did crack- i would for sure want to upgrade. Manifolds sound good to me.
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Old 09-18-2008, 09:00 PM   #10
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My first one cracked on the bottom in between the #1 and #2.

This one hasn't cracked after 2-3 years and a RMDP with flex joint.

Chris
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Old 09-18-2008, 09:17 PM   #11
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Quote:
Originally Posted by miataspeed1point6 View Post
My two biggest complaints with the Greddy manifold is that it is top mount and that the turbo is too far back. What I would like is a manifold shaped more like the Begi one which uses the Greddy kits turbo and mounts it further forward. Would need to build a downpipe for that placement too.

Oh how I would love to have that.
I bet some Greddy types would stick with the Greddy turbo itself if that came out. Something with a better downpipe placement and optimized manifold (something like the ETD "shorty" manifold comes to mind).
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Old 09-18-2008, 10:10 PM   #12
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I ran a 1 off equal length tubular manifold on my old Greddy kit. I made a couple of extra horsepower versus my cracked cast manifold but nothing worth the effort and cost of making it.

It did however run it with a stock Greddy Downpipe which may have been a bottleneck.
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Old 09-18-2008, 10:34 PM   #13
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Quote:
Originally Posted by [email protected] View Post
It did however run it with a stock Greddy Downpipe which may have been a bottleneck.
MAY have been a bottle neck? I think it's pretty well documented how much of a restriction the stock greddy downpipe is. You can only assume that it would be an even bigger obstruction once you replace the manifold with a nice free flowing unit.
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Old 09-18-2008, 10:43 PM   #14
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Quote:
Originally Posted by miataspeed1point6 View Post
My two biggest complaints with the Greddy manifold is that it is top mount and that the turbo is too far back. What I would like is a manifold shaped more like the Begi one which uses the Greddy kits turbo and mounts it further forward. Would need to build a downpipe for that placement too.
While I agree that the turbo is too high and too far back, I can't see myslf spending money on a new manifold and a new downpipe only to keep the same old non-watercooled turbo. I mean, the TD04H-15G isn't a bad little unit, but if I were spending the money and time on a new manifold and DP, they're going to wind up with a GT2860 in between them.

I just can't see this one being a huge seller, especially given the existence of the Bell-S and Greddy's recent troubles.
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Old 09-18-2008, 11:04 PM   #15
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about 15K on mine with relief cuts, no cracks. i think a better option would to engineer or find a turbine housing that would make the greddy turbo useful with other t2 based manifolds and downpipes that are already available(keep the t2 inlet and change to a 5bolt outlet)
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Old 09-19-2008, 12:36 AM   #16
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Sounds like a less restrictive downpipe for the GReddy may be more important than a better flowing manifold. Thoughts?
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Old 09-19-2008, 12:52 AM   #17
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Indeed. Upon a re-read, it occurs to me that my last post could be interpreted to mean that I believe the Greddy DP is fine. Quite to the contrary, I replaced mine almost immediately with a 2.5" Tony pipe. This, however, was a relatively inexpensive upgrade.

What I meant to say was that if I'd intended to replace both the DP and the manifold, I wouldn't have bought the darn kit in the first place. The manifold isn't perfect, but it's adequate. Mine's been on for about 2.5 years, and no signs of cracking. (Yes, I made relief cuts between each port in the head flange prior to installing.) The DP, by comparison, was just utter garbage.
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Old 09-19-2008, 01:45 AM   #18
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Quote:
Originally Posted by Joe Perez View Post
I just can't see this one being a huge seller
I figure most Greddy kits are used. If someone has a cracked manifold with the stock dp, it would be nice to buy a replacement manifold and dp at the same time and fix the horrible fitment. People who have a TT or RM dp and a cracked manifold could sell the dp, I'm sure there is still a market for them.

Then again I really want the Greddy kit exterminated from the earth. I swear the next time I have to pull my manifold/turbo and downpipe just to do an LC-1 recalibrate I'm going to just throw it away. I bought it for $500 so I guess I can't complain too much. I just HATE the positioning of everything.
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Old 09-19-2008, 02:45 AM   #19
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Keep in mind BEGi just released a DP (finally) so if you do make a downpipe it's gotta be able to compete price and performance wise with them too.
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Old 09-20-2008, 08:32 PM   #20
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Mine just cracked and I would love a new manifold. I actually came on here to find out what my options were and to get new bolts since they all snapped off in the mani. 12psi is enough for me and I'd much rather have faster spooling. If there's any other mani/DP combination that works better, I'd love to hear it.
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