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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 04-25-2008, 01:16 PM   #21
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I've been ignoring this thread due to the title, but when I saw how many responded i had to check it out myself, and yes, I was gonna flame on you...but...hmmmmmm....not so bad!

I would not use that gasket though, it looks like ***, hustlers ***!
I also see an easy way it could get modded to fit an EWG...this looks like a great option for a cheap solution. One thing I forsee as a potential problem would be fitment issues with all the bolt holes lining up.
Worst case scenario, you take it to machine shop and have them bore all the holes over to make it fit, have them also grind down the mating surfaces and maje relief cuts and you are good to go.
If you want EWG, have machine shop cut out a decent sized hole on backside of where the turbo flange is and weld a wastegate flange in place and you are good to go, all still for under $200 I'd say.
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Old 04-25-2008, 02:02 PM   #22
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Given the choice between the one pictured on the TurboXS site and the one on the eBay ad, it's a tough call.

The TurboXS manifold, like the Greddy, appears to place the turbine inlet flange roughly in line with the #3 exhaust port, and perfectly horizontal. This causes the turbo to sit quite high up and rather far back in the engine compartment. It makes designing and fitting downpipes a pain in the *****, and places the downpipe nearly in direct contact with the brake system.

The eBay manifold appears to place the turbo roughly opposite the #2 port, and at an appreciable angle. It looks to me like a cast-iron version of the JGS log manifold. Placing the turbo lower down and further forward will make a lot of things easier from a mechanical fitment standpoint.

On the other hand, the log manifold is, well... It's a log manifold. Meaning that the exhaust pulses coming out of #4 are pointed straight at #1 (rather than at the turbine) and vise versa. The TurboXS / Greddy design would appear to have marginally superior flow characteristics. It's still a long way from a directed pulse design (like the ETD Shorty) But at least it's not literally a straight line from one exhaust port into the other.

I'd probably pick the eBay one. The fact that it places the turbo in a much more desirable location outweighs the tiny flow advantage that I only speculate the other may give.
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Old 04-25-2008, 02:16 PM   #23
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Quote:
Originally Posted by Joe Perez View Post
The TurboXS manifold, like the Greddy, appears to place the turbine inlet flange roughly in line with the #3 exhaust port, and perfectly horizontal. This causes the turbo to sit quite high up and rather far back in the engine compartment. It makes designing and fitting downpipes a pain in the *****, and places the downpipe nearly in direct contact with the brake system.
Makes one think why Greddy did this in the first place. I would imagine that their first priority during turbo placement was to make it fit the stock intake parts via that badly designed "?" pipe. And also to negate any chances of oil not returning to the high-placed location on the other side of the block.
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Old 04-25-2008, 02:22 PM   #24
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Originally Posted by The_Pipefather View Post
Makes one think why Greddy did this in the first place. I would imagine that their first priority during turbo placement was to make it fit the stock intake parts via that badly designed "?" pipe. And also to negate any chances of oil not returning to the high-placed location on the other side of the block.
This is true. Any further forward and it would have been a "&" pipe. And remember, of course, that the Greddy kit was designed for RHD cars- thus the proximity of the downpipe to the brake system was a non-issue.

As far as the oil drain, I still can't fathom that anyone actually uses that thing. I just can't see how you'd run that piece of fat-*** hose all the way around the engine block (essentially 270° of bend) without kinking it, without it rubbing against something like the pulleys or belts and cutting in half, etc. It's just such a horrible, awful design.
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Old 04-25-2008, 02:37 PM   #25
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When I went to that autocross a guy had just bought a 91 with a greddy. Didn't tell me how much he paid for the car but he said the guy showed him invoices for over $4500 for the basic greddy kit with vortec and no IC setup with a single FM boost gauge. He was using the greddy drain routed around the front, it had an immediate uphill over the PS lines. I laughed and told him he better fix that quick.
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Old 04-25-2008, 04:44 PM   #26
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Quote:
Originally Posted by The_Pipefather View Post
Makes one think why Greddy did this in the first place. I would imagine that their first priority during turbo placement was to make it fit the stock intake parts via that badly designed "?" pipe.
The ? pipe was probably some of it, but mostly it was designing the kit on a RHD car, I'd imagine.
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Old 04-25-2008, 04:49 PM   #27
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If they allow a discounted group buy and pick up I can ship them from work for probably like 10 dollars a manifold (big bussiness fedex discount). Plus the vendor is in my neighboring city so it probably would only take me like 10 minutes to go and pick them up.
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Old 04-25-2008, 06:31 PM   #28
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they are dumb *****, thats for sure. i got a response to my question about if they offer any to accept an external wastegate and this is what i got in return

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what do you mean?


- ilovetacotaco
geeze
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Old 04-25-2008, 06:39 PM   #29
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Try asking "¿Usted vende un múltiple para el Mazda MX5 que acepte una compuerta de descarga externa?" instead.

My gut feeling is that they probably don't. Abe and I were having a conversation along these lines a few days ago, and one theory that was presented would be to drill and tap a hole in the bottom to accept an NPT-threaded black iron pipe. I have no idea whether or not that would actually work, but it's definitely in the DIY spirit and for $160 it's not an expensive test.
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Old 04-25-2008, 07:26 PM   #30
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Here we have someone who is finally selling an (apparently) decent manifold for the Miata for less than $200, and we are debating on whether it will take an external wastegate. Why in the hell would anyone buying this manifold want one? Its not like anything south of 250 hp demands one anyway.
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Old 04-25-2008, 07:52 PM   #31
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everyone knows you can mod it to accept a external gate. it would just be nice to have it some with one.
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Old 04-27-2008, 07:23 AM   #32
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Originally Posted by SolarYellow510 View Post
Also, a T3 or bigger on a 1.6 would suxx. I found a version of the Disco Potato that has internal wastegate and T3 flange. So that would work. Or you'd need to figure out an adapter flange to go from T3 to T25.

Um, alright. I came home and looked at this thread to see if there was anything new.

Hey solar. DO SOME ******* RESEARCH. there are plenty of people using t3s on 1.6 miatas. I'm about to be one of them. Its not that you offended me or anything, but really, when I came to this site, I did not know ****. I kept my mouth shut about these things that i did not know **** about, until I at least had some idea of what I was talking about
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Old 04-27-2008, 11:25 AM   #33
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Not they I need one but - $29.95 shipping to US - $139.95 shipping to Canada? WTF

edit Nevermind - Seller's payment instructions says $79.95 to Canada.
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Old 04-27-2008, 12:02 PM   #34
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Its not that you offended me or anything, but really, when I came to this site, I did not know ****. I kept my mouth shut about these things that i did not know **** about, until I at least had some idea of what I was talking about
You must be right. I no longer know anything about cars or turbos, because I just created a new account on miataturbo.net. Time to start over. Dang, that's a lot of years reading, hanging out with engineers at Garrett, driving and dynoing many, many modified cars and building some of my own, all lost by registering here. Oh, well. At least on the good side, I should be able to learn everything I need to know shortly, all from this forum.

84-87 300ZX had a T3 on a 3.0L. 88-89 had a T25 and higher compression. The only reason to do that would be to combat lag. Z32s had a pair of turbos with T2 compressors and T25 exhaust turbines for a 3.0L. That car made 300 hp, so putting one of its turbos on a 1.6 Miata should work out pretty nice. I guess if a really laggy setup that only makes ~150 hp is okay, then you're right, use the 25-year-old technology T3. But against cars I measure by, that suxx.

Last edited by SolarYellow510; 04-27-2008 at 12:47 PM.
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Old 04-27-2008, 12:18 PM   #35
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Originally Posted by wes65 View Post
So, after driving my car at 8psi, a friend of mine wants to bring his 1.6 to 150hp. He is looking to do this as cheaply as possible. Bandaids ftw. He can get a t3 from a 300zx for cheap and he wants to go with that. What do you guys think of this manifold? I dont really see how you could go wrong but who knows?

http://cgi.ebay.com/ebaymotors/89-93...spagenameZWDVW

Stock 300zx turbos are T25s.
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Old 04-27-2008, 10:01 PM   #36
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Stock 300zx turbos are T25s.
http://en.wikipedia.org/wiki/Nissan_300ZX

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The 1984 to 1987 turbo models featured a Garrett T3 turbocharger with a 7.8:1 compression ratio
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Old 04-28-2008, 12:19 AM   #37
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"NOTE: All of turbo parts and accessories do need to modification in order to fits perfectly."

Ugh...when will foreign e-bay sellers learn to use someone who speaks proper English to translate their descriptions for them. Every time I read something like that I want to punch myself in the face. I could make soo much fcking money editing ebay posts for sellers so that they actually say what they intend...
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Old 04-28-2008, 06:11 AM   #38
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Quote:
Originally Posted by SolarYellow510 View Post
You must be right. I no longer know anything about cars or turbos, because I just created a new account on miataturbo.net. Time to start over. Dang, that's a lot of years reading, hanging out with engineers at Garrett, driving and dynoing many, many modified cars and building some of my own, all lost by registering here. Oh, well. At least on the good side, I should be able to learn everything I need to know shortly, all from this forum.

84-87 300ZX had a T3 on a 3.0L. 88-89 had a T25 and higher compression. The only reason to do that would be to combat lag. Z32s had a pair of turbos with T2 compressors and T25 exhaust turbines for a 3.0L. That car made 300 hp, so putting one of its turbos on a 1.6 Miata should work out pretty nice. I guess if a really laggy setup that only makes ~150 hp is okay, then you're right, use the 25-year-old technology T3. But against cars I measure by, that suxx.

Well ****. You are obviosly the guru of turbo technology. Talk to anyone on this forum that is using a T3. It does not seem like any of them have a, "really laggy setup that only makes ~150 hp" While they might have more lag than a t25, they are probably making more hp with less psi(with a bit of reading, here, or in many other places, that FACT is easy to find)There are many different kinds of T3s out there, and some of them are ideal for a tubo miata.

Also, 300zx?, wtf do I care about your 300zx's? I dont know anything about which particular t3 is on there, and i could give a **** about the twin t25s, or t2s or whatever the hell they are.

Edit:

I guess If im going to stay within the bounds of this thread, yeah, a t3 at 150hp would suck compared to a t25 at 150hp. But if you are going to say that a t3 is just a bad turbo for miatas in general, you need to update some of that expanse of knowledge that you have been working on over the years, with all those guys at garrett, and all those builds you have been involved with.
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Old 04-28-2008, 02:11 PM   #39
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the whole idea with the t3 is that it is cheap.
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