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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 09-27-2008, 10:13 PM   #21
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Quote:
Originally Posted by 18psi View Post
the spool - you say full boost by 2600rpm right?
Right, on a 1.6 that flows FAR WORSE than a BP4W head that you have, and that too, with a crappy 2.25" dp/exhaust that is meant for an N/A engine.

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power - you posted before that your car feels significantly faster than a t25 car you got a ride in (or did i get that wrong?)
Not T25, a Greddy TD04-15G. Since I said that some things have changed. The Greddy car is now at 10 psi just like mine, and it feels lifeless till about 3500 to 4000 after which it just flies. Mine spools a full 1000 rpm lower, even though the Greddy car has a full 2.5" tony dp and exhaust. I feel my exhaust and small intercooler are holding me back in the top end, plus my engine has twice the miles and close to dying. This is why I suggested a very free flowing exhaust, so that it can breath up top.

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the topend - you say the td04 DOES NOT taper up top and holds boost all the way to redline
No it does not. Holds 10 psi all the way to redline after extensive fiddling with the EBC maps.


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Originally Posted by 18psi View Post
also, you say it was a little bit of a pita to get the turbo to work since after clocking it you have to get a new wg actuator bracket. care to shed some more light on this?
No I used the same bracket but only on one bolt. Depending on your manifold you could easily make a bracket to hold the actuator independent of the turbo. Like mount it to the head or something.


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one of the reasons im even considering a garrett style turbo right now is because I REALLY dont want to spend a shitload of time and effort changing the flanges, and messing with it to make it work. buy a header, turbo and dp and ur done...with the td04, id have to cut off the flange on the header, reweld a wrx flange, and same goes for the dp. how long/hard was that for you? my dad is a welder so the welding is not the hard part, just making it all work.
Well if your dad is a welder then you wont be spending more than 1 or 2 hours modding the manifold. If you want to experiment just get the ebay tubular manifold, cut off the flange, and weld the subie flange on. As for the DP, I dont know how tight it is in there since its a '00, but I can't imagine its that hard for someone with in-house welding ability. I tack-welded my downpipe in my apartment parking lot!
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Old 09-27-2008, 10:24 PM   #22
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Oh snaps, well thats a relief. I was thinking if I go that route, I will get a fleabay tubular mani, and buy a cheap wrx dp and just cut/reshape/weld it to make it clear the engine/bay/etc. there is quite a bit of room for me to play with in there, so I dont think clearance will be an issue.

lol, wow the more I try to go a different direction the more sense it makes to stick with the td04...mainly because regardless of what everyone says, I still cant find a t25 or any of the other listed turbo's for a cheap price

still have some time to think it over but THANX SOOO MUCH for the input. I thought it would take alot more work to get it to fit. cutting/welding flanges isnt too bad
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Old 09-27-2008, 10:57 PM   #23
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FWIW the ebay mani you speak of is THIN THIN THING, and I'm sure you know crack all the time. Personally, if you can weld I'd build a manifold from weld ells. Then you got something. Add up the cost of the ebay mani and you could just buy weld ells instead and build your own.
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Old 09-28-2008, 04:05 AM   #24
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where can I buy said weld ells? the one I keep seeing on fleabay is 270. if I can pick up all necessary materials for about 200 I would definitely build my own
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Old 09-28-2008, 11:51 AM   #25
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Quote:
garrett t3 turbo w/ hks compressor

Notes: HKS GT2535 - 340 PS Output Trim: 56T; A/R: 0.86; Flange Type: T25 Flange; Wastegate Type: Internal COMPRESSOR: -Wheel- 56 Trim - 51.6 Inducer / 69.0 Major -Housing- 60 Inlet / 50 Outlet - 0.60 A/R TURBINE: -Wheel- 76 Trim - 53.8 Major / 47.0 Exducer -Housing- GT25/T3 inlets / Outlet specs: Internal GT25 outlet; 0.64, 0.86 A/R Skyline Type; 0.64 A/R
Actually those specs aren't too bad but without the compressor map, you can't know for sure. the specs read like it's similar, but just a tad smaller, than a GT2871. turbine looks identical actually.

probably too big for what you're looking for. but if the price is right....
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Old 09-28-2008, 10:26 PM   #26
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300 is what he's asking.

honestly im not that crazy about ultra fast spool up, so if its not TOO bad I wouldnt mind. AS LONG AS it has a nice midrange/topend. to me anything between 2800-3600 for full boost is good enough. the car will not be a daily driver for much longer, so i just want something that I can open up on the freeway every once in a while.


*edit:

OK HERE'S THE DEAL:

the td04 that I have in my garage I have a customer for (as of today). he will pay me for it exactly the same price the above turbo costs. meaning really the decision now is between the td04 and the hks gt25.....
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Old 09-29-2008, 01:34 AM   #27
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OK!!! so I went ahead and took the plunge. decided to keep the td04 laying around in the garage and not sell it JUST IN CASE, but the turbo I mentioned earlier, I just picked it up for 240....

here are some pics:







specs (according to him):
garrett t3 turbo w/ hks compressor

HKS GT2535 - 340 PS Output
Trim: 56T; A/R: 0.86;
Flange Type: T25 Flange;
Wastegate Type: Internal
COMPRESSOR: -Wheel- 56 Trim - 51.6 Inducer / 69.0 Major -Housing- 60 Inlet / 50 Outlet - 0.60 A/R TURBINE: -Wheel- 76 Trim - 53.8 Major / 47.0 Exducer -Housing- GT25/T3 inlets / Outlet specs: Internal GT25 outlet; 0.64, 0.86 A/R Skyline Type; 0.64 A/R

where he claims to have gotten it from long ago:
http://www.importparts.com/shop/prod...oducts_id=2941


what do you think guys? obviously I will have to rotate it, but we talked a bit and he says it will be great on the miata..the turbine wheel is not that big, so I dont think it will be TOO laggy, yet the compressor wheel is pretty big, so hopefully it will hold up in the higher rpm......IF ANYTHING, i always will have the td04 laying around to drop in.

any thoughts/comments?
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Old 09-29-2008, 02:14 AM   #28
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looks gigantic lol
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Old 09-29-2008, 02:48 AM   #29
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There's nothing T3 about that turbo.

The compressor is slightly smaller than a 2871 wheel, larger than any T3.

The turbine wheel is identical to the 2871.

What is the actual A/R or the turbine? .63 or .84?
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Old 09-29-2008, 03:15 AM   #30
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well it says .64 on the turbine (assuming thats what its talking about)..all the websites I visited also state this to be .64......the specs were provided by the previous owner, so Im not 100% sure how accurate it is. if you have any info about this turbo or any thoughts/ideas im all ears...

imo its in GREAT condition, and not as big as it looks in pictures......ill definitely be giving it a shot.....if anything ill just swap it out for the td04
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Old 09-29-2008, 03:22 AM   #31
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I'd compare is directly to the 2871. Although looks like a T4 wheel, turbine looks stage III or something. Probably end up being a great turbo. look up what the VW guys are doing with it....
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Old 09-29-2008, 11:05 AM   #32
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my one complaint is that my compressor is a little too big. that thing should be a beast and spool well.
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Old 09-30-2008, 12:25 AM   #33
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Quote:
Originally Posted by patsmx5 View Post
FWIW the ebay mani you speak of is THIN THIN THING, and I'm sure you know crack all the time. Personally, if you can weld I'd build a manifold from weld ells. Then you got something. Add up the cost of the ebay mani and you could just buy weld ells instead and build your own.
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Originally Posted by 18psi View Post
where can I buy said weld ells? the one I keep seeing on fleabay is 270. if I can pick up all necessary materials for about 200 I would definitely build my own
/\/\/\/\/\

anyone? Im really stoked to get this project under way, and need to know where is the best place to locate these materials. I assume I will need the mani -to-engine flange, the mani-to-turbo flange, and the dp-to-turbo flange.

I know its been discussed before just cant find it. anyone care to point me in the right direction would be AWESOME...
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Old 09-30-2008, 12:30 AM   #34
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Search weld ells, butt welds, etc. Just look around there are threads on this. jc rotor started a thread in the turbo kits forum about his future manifold and therin many criticize the design. You'll learn a lot just reading that thread. In short, search. Ace Stainless sells the bends, Weir Technologies sells the flanges (though so do others, but he's the cheapest, but he wasted a lot of my time and never got me my ****. But others have good luck so...).
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Old 09-30-2008, 12:33 AM   #35
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ok you are correct, I just found a few threads with some names mentioned. so far I have found this:
http://www.acestainless.com/index.ph...ewCat&catId=12

it looks like they are 7.75 a pop....ima keep looking for something cheaper hopefully
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