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Any feedback on GReddy Turbine Kit T620Z in r33 GTST/RB25DET?

jacobzking
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jacobzking Contributor

jacobzking

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Posted

I'm looking for a direct bolt on turbo upgrade for my 93 R33 GTST.  Anyone have experience with this Greddy T620Z turbo upgrade? I'd like to be able to run about 300hp to the rear wheels without putting too much strain on the turbo. I do daily drive the car.  Pretty stock car with basic bolt ons (exhaust outlet, down pipe, high flow cat and catback exhaust along with intake and FMIC).  I'l probably have a Haltech plug n play on the car before installing the turbo.

https://www.greddy.com/products/turbo-upgrade-ecr33-er34-t620z-rb25-11520057

 

Also, any thought on this much boost on a 30 year old motor with 250,000KMs?  Engine feels/sounds strong for what it's worth.

 

Thanks you in advance!

Murray_Calavera Mentor

Murray_Calavera

Posted
Posted

A couple of things, firstly omg that turbo is expensive! $3,000 USD for dinosaur technology is robbery. You could buy a G series turbo and have a good amount of change instead. 

If you want a good budget option, have a look here - https://hypergearturbos.com/product/rb25dethighflow/

If you are keen to spend more, have look at the modern turbos, Garrett G series, Borgwarner EFR, etc. Have a look at the RB25 dyno results thread for inspiration. 

If you upgrade your turbo to something that will support the 300hp you want and only "probably" have Haltech ECU, your car will only "probably" run. Actually, no it won't run. You are going to need the ECU and injectors at the time you do the turbo upgrade. 

No thoughts on "this much boost" as you didn't say how much boost that actually is. Having said that, plenty of unopened RB25's making even more power then what you are chasing. 

 

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Duncan Grand Master

Duncan

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300hp (225kw) is barely outside the standard turbo's range with a bit of extra boost in it (200ish).

If you are going to change the turbo you should aim for 250-300kw (330-400hp) to make the expense worthwhile :)

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joshuaho96 Veteran

joshuaho96

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Posted

Wasn't there some discussion of how the Hypergear high flow actually has different dimensions so it's not a true bolt-on replacement? Honestly if that's the case I would consider just going true twin scroll and go down a massive rabbit hole of getting all that to package as close to stock as possible.

GTSBoy Grand Master

GTSBoy

Posted
Posted
52 minutes ago, joshuaho96 said:

Wasn't there some discussion of how the Hypergear high flow actually has different dimensions so it's not a true bolt-on replacement? Honestly if that's the case I would consider just going true twin scroll and go down a massive rabbit hole of getting all that to package as close to stock as possible.

Yeah - the Hitachi core is huge (long) and the core Tao uses is quite short, so the compressor housing moves backwards.

But I wouldn't let that stop me. In fact, I didn't.

But I imagine that the correct thing to do is to go for the latest G series on an Artec manifold. In V band. And f**k the twin scroll, because short short Artec manifold runners + easy install/removal/adjustment outweigh the small loss in spool.

joshuaho96 Veteran

joshuaho96

Posted
Posted
1 hour ago, GTSBoy said:

Yeah - the Hitachi core is huge (long) and the core Tao uses is quite short, so the compressor housing moves backwards.

But I wouldn't let that stop me. In fact, I didn't.

But I imagine that the correct thing to do is to go for the latest G series on an Artec manifold. In V band. And f**k the twin scroll, because short short Artec manifold runners + easy install/removal/adjustment outweigh the small loss in spool.

Yeah, but twin scroll is the OEM thing and I love pain.

joshuaho96 Veteran

joshuaho96

Posted
Posted
11 hours ago, GTSBoy said:

There's no twin scroll on the OEM turbos. On the manifold, kinda, yes. Not on the turbos.

Rather it's the OEM thing these days. I don't think I see single turbo monoscroll on any I6. Obviously back then twin scroll turbos weren't readily available so I saw a lot of "twin entry" designs which had a divider on the manifold but nothing on the turbo.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
45 minutes ago, joshuaho96 said:

which had a divider on the manifold but nothing on the turbo

And that alone was a huge improvement to single merge collector.

Those early "experts", used to grind down the divider for "flow" and lost response.

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