Greddy T620z VS SBD500X VS GT3076R
 

I currently have a Greddy Turbo Kit with the smaller T518z turbo. Built motor with 10.5 compression and 3.73 FD. At 1 bar I'm making around 320whp on 93. I swapped the diff to 3.73 because I daily my 86 and drive it on the highway every weekend for at least 4 hours at 90-100 MPH + first gear is horrible once boosted.

The T518z is an excellent turbo for anyone looking to make around 300whp instant boost in any gear even in 6th. Building my motor with 10.5 compression has slightly increased lag and installing a 3.73 rear diff didn't​ help either. Now I'm not complaining, it still spools up instantaneously but I no longer can floor it without down shifting which isn't a bad thing as it forces me to get into the powerband instead of being lazy and just floor it knowing it's gonna spool anyway.

However, I'm looking for more power now but I really don't want to create anymore lag. Target is +400whp. One member here swapped the T518z with a GT3076R (90mm trim, .86 A/R, T25 IWG). He no longer owns a twin and doesn't reply unfortunately but he claimed it spooled just as quick with much more power.

The T620z is definitely gonna spool slower as the dyno sheet provided by Greddy shows and I've read people who have the T620z asking for more power which is what I'm going through now and I don't want to upgrade turbos every year. But since I've made 320 with the T518z I don't see why the T620z can't make 400whp or even 450whp.

Finally there is the SBD500X upgrade kit which claims has the same specs as a GT"X"3076R. No idea what that means and there is no detailed info about this kit other than a 58mm inducer however the GTX series spools a tad slower than the GT series which worries me even more about this kit.

The T620z and the SBD500X upgrade kits are appealing since they're a direct bolt on. The GT3076R does bolt on but I'll need a few couplers, installation kit, oil and water lines, etc. I'll probably reuse the 1 bar actuator that came with my T518z but I'm not sure if it is going to be enough to reach 400whp on the GT3076R.

So my main question is which of these 3 would provide the best spool time to +400whp? No E85 For me as it is not available here.







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I have the T620z currently. Built motor just went in, but I still haven't been able to drive it. From what @Moto-Phil tells me, 400WHP on pump gas for the T620z might be a little stretch.


I could be wrong.

It's crazy to think a T518z can make 400whp with E85 but a bigger T620z still can't make the same amount on pump gas. Let's hope someone can confirm this otherwise it's either the SBD500X or the GT3076R for me.

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I was at 290 something with the t620z on pump gas. Granted I'm an automatic, so if I was on manual, it'd be closer to 300.

The difference between a gt3076r and a gtx3076r (what the sbd500x uses) is the gtx is a ball bearing turbo while the GT is journal bearings. The gtx will spool faster but both require oil and coolant lines.

I've heard people say the same and others say that the GTX series is less efficient below 20psi. Regardless, I think SBD doesn't actually sell a GTX3076R but a turbo with the same size or "specs". Anyone from SBD still around on the forums to chip in?


I haven't​ checked if Garrett makes a GTX with a T25 housing. Will a GTX2876R be able to make +400WHP? Might be the sweet spot since it'll definitely spool faster and at 20 psi I'm pretty sure it would be in the 400hp range. best of both worlds I guess.

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True Garrett GT series turbos are dual ball bearing, not Journal bearing.

Correct on the SBD turbo, they aren't using an actual Garrett unit. I've seen lots of guys make 400 on GTX2867Rs. There is also the GTX29 series to consider.

There are no GTX2876Rs with a T25 flange and the GTX2976Rs that come with a T25 are only made in Australia and cost about $2000. I don't want to get into the mixing and matching of housings etc.

That narrows it down for me to the GT3076R and now it's either .64 or .86 housing.

How restrictive would the .64 be at top end?

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I was looking at the dyno sheets Greddy provides and they claim 430HP to the wheels at about 20 psi. Not sure why everyone is doubting the T620z... But still you can see the T518z out spools it all the way to 3750 RPM.

Lots of misinformation here.

We take a GT3076R CHRA (Ball-Bearing) and upgrade by replacing the factory cast compressor wheel for our custom Billet Wheel.

A GTX3076R is a GT3076R with Garrett's Billet Compressor Wheel. All other components are 100% identical.

We're basically making our own, cutting some cost out of the equation and reducing pricing to the consumer.

A few months ago we began testing an aftermarket ball-bearing CHRA, which we have had very good luck with. We've had zero failures or complaints thus far.

It's not Garrett brand, but we feel it offers similar performance at 50% less money. We retail this kit for $3499. We use the same custom billet compressor wheel no matter which CHRA you buy.

If you want the Garrett CHRA, it's a $500 upcharge. I personally would choose the less expensive option, as it also includes a 1-year warranty. Same as Garrett components, and you can put that $500 towards other mods.

I should add, we have made over 500whp on our 500X Kit ;)

Hence "500" X.

I sent you guys an email a couple of weeks ago asking if you could sell me a header only for my Greddy turbo kit as mine cracked along with a pre-welded oil pan. One of your representatives, Chris Riggs, replied:

"We are unfortunately unable to supply parts to non-SBD customers, are we BARELY have enough inventory for our own customer needs"

I followed up with an email last weekend asking if I could buy your 500X upgrade kit and if that would qualify me as a customer and I haven't heard back yet so I assumed that's an automatic "no". PM me here if you can make me an offer for the upgrade kit + header + oil pan.

Edit: Just realized you might be the same Chris. Please check your email.

I'll check inventory on the manifolds and see if we have one can spare to sell.:cheers:

https://youtu.be/gnaXUmkZGWI

SBD400X FRS E85 14psi vs EVO x Full bolt on e85 28psi

You can also consider a EFR 7163 in T25 footprint, which will allow you 500+whp and outspool the GTX3076 based options. The EFR's can now be specced with EWG housings and blank offs purchased for the BOV if your setup is running a normal style BOV.

Stay away from anything sbd sells as they are all cheap Chinese knock offs. I'm running the gtx3076r gen 2 and my power band looks like a supercharged engine not a turbo. Honestly it's the best suited turbo for this engine.

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I actually went with the GT3076R. It's definitely more laggy than the T518z but pulls a little harder up top with the same amount of boost. Tune is not finalized yet as my fuel pump isn't here so I'm still running at 1 bar (wastegate/actuator pressure) same as before. Will be tunning for +20 psi later.

Clearance is VERY tight with the Greddy kit. I ordered a low profile fan kit for a cleaner look later but for now it works perfectly.

The videos aren't a very good comparison as it spun considerably more with the GT3076R and I had to let off. But from 120-160 you can tell the GT30 is pulling slightly quicker at the same boost.

https://uploads.tapatalk-cdn.com/201...026fe8fcf4.jpghttps://uploads.tapatalk-cdn.com/201...984f17b957.jpghttps://uploads.tapatalk-cdn.com/201...24f85cbebd.jpghttps://uploads.tapatalk-cdn.com/201...7ff8cfd8ee.jpghttps://uploads.tapatalk-cdn.com/201...a250b83477.jpg

http://cloud.tapatalk.com/s/595dbc0f...084532_098.mp4

http://cloud.tapatalk.com/s/595dbdde...042531_785.mp4


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no turbo blanket? would assume you'd get one being in the UAE.




Did you replace your mushroom filter with a better flowing one?

I had a heat blanket on my T518z but it was ironically burnt on the down pipe side. I didn't realize it until I took it off as I was planning on reusing it. I received a replacement but I wasn't able to install it without taking the car a part again. I'll install it when I do the low profile fans + the Jackson racing radiator.

The filter in the picture is a Greddy 2.75 inlet filter. That's the only other Greddy filter (made by AFE) that would fit other than the mushroom airnix that came with the kit.

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So I have ran the SBD 500x kit on my brz for a month now. Honestly I probably hit full boost at around 3500 rpm (10 psi). The turbo is a quality piece, and all the parts you can pretty much interchange with the gtx3076r. There are plenty of people who hate on the kit ( I was one of those people before I got one) but honestly the kit fit without any issues perfect. I can also add that the customer service that Chris and his company provide is honestly none that I have seen. He is pretty much always available to help and figure things out. On this forum there arent many guys posting information about this kit as there is on the Facebook page. The FB page is the one that has the most information about SBD kit, so honestly before you can make a good opinion you need to see what the owners are doing on that page.

I actually joined the group and it's very informative. I was planning to buy the 500X upgrade kit when Chris posted here along with other parts. I had a week off coming and it was the only chance I had to work on the car to upgrade the turbo. I emailed/messaged Chris and told him what I needed and when. He didn't reply on my email but messaged me back on Facebook.

He said it would take a week to get everything ready. He seemed not very eager to help and I felt I had to put a lot of effort to get his attention. The last message I sent him on the 12th of June was asking for a quote for everything we talked about and he said he will provide it. Two days later, nothing from Chris, I pulled the trigger on the GT3076R.
It has been a month since I contacted him and he still didn't provide a qoute or anything so it's a good thing I did go with the other option.

I would probably be running his turbo right now if he actually got me that quote and shipped it within a week but he seems to be selling full kits left and right that he doesn't mind losing a few grands on a potential customer...

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Is is true, as I was in Iceland with my brother on vacation backpacking. VERY remote place I might add.

Glad you got things handled.

It's no secret we struggle with maintaining inventory, as such we have made it well known we don't supply Greddy customers.......as to be honest, we shouldn't have too.

With that said, we do take care of our internal customers.

I'm sorry you had issues with their parts, I get numerous people...EVERY SINGLE WEEK...with Greddy kits wanting us to supply them with XYZ components....

We're simply unable to support any kits beyond our own.

update on the t620z kit. Just got back from the dyno. Got 353whp/268wtq on 18lbs of boost and about a E47 reading. Motor is built at 10:1 compression.

Surprising, we see 400whp out of our 400X @ 14-15 PSI all day long.

The 500X makes 500whp @ around 20 PSI.

I would have expected more from the 620Z, hum....

This is on a 9:1 Compression motor, therefore the comparison isn't quite there, on a stock compression motor and e85 it would be around the same.

He said 10:1 in his post above, which I wouldn't think would cause such a drastic drop in power.

Our SBD500X kits on the stock motor make 320-330whp on 93 octane all day long.

I guess I just expected more from that turbo, but I've never seen any graphs of it to compare.

I have made 320whp with the T518z on pump gas at 14 psi with a 10.5:1 compression engine. Every Dyno reads different and without a baseline we would probably never know.