Brettus Turbo IV Garrett G30-660
 

I figured now that I have the actual turbo in my possession it's a good time to start a new thread. There has already been some discussion on this over in my turbo III thread (discussion starts here : https://www.rx8club.com/series-i-maj...2/ ) .
Reasons for choosing the Garrett 30-660 : finally there is a no compromise, high flow, quick spool, compact turbo that will actually fit nicely on the Renesis in a low mount position.
Goals:
1/420-430whp
2/Widest power band ever seen on a Renesis
The setup :
Garrett G30-660 1.01AR
Manifold : self built log style (see Turbo III thread)
Wastegate : 38mm Tial
Intercooler : Custom vibrant vertical tube
BOV : Synapse DV
Fuel : modified stock pump basket with 340l/hr AEM pump
Injectors: OEM brown P1 , uncapped yellows P2 and sec
Tuning : Bretttus self tuned with Mazdaedit





Huge thanks to Gregs for hooking me up with this little beauty!

https://cimg2.ibsrv.net/gimg/www.rx8...b3df6031c5.jpg
https://cimg0.ibsrv.net/gimg/www.rx8...416ab82d41.jpg
https://cimg3.ibsrv.net/gimg/www.rx8...2cc171bf0d.jpg
https://cimg6.ibsrv.net/gimg/www.rx8...7bb8d454a2.jpg
https://cimg8.ibsrv.net/gimg/www.rx8...69b231ce71.jpg

Compressor flow diagram . Should provide just enough to get into the low 400s.

https://cimg5.ibsrv.net/gimg/www.rx8...b0b93273bc.jpg

I'll be making another version of my log manifold first seen in my turboIII thread . I really love how that turned out so time to turn it up a notch !

https://cimg4.ibsrv.net/gimg/www.rx8...b4983a38ea.jpg

Brett, your never ending quest for small improvements is a great story to follow. Having learned a ton of things about turbos and related items from your previous thread I will be following to see how this turns out.

Maybe make a few extra manifolds to sell in the RX8 market, I'm certainly not the only one interested in purchasing it.

First one will be installed in a country near you ....soon :)

nice, looking forward to it

Why do I feel punished for living in a place with 6 months of winter? :banghead: on the plus side being patient I can just copy an already proven system complete with tuning.

Brett, maybe need a memory refresher, but at 18psi are you using water/meth injection or just relying on ethanol mixed fuel?

I haven't been running at 18 ,16 has been my limit on the 3582 and running E40- E60 when I do. The chart just demonstrates that this little pea shooter turbo will actually go there reasonably efficiently. Whether I go that high or not :dunno: :suspect:

Mock up showing engine mount setup.
https://cimg3.ibsrv.net/gimg/www.rx8...b9482a648f.png

you’re not far off from my OE-type engine mount/bracket eliminator mod, dang kid at work supposedly doing the drawings for me keeps stringing it out though. I had intended to send one to you for testing. It will free up a bunch of space.

I agree that eliminating the mount is a biggie .
The design above only works with my manifold but together they work really well and there really aren't any compromises any more.
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sure there are, but we can save that for my thread

on 2nd thought, it may not work out on RHD. So for your situation that may be correct. Keep forgetting that the toilet bowl swirls in the opposite direction down there than up here.
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Nice! Considerable more space for the comp intake. Hopefully not too many gymnastics required to maneuver the steering column.

If by 'toilet bowl' you mean 'steering column' then yeah ..that's still there.

no, I just forgot it’s on the opposite side down there, the same way a whirlpool spins the “opposite” direction in the southern hemisphere than in the north

so you have more constraints with that there than we do here, my apology for overlooking it

G30-660 vs GTX35 (To4b) They look very similar . G30 comp hsg is slightly bigger than the TO4B , GT 35 is slightly longer (center of turbine to center of comp outlet). The 30 has a 0.7AR vs 0.6 for the TO4B ..... Garrett did a lot of work to get a larger AR within the same dimensions.
https://cimg4.ibsrv.net/gimg/www.rx8...8b6288095.jpeg
The GT35 turbine (top) supposedly flows the same as the G30 (bottom) . We will see................
https://cimg6.ibsrv.net/gimg/www.rx8...ea078031b9.jpg
Took a couple of attempts to get compressor lining up just right . 1.01 Turbine housing is very tight fit but at least it does fit. Barely enough room for my heat shield.
https://cimg8.ibsrv.net/gimg/www.rx8...ed99f71f4b.jpg

[QUOTE=Brettus;4934702]G30-660 vs GTX35 (To4b) They look very similar . G30 comp hsg is slightly bigger than the TO4B , GT 35 is slightly longer (center of turbine to center of comp outlet). The 30 has a 0.7AR vs 0.6 for the TO4B ..... Garrett did a lot of work to get a larger AR within the same dimensions.
https://cimg4.ibsrv.net/gimg/www.rx8...8b6288095.jpeg

I'm curious to see what type of response you see from switching from the T04B hosting to the new one. I was running a GT3076R with a T04E compressor housing and I switched to GTX3076R with a T04B and there was a noticeable difference in torque below 5K. The GT30 felt like it had more power down low but it fell on it's face up top. The GTX has more airflow based on the MAF readings and doesn't fall in it's face up top. I think I'm going to switch back to a T04E in the future.

Yes , I think there is something to that. I would def. go for the larger hsg if it fits . I have long held a suspicion that the smaller hsg was an issue (especially with the 82mm comp.) and that was part of the decision to take the leap into this new turbo, knowing that the published map was created with the hsg I'd be using.

any pics from above?

.

*following with interest*

Brettus, your never ending pursuit of knowledge / results is quite commendable my friend.

Cheers Jedi.
These last few days I've been trying to get this thing together and it's going really badly. I think I need to go away ........... and come back.

sometimes that's a good approach, just walk away for a bit and come back with a fresh perspective.
you'll figure it out, just a matter of time.

sorry for your troubles and also sounding like a broken record by asking again, but will a T3 turbine housing help?

Was also curious to confirm the ID of the turbine inlet manifold adapter flange; thinking it should be approx. 60.xmm ID?
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Team , it's nothing to do with that. The turbo fits fine .
It's just me atm.

Re the adaptor..... Don't have access to it any more but we discusssed it in the other thread and I gave you a dimn. (measured with vernier calipers).