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Old 05-03-2012, 04:18 PM   #1
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Default Garrett GT3076R with FM2 Cast Manifold?

Hi everyone,

I'm in the final stages of building my BP (83.5 Supertech 8.6, SGI rods, ACL race & ARP everything, boundary oil gears + 99 head) and I'm looking at options to replace my turbo.

Now right from the start I'll say I'm not interested in swapping my entire hot side for a tubular set up. I'd love to but I simply don't have that kind of cash.

I'm looking for a turbo to replace my Pulsar T28 to take advantage of the newly built engine and stumbled across an internally gated Garrett GT3076R with a 0.64 A/R.

Now I have a few questions:

1) Has anyone successfully mated a GT3076R with an FM2 cast manifold? I'm thinking it'll need some serious modification to the engine bay?

2) What do you think spool will be like? I'm used to a little lag with the journal bearing T28 and see full boost around 4200rpm at the moment. To be honest I don't mind the lag. I'll be running BEGI Separated Gasses downpipe and a homebrew 3 inch exhaust

For info the car will be used for a mix of weekend highway and track work.
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Old 05-03-2012, 04:29 PM   #2
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I've successfully tuned a 1.8L w/VVT, a 3076 (externally gated though) and a 3" exhaust that had full spool (29psi) at 4000rpm (3950 IIRC). The VVT did wonders with spool, so did the EBC. So with careful tuning, spool could be good.
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Old 05-03-2012, 04:48 PM   #3
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What kind of manifold were you using?
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Old 05-03-2012, 11:10 PM   #4
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I have done that. With a .86ar too. (thought it was a china 3076). Worked great, didn't require much modification at all, and was at full boost by 4600 or something like that. Check my old build thread if you're interestd
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Old 05-04-2012, 02:52 AM   #5
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FM does it all the time. Make sure you get a T2 housing, though.
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Old 05-04-2012, 03:34 AM   #6
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Quote:
Originally Posted by GrahamC View Post
What kind of manifold were you using?
Custom header.
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Old 05-04-2012, 04:35 AM   #7
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Been there done that.

Above 360-400hp depending on your dyno, you will be flow limited. Above 20psi, I saw about 2hp gain per psi. The turbo could have flowed more. The issue was the log manifold. I had 3" uncatted exhaust.

That said, drive the car like a naturally aspirated miata (rev to red) and you will have boatloads of fun. 4000-5000RPM full boost on the street is not bad at all. You will not be faster than God, but you will have fun.
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Old 05-04-2012, 08:45 AM   #8
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I had the FM cast manifold & GT3071.

Needed MINOR engine bay mods but that's it.
Although I'm running a T28 now and LOVE the mods I did...way easier to take off turbo.
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Old 05-04-2012, 01:54 PM   #9
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Thanks guys. I'm waiting on the guy getting back to me after I made him an offer on the turbo. If I don't get it cheap I'll not bother and get a more suitable turbo.
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Old 05-12-2012, 04:54 PM   #10
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Graham you sob reply to me on the nutz forum arghhhhhh
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