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Old 11-04-2012, 05:08 PM   #1
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Default recommend me a new turbo

so... during the last race of the season one of the uprated steel bearing cages in the Garrett GT2871r (60a/r compressor & 64a/r turbine) shattered. parts went through the whole engine causing extensive damage but that's another story. was making 355bhp

looking at replacing the turbo but we will be going for more power. looking for around 400bhp+. we would like to keep the fm manifold so in need to be something that will fit but a new exhaust will be made so that side is not important.

so what do you guys recommend? this is a race car and only ever sees track use.

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Old 11-04-2012, 07:13 PM   #2
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you should be able to get 400whp with that turbo. That turbo is going to be the best t2 internally gated turbo on the market. You could go .86 ar but that will be super laggy. I have seen guys make like 418whp with the 2871r .64

If you are willing to ditch the mani id go gt3071r externally gated t3. External wg and t3 flange is just a much better setup overall.
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Old 11-04-2012, 07:14 PM   #3
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I've got a street car, but same turbo, similar power goals, and similar "I hate to ditch the T25 manifold that's been good to me so far" mentality.

I bought a .86ar exhaust housing to upgrade to, and I keep looking at the GTX2867, but I'm just not convinced it's worth dropping the money on. Are there really any other T25 options out there? Subscribed.
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Old 11-04-2012, 07:25 PM   #4
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Quote:
Originally Posted by Slidinmiata View Post
you should be able to get 400whp with that turbo. That turbo is going to be the best t2 internally gated turbo on the market. You could go .86 ar but that will be super laggy. I have seen guys make like 418whp with the 2871r .64

If you are willing to ditch the mani id go gt3071r externally gated t3. External wg and t3 flange is just a much better setup overall.
Ahhh, clearly a noob that knows what he's talking about (welcome to the site), it's like you came to us from the Honda world. Our heads flow like a virgin butthole; 350whp is unfortunately very optimistic on that turbo in a miata.

A T3 flange would definitely option the options up significantly.
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Old 11-04-2012, 08:08 PM   #5
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EFR6758 like Soviet? 400whp, and Soviet had no headwork/stock IM and everything. Should be able to squeeze a bit more power out of it.

I know you don't care as much about spool on the track, but it seems silly to go with anything else, those EFRs are really that much better than everything else.
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Old 11-04-2012, 08:26 PM   #6
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Quote:
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That turbo is going to be the best t2 internally gated turbo on the market. .
Wrong, the EFR 6xxxx are the best t2 internally gated turbos on the market. At least as far as I can tell.

OP = The answer is the EFR 6758
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Old 11-06-2012, 06:33 AM   #7
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pleased the efr 6758 was mentioned as this is what i was looking at. think i will have a search on here to see if i can find some reviews.

i realise the turbo i had was capable of my power goals but now i have the opportunity for change why not try to find someone better.. as far as i can tell all Garrett turbos are made in china and the quality will surely suffer. i may be wrong and to be honest have not looked far.
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Old 11-06-2012, 10:15 AM   #8
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Read the last half of Soviet's build thread, that's the only review you should need.

It will convince you the EFR 6758 is what you want/need. Made in the USA

Also, 949 Racing and Savington are putting EFR's in their stoopid fast race cars, replacing Garrett turbos. That should also help convince you.

Oh, and Indy cars and ALMS cars use the exact same turbos. That should help convince you too...
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Old 11-06-2012, 11:31 AM   #9
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Technically the Indy cars use 2 6758s, but that's close enough for me!
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Old 11-06-2012, 11:55 AM   #10
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Actually they can use either 2 6758s, or a single 9xxx.

Something to that affect.

ALMS uses 2 6258s.

Point is, you can get a turbo good enough for indy cars, with an integrated BOV and wastegate for $1500.

No other $1500 turbo even comes close
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Old 11-06-2012, 12:13 PM   #11
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I just want ONE EFR6258.
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Old 11-06-2012, 12:36 PM   #12
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Has anyone tried the 6255? Probably wont make 400whp on a miata, but at 44lbs/min seems like it would be great for the 200-350ish hp range and non built engines.
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Old 11-06-2012, 12:48 PM   #13
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Quote:
Originally Posted by hochkis View Post
Has anyone tried the 6255? Probably wont make 400whp on a miata, but at 44lbs/min seems like it would be great for the 200-350ish hp range and non built engines.
I can't imagine it would spool any quicker. If you put that on a stock motor I think you would throw a rod before you even put down 250 wtq because it would bring on the tq so quickly.
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Old 11-06-2012, 01:02 PM   #14
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so where is the best place to supply one? been trying to get some prices. seem to be around 1000 ($1600) over here plus tax. there must be a better supplier on your side of the pond.

after a little reading i now really want one!! should make 400bhp easily on our engine without running silly boost.
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Old 11-06-2012, 01:30 PM   #15
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I just want ONE EFR6258.
Me too

But first, I need to buy a miata to put said EFR in...
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Old 11-06-2012, 05:42 PM   #16
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I thinkthe PTE 5557 should deliver the goods .
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Old 11-06-2012, 05:58 PM   #17
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Quote:
Originally Posted by mr2daj View Post
so where is the best place to supply one? been trying to get some prices. seem to be around 1000 ($1600) over here plus tax. there must be a better supplier on your side of the pond.

after a little reading i now really want one!! should make 400bhp easily on our engine without running silly boost.
Thats the normal price pretty much.

Also, I dont think I've seen the 6255 for sale anywhere and even if it was I would think you'd be able to cross the surge line with it on a 1.8
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Old 11-06-2012, 06:51 PM   #18
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I can't imagine it would spool any quicker. If you put that on a stock motor I think you would throw a rod before you even put down 250 wtq because it would bring on the tq so quickly.
Too bad techsalvager didn't have any money to spend, he might get close to his 200ft-lbs at 2000rpm with that one.
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Old 11-07-2012, 04:17 AM   #19
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Would the 6255 be a good choice for a 1.6 built engine?
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Old 11-07-2012, 10:56 AM   #20
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Just get the 6258.
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