gt2871r vs gt3071r - Page 2 - Hyundai Genesis Forum
Engine and Turbos This section is for discussing engine parts (for example, bottom or top end), turbos (upgrades, porting, etc), or other engine related parts or swaps.

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post #11 of 30 Old 04-05-2010, 08:02 PM
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Originally Posted by Tony20Tgen View Post
I was thinking gt30 first but when I found out It needed rods after just north of 350whp I figured what the hell if its built lets give it a built engine sized turbo GT35R. So I am building it for a 35r as we speak.
I will be forging my internals as well, I'm only looking for about 400-450whp. I think I could possibly squeeze it out of the gt30r. You think it would be safer all around with the gt35r though?

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post #12 of 30 Old 04-06-2010, 08:07 AM
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Originally Posted by genjuice View Post
you just cant say because the number is bigger the turbo is bigger.You have to know wheel size for both turbine and compressor, exducer and inducer sizes of both wheel and A/r.Once you take all the numbers into account you can determine which flows more cfm and which spools better.
Max boost is not how you determine how fast a turbo spools up.When dealing with similar turbos you compare how fast a turbo spools to cetain psi.Most tuners choose 20 psi as a good gauge.
So to sum it up the two turbos I used in the OP, the 3071 will get to 22 psi quicker and more efficient.
Reason being smaller A/R.
I was making a generalization. Going off the Garret documentation, in general, the higher the number the "bigger" the turbo. Not trying to start a fight, this is a discussion forum right? Just discussing my experience with these turbos. Also, it's important to look at these turbos in relation to the motor being used. Obviously these turbos will react differently on different sized motors. Regardless of the turbo specs, if the motor isn't big enough to push enough air to bring the turbo into its efficiency range, all the specs mean nothing.

Last edited by davisk6; 04-06-2010 at 08:15 AM. Reason: tried to be more specific about my generalizations...
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post #13 of 30 Old 04-06-2010, 08:10 AM
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Originally Posted by Shadouwynd View Post
I will be forging my internals as well, I'm only looking for about 400-450whp. I think I could possibly squeeze it out of the gt30r. You think it would be safer all around with the gt35r though?
You should be able to get it out of a GT3076 with the right supporting mods. A GT35 would be able to get you there also, but you would need to account for the additional CFM. I'm assuming you are also doing a much larger intercooler and intake manifold, right?
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post #14 of 30 Old 04-06-2010, 08:54 AM Thread Starter
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Quote:
Originally Posted by davisk6 View Post
I was making a generalization. Going off the Garret documentation, in general, the higher the number the "bigger" the turbo. Not trying to start a fight, this is a discussion forum right? Just discussing my experience with these turbos. Also, it's important to look at these turbos in relation to the motor being used. Obviously these turbos will react differently on different sized motors. Regardless of the turbo specs, if the motor isn't big enough to push enough air to bring the turbo into its efficiency range, all the specs mean nothing.
Discussion is good.The only problem is when people generalize things get confusing.
I will go back to the basic and see if it makes more sense from where im coming from.
The gt2871 and the gt3071 have the exact same compressor wheel 71 mm .
The two turbos I used as an example the 3071 actually has a smaller compressor housing.
Where these turbos differ is the turbine housing.The gt30 turbine housing generally holds a 60 mm wheel and the gt28 turbine housing usually holds a 54 mm wheel.
On the gt3071 it has the option of three different A/r sizes for the turbine size, not sure how many for the 2871r.So as you can see most if not all the differences come from the turbine side of the turbo.
By the way If it sounded like I was attacking you I apologize, I never meant to come across that way.
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post #15 of 30 Old 04-06-2010, 09:32 AM
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Originally Posted by davisk6 View Post
You should be able to get it out of a GT3076 with the right supporting mods. A GT35 would be able to get you there also, but you would need to account for the additional CFM. I'm assuming you are also doing a much larger intercooler and intake manifold, right?
Oh yeah, definitely. Besides Forged Internals from Buschur and AGP, I will be getting the full turbo upgrade kit from Lovefab. They only offer these turbos though: Garret GT series turbo(3071R, 30R, 35R) that's why I was looking at the 30R vs 35R mainly.

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post #16 of 30 Old 04-06-2010, 09:39 AM
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I think you guys are short-changing the Theta in terms of flow ability. Granted, putting a GT35 on a "stock" motor is not ideal, but it would still function. To properly execute using a GT35-series unit, some head work, cams, and porting would certainly go a LONG ways making it more feasible. Back on topic now, either a GT28-series or GT30-series on this motor should spool pretty quickly. All the dynographs I've seen so far are pretty linear using the GT30-series units and I can imagine that a GT28-series would be less linear with more emphasis on low-end power. Personally, I think that the GT30-series is better suited to our motor if you desire a linear powerband and a GT28-series is better suited if you want a stock-like replacement that has a higher power potential. The only issue is that when you get into the larger trim-size GT28-series turbos, there is a line you cross somewhere at which it would be more beneficial to jump up to the GT30-series.

To those wondering about the GT35-series units, the turbo I'm using fits somewhere in-between the GT30 and GT35-series so it should give you guys a better idea as to what to expect. The biggest difference looks to be the spool time for the unit I'm using, which should spool as fast or faster than a GT30-series. I've considered testing out a GT35 unit as well for comparison but that's TBD at a later date.

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post #17 of 30 Old 04-06-2010, 10:12 AM Thread Starter
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^+1
Thats why im not a fan of the 2871. You put a small trim with a small a/r turbine and its not going to make much more HP then the disco, you put a bigger compressor trim with a bigger turbine A/r and it wont make any more Hp then the 3071 but will be more laggy.Now if you put a 56 trim with a .64 Ar turbine thats about the only 2871 that would be worth it.But then if you were going to do that you might as well go with the gt3071 56 trim .50 a/r compressor with a .63 a/r turbine .
Oh the possibilities lol
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post #18 of 30 Old 04-06-2010, 12:10 PM
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There's really nothing wrong with either the GT2871 or the GT3071. Both are sweet. I personally would go with a GT28. I prefer a turbo with more usable power than one that produces higher overall output. The "meat and potatoes" of the GT30 will be at 3500 and above, where as the GT28 will be closer to 2800. I mainly drive on the street, so quicker spool and better low end are what I want. HP freaks will definitely want at GT3X series no doubt.
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post #19 of 30 Old 04-06-2010, 06:21 PM Thread Starter
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I got the specs from ATP today.
Compressor wheel is the same 71 mm
compressor wheel trim is the same 56
compressor A/R is the same .60
Turbine A/r is the same .72
Turbine trim 2871 is .76
Turbine trim 3071 is .84

Last edited by genjuice; 04-06-2010 at 06:38 PM. Reason: I put .72 instead of .76
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post #20 of 30 Old 04-29-2010, 10:06 PM
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I figured I would ask this question here so that I wouldn't have to start a new thread since its related to turbos.
I'm planning on getting a turbo kit for the 2.0 Track. I've been looking at the APT GT2871R and the GT3071. Obviously I'm a guy, so I want the most hp available. Sort of like Tim Allen on 'Home Improvement'.
I'm really glad I found this thread because it did answer some very important questions I had for these turbos anyway. Davisk6 had some good points made as well as everyone else.
I'm planning to use to car as a DD with very little to no track use. Mainly because I won't have good access to a decent track. Davisk6's points about the GT2871 being a little more 'streeable' seemed very valid and pointed me in the right direction.

One question I had was: On a stock 2.0T model, properly broken in, what other mods would compliment the GT2871? I'm not looking to break the bank, but I also don't want too much HP that I'll damage the engine from 'misuse',
I'm reading that 20 psi is a good gauge, but i'm curious as to what the gen coupe could handle with a turbo like this?
Obviously I would be getting the turbo professionally installed and then tuned from there.
Sorry I'm kind of all over the place...just really inexperienced with this whole thing.
Either turbo would probably suit my needs... but the 350+ hp sounds mighty tempting, but I won't be drag racing it or any track use. The car would just be street use with maybe a quick run from point A to B here and there and probably just bragging rights.
I kind of want a car with show AND go. But don't worry, I'm not going to 'rice' it out. Anything I do will be tastefully done.

Regards,

Joe
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