GTX3076 or GTX2867

[mrharry]

Hey guys right now i'm deciding which size turbo to go for.

the purpose of my car is to be a track/street car

i have thought about the gtx30 but i think it will lag through the corners(correct me if im wrong)

does anyone have a rough idea on when the boost kicks in on the gtx30 and gtx28?

[midnight23]

too many variables, fuel, tuner, turbo kit design.

go to the turbo kit compilation page and go through all their dyno charts, most of them run 28s and 30s, general consensus I hear is that people who went with the 28 upgraded or want to upgrade to a 30 because the spool difference is minimal.

[cdrazic93]

Not to throw you off your horse of choosing which GTX series, but the BW EFR 7163 will make the same power as the GTX3076 and spool about 400-500 rpm sooner, those can be found on the treadstone turbo kits. Just throwin in the wild card

[Coheed]

Gtx3076r is a decent turbo, but adding more flow to a (IMHO) mismatch turbo is going in the opp direction of what I would find ideal. The GTX3576r is a better option going that big. The GTX2867 is a pretty awesome turbo. Very well balanced, and will perform well on the street and track. But... the GTX3576r is much larger... and you can't really go too big, can you?

The big power nut in me wants to see the larger turbo in use, but transient response in that size will be nothing compared the GTX28 turbos. They are insanely responsive. Spool characteristics and transient response are a different subject. Both will spool really close, but the GT28 will feel more lively all around.

[mrharry]

Originally Posted by Coheed

Gtx3076r is a decent turbo, but adding more flow to a (IMHO) mismatch turbo is going in the opp direction of what I would find ideal. The GTX3576r is a better option going that big. The GTX2867 is a pretty awesome turbo. Very well balanced, and will perform well on the street and track. But... the GTX3576r is much larger... and you can't really go too big, can you?

The big power nut in me wants to see the larger turbo in use, but transient response in that size will be nothing compared the GTX28 turbos. They are insanely responsive. Spool characteristics and transient response are a different subject. Both will spool really close, but the GT28 will feel more lively all around.

how far apart does gtx28 and gtx30 hit boost?

[Coheed]

Originally Posted by mrharry

how far apart does gtx28 and gtx30 hit boost?

Couple hundred rpm. But there are other factors that will dictate when they hit boost. Generally the GTX28 is 2-400rpm sooner. I used a GT3076r twinscroll with an air/water intercooler and open downpipe to achieve spool very similar to the GT2860rs. Just a tiny bit slower to spool. But considering the extra work needed to get there, if you really want spool just stick to the smaller turbo. Not everyone wants to run without an exhaust, and not everyone can get away with 3' max of intercooler piping.

On the street, the GT3076r was pretty forgivable as far as lag goes. But the GT28 turbos will spool faster, and the dyno chart may not always show the true character on the street. I'm not a big advocate of the 2871r though. The gtx2867r is on a completely different level. Next to the original Disco Potato, I've not found a turbo that comes close for responsiveness/power. The 2871r has always been "meh" to me, as I've used it in many applications and none of them really wowed me. I'd stick to the GT3071r over the 2871r, but that's me.

[dabocx]

Im at 380whp 300tq with the gtx2867 at 15 psi, part of me wants to pump up to the gtx3076 since long term i want a built bottom end and cams.

But another part says to just get a turboback and see how far the gtx28 can go for now.

[Sportsguy83]

GTX3076R/end of story.

I have it in my car with great results, 550 whp @ 19 psi.
@jamesm (best tuner out there in other words) is upgrading his 2867 to a 3076r as we speak.

/end thread.

[dabocx]

Originally Posted by Sportsguy83

GTX3076R/end of story.

I have it in my car with great results, 550 whp @ 19 psi.
@jamesm (best tuner out there in other words) is upgrading his 2867 to a 3076r as we speak.

/end thread.

Whats your fuel setup? Im thinking of getting the 485 pump and 1000cc injectors, I dont know if thats enough for e85

[Sportsguy83]

Originally Posted by dabocx

Whats your fuel setup? Im thinking of getting the 485 pump and 1000cc injectors, I dont know if thats enough for e85

Exactly that. 485 pump and ID1000s

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[dabocx]

Originally Posted by Sportsguy83

Exactly that. 485 pump and ID1000s

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Is there still room to do more?

I might just go your route and do a built motor later

[mrharry]

Originally Posted by Sportsguy83

GTX3076R/end of story.

I have it in my car with great results, 550 whp @ 19 psi.
@jamesm (best tuner out there in other words) is upgrading his 2867 to a 3076r as we speak.

/end thread.

What rpm do the boost starts kicking in for you? As I don't want to be entering a corner and getting lag while exiting

[Black86]

Gtx3076r will destroy cars on the street I'm prob going to do that turbo instead of the gtx28 when I go boost. I want to be in modified vette territory. I'm sure the gtx28 can too a 2800lb 450-550whp car is pretty scary

[Sportsguy83]

Originally Posted by mrharry

What rpm do the boost starts kicking in for you? As I don't want to be entering a corner and getting lag while exiting

Starts at right around 3k and full boost 12 psi about 4.2k.

For higher boost like 19 psi full boost is around 4.5k


I needed to add my back housing is .82 so a .63 would spool a bit faster.

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