Stopsign32v

iTrader: (1)

If so what are the characteristics of the turbos? I've read through searching go with the 3071 over the 2871 because they basically spool the same. And then I've also read to go with the 3076 over the 3071 because spool is the same. It seems to be an understandable yet constant trail of "go just a touch bigger because its basically the same". So you go from a GT28 to a GT3076 and from what you read it's basically the same.

So has anyone actually owned or ridden in these and can give first hand experience and opinion on how they react such as spool time and recovery?

Geis

Everyone and their brother runs gt30s, they're very common and spool very quickly. The gt28 will spool faster, probably not by very much and will sacrifice some power.
If you think you'll be more power hungry get the gt30, but both have good resale values if you would ever like upgrading.

Dark_Teg

I have also seen that the GT3582R spools about the same as a GT3076R but recovers slower between shifts. I liked the GT3076R and I hope I like it even better with the TR3030R upgrade.

LightningTeg

See Tony The Tigers video of his Integra rocking a GT28(71?) R. Then go find a video of a GT3076r car. The response from a GT28r is almost instant. There is a noticeable difference.

There is tons of videos and data to go on these days. Should be easy to decide.

https://honda-tech.com/forced-induct...t2871-1848243/

LightningTeg

Another 30R car. 10psi compared to GT28R graph above, about 1000 rpm spool difference. And that's on paper. On the street the transient response is obviously going to be much different as well.

Stopsign32v

iTrader: (1)

Lightning are you talking about the GT28rs or the GT2871r? Because from what I've read there is a difference in spool time between the two. Someone even mentioned Tony said there was a bit of difference. And I'm not interested in the GT2860rs at the moment. Give it a couple days and I could be. lol But no seriously, I'd at LEAST like a turbo that can support close to 400whp and hopefully 450whp (which I know the 2871 can't)

Stopsign32v

iTrader: (1)

GTX3067R, interesting

but then there is this

So a 4201whp GTX2867R followed with this description of it...

And then there is a video of it being said these are good to about 350whp. So how does one get 421whp? I understand how well the motor flows will determine the amount of power per lb but I thought a turbo was maxed out at XXX no matter what?

Stopsign32v

iTrader: (1)

I guess what I'm ultimately looking for is the most responsive 450whp/max turbo out there that would be good for the street.

I know the 2871 will never get there, I just keep holding onto it because of the response it seems to hold over the rest.

The 3071r would make it to 450 or at least close and the 3076r would. But both would hold more lag over the 2871. I want 3076r power with 2871r spool.

I guess that's a better way to put it, maybe?


https://honda-tech.com/forced-induct.../#post50245679

A great read around #63+

What I want to avoid is 150whp....160whp.....162whp....165rwhp........370whp.......390whp

AKA I don't want that instant surge of 200whp that will do nothing but blow the tires off. (what causes this anyways?)

Stopsign32v

iTrader: (1)

I have no idea if this is relevant or not but it is a 1.8L and you can see the responsiveness of the 3071r although he isn't the fastest of shifters by a long shot.

LightningTeg

On paper it seems that way. My 28R made 300 ft-lbs by 4000 rpm and it was by no means blowing the tires off the way my SC6152E did once it got into power. Not to mention the response of the turbo goes along way with being able to modulate it with the throttle to achieve the 'smoothness' you want.

This was my GT2560R so quite a bit shy of 450whp capable (300whp maxxed)



The GT/X3071R sounds like the best off the shelf unit for your goals. Or something more custom (like an STC unit).

Stopsign32v

iTrader: (1)

Man I can't tell you how many times I've watched each of your videos. Nothing I haven't seen, that's for sure. I agree with you, I keep going back to the GT3071R. I think I will speak with STC about anything custom that would be better but I want to stick to around $1300 otd ready to go on.

Anyone with any other options feel free to step in. My ultimate plan:

Geis

Uhm, cool?
Once again, just like on the transmission thread, you act like your proving me wrong about something when you aren't. Ok, it spools a decent amount quicker, does that somehow remove the gt30's credibility as a recommendation that gives a bit more headroom and still very fast response /low boost threshold? No, it does not, don't even attempt to tell me it does in any way. Furthermore, unless there's another I'm unaware of, Tony runs a gt30on his Integra. I mean seriously man, it's just funny/ironic at this point

Eat a snickers or something 👈

Stopsign32v

iTrader: (1)

I really don't think he was being aggressive towards you with his post. He was just pointing out stuff.

LightningTeg

You need the snickers...



That was all for stopsign dont worry.

But you did say
Having owned one I can tell you thats not that case lol.

Geis

Unless you kept it a secret, you haven't owned a gt287x. It's all relative anyways, **** you even used Tony's build as an example when he's using a gt30 himself.

Anyways, why get one of those when you cam pump out '470whp' out of a 57 trim, remember?
Heard those come in ball bearing as well if you're concerned with transient response 👉

LightningTeg

I had what was known as a GT28r. Ball bearing t28 essentially. But same family. Not really sure what the harping about tony is about. Last I checked he is running a gt3582r but the build I know him for was using a GT2871r.

http://youtu.be/xcxmLtQOV2U

Stopsign32v

iTrader: (1)

Geis

A 350 hp turbo is a lot different than a 480(ish) hp turbo. But hey, I'll pretend it's the same for you
Honestly you might as well have gave him this for his turbo choice : Just Flip A Coin

Stopsign32v

iTrader: (1)

More info found while searching worth mentioning

Geis

I mean, since you are searching for just the craziest spool along with gt30 power (which already gives you crazy spool) then why not look at twin scroll options? I'm not particularly knowledgeable on them since nobody here in the honda game really used them all too often, but I believe to have seen evo 9 turbos get pushed to around 450whp.

Tony the Tiger

There is quite a number of ways to define spool, and usually I'll try to avoid mixing them up between response / spool / recovery conditions. What you see on a dyno chart is just spool up in relation to RPM without using "time" as a major factor.

the GT28 based turbos spool up from low RPM very quickly and requires almost no lead time to spool up. I would classify the spool up to be like any stock turbo car, of not, better.

When guys point out that a GT30R spools almost the same, they are indeed correct. If you load up a GT30R turbo in an dyno pull condition starting from a low RPM, they both spool up very similarly. The lag difference is actually a difference in response, or how quickly the turbo flashes up into power at any RPM within the spool range.

Unless your car is a full size Civic sedan / Accord or something heavier than your typical hatch, the lag is really not noticeable between the two. Circuit racers tend to prefer the GT28 turbo due to better resolution of power (i.e. greater control over power with a smaller turbine). The GT30R will be more snappy and has less resolution for controlling power with your throttle. It moves towards being an on/off switch at higher RPM's.

On a street car, your power goal will determine what size turbo to choose. If you are looking for 400WHP or more, then your choice will automatically have to be a GT3071R.

I would only choose a GT3076R if you have plans to go up to to 450WHP and plan on staying with pump gas (not E85). The larger compressor will help the knock limit on a given fuel.

I have had all the turbos mentioned above, including the GTX variants on the same car. I would consider a divided scroll GTX3071R to be complete overkill already in terms of spool. I can almost never use the powerband unless I was literally two gears "in the wrong gear" -- as if I was supposed to be in 2nd gear, but I was in 4th gear -- way too much powerband for a FWD car that can rev to 9000+ RPM. I would be totally happy with an open scroll GT3071R (or flow equivalent GTX3067R) or a GT3076R (or flow equivalent GTX3071R)

Tony the Tiger

Gonna have to side with the oldschool members though... Only the OG's like LightningTeg remembered the course of my builds over the years. I had a GT28RS in 2002-03, a GT2871R in '04-07, then had a T67 for '08, a GT4088R for '09-11, then had a GTX3582R for '12-14, then had a GTX3076R for '15, then had a GTX3071R just back in Oct '15.. Umm.. yeah

Just check my last post for my opinions regarding the different turbos (plus I gotta update my sig, it's outdated again...lol)

TheShodan

iTrader: (14)

^^^^

Now, even though I promised to Stopsign32v that I won't say anything anymore in his threads, for the rest of those interested in this theory for the forum, there's one more (actually two, but I'll stick to the point) that can come close to what Stopsign32V is looking for. Tony gave a subtle hint to it already. *hint* on the border between the GTX28 and GTX30 families.

But, he wants to learn as much as he can in a polite and in a manner which gives the atmosphere of good "kumbya", so that he can search for answers from others in peace.... So,for now...

LightningTeg

There is also the GT/X2876R and the GT/X2967R

Dark_Teg

TR3030R FTW