GT3071 vs 3076 vote

[cam1391]

So heres the deal. Getting ready to order one of tge two (gt3071 or gt3076). My ultimate whp goal is 450-475, I have no intention of ever going over 500. Ive gotten alot of suggestions both ways so ill put it to a vote. Ill start with the iwg setup for the time being, later on once the internals are built switching to the cpe ewg manifold with oem flange looping the wastegate back into the dp and welding the iwg shut. I dont mind slightly later spool as wanting full boost at 3k is just asking for disaster. Keep in mind this will be daily driven. Thanks in advance.
P.s. if you think I ought to just buy the ewg atp hotside let me know

[sheston]

I think you should go GTX....R

The GTX3071R is supposed to flow about like the 76

[WetzMS3]

I think you should read more and make your own decision. there is plenty of information about the difference/similarities between the two.

[SpeedRebirth]

You said it yourself, you don't mind later spool. Which means you should go bigger. I also recommend going with the gtx model since it flows much more than the gt without hurting spooltime.

GTX2867 ~ GT3071
GTX3071 ~ GT3076
GTX3076 ~ GT35XX

GTX3076 sounds like the perfect turbo for you. It also doesn't suffer from the boost creep issue that the gtx3071 iwg does. And as always, ewg is the way to go! :-)

[cam1391]

Originally Posted by SpeedRebirth You said it yourself, you don't mind later spool. Which means you should go bigger. I also recommend going with the gtx model since it flows much more than the gt without hurting spooltime. GTX2867 ~ GT3071 GTX3071 ~ GT3076 GTX3076 ~ GT35XX GTX3076 sounds like the perfect turbo for you. It also doesn't suffer from the boost creep issue that the gtx3071 iwg does. And as always, ewg is the way to go! :-)

Thanks man, that actually just solidified my decision.

Originally Posted by mxlplx71 Buy rods and pistons, first.

Lol I will, dont plan on trying to pass 4 without them. Its feels strange building the bottom end. Ive been spoiled with the 4g63 in my old evo9 taking a whopping 550 on the stock block.

[mxlplx71]

Buy rods and pistons, first.

[cam1391]

FP HTA gt3076r w/ atp ewg housing

[Nel Mazdaspeed]

Originally Posted by cam1391 FP HTA gt3076r w/ atp ewg housing

Those sound nice and LOUD

[mr.speedy3]

I love my GTX3076r... got me 500hp without much of a problem on 91+meth@28psi; with no tapper.

Have another local with a GTX3071, but he ha to tapper from 27psi to 24psi by redline due to the top end not being the same. He still made roughly 475hp I believe.

I will say, that, 28 psi all the to redline is a hell of a ride.

[cam1391]

Originally Posted by mr.speedy3 I love my GTX3076r... got me 500hp without much of a problem on 91+meth@28psi; with no tapper. Have another local with a GTX3071, but he ha to tapper from 27psi to 24psi by redline due to the top end not being the same. He still made roughly 475hp I believe. I will say, that, 28 psi all the to redline is a hell of a ride.

Gtx 3076r it is! No creep and better flow. Easier on the stock block is just a plus
Now the question is whether to go iwg, or ewg looped into the downpipe. I have a little girl and cant have the screamer pipe killing her hearing. Probably gonna go ewg with the cs downpipe since the wg and turbine outlet are seperated. Would make it easy to cut the iwg pipe, weld it shut, and mate the ewg screamer pipe to the existing wastegate recirc tube. Id fabricate in an electronic cut out to the screamer pipe so I can be obnoxious when the little one isnt in the car with me.

[mr.speedy3]

Originally Posted by cam1391 Gtx 3076r it is! No creep and better flow. Easier on the stock block is just a plus Now the question is whether to go iwg, or ewg looped into the downpipe. I have a little girl and cant have the screamer pipe killing her hearing. Probably gonna go ewg with the cs downpipe since the wg and turbine outlet are seperated. Would make it easy to cut the iwg pipe, weld it shut, and mate the ewg screamer pipe to the existing wastegate recirc tube. Id fabricate in an electronic cut out to the screamer pipe so I can be obnoxious when the little one isnt in the car with me.

I should mention... I have forged internals... Lol. I went iwg and ported the housing... Was extremely easy. I've had 0 boost creep in the 13k miles i currently have. There is a thread I'll link to later showing my port job with some hints. It was something I've never done before, or anything of the sort... Stupid simple.

tapatalkin

[cam1391]

Originally Posted by mr.speedy3 I should mention... I have forged internals... Lol. I went iwg and ported the housing... Was extremely easy. I've had 0 boost creep in the 13k miles i currently have. There is a thread I'll link to later showing my port job with some hints. It was something I've never done before, or anything of the sort... Stupid simple. tapatalkin

So I take it your vote is for iwg. Would you still go iwg if you did it all again?

[mr.speedy3]

Originally Posted by cam1391 So I take it your vote is for iwg. Would you still go iwg if you did it all again?

Link for reference
http://www.mazdaspeedforum.org/forum/foru....php?p=2536662

I would go iwg again, I have 0 issues, and hit boost no problem.

tapatalkin

[cam1391]

Originally Posted by mr.speedy3 I love my GTX3076r... got me 500hp without much of a problem on 91+meth@28psi; with no tapper. Have another local with a GTX3071, but he ha to tapper from 27psi to 24psi by redline due to the top end not being the same. He still made roughly 475hp I believe. I will say, that, 28 psi all the to redline is a hell of a ride.

What meth kit are you running? Ive been trying to get ahold of snow, but to no avail.. e85 is a long drive for me, and ive had phenomenal resupts with meth before. 497awhp, 512awtq @ 34psi in my old evo with a fp red.

[BlackFlag]

This will be a great thread for people searching!

[SpeedRebirth]

EWG ftw, it's also easier for the tuners to control an EWG. And if the wastegate is mounted on the manifold like it is on the cpe, it will have more power potential because not all the gases have to go through the turbo housing. What makes power is flow and low resistance

[cam1391]

Originally Posted by SpeedRebirth EWG ftw, it's also easier for the tuners to control an EWG. And if the wastegate is mounted on the manifold like it is on the cpe, it will have more power potential because not all the gases have to go through the turbo housing. What makes power is flow and low resistance

So heres the plan. Gonna go gtx3076r iwg to get to my 375- 400hp mark, then when I build the bottom end ill upgrade to cpe's 44mm ewg manifold and tac the iwg flapper shut.

[hatchedspeed3]

good luck with your build. keep us updated

[Jeff23spl]

imo you will need to bypass more exaust gaz to limit it below 400 so WG need to be larger at that time than later when you want more...

BTW Boost creep isn't just the turbo, it depend of exaust piping and temperature/pressure in your area. Up north it's even a concern with 2871 non catted but you probably don't see often below 0F?
If you have some issues, you may restric the exaust it will give it later but it will be better for your stock internals while reducing creep tendency of IWG. Then you can unleash it once being built with EWG trying to make it spool as soon as possible while the ewg will take control when it is going to creep.
What is the spool response difference between a GTX3076 VS 3071 ? Sometimes i think about changing it too.
Maybe the little more lag will just make the engine last longer with power at higher rpm...

[mr.speedy3]

Originally Posted by Jeff23spl imo you will need to bypass more exaust gaz to limit it below 400 so WG need to be larger at that time than later when you want more... BTW Boost creep isn't just the turbo, it depend of exaust piping and temperature/pressure in your area. Up north it's even a concern with 2871 non catted but you probably don't see often below 0F? If you have some issues, you may restric the exaust it will give it later but it will be better for your stock internals while reducing creep tendency of IWG. Then you can unleash it once being built with EWG trying to make it spool as soon as possible while the ewg will take control when it is going to creep. What is the spool response difference between a GTX3076 VS 3071 ? Sometimes i think about changing it too. Maybe the little more lag will just make the engine last longer with power at higher rpm...

Good info... Best comparison I can give you:
@Matrix311 is local to me and runs a 3071 on basically the same engine build as me (built block, 91+meth, turbo with iwg). We compared logs once upon a time, the spool was basically the same. 20psi at the same time. Full boost at the same time basically. Nothing a normal person could feel the difference with. We also have the same tuner, and that definitely plays a role. Difference is, he tapers boost and I do not. I am 28psi till redline lol.



tapatalkin

[cam1391]

Originally Posted by Jeff23spl imo you will need to bypass more exaust gaz to limit it below 400 so WG need to be larger at that time than later when you want more... BTW Boost creep isn't just the turbo, it depend of exaust piping and temperature/pressure in your area. Up north it's even a concern with 2871 non catted but you probably don't see often below 0F? If you have some issues, you may restric the exaust it will give it later but it will be better for your stock internals while reducing creep tendency of IWG. Then you can unleash it once being built with EWG trying to make it spool as soon as possible while the ewg will take control when it is going to creep. What is the spool response difference between a GTX3076 VS 3071 ? Sometimes i think about changing it too. Maybe the little more lag will just make the engine last longer with power at higher rpm...

So should I go atp ewg, then plate off the atp housing once I get the extra GRAND tue get the cpe manifold? Or.will porting the shit out of the iwg be sufficient till I get the cpe mani? Ive heard people juust porting iwg's ang running safe levels witthout creep or peaking. I wish atp would just offer a 44mm ewg turbine the housing. I may try to get them to custome cast one.. probably a futile attempt tho. Should I really just hold.off another year so I can get the cpe mani and iwg (welded shut) at same time? Seems like.alot of people are running iwg with no prob. I will be reinstalling my oem downpipe once I go big turbo till I build the engine.

[hatchedspeed3]

Originally Posted by cam1391 So should I go atp ewg, then plate off the atp housing once I get the extra GRAND tue get the cpe manifold? Or.will porting the shit out of the iwg be sufficient till I get the cpe mani? Ive heard people juust porting iwg's ang running safe levels witthout creep or peaking. I wish atp would just offer a 44mm ewg turbine the housing. I may try to get them to custome cast one.. probably a futile attempt tho. Should I really just hold.off another year so I can get the cpe mani and iwg (welded shut) at same time? Seems like.alot of people are running iwg with no prob. I will be reinstalling my oem downpipe once I go big turbo till I build the engine.

since you are in the sunshine state, colder temperatures (which fuck with boost creep), wont affect you as much. Ive always been a fan of EWG (becuase fuck boost creep), and an aftermarket Em will definately flow better. In the end, its what you want and what you want to spend. There is nothing wrong with IWG on a good tune (although I'd highly encourage you to look at a guardian angel). Dont spend the money if you dont have to, but dont skimp. Also, CP-E isnt your only manifold option. There is a thread on here (recent) that compares the interior diameters of the manifolds, flow, etc. Might be worth looking into. as far as welding the IWG shut, you can always just buy a bracket to clamp it off, or even port it a bit. As stated before, EWG is a lot easier for a tuner to control (sounds better too). With all of this stupid shit being said, there is a stackable sale thru @RPM; for CP-E products. You can get the mani for $732.xx (I priced it yesterday), so again, its all up to you, and what you want to do. Either way, Im sure itll be a solid build, and I hope to run into you when I move back in a few months. good luck with the build, hope this helped a little bit...rant complete....lolz

[Jeff23spl]

Originally Posted by cam1391 So should I go atp ewg, then plate off the atp housing once I get the extra GRAND tue get the cpe manifold? Or.will porting the shit out of the iwg be sufficient till I get the cpe mani? Ive heard people juust porting iwg's ang running safe levels witthout creep or peaking. I wish atp would just offer a 44mm ewg turbine the housing. I may try to get them to custome cast one.. probably a futile attempt tho. Should I really just hold.off another year so I can get the cpe mani and iwg (welded shut) at same time? Seems like.alot of people are running iwg with no prob. I will be reinstalling my oem downpipe once I go big turbo till I build the engine.

spending extra money for a temporary solution isn't worth it. If you have a catted downpipe, leave in hot weather and you port the IWG it can't be that worst.

My own issue up north with the gt2871 is really during winter or when i try to make it spool too low in rpm. At worst you may have more work with the tune.
IMo if you gonna build the bloc for sure i would go 76mm right at first.

[SpencerC]

Meh. Go 35 or go home. jk.

[hatchedspeed3]

Originally Posted by Spencer@CorkSport Meh. Go 35 or go home. jk.

6466 on your miata..no balls....lol jkjk

[hatchedspeed3]

^^^this. Build it one time. Go for the end result.

[Matrix311]

I haven't had any issues with my gtx3017r IWG. I ported it and its been perfectly fine. I've had it installed for over 3yrs and a good 40k miles on it and the turbo is still kicking just fine.