Garrett BB Turbo

[BoostFrenzy]

*NOTICE: I have the full arsonal of supporting mods for these turbos and if I don't (255+AFPR and probably a different FMIC and clutch) then I will by the time I order one of these. This thread is serious. I have the means to do either one so this is no pipe dream. If you don't believe me, check my current mod list and tell me if I am serious or not.*

Okay. Well my question pertains to 2 Garrett ball bearing turbos. The reasoning is because they are priced fairly close to each other. They are:
-GT3071R ~440hp Rated
-GT3076R ~520hp Rated

This vehicle will be used as a DD/Road race car. Now on my current setup, I have a GT2871R that has a mitsu hotside on it that I had bought from a friend. I am looking into these 2 turbos because I'd rather run something new then something that has seen better days.

The questions: Right now, the GT3071R is probably the best choice for me because it is just slighty larger. But for not much more and that much more potential, I am wondering what the difference of spool up would be between the two. Right now, my block is bone stock. I am going to be purchasing a set of FP cams along with the turbo so I can get the full potential of either of these 2 turbos top end power. But I am going to be prepping a spare engine for an all out 2.0L build up (that will probably see 8.5-9K when pushed) to support anything I can throw at it.

So to sum up. On a stock block, around where should I expect spool up for both?
And as well, where should I expect spool up on a fully built 2.0L engine with a CR of 8.3:1.

Thank you for any answers.

 

[T9S1i]

*NOTICE: I have the full arsonal of supporting mods for these turbos and if I don't (255+AFPR and probably a different FMIC and clutch) then I will by the time I order one of these. This thread is serious. I have the means to do either one so this is no pipe dream. If you don't believe me, check my current mod list and tell me if I am serious or not.*

Okay. Well my question pertains to 2 Garrett ball bearing turbos. The reasoning is because they are priced fairly close to each other. They are:
-GT3071R ~440hp Rated
-GT3076R ~520hp Rated

This vehicle will be used as a DD/Road race car. Now on my current setup, I have a GT2871R that has a mitsu hotside on it that I had bought from a friend. I am looking into these 2 turbos because I'd rather run something new then something that has seen better days.

The questions: Right now, the GT3071R is probably the best choice for me because it is just slighty larger. But for not much more and that much more potential, I am wondering what the difference of spool up would be between the two. Right now, my block is bone stock. I am going to be purchasing a set of FP cams along with the turbo so I can get the full potential of either of these 2 turbos top end power. But I am going to be prepping a spare engine for an all out 2.0L build up (that will probably see 8.5-9K when pushed) to support anything I can throw at it.

So to sum up. On a stock block, around where should I expect spool up for both?
And as well, where should I expect spool up on a fully built 2.0L engine with a CR of 8.3:1.

Thank you for any answers.

You mean slightly smaller.



I would personally go with the 3076 out of the two choices there. It is the gt 30r, there is PLENTY of info on this turbo on this site as to power potential, spool times, etc etc. The 3071 is less popular, so probably not as much info on the site as the 3076.

Are you going to run t3 or bolt on?

I currently run a borg warner s258 with t3 .70 turbing housing, i'm aiming for more dd and drag racing. If i were to have your goals i would go with the borg warner s256 probably with a bolt on.

 

[BoostFrenzy]

You mean slightly smaller.

The 3071 is less popular, so probably not as much info on the site as the 3076.

Are you going to run t3 or bolt on?

I currently run a borg warner s258 with t3 .70 turbing housing, i'm aiming for more dd and drag racing. If i were to have your goals i would go with the borg warner s256 probably with a bolt on.

Slightly larger then my existing turbo. Sorry about the lack of clarification there.

Yeah, there is not much to find on the 3071 turbo at all. Most of what I can find is the 3076.

I have not heard too much of BW turbos in road racing. I know that a lot of the drag guys use them. But in road racing, spool up smoothness is important. I'll leave this thread open to see if anyone else has any input or experience with these turbos.

Thank you T9S1i for the suggestions.

 

[Rob10_99]

Those HP numbers are race gas, and spool on the 30r is a bit smoother to come on than the 35r.
I would say 30r for a street car and 35r for your racegas/weekend car. They are both great turbos, thats the reason they are so popular.
For your roadracing I would go 30r, or even an FP variant. How fast is this thing going on the track with 500hp? damn.

 

[BoostFrenzy]

Those HP numbers are race gas, and spool on the 30r is a bit smoother to come on than the 35r.
I would say 30r for a street car and 35r for your racegas/weekend car. They are both great turbos, thats the reason they are so popular.
For your roadracing I would go 30r, or even an FP variant. How fast is this thing going on the track with 500hp? damn.

Yeah, I know there is no way in hell I could get those numbers on poor piss 91 even with a NICE amount of meth. I plan on staying bolt on with the mitsu exhaust side. I would love to go with a GT3076HTA but that requires me to change most of my existing setup. Same with the FP3052. Requires too much that I already have for a different setup. I know the mitsu hot side does not flow as well as a T3 but it simplifies things.

And about the 500hp remark, we like to go fast in these parts

 

[BoostFrenzy]

Well, after tons of reading from across the world of DSM boards, I have decided on the 3076R because the 3071 is really not worth the change. Now it is just down to the options that are available to me.

So with a PTE GT3076R:
*.48 or .63 A/R on a 3" Inlet 2" outlet Here
*OR unknown A/R with a 4" Inlet 2" outlet (probably the .63) Here

So now this question:
1) Is there a big difference between performance and efficiency on this turbo for the different inlet size?

Thank you guys for the help so far

 

[Rob10_99]

The S shroud will have a wider map, which would be better for your roadracing if you get into surge, which I expect you to at lower rpm and WOT in the curves.
Or part throttle boosting trying to pedal out of the corners .
Go with the ported shroud for sure,

 

[T9S1i]

I would definitely go with the 4" inlet. Im sure you can ask extremepsi for the 4" sp cover and they can do it for you.

In terms of the exhaust housing a/r, it all has to do with where the power curve will be.
the .48 will spool faster and give good usable power probably to 7k
the .63 will spool a little later, but give usable power up to 8k

Obviously the .63 is more popular with the drag racers because they love to live up in high rpms, and the .48 would be more popular with the road racers so that you can get your power faster and what not out of a turn. I guess you can always change your driving habits to be up in the higher rpms more often, but i think it all depends on the rest of your setup. Is your motor/head/intake manifold stock? If so i would go with the .48, if you have a forged bottom end, balanced, upgraded springs, cams, SMIM, then i would go with the .63 as you can rev to the moon.

So all in all, i would go for the 4"inlet sp cover, and then figure out where you want your power according to your motor setup and driving style and then pick your turbine housing accodringly.

Good luck and happy boosting!

 

[BoostFrenzy]

Alright, just finished ordering my new turbo. It is the PTE GT3076RLE with the T04SP intake with a .48A/R for the exhaust. Was considering the .63, but then decided that there are a few hills over here that would not mix to well with my current engine setup. There's always new technology coming out anyway so when I am ready, I'm sure the market will be too.

Only bad news I received was that currently, the turbo is on back order through PTE because they are out of the CHRA right now. So it could take a bit to actually receive it.

So thank you gentlemen for the words of wisdom. They are greatly appreciated

 

[T9S1i]

that .48 will make it a quick spooling hard hitting turbo!

Good luck with the new turbo, you should be happy! Post up pics when you get it.

 

[BoostFrenzy]

that .48 will make it a quick spooling hard hitting turbo!

Good luck with the new turbo, you should be happy! Post up pics when you get it.

For sure. This thing will be so dang...big haha. I will definitely take pictures of it for you all to see.

 

[BoostFrenzy]

It finally came in today. I'm pretty happy.

Picture time:

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I will do another major update on performance once I get it all tuned in. So uh....stay tuned .

 

[DougR]

nice! The wastegate passage is congrats!

 

[Boosted98gsx]

What's the A/R of that turbine housing? If it's much smaller than .60, you're likely to choke off flow up top, and get surge down low.

Interesting though that PTE has designed a new mitsu-garrett turbine housing that's big enough to accept the GT30 turbine.

 

[TSIMonsteR]

What's the A/R of that turbine housing? If it's much smaller than .60, you're likely to choke off flow up top, and get surge down low.

Interesting though that PTE has designed a new mitsu-garrett turbine housing that's big enough to accept the GT30 turbine.

PTE has offered bolt-on GT30s for a long time now. Even in the bolt-on 35R flavor. With an anti-surge comp housing, hopefully it won't be a problem down low.

 

[Boosted98gsx]

PTE has offered bolt-on GT30s for a long time now. Even in the bolt-on 35R flavor. With an anti-surge comp housing, hopefully it won't be a problem down low.

Yes, but they used their surge ported S cover which is known for not helping defer surging air (air being forced out 1 direction of drilled holes from a spinning compressor wheel = lots of backpressure). This is truly the first true garrett compressor housing mounted on a PTE turbo I have seen. Still, that turbine housing, being "Mitsu" will probably neck off flow, but you will more than likely not be running it at the boost levels to see it. Enjoy the turbocharger, and MAKE SURE to run coolant to that CHRA.

 

[BoostFrenzy]

What's the A/R of that turbine housing? If it's much smaller than .60, you're likely to choke off flow up top, and get surge down low.

It is the smaller .48 A/R. And I know it will choke up a bit on top. I need this turbo to be very streetable with a nice fat mid range. The surge is the reason for the TO4SP housing.

Yes, but they used their surge ported S cover which is known for not helping defer surging air (air being forced out 1 direction of drilled holes from a spinning compressor wheel = lots of backpressure). This is truly the first true garrett compressor housing mounted on a PTE turbo I have seen. Still, that turbine housing, being "Mitsu" will probably neck off flow, but you will more than likely not be running it at the boost levels to see it. Enjoy the turbocharger, and MAKE SURE to run coolant to that CHRA.

You are VERY right. I was actually expecting to get the "gun hole" cover and knew it wouldn't be too great but it would help a little. When I saw the "Garrett" stamped on the cover I thought they had sent the wrong turbo. So it was a pleasant surprise when I saw that it had the right exhaust side.

For a while, I was REALLY considering going T3 with FP's GT30HTA because of it's flow and spool capabilities but decided to ride this one out and see where it gets me. I am hoping that it brings me what I need at the moment. With time, I'll move on to a full T3 setup.

"Not be running it at the boost levels to see"...well yeah. Poor piss 91 here. And I don't have any plans for meth because it is too much of a hassle on the track if it goes wrong and sloshing play a big factor in my choice. I'd rather put out for race gas then have to deal with those. Plans for tuning: a Pump 91 tune, Pump 100, and then a full out race gas tune. I am sure, with a set of 272's I'll be seeing hints of where it starts to die off. I will be upping boost with each tune, but I want to focus on tq the most so good timing numbers are important.

As for coolant, I already have some new nicely curved 2g water lines on there to get it all done properly. I'll snap a few of those too. I've been wanting to do a full stainless setup for it but I guess that can come along another day.

Thanks for your responses gents.

 

[eder-loco]

i <3 my dbb 35r, its about to be my best friend on highway rolls.
But good luck on ## choice.

 

[Boosted98gsx]

Well the T04S housings were .70 A/R on the compressor side, I think that's the T04E surge port housing.

 

[TSIMonsteR]

Yes, but they used their surge ported S cover which is known for not helping defer surging air (air being forced out 1 direction of drilled holes from a spinning compressor wheel = lots of backpressure). This is truly the first true garrett compressor housing mounted on a PTE turbo I have seen. Still, that turbine housing, being "Mitsu" will probably neck off flow, but you will more than likely not be running it at the boost levels to see it. Enjoy the turbocharger, and MAKE SURE to run coolant to that CHRA.

I see what you mean. My mistake.

 

[BoostFrenzy]

Well the T04S housings were .70 A/R on the compressor side, I think that's the T04E surge port housing.

I think you may be right. If I remember correctly, the S and the SP covers both have a 2.5" outlet and this one is only a 2".

 

[DSMSpyder99]

is it on yet King Naco?

 

[BoostFrenzy]

is it on yet King Naco?

Not yet. Taking off the old turbo setup tomorrow (well, today actually) and starting the parts swap. From there, I'm just waiting on the manifold to come in to Road Race. So sometime tomorrow I will have pictures up with the punishment o2 housing on it.

Reason it's taking me so long is because I am doing everything new from the head down. New exhaust manifold studs, new Evo3 manifold, new turbo bolts, new turbo, new Punishment o2 housing connected with new ARP o2 bolts and then a new RRE DP to work with the o2 housing. That's a lot of new...haha

 

[BoostFrenzy]

I finally got around to getting the car running a decent boost pressure. Had some problems with the wastegate and a bunch of other stuff (valve stem seals). But it's all sorted out now. At about 19PSI I am getting around 35lbs/min on 91 octane (possibly more now, need to do another log). It spools up fast enough for me to be satisfied but not 16g annoying fast.

I've also done some testing for surge. Not a damn hint of it. 5th gear, on the freeway @ 2k and I go WOT and let it build up to 15PSI and nothing. This comp cover is magical .

Will post a log from my tuning laptop later. Possibly after I get the time to hook up my Greddy52 as my logged boost pressure.