issues with gt3076

[techghost]

I just ended up installing a gt3076-13 with a 1.06 are turbine housing, my current issue is that the turbo is spooling at around 4/4.5k rpm but even though I have a 1.5bar spring in my WG I don't reach full boost in first and second gear. Haven't tried the 3rd gear yet, boost also builds up slowly (nothing as fast as a bb turbo or my old 16g big). I have checked for boost leaks multiple times but there aren't any at all.
Does anyone has any idea on what the issue is?
Need help asap.

 

[1gDSM4g63]

Didn't you have another forum up about this last week? Anyhow, you should have stay with your big 16g or gone with a gt3070R. The gt3076 that you have is first off only single ball bearing and second housing is much too large. Bigger in size don't always benefit you.

 

[BoostFrenzy]

You just have a big A/R on it. It decreases spool times but makes sure it gets maximum flow. What RPM is your redline? Try getting a smaller hotside on it and it will for sure wake up. Also, check for pre-turbo exhaust leaks as that can both slow spool time and cause decreased performance up top.

Try it with the -14 (instead of the -13) housing as that has the same V-band discharge as yours and will be an easy swap with little to no modification required. If you want even faster spool up, the -15 housing will suite you better. Probably the best all around choice unless the car is strictly for drag racing.

 

[techghost]

sourcing out another housing will be a problem as we don't have many performance shops here and have to order which takes quite long.
Actually its a dual bb turbo gt3076r I forgot to mention R
my 16g big maxed out at 22+psi, so I went for 30r and got it for real cheap from a friend with this housing so I didn't had any option on housing.

Where can I get a housing for my gt3076r from?

Also are these the symptoms of large housing? Has anyone ever tried this big housing on their dsm?

 

[1gDSM4g63]

People have ran bigger a/r housing even I'm running a bigger housing, which spools about 20 psi at 4400-4500 rpm but it's capable of making up to 800-900 hp. However a gt30r compressor is way to small for 1.06 a/r housing. It defies all the advantages of a gt30r on a DSM. Even people with a gt35r have smaller housing than your.

 

[techghost]

@1gdsm4g63
dude! which turbo are u running? and with which housing?

Do u think the issue i have is because of bigger housing>??

 

[1gDSM4g63]

I'm running a Holset HX-52 16cm housing which is equivalent to 1.12 A/R. but they turbo has a fricken big 71mm compressor to accommodate for a decent spool time.

Of course the problem is that you have to big of a housing. Some people like faster spool so they go the .49 A/R and some people don't care about the spool as much as they do about power so the go with the .63 or .76 A/R with more airflow, but they certain don't go to a 1.06 A/R. That big of a housing go with something like a gt40r.

 

[techghost]

any idea where i can get a smaller housing from and for how much??
how come you can hit full boost at 4.5k rpm?? what are ## other mods??
sounds great!! link me to some of ## videos and pics

 

[1gDSM4g63]

The HX-52 has a much bigger inducer compressor to accommodate the big housing for faster flow. It's also a t4 twin-scroll turbo setup with a 100% twin-scroll manifold using two wastegate and the Holset turbos are much better designed then the Garretts.

Here are more pictures.

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my turbo vs. 16g

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twin-scroll turbo and twin-scroll manifold

 

[techghost]

Woof that is one crazy setup... How muhch is hx52 flowing?

From where can I get a smaller t3 housing?

Or is there any work around of my spoolup issue?

 

[1gDSM4g63]

My HX52 turbo flows about 90-92 lb/min.

As for you turbo, just go with a smaller housing. You don't know any Asia vendor maybe try eBay but Tims Turbo and G-Pop Shop are cheap American vendors.

 

[BoostFrenzy]

Once I get on my laptop, I'll edit this post and send you a link to a vendor with ALL the hotsides for a GT30.

EDIT: Here you go. Garrett's site says you have a 90mm V-band discharge and that doesn't seem to be an option in the smaller housings. Do you have a T3 or a T4?

 

[jrohner]

Well huge exhaust housing means slow spool. What do you expect? Don't even attempt to try compare any part of it to a 16g.

 

[techghost]

It's a t3

what if I will get a .48 ar housing on my 30r? Will there be any disadvantage because of this housing? I assume flow (my 30r is 60lbs) will be the same.