Hey guys what is the benefits or draw backs to this?

I know the AR is a bit low when I normally see .63 or even higher.

What you do you think the spoolin characteristics of such a low A/R? What do you think my WHP will top off at on a b16 motor on 12lbs of boost.

Pros and cons?

***PICTURES AT BOTTOM!!!!!!


Modified by Urugly at 3:00 PM 12/19/2006

 

Sorry this is on the exhaust side. I don't know the trim this one came with. I just know that it is a GT3076R and the exhaust casing shows .48

 

what are the HP goals? perhaps the gt28rs is better suited if you want quicker spool.

gt30 with .48 is a complete mismatch.

 

Yes they do.
3076 comes in .63, .78 (divided), .82 and 1.06 A/R turbine housings.

 

Peakboost can you set you up a .48a/r for that turbo!

 

with the ball bearing center section, you can run the .63 and get good boost response, while seeing all the benefits of a higher rpm peak tq imo.

what motor are you putting this on? what are your goals out of curiosity

 

sorry guys been out of it due to holidays. It is going in a B16a2. Compression is a bit high at 10 even from what I remember.

I would be very happy at 375 whp at 12 lbs of boost. It is DD so I just want something responsive but with a little kick still high end.

**The 3076 doesn't normally come in this A/R on the exhaust side, but the guy I bought it from I think had it custom ordered to this spec. I can't even find out what the trim is.

Will this AR limit my peak power by that much?

 

Heres some pictures of it if someone can help me post it.



Thanks.

 

It worked!!! Some more. Tell me what you think.

 

Try it out, it should be faster spooling and more responsive compared to a .63ar or .82ar. Will make your 375whp goal too, but not too much more with that housing. But you could have made that goal with something as small as a GT2871R, so you're losing response running a 550whp turbo at 375whp.

 

I went with the .63a/r on my ls turbo project. i'll take the small hit in the bottom end for what is gained up top!!!


Modified by 92DAturboteg at 6:39 PM 12/20/2006

 

interested to see how this does definately let us know when you get it tuned and dynoed please

 

I def will, just tying up a few loose ends, i'm thinking that 2.0 liters and a heavily worked head will get that turbo screamin by 4500-5000

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LeGeND4LiFe &raquo;</TD></TR><TR><TD CLASS="quote">Try it out, it should be faster spooling and more responsive compared to a .63ar or .82ar. Will make your 375whp goal too, but not too much more with that housing. But you could have made that goal with something as small as a GT2871R, so you're losing response running a 550whp turbo at 375whp. </TD></TR></TABLE>

Slowboy racing made over 630 WHP on a GT35R with a .48 A/R mitsu housing, and those flow even less than T3-style turbines. I made over 450 WHP on a T3/TO4E 57-trim with a .48 A/R housing and a Stage V turbine before, on a DSM. Being a .48 A/R housing isn't going to magically stop the car from making any more than 375 WHP, just find other ways around the increased backpressure and up the boost to make up for it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohc_turd &raquo;</TD></TR><TR><TD CLASS="quote">what are the HP goals? perhaps the gt28rs is better suited if you want quicker spool.

gt30 with .48 is a complete mismatch.</TD></TR></TABLE>

I agree, I accidentally got a Precision GT3076 with a .48 ar. I ordered the .82 ar. On a 81.5mm LSVTEC 9.5:1 motor with head work, type R cams etc I made only 300 whp at 16lbs of boost. There was so much backpressure and restriction by the exhaust housing, I only made an additional 3 whp by uncorking the exhaust completely at the downpipe. The turbo was working so hard, it wasn't worth it to turn up the boost. Intake temperatures would go thru the roof and exhaust contamination in the cylinder head from the excessive backpressure will increase detonation and cylinder pressure. Get a .82 a/r at least. Spool is not affected that much in GT series BB turbos by getting a larger housing

Don't waste your time with the .48 a/r

 

oh mang....i got this turbo only becuase I got a discount on it. I truly wanted a .63 AR. Do you guys know who I can contact if I traded this in? Since it is brand new still, I would like the .63 AR so spool is quick and top end can still scream!!!

I don't mind 400 whp at 12lbs of boost and maybe more at the track dialed up to 18 or something.

Anyone I can talk to for a swap on the exhaust side?

Thanks.

 

You might as well run what you have. You can always order a new turbine housing later and switch it out very easily. That will allow you to compare both A/Rs back to back. Keep the one you like more and sell the one you dont.

 

I guess I can just run what I have. I just don't want to push the turbo too hard.

The whole point of selling my t3/t4 standard was so that I can push a bit more horses with out pushing it to its limits.

Hopefully I work out a manifold with Phil at spoolin (to keep my AC and PS) and then get some numbers for everyone to see.

 

Just a side note: You may not be able to get the same bolt pattern on the larger exhaust housing. For example you may have a four bolt exhaust housing on your .48 and the .63 may come in five bolt. Therefore you can't assume you can just swap housings. You will need a new downpipe. I went through the same experience. I had to buy a whole new turbo to avoid changing all my intake piping, downpipe etc. You will save a lot of headache by getting the right turbo or housing before you build your kit.

 

U can get the 63ar housing in a 4bolt discharge just like that one.

 

If you're trying to make 400ish at 12psi then don't waste your time with the .48, it'll never happen. The .63 is the smallest i'd even consider, and i'd recommend the .82.

 

Unfortunately, putting a really mismatched turbine housing won't get you better response with great top-end. Or else, we would all be putting T25 hotside with a GT42R...lol I agree on putting slightly smaller housing the improve low-end response, but not to that extent.

Whenever you start putting such a small turbine housing with a turbo that has a a big turbine wheel, it's no different than restricting the passage for high flow yet barely anything is gained at low flow situations. Obviously, people have reported better low-end response from smaller turbine housings which is given, but how much? Comparitively speaking, a smaller turbo with a larger turbine housing could easily spool better and flow just as well at the top-end as a larger turbo with a dinky turbine housing. For instance, downsizing to a GT3071R with a common size turbine housing (0.63 or bigger) would probably spool, respond quicker, and could fully use up the compressor flow to hit well over 400 WHP. On the other hand, choking the 3076R with the limited turbine flow would cause it to have a hell of a time flowing past the smaller 3071R without some serious back pressure issues. It's a lost cause IMO.

 

I agree with tony. I was in the same situation. I ended up wasting $500 on tuning and dyno time to come to the same conclusion. .48 a/r housing

 

Went from 300whp at 15psi with the .48 30R. Changed the intercooler, turbo to a 35r .82, and changed to E85 and made 480whp at 17psi, and the spool was almost identical. The 30R was so choked up that it wasn't even spooling quicker.