The GT3076R-13 is an uncommon turbo and Im having trouble finding dynos with it. Do any of the tuners here have a comparison dyno of the -12 (56 trim) and the -13 (60 trim) versions of the 3076R on the same car?

3076-12 specs
Compressor: 76.2mm exd, 57mm ind (56 trim)
Turbine: 60mm exd, 55mm ind (84 trim)

3076-13 specs
Compressor: 76.2mm exd, 59mm ind (60 trim)
Turbine: 60mm exd, 55mm ind (84 trim)

 

You will find several dynos of the -12 and -15 becuase they wheel is the same but as for the -13 there are very few, honestly the sheets I have seen show a very small amount of additional lag but better topend. Well worth the 80hp gain, I perfer the -13 turbo of the -14 (GT3040) but both are nice if you want more than the average GT30HP.

 

Thanks for the reply. Im not a fan of the 3082 (aka 3040) because I feel the wheels are a bit of a mismatch. I believe the turbine will run out of breath long before you can fully utilize the compressor's full potential. Therefore I opted to stick with one of the 76mm compressor wheels.

Ive seen the -12 push as much as 550whp on my motor before but the torque really took a dive at high rpm. I was hoping to sustain that torque at high rpm I cant decide between either a bigger turbine AR or a bigger compressor trim.

What about a -12 dyno vs a -14 (3040) dyno?

 

the -13 is rated for 600 whp, and comes with the option of using a "S" cover with 4 inch velocity stack inlet, 2.5 inch outlet.

When i get to the shop i'll take some pics of a -13 we have sitting around. it is a 7 bladed design instead of the 6 blade you seen on most 3076Rs.

 

Cool. You wouldnt happen to have any dynos of the -13 would you? I know what it looks like. All GT30 76mm wheels (48, 52, 56 and 60 trims) are cut from the same wheel cast - the larger 60 trim. Perhaps even the 71mm wheel but Im not sure about that.

I just need to see these turbos in action inorder to make a choice between the -12 and -13.

 

heres a -13



heres a -12

 

Yup the -13 has the S cover, .70 AR 4" inlet, 2.5" outlet. Is that a Precision cover?
the -12 has the E cover with Antisurge, .60 AR 4" inlet, 2" outlet.

 

I have a -12 with a to4s cover and a .82 backhousing... I am shooting 450whp on pump and meth on a flash. How hard is it to convert my -12 to a -13? Is it simpily swapping the compressor blade?

 

You'd have to swap out the entire CHRA to change wheels. It would cost you about $850 to get 5lbs/min more flow. And youd need a new compressor cover to fit the larger wheel. Def not worth it.

Howcome you guys need to run alcohol injection to reach big HP? Ive seen dynos of the -12 making 550whp and 565whp on a 1.9L B18C1 motor without nitrous or alcohol.

550whp 3076-12 .82 AR @ 24psi
565whp 3076-12 .82 AR @ 32psi

 

I have the -12 and I just made 475hp/419/ft lbs at the wheels.

 

Muckman, honda's heads flow a lot better than ours.

Scorke

 

Alcohol injection allows you to run more boost on pump gas. Without going into a lengthy debate and to make a gross over-simplification, alky essentially makes your 93 octane the equivalent of 100 Octane fuel, which in-turn allows you to run more timing and/or boost because it is less likely to pre-ignite or detonate. Both dyno plots that you linked to were achieved using c16, which IIRC is 117 Octane.

l8r)

 

Not worth it then... yeah I always wondered that! You guys are getting good numbers with these turbos. I believe with an AEM and Meth 500whp is obtainable. Thanks for the info ..keep it coming.

 

You don't need an AEM to make that kind of power with meth, even a lowly piggyback will do. Just need some kind of engine management (preferably with alky control) and a big enough turbo - e.g. a 2.3l stroker with a 35r and meth should have no problems hitting 500whp.

l8r)

 

Matt @ Slowboyracing was kind enough to send me this dyno of the -12 and -13 on the same STI @ the same psi. I dont know anymore information than that.