Coheed

Hey guys. I am doing some changes to my setup, and I am curious on your thoughts of how the 6262 will perform vs a GT3076r. Here are the specs on the engine:
86/86mm
2.0L
T3 divided 1.06 GT3076r.
3" exhaust.
Pump 91 tune.
8.5:1 compression.
Rev cut at 8800rpm.

This is an SR20VE engine. It has variable lift cams. Here are the two cams I tested.

Cam specs at .016"
OE SR16VE: RED
Low lobe INTAKE - .279" LIFT / 200º DUR - Low lobe EXHAUST - .313" LIFT / 244º DUR - OVERLAP - ---º
High lobe INTAKE - .437" LIFT / 280º DUR - High lobe EXHAUST - .437"LIFT / 280º DUR - OVERLAP - 70º

OE SR20VE 20V:BLUE
Low lobe INTAKE - .398" LIFT /228º DUR - Low lobe EXHAUST - .327" LIFT / 244º DUR - OVERLAP - ---º
High lobe INTAKE - .472" LIFT /278º DUR - High lobe EXHAUST - .439" LIFT / 280º DUR - OVERLAP - 57º

You can see that on the GT3076r the 20V cams hold out better up top after 7800rpm. The SR16 cams had a bit more timing throughout the map, so it isn't a completely direct comparison. 14psi made 360whp and 10psi made 305whp.

Now I am going with a ball bearing 6262, and possibly selling the GT3076r. What do you guys think the new turbo will make in comparison?

Coheed

It may be worth adding that high boost 26psi made 478whp with 438wtq on the GT30r. Peak power at 6500rpm holding to 8k before dropping. Just looking to hit 500whp but with 20-24psi boost. The divided housing seems to choke the engine on the top end, so I am going with a open .82ar 6262.

Down the road, I may shoot for 600whp+

turbociv910

the hell is a sr20ve

Coheed

Its an SR20 with Vtech

That's why it has high lobes and low lobes.

I was convinced to go with the 6262 over the GT35r from a local Honda Tuner and he has nothing but great things to say about them. figured I would give one a shot to see how the power will differ. I expect a bit more lag, but I am hoping to make my 500whp goal on 20-24psi without too much trouble. The GT30r seems to be maxxed out at only 480whp or so. More power could be had with tuning for sure, but all that torque causes other issues.

TheShodan

iTrader: (14)

I'd have stuck with the GT35R and directly bolted in as opposed to the 6262. The GT3076R is 52lbs/min, while the GT35R is about 62lbs/min and the 6262 about 66lbs/min. Lag is to be expected with either the GT3582R or 6262, but you get a bit better bolt-on usability with the GT3582R

Coheed

I was toying with the idea of the 60-1 since a local shop has awesome results with it. And I was going to go with the 35r, but I am getting an awesome deal with this 6262. Much cheaper than a GT35r. I will gladly sacrifice a little bit of spool to gain some top end. To be honest I've never been in a 35r-powered car that was not laggy. So expect it.

The new turbine wheel is lighter than the old one, perhaps this will make it spool even better?

I have been unable to break 500whp on this GT30r on 26psi boost. The GT3076r seems to have a lot of backpressure building in the housing, and the divided housing doesn't really help.

I have my reasons for going with a larger turbo at this point, but it is the next logical step.

My expectation is to hit 400whp by 1 bar on a pump gas 91 oct tune and 8.5 compression. And hopefully break 500whp on 20psi.

TheShodan

iTrader: (14)

See comments in Bold
No one can judge that yet. The turbine wheel still uses exhaust energy and I'm still not yet convinced that a thinner hub is going to be enough of a difference of rotational inertia to warrant better spool. I've no other comment to the new Precision change as of yet, but as a matter of theory I'm still at a "meh" stage. We'll see as time goes along with this new design.

Nor was it supposed to help contrary to popular belief. You have to understand, you're still around 52lbs/min. You'd be hard pressed to do it at over 30psi, and even so, is about outside any effective range that a turbo of that design was meant to be. Even changing housings isn't going to help.

Of course you do. But a 60-1 isn't going to get that same result. 500whp at that compression on any turbo is going to require some other way for the engine to resist knock at those pressure levels. That may mean Meth/water injection, E85, Race fuel, or whatever, but you're going to be HORRIBLY pressed to do that type of power with any usable powerband on 91octane with ANY of the turbos you're choosing. IMHO, stay with tried and true, bolt up with a GT35R and prepare to use some other type of fuel other than your 91 water

Coheed

Well said Shodan. I am going to run 100 octane for medium boost pulls on the dyno. The tune is designed for 91 octane pump, and since I am OBD2 I am hard pressed to keep the car legal. It passes the testing every year, but going with a standalone is not an option. The tune is good, but isn't adjustable. So I am trying to make the best of what I've got to keep the car legal as well, and that hinders me as well.

The 60-1 powered VE motor local here did 421whp on 13psi, but with 9:1 compression and a honda computer.

I guess we'll see what happens.

TheShodan

iTrader: (14)

Check out Californiadad's setup. He was in the same position as you, and used meth/water
https://honda-tech.com/forums/forced-induction-16/my-b18c1-engine-build-assembly-2951496/.

I suggest GT3582R or some Garrett variant in this case.

Coheed

I have since switched to a precision bb 6262 unit. I am using a factory Nissan 20V cam from a P12 primera. I have a set of factory N1 cams on their way that I will test on the dyno in comparison. Here are the cam specs.

@ .016"

OE SR16VE N1:
Low lobe INTAKE - .331" (8.4) LIFT / 220º DUR - Low lobe EXHAUST -.313" (7.95) LIFT / 244º DUR - OVERLAP - 0º
High lobe INTAKE - .472" (12.0) LIFT / 288º DUR - High lobe EXHAUST -.469" (11.9) LIFT / 288º DUR - OVERLAP - 74º

OE SR20VE 20V:
Low lobe INTAKE - .398" (10.11) LIFT /228º DUR - Low lobe EXHAUST - .327" (8.3) LIFT / 244º DUR - OVERLAP - ---º
High lobe INTAKE - .472" (12.0) LIFT /278º DUR - High lobe EXHAUST - .439" (11.15) LIFT / 280º DUR - OVERLAP - 57º

From these profiles, what do you guys think? there is speculation that the 20v cams will provide a superior bottom end. The ramp angles are designed for a 2.0, rather than the N1 1.6L.

nealnanoHX

The SR20VE is stupid rare and was never available in the USDM . Nissan almost got a law suite from Honda for using what is identical to Vtec. Since Honda owns the patent and Nissan had to stop making them.

NA James

How did it do on the dyno? Cool engine.