Thread: Gt3076r or gt3576r ?

My gt2871r took a dumb. I want to upgrade... I can't decide between gt3076r or gt3576r. My car is street and strip. I really want to be in the 10sec in 1/4 mile. I was hoping gt2871r will get me there but I was disappointed by it.

I want to achieve 10sec by pump gas. On Zilvia most people say you can be in 10sec range with 400whp using gt2871r on pump gas.However nobody did it nor can I
Gt 2871r is rated at 450hp , with 20% drivetrain loss, it will be 360whp. That's what everybody got so did I.
.. I am afraid gt3076r will be not enough to get me there on pump gas. Gt3576r probably get me there but probably too laggy for street car.

The car is s13 with sr20det

I am planning using twin scroll t3 manifold by xs engineering for 500.00

On the quest for 10sec, I destroy a lot of parts.

Blown engine- pistons cracked--- so I built another motor with forged pistons and rods
Blown transmission- ouput shaft snap- replaced with z32 transmission
Blown rear end replace the rear end with j30 rear end and axles , 2way lsd
Blown turbo --replace with ??????

I don't know what else I will blowing next
Anybody has experienced with these turbos.
Any thoughts will be appreciated

We gained 35whp just by switching a GT2871 to a GTX3071R - No reason to throw a huge wheel in there and slow your spool. You can hit 400whp with a GTX2867R if that's all you are shooting for. If you want bigger gains start thinking VE head also.

If your using pump gas I would use turbo in the 58- 65lb range with a ve head and I believe you could get into 10s traction permitting in the mid to low 20 psi range.

A buddy and I took over the build of an S13 which had a GT3076R. It made 414WHP at 20 psi on E85. Switched to gasoline (93 R+M/2) and water/meth injection and went to 25 psi. This was because the fuel pump ran out of head room. We're pretty sure it was making 450WHP or so. This was with a faux Greddy intake manifold, stock DET cams, and a compromised exhaust manifold. It could have made much more with some real cams and a better exhaust manifold.

As for whether or not this is enough for a 10-second pass, other people would have to chime in. This was not a drag car. It was a street car, and the turbo is the perfect size for a RWD street SR20 in my opinion. Boost came on early and came on strong. I've driven more powerful setups, but none were as nice as this one.

Just fucking around, we ran a 12.2s quarter mile on auto-x tires. This was with no drag prep whatsoever, and on a poor surface.

The GTX3576r is a beast. It spools faster than the GT3582r and makes more power everywhere. The T350 turbine is a perfect match for the 76mm compressor. Much better than the undersized T30 turbine they used in the regular 3076r. I normally suggest people skip that turbo. The GT2871r and GT3076r just aren't ideal setups. They work, surely, but there are better options out there.

Not many people have used the GTX3576r, as it is relatively new. But some shops have used it with amazingly good results. It would be my first choice for a 500whp capable turbo, though people are making over 600whp with it now. I can't speak for experience specifically on the GTX3576r, but I used a GT3076r on a few projects. Including the super sentra. It performs best with a .82ar exhaust housing, but still rides the surge point of the compressor. The E cover used to combat the surge is not very good. If you go with the GTX3576r you should be able to use the non-ported shroud housing for it with minimal surge issues. Hell, I surged on the GT3076r even with the ported shroud.

Though the NS111 turbine wheel flows really well, the 71mm compressor is just too big for that tiny turbine wheel. Even the GTX 68mm wheel is a bit on the big side, but it's the highest hp T2 turbo you can get (that's efficient). Of course there are some T2 flange GT30r-based turbos out there, but the housing flows like crap with a clipped turbine wheel that further reduces efficiency.

I'd say go for the GTX3576r. It will not be as responsive as the smaller turbos, but you will hit your goal. And for drag racing the lag is not bad at all. Or if you want, you could go for the GTX3071r. It is still 500hp capable, utilizing the best matchup of wheels in the GT30 frame.

There is no denying this. To get the same feel we had in the GT3076R car, today I would probably go with a GTX3071R for the better matched wheels and newer tech.

More good points. I forgot what AR the GT3076R we used had, but it did have the anti-surge housing which cuts down on efficiency.
Another great argument for the GTX series.

The S257 fmw is a good option if fitment is not an issue and cost less than the gtx options