Which do u think is the better option for the street?

 

Honestly upgrading turbo is so much $ and unnecessary. I just had my cobalt on the dyno yesterday it made 360 whp amd 435 tq. And thats on 93, i havent seen anyone else with 350+whp and 400+ tq with stock turbo and pump gas, but ive just got full bolt ons and a good tune

 

Chris- I'm guessing those numbers are converted to engine hp, because there is no way you can make that much power on 93 to the wheels on a stock turbo. Highest whp I've ever seen on a stock turbo was around 353 on E.
Op you have to decide what you want to achieve. The max you will get on e blend stock turbo is 340-350whp. If you are satisfied with that, then that's ok. Going bigger turbo and ramping the boost in will afford you a wider powerband, especially higher in the rpms where your stock turbo is dying off in power. It can also help you to gain traction off the line by not making as much torque down low.
The trade off is the cash outlay for buying a bigger turbo, and the stress it might put on the trans with more hp and torque overall. If you don't ramp the boost then you will have major traction issues especially on a quick spooling turbo like a zfr/efr setup. If you have access to e85 and can mix it to e47, the stock turbo can give you decent power and lots of fun, it all depends on what goals you have. Turning down the output of a bigger turbo with room for more is always a great way to go if you have the cash.

 

I thought so too, ill get the dyno sheets to prove it. You just need a good tuner and i happen to know one of the best

 

Or a happy Dyno. Either way, you don't make the power you think you do. Especially not on 93 octane.

OP - A 6758 or 7163 ZFR is a perfect upgrade.

 

Agree on both accounts.

The engine is not making that power on 93, the turbo cannot move enough air and 93 cannot handle significant timing. Get a 60-100 time, starting at no boost at 60 then WOT through 100.

 

Im going into work now when i get off ill play with her, get yall that 60-100 time, its on 25.5 psi and i had the tune by a guy (Tim at MV performance athens ga) he knows what hes doing for sure. It was torque steering on the dyno and rips tires in 5th

 

I mean he may, but there are physical limitations. Ripping tires in 5th is just a sign of shitty tires (and a great way to kill a clutch/transmission) , put some 200 tread wear or DOT radials for grip.

 

Obviously **** tires effects grip but these are nitto motivos ive ran on the track only twice. I have a pair of new michelin pilot sport a/s 3 but those arent gonna go out on the street. But ill get some more numbers for yall

 

5th isn't a great gear for wot, just so you know. I'm not saying you aren't making good power, just not as much as you said on 93
Op if you have the funds 7163 is a great turbo as it won't kill the trans down low, and has plenty of power in the upper rpm's plus it's direct Bolton from ZZP.

 

Yea making this much power i would never go WOT inder 3k rpm, but back to OP i feel the stock internals and trans cant handle enough extra broost compared to what the stock turbo puts out to make it worth upgrading, its sort of an all in thing in my opinion.

 

That's just not a true statement. There have been plenty of 400whp cars on stock trans/engine. The stock clutch too.

Heat and detonation kill motors. A larger, more efficient turbo isn't going to just automatically kill a motor.

Transmission is pretty strong too, if you're good to it. All in the torque delivery.

I speak from experience. Quite a bit with this platform.

 

dyno guys fudged with your numbers, cause only way ur getting 360 is on e85, that turbo cant push enough air too make that much power. what psi?

 

no freaking way ur making 360 on stock turbo at 25 psi lol that dude screwed with the dyno numbers.

 

The name is Tim Matherly, hes a pretty big time drag racer, theres no point in lying about numbers lol, but think what you wish ill enjoy myself regardless

 

He is certainly lying about numbers or displayed them as crank hp not wheel hp. ZZP who lives and breathes this platform has not done that with a stock turbo on 93 and they have done a significant amount of work on this platform including getting a two-step for drag applications to work on the stock ECU without additional hardware.

 

Why dont we settle this with a friendly drag race at a local track?

 

that tuner has gotta be the most powerful magician on the planet if your seeing 360whp with stock turbo on 93. I don't care how good he is, he cant overcome the limitations of a turbo with a tune. not even the crazies who tuned stock turbo for 28 psi got past 330. It wont flow enough air, period.

 

Post dyno graph