I've been reading on here a lot about different turbo upgrades and I'm just curious about how much slower a 7064 would spool? If it would be a lot slower, why not look into one of buying those fancy quick spool valves. In order for the valve to work you would need to buy the .92 AR to get the twin scroll housing though.

This is mostly just paper racing but I was curious if you could get a 7064 to spool in the high 3ks it would carry all the way to almost any redline right?

If I ever did go big turbo it would probably only be the 6758 because I wont want to build the motor, but this kind of stuff is really starting to interest me. If I have something fundamentaly wrong with how Im thinking please feel free to flame me!

 

It prolly does spool in the mid to high 3s. You would have to source a mani without a wastegate flange or the external wg version is a t4 flange iirc so then you would have to source a t4 mani for that. It can be done but its not an easy option. The 6758 makes plenty of power...550 is what zzp got out of it

 

7163 I think is the better option for us. It's not listed though.

 

7670 or no *****

 

I have thought about one of these new EFR's replacing my aging 70mm on my 98 z28.... hhmmm.....

 

Oh, I agree the 6758 is probably one of the most practical big turbos available for our motor, but like I said, just theory craft.

Also, I didn't see the 7163, what makes it so much better?

 

Designed for powerful performance in a compact package, BorgWarner's new EFR-7163 turbocharger achieves up to 550 horsepower while using a small B1 frame size that fits easily into a tight engine bay. Track proven in the IZOD IndyCar Series, an aluminum bearing housing reduces the turbocharger's overall weight by approximately 2 pounds. For fast response, the 63 mm mixed-flow turbine features lightweight Gamma-Ti material and innovative geometry to increase turbine flow capability while providing lower inertia than a conventional radial-flow turbine wheel. To provide the best balance of quick response at low engine speeds with high flow capacity at top engine speeds, BorgWarner engineers optimized the 71 mm (OD) compressor wheel to manage as much flow capacity as a larger conventional wheel. For added flexibility, the turbine housing accommodates either a v-band or T25 inlet connection option for engines using an open manifold or a T4 twin scroll housing for engines using a divided manifold.

 

So its like a big wheel 6758?

 

Just did a quick search on the 7163. Spools stupid quick due to a new turbine wheel. They tested it on a ms6 and said at any rpms above 2400 they went from full vacuum to 22 psi in 400-500 rpms.

 

Yea well it's bigger than the 6758 in both exhaust and compressor turbine. It's bigger than the 7064 in the compressor turbine but smaller on the Exhaust side. So more power than both 6758 and 7064 and less lag than 7064. Shouldn't really be noticeable from 7064 to 7163. I'd go with 7163 though. Still want it too!

 

Where are you guys getting the 7163's from at the mo ?

Cheers

 

That sounds awfully impressive, do we know anyone with one installed on a cobalt?

 

Don't think they're released yet. Indycar is testing them.

 

How much power do you think a front wheel drive car can handle? I make 400whp/400 torque on the 6758 and the tires just spin all the way through 2nd and most of 3rd. I run 235/40 Nitto 555’s.

Are you planning on running slicks year around and just changing them every few hundred miles?

The 6758 just barely fits behind the engine so if the 7064 is any bigger you’re going to have major fitment problems.

 

^ get the air hammer out and dent the fire wall

 

I probably have a little more than that and I'm on e47. I only spin fist and second. 3rd gear I have a boost ramp so I'm not spinning at all. 245/40 nitto nt05. I'm sure you can make it fit behind there. If the s259 and the pte6262 would fit, I'm sure you can make the 7064/7163 fit too.

 

I think those two fit bc they sit lower due to the way they mount to the manifold they come with.

 

Yea, I'd assume that as well. If there would be a bigger turbo application that's bolt on. They'd probably have to make it sit lower.

 

Well I'm mostly thinking kappa application now. I dont think big turbo on a Cobalt is worth it really

 

thank you for wording it this way, I hate when people say "spool by x RPMS" because that's completely dependent on what RPM you start your run at.

 

Sounds like a pretty Bad Ass Turbo! Fasti How is this Turbo compared to the your ZFR?

 

They're larger turbos than the ZFR. Best example I can give is the ZFR is like a gt3076 compared to the 7163/7064 which is like a gt35r. Most likely have slightly more lag, but make more power all over the curve.

 

gotcha, See my thing is the Lag, I cant stand too much Lag and thats why when I swap my K04 out I'm going ZFR like yours, I would like to have minimal spool time and little lag. At what RPM are you fully Spooled?

 

I have a boost ramp. It's pretty much instant though. Feel like the k04 much more power though.

 

It took a year and a half just to get the 6758, it's been out for 2 months, and you guys are already talking about the next biggest turbo.