It is a very big turbo. Dave and Matt def pushed the limit with size, but man does it look great in the engine bay!

 

Yup, I have the forge BPV with it. Works great, thats the nice thing about this turbo compared to others. You do not need a BOV with it!

 

https://www.cobaltss.net/forums/2-0l...15/index4.html

This is my build thread...page 4 there are some great pictures on the engine bay taken by Riceburner (Adam)

 

I seen the pictures of it and I was just making sure. I think I've watched that video you posted about 100 times since you posted it. Haha. The car sounds so damn good.

You know who has a K04 turbo'd cobalt, 2 thumbs, and is extremely jelly? This guy...

 

Haha thanks man I really do appreciate. It's nice getting recognition after alot of work!

 

Compressor flow chart

 

I would email Dave at Performance Autowerks, I'm sure he could get you all the info that you need!

 

Exactly what I wanted to compare with the EFR. Seems like his turbo is right in between a Gt3071 and a gt3076. Honestly a pretty nice ass turbo. I want some in car vids!

 

One of the reasons that the ZFR can make the power it can for the size of the wheels is that it can afficiently spin at a higher rpm than most turbos. The titanium aluminide exhaust wheel is a big part of this.

I don't know anything about the wr3, so I am not comparing it to the ZFR. I am just pointing out that the ZFR makes power beyond what is typical for the compressor wheel size.

 

Very interesting Matt! Like I have said several times, I have NOTHING against the ZFR. The turbo is great and will get a lot of people to the level that they want! Honestly we were talking about going with the 6758 but then Dave decided to create a WR-3. Ive said to people I don't want it to be a pissing war, it's all in preference! Both great turbos that will get the job done

 

What boost level was needed to reach those numbers and when do u see full spool? Do you have the graph?

 

Yep, those trap speeds from the 1/4 mile at 29 psi sure show it! 130+ trap speeds is in 500whp territory for the Cobalt SS. In which it seems like the 6758 is capable of.

Exactly, either one you're still gonna have the fun/ power you're looking for. Just another option out there for anyone that wants it.

 

Yes I have a graph in my thread. With the 410/420 that I am on right now I spike 25 and hold 23.5

 

Cant wait to receive my girdled block so I can get the engine finished and try it out.

 

Will you have cam's and fuel lobe as well right? 29 psi 500whp?

 

i will clarify here because it seems theres a lot of misconception here of whats actually being used.

the center section is 100% different. dual ceramic ball bearing cartridge thats made to use water and oil. it uses percisions compressor housing and a k04 exhaust housing. we use factory solenoid aswell. 56.5mm turbine wheel 55mm billet compressor wheel.

the only turbo we still use a k04 center section in is the big wheel k04+ everything else uses a

 

theres no real reason for comparison here.... both are great and both will make power. what it comes down to is personal preference imho.

the zfr you guys rate to 450 but correct me if im wrong... i thought a normal 6758 is rated at 50lbs/min where as a 6258 is 45lbs/min. so with that being said im pretty sure the zfr can flow quite a bit more then what its rated to from zzp. both are great imho and offers options to the borg fans and the percision fans.

 

Yes, we have pushed the zfr6758 well past 500whp, but we don't ever recommend others try to push them that far. They are very well suited for 400whp on gas or 450whp on e85.

 

oh i know where you have pushed it... i just thought borg warner rated the 6758 to 50lbs a min maximum so i was just curious.... customers shoulder never push the limits without proper tuning and proper setups. idk how many guys ive had come in with hack job cars. one prime example was an srt4 that came in with a agp setup on it that could of pushed a lot of power on corn. guy was running around with corn in the car but no adjustment to the tune for any of what he had for a few months.... needless to say we did a leak down test on the motor because something didnt seem right with it and it had 38% leakdown in number one... "all it needs is a tune" we were told.

 

6758 is rated at 49lbs/min so roughly 490Crank hp. I want 500whp from my 6758

 

Over boost it lol jk

 

The old school rule of thumb 10chp per each lb/min doesn't really apply. We have the advantage of direct injection raising hp at the same airflow. E85 also throws those numbers off a decent amount further.

 

Yep, I mean kinda makes sense. I made 415whp 435 wtq at 24 psi on e47. If I had more fuel and upped the psi, I see this turbo can make 500whp. Fuel lobe,cams valves motor build is on her way.

 

there is like a $500 difference in turbos, so i hope the wr-3 is better than the zfr, but if not, why bother paying the extra cash for it???...

 

just because ones cheaper doesnt make it better or worse. the efr in my opinion is a cheap turbo but its not a bad turbo by all means. for what you get in the package its cheap when you compare it to percisions. when i had the big turbos on my car. i payed almost 300-350 less for the efr of comparible size compared to a billet wheel percision turbo. the percision stuff is not cheap.