Hello all, soon I will be another person running the ZFR 6758 on my cobalt. I couldn't seem to find a specific amount for a recommended boost PSI. I've seen 26/27 and others at 30 and others at more. ZZP told me that you can go over 30 but I really don't want to blow up my motor.
I have all supporting mods (minus Opel injectors). Those that do run the 6758, what PSI are you at?
I am also at 4300 ish feet above sea level if that makes a difference.
NOTHING has been done to the block or head, just bolt ons.

 

its all in the tuning. What are your goals for the car?

Modding with a bigger turbo you have to take the risk that something could blow up.

I ran my EFR at all manners of boost from 18 psi all the way to 30 psi.

It depends on how you want the car tuned, boost is just a piece of the puzzle.

 

How's that awd treating you?

 

It's slow

 

That is true, I plan on doing drags with it as well as just messing around on the street. I'll talk to my tuner and see what we can figure out. Right now it is tuned for the K04 which made 303 HP and 402 TQ

 

Its not slow lol. Its as fast as a tuned turbo cobalt is

 

I'm running a 7163 at 28psi stock engine but running meth no issues at all but the boost comes in slower than the 6758 but I'd bring the boost in smooth on the ZFR and you should be good also that's pretty high up there to be trying to run high boost like 30psi I think I'm at 3300ft and have to run way more wgdc than a friend does at sea level for the same boost

 

It's great. Different beast from the Cobalt for sure.

 

At 20 psi on 91 I made 360 whp 320 wtq. That was great to daily drive around. I was also on stock clutch, motor and transmission at 100k miles. It slipped a bit but not too bad.

However. YMMV...thats the nice thing about the EFR is you can go ***** to the wall or you can tune it for daily and still be efficient and fast

 

I kinda miss that super fast spool I have the 7163 coming in smooth but when it hits 26+ it really pulls

 

Chances are I'll have it at 26/27 PSI. It is my daily so I don't want to blow it up just yet. Anyways thanks for the insight guys.

 

40 rolls this weekend?

 

I'll make sure to have it tuned so the boost rolls in. Don't want to destroy my transmission either!

 

^ in for vids

 

Sure I'll meet u halfway!

 

Slow is not fun, 3rd gear heaters at 60mph is fun. transmission is a crap shoot. People break just as many at lower power. I didn't even have mounts, just the hypersingle and never had a problem.

 

I run 28 on zfr with meth, she likes it. But it ramps in from 24 into 28 , that turbo on the cobalt is great, it pulls hard all the way to redline, doesn't stop

 

You're still around? Assuming from your comment still running the efr and the transmission is ok

 

No, just selling the last of my parts. Transmission was good when I traded it in, the clutch would slip every once in awhile though.

 

That explains the return. What did you move on to?

 

14 cruze and 14 yamaha fz09. Went back to motorcycles, faster and less to fix. Also have more fun riding wheelies.

 

Ya you're on a pretty slow ramp

 

compared to no ramp lol

 

mine ramped to 26-27psi up top and to my disbelief the stock clutch is still holding

 

I had a ky stage 3 and that didn't even hold