08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

Bnr k04-gt28

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Old 02-14-2011, 08:03 PM
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Originally Posted by pbass
You mean the 2860 is supposed to have a coolant hose supplied? If so, didn't get it.

My 2860 also has only 3 studs [Twilight Zone Theme].
No I dont think so. He was originally going to supply a line but now doesnt. You have to modify the ones you have. Hopefully you can get a stud on there from the stocker.
Old 02-14-2011, 09:26 PM
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What's the torque? If it's high, maybe I should get a new set just to make sure, and new nuts, too.
Old 02-14-2011, 09:37 PM
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Turbocharger Air Bypass Valve Cover Bolt
10 Nˇm
89 lb in

Turbocharger Air Cooler Outlet Pipe Bolts
25 Nˇm
18 lb ft

Turbocharger Brace Bolt - to turbocharger brace bracket and block
50 Nˇm
37 lb ft

Turbocharger Brace Bracket Bolt - bracket to brace
22 Nˇm
16 lb ft

Turbocharger Brace Bracket Bolt - to block
58 Nˇm
43 lb ft

Turbocharger Brace Bracket Stud
25 Nˇm
18 lb ft

Turbocharger Brace Nut
50 Nˇm
37 lb ft

Turbocharger Coolant Feed Pipe Bolt
35 Nˇm
26 lb ft

Turbocharger Coolant Feed Pipe Mounting Bolt
10 Nˇm
89 lb in

Turbocharger Coolant Return Pipe Bolt
35 Nˇm
26 lb ft

Turbocharger Exhaust Pipe Heat Shield Bolt
10 Nˇm
89 lb in

Turbocharger Exhaust Pipe Nut
25 Nˇm
18 lb ft

Turbocharger Exhaust Pipe Stud
25 Nˇm
18 lb ft

Turbocharger Heat Shield Bolt
10 Nˇm
89 lb in

Turbocharger Nut
30 Nˇm
22 lb ft

Turbocharger Oil Feed Pipe Bolt
40 Nˇm
30 lb ft

Turbocharger Oil Return Pipe Bolt
10 Nˇm
89 lb in

Turbocharger Wastegate Regulator Solenoid Valve Bracket Bolt
10 Nˇm
89 lb in
Old 02-14-2011, 09:43 PM
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Thanks imbroke! Will scavenge a stud off the stocker.

Hey cubaniche, were there any unusual tools needed?
Old 02-14-2011, 11:07 PM
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Originally Posted by pbass
Thanks imbroke! Will scavenge a stud off the stocker.

Hey cubaniche, were there any unusual tools needed?
No no special tools needed other than your normal socket set and an impact would be helpful.

DO NOT adjust the WG rod length! (Like I did) Leave it at the end like Bryan sends it to you. The car will hate you for messing with it. I adjusted it back to the way it was from BNR and now all is well. Waiting on a revised tune but, 70% throttle without a tune and 15psi I hit 31lbs MAF and 26VE
Old 02-15-2011, 08:10 AM
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Originally Posted by cubaniche
Sweet. Cant wait to see what the new 2871 does
By the time i get on the dyno i will be pushing 28 psi. Also I running like a 9gph nozzle on my car for meth. I see around 30 degrees on my intake 2 temp.

Last edited by turbo_chevy_cobalt; 02-15-2011 at 08:18 AM.
Old 02-16-2011, 11:14 AM
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Originally Posted by cubaniche
No no special tools needed other than your normal socket set and an impact would be helpful.

DO NOT adjust the WG rod length! (Like I did) Leave it at the end like Bryan sends it to you. The car will hate you for messing with it. I adjusted it back to the way it was from BNR and now all is well. Waiting on a revised tune but, 70% throttle without a tune and 15psi I hit 31lbs MAF and 26VE
Yeah, like Cubaniche said, the 2860 turbo has a slightly longer BNR CHRA, so it changes where the wastegate needs to connect to the actuator rod. A stock-like nut position therefore becomes a more "choked up" position (to use a baseball term) than it would normally be.

He's got the nuts right on the end of that thing as it stands now. I wonder if an even longer actuator rod would do us some good.
Old 02-16-2011, 11:29 AM
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[QUOTE=cubaniche;5563940]Well, finally got her on. The one I received was missing one of the studs that the elbow flange bolts on to and when I tried to put one of the ones from the stocker it wouldnt screw in...even with an impact. It was a pain and I didnt want to try tapping steel so I decided to go buy a nut and bolt and be done with it. It all worked out in the end. It was a learning experience for sure because those lines do not line up and it took some creative routing and bending to get it to work. Just waiting for BYT to send me a driveable tune cause shes knocking like crazy right now. I guess the E blend and different turbo are too many variables for the ECU. Here a re a few pics:

EDIT: The knock was caused by my fiddling with the WG rod trying to make it like stock. Bad idea. Basically it was keeping the WG open ALL the time.

Have you got that thing tuned and running right yet? How's it running?
Old 02-16-2011, 11:34 AM
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Originally Posted by hunter19707
EDIT: The knock was caused by my fiddling with the WG rod trying to make it like stock. Bad idea. Basically it was keeping the WG open ALL the time.

Have you got that thing tuned and running right yet? How's it running?
Yeah, that's what happened. Wastegate wouldn't close. Made for very little boost and a hot turbo.

Still in the early tuning phase. Getting airload down first. Still conservative right now until the airloads are stabilized. BYT's been working it with him. I believe his next revision will have him at 22-23psi now.

Cubaniche's on an E-blend too, so that makes this even more interesting.

As a side note, the turbo sounds different than the K04, for those wondering.
Old 02-16-2011, 12:02 PM
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Originally Posted by Stamina
As a side note, the turbo sounds different than the K04, for those wondering.
Probably doesn't have quite the same angelic sound that a real GT turbo has though There's nothing like listening to a real dual BB turbo spin up and slowly spin down. It's like a voice from heaven
Old 02-16-2011, 12:13 PM
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Originally Posted by Stamina
Yeah, that's what happened. Wastegate wouldn't close. Made for very little boost and a hot turbo.

Still in the early tuning phase. Getting airload down first. Still conservative right now until the airloads are stabilized. BYT's been working it with him. I believe his next revision will have him at 22-23psi now.

Cubaniche's on an E-blend too, so that makes this even more interesting.

As a side note, the turbo sounds different than the K04, for those wondering.
So, does E blend make much difference when combined with 91 than just with 93 octane alone.
Old 02-16-2011, 01:05 PM
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Yeah were in the early phases still of tuning but shes running well. Still nailing down airload. Once thats stable we will start working on power.

This turbo may not have the same 'angelic' sound as a true GT28 but it is sure loud and spools down slower than the k04. It makes a much longer BPV release sound than stock
Old 02-16-2011, 01:20 PM
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Originally Posted by hunter19707
So, does E blend make much difference when combined with 91 than just with 93 octane alone.
You can blend 1:1 with 87 if you want. It still lets you run more advance with the slower burn.
Old 02-16-2011, 01:34 PM
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ok, so I'ma noob here...whats the difference between this e blend and meth?
Old 02-16-2011, 01:40 PM
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Originally Posted by iboost
ok, so I'ma noob here...whats the difference between this e blend and meth?
You get kinda the same cooling effect during the burn so you are able to run more timing, adding power. Meth is a whole kit that needs a reservoir, a controller, lines and having to tap a nozzle into the cold side of the CPs.
The blend is simply finding a station that offers E-85 and then gasing up with equal amounts of 93 and E Atleast thats the 50/50 blend. then there are others running a blend that has more E than unleaded. Both need to be tuned for.
Old 02-16-2011, 01:41 PM
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ok. I run meth already so there'd be no real reason to run E85?
Old 02-16-2011, 01:45 PM
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Originally Posted by iboost
ok. I run meth already so there'd be no real reason to run E85?
Actually you can lol
I believe I Am Broke is running both or someone on here is running both
Old 02-16-2011, 01:45 PM
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Good to know. I appreciate the help
Old 02-16-2011, 02:41 PM
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Originally Posted by cubaniche
Actually you can lol
I believe I Am Broke is running both or someone on here is running both
No, not me....yet. Perhaps FF_Ace. Once this thing isn't my DD anymore I may consider it though.
Old 02-16-2011, 04:38 PM
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Originally Posted by iboost
ok. I run meth already so there'd be no real reason to run E85?
im running both and its working out great for me
Old 02-17-2011, 11:15 PM
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Thats bad ass. No E85 in hawaii though Nor anywhere near me in New York I believe...
Old 02-21-2011, 11:24 PM
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so when is the dyno or track day going to be? I would personally like to see a 1/4 mile MPH over any dyno sheet.
Old 02-22-2011, 08:32 AM
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Originally Posted by iboost
Thats bad ass. No E85 in hawaii though Nor anywhere near me in New York I believe...
It seems like Sheetz is the one in our area right now. More on the way though
Old 02-22-2011, 08:42 AM
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Found this link


AFDC Ethanol: E85 Fueling Station Locations
Old 02-22-2011, 08:59 AM
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Originally Posted by mongorat427
Damn still no E-85 stations closer than 120 miles round trip to me.


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