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 05-17-2011, 10:45 PM
  #1901  
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Originally Posted by Iam Broke
I see 4.6 to 4.8 sec. stock turbo 60 - 100 mph on the E47 with 5 gpm 50/50 meth. Same with or without the meth at 24* peak advance, just cooling the pistonies.

If he's still in the 5's with E85, there's more to get out of it. He may be maxing out the fueling and not know it. Anything over 60% E at 26 psi boost I start to lose rail fuel pressure and inj duty skyrockets.

His numbers on 93 are pretty close to what I saw, mid 5's.
On full E85 in the Sedan, I am seeing 4.8 sec 60-100's (Not maxing out the IDC)

E47 & E30 I see 4.4-4.6 sec 60-100's on the 2871. (It pulls much harder past 100 than the stocker by far)
Old 05-18-2011, 09:37 AM
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That's the advantage to a bigger turbo, I only hold 20 psi at 6k with every boost table maxed out.
Old 05-18-2011, 12:52 PM
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Originally Posted by Iam Broke
That's the advantage to a bigger turbo, I only hold 20 psi at 6k with every boost table maxed out.
Yeah I have no boost drop at all with the bigger turbo. Its a 60-140mph monster.
Old 05-18-2011, 04:52 PM
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Quote:
Originally Posted by Zooomer
ZZP is already working on, testing and running many FP upgrades for the LNF. This includes a couple different versions of HP pumps. This is what we do with $ invested in ZZP. Buying from ZZP and ZZP alone ensures these types of innovations will continue and be at a level only ZZP is bringing you.


Thats the kind of talk I like to hear about right there.

New products to market that are needed

Old 05-19-2011, 09:03 AM
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Originally Posted by drewbroo
its maxing out on 91 Oct @ 28PSI.... Runs great on the E30 blend!

Wonder what Full E on low boost would do?
You have a new file and I turned the DALs down 10%. Should still boost 26-27 psi and hopefully not shock the HPFP as much.
Old 05-19-2011, 09:26 AM
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If you remove that hard immediate hit of boost and ramp it up just a lil smoother, it DOES help. Also, not sure if you saw my comment about the Injector Constant.. but play more there
Old 05-19-2011, 11:03 AM
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Originally Posted by BYT*SS*TURBO
If you remove that hard immediate hit of boost and ramp it up just a lil smoother, it DOES help. Also, not sure if you saw my comment about the Injector Constant.. but play more there
I did but it is on gasoline so I left the injector constant stock because he is on gas. I could take out 15% in the MAF calibration and offset it with a 15% change to the injector constant but I see no point because it is accomplishing the same basic thing telling the injectors to spray more fuel for a given airmass. Also I have already taken out 26% from the stock MAF calibration due to the MAF relocate causing -27% fuel trims on the average and I dont want to have all the cells reading the same values LOL.
Old 05-19-2011, 01:51 PM
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Yeah think my exhaust manifold might be cracked or the gasket needs to be replaced. Strangely though it holds full boost, and I just hear the exhaust leak at tip in.
Old 05-19-2011, 01:58 PM
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Originally Posted by drewbroo
Yeah think my exhaust manifold might be cracked or the gasket needs to be replaced. Strangely though it holds full boost, and I just hear the exhaust leak at tip in.
Wouldn't your AFR's be going crazy if the exhaust manifold was cracked?
Old 05-19-2011, 02:31 PM
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Originally Posted by HHRSSouth
Wouldn't your AFR's be going crazy if the exhaust manifold was cracked?
no it wouldnt change his afr but he might get a lean at idle code like i did when i have a leak in my manifold
Old 05-19-2011, 02:34 PM
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Originally Posted by HHRSSouth
Wouldn't your AFR's be going crazy if the exhaust manifold was cracked?
They seem fine, I can't feel a leak around it. Its a tiny tiny leak.

Anyone have a spare exhaust manifold?

Last edited by drewbroo; 05-19-2011 at 02:34 PM. Reason: Automerged Doublepost
Old 05-19-2011, 02:37 PM
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Originally Posted by drewbroo
They seem fine, I can't feel a leak around it. Its a tiny tiny leak.

Anyone have a spare exhaust manifold?
Maybe its coming through your wastegate or something? If it only happens at tip in maybe there is a leak somewhere... I dunno just an idea
Old 05-19-2011, 02:38 PM
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Originally Posted by drewbroo
They seem fine, I can't feel a leak around it. Its a tiny tiny leak.

Anyone have a spare exhaust manifold?
i do actually
Old 05-19-2011, 03:26 PM
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Quick question just cause I wanna make sure. Any of you on the 2871 have to adjust the WG at all from the way it arrives from BNR? I wouldnt think so but just wondering before I throw it on this weekend.

Originally Posted by FF_ace
i do actually
Did you ever fix your small timing issue?

Last edited by cubaniche; 05-19-2011 at 03:26 PM. Reason: Automerged Doublepost
Old 05-19-2011, 03:53 PM
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Don't you have to drop the motor down to get to the exhaust manifold bolts?
Old 05-19-2011, 04:54 PM
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Originally Posted by cubaniche
Quick question just cause I wanna make sure. Any of you on the 2871 have to adjust the WG at all from the way it arrives from BNR? I wouldnt think so but just wondering before I throw it on this weekend.



Did you ever fix your small timing issue?

Brian set mine via air compressor when I picked it up.
Old 05-19-2011, 05:12 PM
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Originally Posted by cubaniche
Quick question just cause I wanna make sure. Any of you on the 2871 have to adjust the WG at all from the way it arrives from BNR? I wouldnt think so but just wondering before I throw it on this weekend.



Did you ever fix your small
timing issue?
Ya the sprocket on the crank was flipped backwards its all good now
Old 05-19-2011, 06:14 PM
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I am going to check the 13mm bolts from the exhaust manifold to turbo tomorrow. Mike just had to re tighten his because of the same issue, I will do it tomorrow.
Old 05-19-2011, 06:27 PM
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Originally Posted by drewbroo
I am going to check the 13mm bolts from the exhaust manifold to turbo tomorrow. Mike just had to re tighten his because of the same issue, I will do it tomorrow.
That sounds about right. I checked mine after I did the 2860 a week later and they def needed to be turned a bit more. I guess the heat cycling loosens them up a bit.

Originally Posted by HHRSSouth
Brian set mine via air compressor when I picked it up.
So is that a no then? lol Im guessing they are pre adjusted when he sends them out.

Last edited by cubaniche; 05-19-2011 at 06:27 PM. Reason: Automerged Doublepost
Old 05-19-2011, 06:30 PM
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Originally Posted by FF_ace
Ya the sprocket on the crank was flipped backwards its all good now
Awesome man. Glad to hear it
Old 05-20-2011, 01:37 PM
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through process of elimination and baby powder, its on the manifold. On the bright side of research and development. The ZZP Silicon Intake elbow and stock airbox works great on this turbo. No collapsing.
Old 05-20-2011, 02:00 PM
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If the manifold was cracked it would be more laggy then normal. You will also have trouble running higher boost.
Old 05-20-2011, 02:24 PM
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Originally Posted by BYT*SS*TURBO
If the manifold was cracked it would be more laggy then normal. You will also have trouble running higher boost.
I dont think its cracked, I think it might back backed its way out a little bit. It is a bit more laggy, (barely) but its holding high boost fine. I am going to get it on a lift and see if I can pull it off without having to take everything off again. Have you seen any cracked LNF manifolds? Just curious, I never hear about this.
Old 05-20-2011, 02:30 PM
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Originally Posted by BYT*SS*TURBO
If the manifold was cracked it would be more laggy then normal. You will also have trouble running higher boost.
I second that ^
Old 05-20-2011, 02:35 PM
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We need a ninja smilie here.. LOL


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