Topic: BNR 2871 Flutter

[JoshMcMadMac]

I have had the BNR2871 on the Sky for quite some time now.  It has not been driven a ton this year, and I have been fiddling with it trying to get it 100% ironed out.  I have the BNR2871, GMPP intake, Fujita intercooler pipes, Hahn recirc BOV, OCC, and a high-flow cat.

Despite playing with the tuning and adjusting the BOV all over the place, the turbo flutters on any shift with more than a few pounds of boost.  I am also getting a "P2261 - Turbocharger Bypass Valve - Mechanical" code, which I would think makes sense.  I am sure that the vacuum lines are all installed properly, as I have checked them repeatedly based off of the instructions Dave was kind enough to share.

I am guessing it is an issue with the BOV, but am looking for any additional insight or ideas before I start troubleshooting with the wallet. 

[Critterman]

Elff you are being paged.

[JoshMcMadMac]

Elff you are being paged.

I know he has the BNR turbo...did he have similar issues?

[Critterman]

I believe he has all of his worked out, but I will let him speak for himself.  You will have to listen very closely as he is really close to the ground and hard to hear if you are over 5' tall. 

[elff]

Did someone say Cookie?

[elff]

Josh

It is definitely the BOV.  I ran into the P2261 - Turbocharger Bypass Valve - Mechanical" with the Synapse every time I tried to put on the Anti-Stall kit.

How does the Hahn kit adjust it's sensitivity.  It probably needs to be put on the lightest setting.  Can you swap springs?

Also
Would you mind taking a picture of your engine bay.  I was curious on how that connects to everything with the 2871 as the elbow off the turbo is silicone

Thanks

[JoshMcMadMac]

Josh

It is definitely the BOV.  I ran into the P2261 - Turbocharger Bypass Valve - Mechanical" with the Synapse every time I tried to put on the Anti-Stall kit.

How does the Hahn kit adjust it's sensitivity.  It probably needs to be put on the lightest setting.  Can you swap springs?

Also
Would you mind taking a picture of your engine bay.  I was curious on how that connects to everything with the 2871 as the elbow off the turbo is silicone

Thanks

The Hahn screws on/off to adjust sensitivity.  I need to contact them on replacement springs; this one appears painted yellow, which is typically to identify the spring rate.  It does seem pretty stiff, but I figured it would be right since it was designed for our stock turbo.

I will do my best to get a picture or two for you.  The silicone connectors are custom from Hahn to have the holes for the BOV.  What are you using for a BOV now?

[JoshMcMadMac]

Actually, here are a few pictures on their website.  Let me know if you would like anything more specific.
http://www.turbosystem.com/New_Folder/SolsticeGXPRedline/GXPRedlineBOVUpgrade.htm

[elff]

I would specifically like to see it connected to a 2871 as it is different than a K04.

I have a Silcone elbow connecting to my 2871 vs the Metal Elbow that came stock with the car and bolted to the K04.

I have the Synapse BOV mounted to my Driver side IC Pipe but have been considering the Hahn kit due to its recirculation

[JoshMcMadMac]

I should be able to grab pictures as lunch, as long as I remember.  It is set up just like it would be stock; I just added a 2" to 2.5" 90º silicone adapter from the turbo and a 2.5" metal coupling to tie it to the Hahn connector.

[Dr. Gronk]

I have the Hahn BOV, (full Hahn S20g system) when Hahn tuned it for boost into the 20's it was cranked all the way tight and backed off one turn. Though I still think it might be opening up for high psi, and I get flutter as well. Did you open the BOV right up? I was a little hesitant to do so. It seemed like Bill jr rejoined the forum, maybe he can weight in as well.

[JoshMcMadMac]

I have the Hahn BOV, (full Hahn S20g system) when Hahn tuned it for boost into the 20's it was cranked all the way tight and backed off one turn. Though I still think it might be opening up for high psi, and I get flutter as well. Did you open the BOV right up? I was a little hesitant to do so. It seemed like Bill jr rejoined the forum, maybe he can weight in as well.

I tried it backed off quite a bit, and it definitely still fluttered down low in the boost.  It may not have fluttered on higher boost, but I am not certain.

Elff, hopefully these help.

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[Dave@DDMworks]

I tried it backed off quite a bit, and it definitely still fluttered down low in the boost.  It may not have fluttered on higher boost, but I am not certain.

Elff, hopefully these help.

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Also, who is doing the tuning on the car? There are some settings that can be changed with HPtuners when it comes to activating the BOV. The idea about changing springs is an option also, let us know how it goes.

Thanks,
Dave

[JoshMcMadMac]

Also, who is doing the tuning on the car? There are some settings that can be changed with HPtuners when it comes to activating the BOV. The idea about changing springs is an option also, let us know how it goes.

Thanks,
Dave

David (term2)

[Dave@DDMworks]

David (term2)

Well then, you are in very good hands The spring option might be your best bet.

[elff]

TOO MANY DAVES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


Josh
Thanks for the Pictures.
I'd have to cut both my GMPP Intake and my Passenger IC Pipe, but the connection to the turbo isn't any different than how I have mine.

I like that.

You need to add a Devil Mod Sticker on top of the GMPP Shield.

[miller11386]

I have the Synapse BOV mounted to my Driver side IC Pipe but have been considering the Hahn kit due to its recirculation

If you want to recirc the bov, why not just get the recirc fitting and pipe it into your intake after the maf? I have one sitting here if you need it. goes on the front of the bov and is attached with a set screw. It even has a gasket in it to help seal it up well. I never used it. This is the setup that the yellow evo has. Works awesome, and really quiets down the bov noise. Similar to covering your sneeze vs sneezing like a heathen.

[elff]

With the Synapse Recirc fitting I would have to weld a flange to my existing intake and then run hose between the 2.
That will be a small Pita for the work, and would make the engine bay not as clean as I prefer.

The Hahn setup is much more compact and slick. 

[miller11386]

With the Synapse Recirc fitting I would have to weld a flange to my existing intake and then run hose between the 2.
That will be a small Pita for the work, and would make the engine bay not as clean as I prefer.

The Hahn setup is much more compact and slick. 

IMO the synapse is a better valve compared to the hahn. I would stick with the synapse if you really wanna recirc.

VTA the tial Q and synapse synchronic have both proven to be great valves. However I am thinking that the hahn valve is not large enough/ doesn't actuate accurately enough on the upgraded turbo and that is the problem the OP is running into with his codes. Much the same as you (and I) had issues with the anti-stall piece after the 2871 upgrade. I ran the anti-stall for almost a year on the stock turbo with no issues, but when I upgraded and turned up the boost, the restriction was enough to set codes.

[GASNGO]

I too had the Hahn BOV setup on my 08 Redline equipped with the DDM 2871 turbo.
The Hahn BOV would flutter at high rpm when boost was set over 18 to 20 lbs.
It didn't matter where you had it adjusted.
Replaced it with a Synapse and problem solved.
With a little finagling I have the Synapse BOV installed in the Hahn hoses so it recirculates the blow off air.
Jerry

[elff]

That sounds interesting.
Can you post pics?

[JoshMcMadMac]

That sounds interesting.
Can you post pics?

+1  GASNGO, are you running the anti-stall on the BOV?

Miller, are you selling the complete Synapse, or just pieces of it?  It might be worth trying it out if it can be plumbed up in the silicone I already have.

[elff]

You can not run the anti stall and the recirc fitting at the same time, and you would not need to.
The anti stall is used if you want to avoid recirculating the blow off on a MAF
Problem is, the antistall does not work with our cars.  You get the same code you are currently receiving.

With a good tune, it's really not an issue.  I am just being a perfectionist.   My setup runs fine.

[miller11386]

+1  GASNGO, are you running the anti-stall on the BOV?

Miller, are you selling the complete Synapse, or just pieces of it?  It might be worth trying it out if it can be plumbed up in the silicone I already have.

I just have the pcs parts. I sold the BOV with my turbo kit. As far as the anti-stall valve, I really like the sound it made, and it worked fine on an untuned stock turbo car. I only ran into issues when I upgraded to the 2871. The anti-stall gives you a slight "fluttering" sound w.o actual flutter.

I basically have everything BUT the BOV itself. Shoot me a PM, I am willing to sell any pcs that you need.

[elff]

Josh

I did notice one thing in your setup

One your OCC
Why is the Site window so High and horizontal?
doesn't that defeat the puporse of showing how much oil is in the container?