BNR S4 maxed IWG

[iamareios]

Wrapped up my 100% meth tune and recently dyno'd 397hp on 91, stock block, and s4. I have plenty of fuel headroom to push further but the internal waste gate maxed out on us.
Anyone else with an S4 have a similar experience? Is it time for external waste gate?

[tmillner]

We were having trouble with boost control at initial spool up.

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[iamareios]

Originally Posted by tmillner We were having trouble with boost control at initial spool up. Sent from my SM-G935P using Tapatalk

Hmm interesting. I've never had a problem with that and I have been running the s4 for quite awhile now.

[tmillner]

It would spike pretty quickly. I'll look over my logs when i get home for a better explanation

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[tegxsi]

Try adjusting WGA arm?

[iamareios]

Originally Posted by tegxsi Try adjusting WGA arm?

That's one idea I thought of but have no clue how to. How many turns or threads effectively do I turn it? Inward or outward?

[tegxsi]

Originally Posted by iamareios That's one idea I thought of but have no clue how to. How many turns or threads effectively do I turn it? Inward or outward?

I believe you would want to increase the tension on the arm so you will want to shorten it.
Maybe start with one turn, re-tune, and go up from there.

edit: BNR S3 WGA adjustment
BNR Stage 3 WGA adjustment

[iamareios]

Originally Posted by tegxsi I believe you would want to increase the tension on the arm so you will want to shorten it. Maybe start with one turn, re-tune, and go up from there. edit: BNR S3 WGA adjustment BNR Stage 3 WGA adjustment

excellent. seems straight forward enough. thank you

[pwdunmore]

datalog19.csv

Is this the boost control on spool up issue you were talking about? @tmillner;

This was my last log in October before I stored the car for winter.

[Jeff23spl]

what do you mean by wastegate maxed out ? you reach 100% duty ?
The WG is only there to reduce turbo boost when there is too much exaust flow for the boost pressure you want. When the gate is already closed, there is nothing an EWG can do for this. The EWG would help reduce boost creep and release some flow restriction in the piping when the wg is operating (Duty bellow 100%) But by your graf, you aren't creeping at all...
I would rather check the mecanic of the WG and your EBC connection and vaccuum rooting...
A weak WG arm will let the gate open and waste some exaust energy. It will increase spool and reduce boost capacity a lot.
I got that issue after put it back after a paint job...I made it a little bit tight at cold but it was not enough when hot...

How are you controlling it and how are you piped ? Usually BT need a 3ports EBC and it would be limited to boost about twice the WG spring rate. If you try to reach 30psi with a 7psi spring you may never get it...

The oem 2port solenoid works with a restriction pills, if you keep that setup for a BT without the pills, it won't work either...

[tegxsi]

Originally Posted by pwdunmore Attachment 230176 Is this the boost control on spool up issue you were talking about? @tmillner; This was my last log in October before I stored the car for winter.

I see it boost and WGDC oscillating... maybe boost/load error compensation tables are too aggressive.

[iamareios]

Originally Posted by Jeff23spl what do you mean by wastegate maxed out ? you reach 100% duty ? The WG is only there to reduce turbo boost when there is too much exaust flow for the boost pressure you want. When the gate is already closed, there is nothing an EWG can do for this. The EWG would help reduce boost creep and release some flow restriction in the piping when the wg is operating (Duty bellow 100%) But by your graf, you aren't creeping at all... I would rather check the mecanic of the WG and your EBC connection and vaccuum rooting... A weak WG arm will let the gate open and waste some exaust energy. It will increase spool and reduce boost capacity a lot. I got that issue after put it back after a paint job...I made it a little bit tight at cold but it was not enough when hot... How are you controlling it and how are you piped ? Usually BT need a 3ports EBC and it would be limited to boost about twice the WG spring rate. If you try to reach 30psi with a 7psi spring you may never get it... The oem 2port solenoid works with a restriction pills, if you keep that setup for a BT without the pills, it won't work either...

I'm running a JBR EBCS in 3 port. Piped? I have a catted CNT DP to a OBX catback exhaust. I had a high flow resonator welded in the mid pipe. It's definitely flowing well. I think my problem is the WG arm as people are suggesting. My tuner says don't adjust it though and be happy with how things are??? Nonetheless it is respectable power on stock block and i'm pretty satisfied.

It's weird though, after the 1st dyno pull the ecu dialed the tune back a little it seems. It wasn't hitting boost targets after that. Also things get a little odd looking in the high RPM range according to my dyno graph I posted. This has happened two times on two different dynos. The 1st dyno operator suggested I had a "engine grounding issue" Whatever that means...

[MD1032]

How do you know the IWG flapper is blowing open? I don't see any sudden changes in power in the dyno graph to suggest this is happening.

[shamie]

3 turns is the universal suggested WG arm tension.

Set the arm length so it just connects to the lever then 3 full turns shorter should put the proper preload on it.

[specvspeedfreak]

that's really good numbers for 23psi... I had to do 5-5.5 turns just to peak 24.9x psi... Bryan sent me a stiffer IWG but I just ended up keeping the one it came it.

FYI.. My setup it similar minus the manifold and catted CBE.

[iamareios]

Originally Posted by specvspeedfreak that's really good numbers for 23psi... I had to do 5-5.5 turns just to peak 24.9x psi... Bryan sent me a stiffer IWG but I just ended up keeping the one it came it. FYI.. My setup it similar minus the manifold and catted CBE.

No doubt. The car feels amazing. I'm completely satisfied with it. Went for a spirited drive today and it became evident stock suspension with 98k miles isn't going to cut it anymore. How do you like the B8's and swift springs?

[specvspeedfreak]

Originally Posted by iamareios No doubt. The car feels amazing. I'm completely satisfied with it. Went for a spirited drive today and it became evident stock suspension with 98k miles isn't going to cut it anymore. How do you like the B8's and swift springs?

Get it... You will love it.. I replaced it with Mazdaspeed (essentially KW3) coilovers though...If I had to do it over again, I would of kept the B8/Swifts...

[iamareios]

Originally Posted by specvspeedfreak Get it... You will love it.. I replaced it with Mazdaspeed (essentially KW3) coilovers though...If I had to do it over again, I would of kept the B8/Swifts...

I ended up with koni yellows in the front and bilstein b8's in the rear since I wont need adjustability. I picked up some used cobb springs for a mild drop and slight increased spring rate. Do you know if front bump stops are needed on koni yellows with that mild of a drop? I know the B8's have an internal stop design.

[anavrinIV]

Originally Posted by iamareios I ended up with koni yellows in the front and bilstein b8's in the rear since I wont need adjustability. I picked up some used cobb springs for a mild drop and slight increased spring rate. Do you know if front bump stops are needed on koni yellows with that mild of a drop? I know the B8's have an internal stop design.

Konis absolutely need front bump stops

[impossible]

You'd gain some hp just by going with a real intercooler.

[iamareios]

Originally Posted by impossible You'd gain some hp just by going with a real intercooler.

No way? Cool

[iamareios]

Originally Posted by anavrinIV Konis absolutely need front bump stops

On it. Ordered some dust boots and stops from rockauto. Along with some "FEBI" VW bump stops for the rears.