Hope somebody can help me!,
I have installed a MRT inletpipe,and now i canīt keep my boost down :-?
Before on the OE pipe i was runing 1,2bar tappering to 1,15bar,and i was always rock steady.
Now no matter what i do the boostcontrol, on the linkecu, when it gets to around 4500 rpm the boost just rises to 1,4bar :roll:.
I have just ordered a 1,0bar actuator to see if i can do any thing(if it dosenīt no problem).

Anyone got a cure for this???

Thanks for all info

Skassa

 

Port the wastegate.
Run higher boost.
Clip the turbine.
Restrict the exhaust.
Actuator (unless it is binding - unlikely) is unlikely to help. Stronger one will obviously make it worse.

Recommend the first or second. If it creeps to 1.4 it would probably be quite easy to control at 1.5 or 1.6 bar.

 

Boost creeps' usually associated with too small a wastegate port - in that even when the wastegate is fully open the gasses can't escape fast enough to controll the spool up of the turbo - so consequently on full throttle it constrantly gains rpm so the boost creeps up.

Generic solutions for this include:

1) Porting out the wategate orifice (don't know if there is scope for this on the scoob)

2) External wastegate - best solution but can be expensive.

3) downpipe with separate wastegate / exhaust pipes to control restrictive after turbo turbulence.

When you say inletpipe - do you mean downpipe (after turbo) or inlet into turbo - just had a look at MRT's site and they only seem to do a downpipe.

The reason I ask is that if it's the down pipe I could understand this is a possibility if either it's fowling somehow the wastegate and not letting it open properly, or causing so much turbulence that the flow through the wategate is retricted - both seem unlikely though if it's a quality part.

I'd fist investigate if any damage was done to your wategate actuator / wastegate itself during fitting that may be preventing proper opening.

Also check that you've not got any hoses disconnected ie (boost controll solenoid etc etc).

Sorry this does not really answer your problem as such but it sounds more like you've introduced a fault somewhere rather than it being a side effect of a new pipe (inlet or otherwise).

 

Can't beat a dremmell for wastegate porting - just don't get carried away.........

 

Anyone got pics of what to take when you port your wastegate??


Can someone tell me why a inlet pipe can course boostcreep(i just dont understand how this can change so much)

Thanks
Skassa

 

Inlet pipe allows you to flow more air for the same MAP. More air in engine = more power = greater volume of exhaust gas = unable to flow through additional air through wastegate?

 

Hmm

Maybe i need to be signed up for a TD05

I would really like to see what a ported wastegate looks like

Skassa

 

I'm prepared to run some tests for you Skassa. Sell me that inlet pipe (REALLY cheap) and I'll do the testing free of charge.



/J

 

LOL .
We can just switch part,you send me the TD05 and iīll send you my inletpipe

Skassa

 

Do any of You guys have pics of a portet wastegate or a really good DIY Text that i can use?

Thanks

Skassa

 

Can confirm what John says about running more boost.

My car running standard map (boost coming in on WOT at 0.9bar) will boost creep from 0.9bar up to fuel cut in 4th.

My car running scoobyEcu (boost coming in on WOT at 1.15bar) will hold 1.15bar tailing off to only 1.14bar at redline.

With HKS induction and HKS decatted exhaust

 

Thanks Bob,
I will give it a go today,
My Sens was at 7 i have lowered it to 3 without any changes,
Mw rgm setting was 2900rpm,i have raised it to 3200rpm(will try to raise it more)

Thanks for the info,i will keep my hands off the wastegate

Skassa

 

Skassa, take rpm up to say 3600 and check it (or until its high enough to stop it), then reduce one step at a time until it starts to occur then knotch it back up one. Sens ought to be closer to 3 than 7 which would make it too reactive.

cheers

 

Bob, why by raising the WG RPM value to a higher one will control better boost, doesn't this value tell the LINK ECU when to start controling the boost

Carlos H.

 

Skassa ... trust me. Adjust the wgbase afterwards to blend the boost profile as you may find it pausing as it spools.

 

Agrees with Bob - unless you get the balance of WG BASE, SENS and RPM just so, apparent boost creep can be a real problem. I had it on my car - but a lot of playing around with the controls cured it entirely.

Rannoch

 

Today i have been playing around with all that boost settings and none of it helps,
I have also installed a 1,0bar actuator in case something was wrong with the one one there.
I have notised that my TPS is only on 97-98 when on wot(when my boost was steady,before the inletpipe it was always on 100),can that be the problem??

When i change the rpm point to exlp.4000rpm/sens to 1, it just gets real slow on spool up,and when it comes to 4500-5000 the boost goes to 1,4/1,5bar

iīm now thinging,what happens if the 3-port boost soloniod need to be cleaned/or if itīs broken

Skassa

 

Update!,
Well now i tried disconecting the wastegate so i was sure that it could be wide open and there is indeed not enought flow trought the wastegate,becouse it still goes to 1,4/1,5bar but now at 5000/5500rpm.
My Dp is a openneck so it canīt be that!!!
The Turbo is a IHIvf29.

Do i really need to buy a new turbo to get this to work??
Or can it be portet without ruining the turbo.

Andy F when do you have TD05 in stock???

Thanks for all Your inputs

Skassa

 

probably you will only need to port the wg a "little" by this I mean that u will need just to use some sand paper that's all

 

LOL
I think i saw that EMS in Holland had the same on a Vf30 i think??
Anyone know how he cured the problem

Skassa

 

The VF29 is only a version of VF24 or 28, the inlet pipe should not make this much difference, as a thought check your clutch and see if its holding torque ok, even a barely noticeable amount of clutch slip will make this happen.

 

A VF24 crept on an STi5 Type R (not the original turbo) with a Magnex twin dump no matter what we did until we took the Magnex DP off, but we did check before this that there was full movement through 90 degrees of the wastegate. The car was not being mapped and the owner has not tried any other downpipes to see if it is repeated.

All the other VF23/28/29 cars I have been anywhere near have had no such troubles.

 

Thats a typical twin dump effect though John and the VF24 is same as a 28 just a different actuator, Skassa are you running a twin dump down pipe ? Thought you were on an open mouth type.

 

Iīm runing a openneck downpipe!

There is no problem in first or second it holds a steady 1,2bar,and then when you go to third the problem starts

Maybe my clutch is slipping,but i cannot feel it.

The clutch has been feeling a bit strange lately,but then i noticed that the returnspring was missing and when i but it on there was no problem.

The strange part of this is that it startet when i mountet the inletpipe???

Skassa

 

John,
I have tried to remove the wastegate arm so that the wastegate could move freely, and itīs still the same!!

One thing is i do not have a splitter in the Dp.


Skassa

 

Skassa,

If you still have the problem when the Wastegate flapper is fully opened (it should be, if you disconect it from the actuator) then you have to increase the diameter of the wastegate! We did it with succes on the VF35, 2 mm increase was enough there. Look out and make sure the flapper still covers the hole comletely when closed!

Mark.

 

Thanks Mark,
I think that the supersprint manifold also is a big factor here
I have to make up my mind weather to do this to the vf29 i got or to buy a new turbo(TD05)

Thanks for all Your inputs

Skassa

 

Hi All,
I just saw this on the american bbs.
A DIY port the wastegate!!(i case anyone is interestet)
http://forums.nasioc.com/forums/showthread.php?s=&threadid=300296.

Iīm not the only one with the problem

Skassa

 

I just ported the wategate and now my boost control is working perfect again.....

I also ported the exhaust inlet on the turbo ,when i had it apart,
and installed a fpr with the fp set at 3,8bar idle.....,but my 440 injectors are too small 97% dc!!!!!!.

Need to look in to bigger ones

Thank You All for the info

Skassa

 

John Banks,

Quick question re:
"
Port the wastegate.
Run higher boost.
Clip the turbine.
Restrict the exhaust.
Actuator (unless it is binding - unlikely) is unlikely to help. Stronger one will obviously make it worse.

Recommend the first or second. If it creeps to 1.4 it would probably be quite easy to control at 1.5 or 1.6 bar.
"

This chap was running 1.2 dropping to 1.15bar boost. I don't see anything about uprated internals etc, so i am assuming it's standard. Are you really meaning to recommend that someone run 1.5 or 1.6bar boost on a presumably standard engine, as your post implies?

Moray