Austrian Impreza

iTrader: (9)

Hi at all!
I have some problems to set up my AVCR perfectly!
Started to reach a stable boostcurve with 1.5bar maximum, that worked quite good even in the lower gears it was not near this value.
Anyways I set the start duty to higher "+ values" in the lower gears, but I can only get the boost from 4th gear onwards.
There it seems to work near the level I set it up!
Now I even tried to reach boost of 1,7bar from downlow to 5000rpm and tappering back to 1.55bar afterwards.
I tried to set the duty (not startduty!) higher until 5000rpm, but it did not change anything, I can´t reach boost over 1.5bar!
The actuator of the turbo is screwed in and it holds boost fine to redline, but only 1.5bar!
Has anybody an idea what I can do to reach my targets?

I do not have any leaks in the system, all problems solved and I run a STI V8 TMIC with stock V8 BOV and a big turbo, that can deliver this kind of boost for sure!
It reaches full boost at around 4300rpm!

Would be great if you could help me out!
Cheers
Markus

dunx

iTrader: (3)

Ask the JollyGreenMonster... ?

If he's not busy.

HTH

DunxC

Austrian Impreza

iTrader: (9)

Hopefully Simon will see this thread!

I made a testrun yesterday and turned the AVCR off.
The car spooled up as with the AVCR duty set to 90% and reached 1,15bar.

With the setting on and started from new with adjusting it, I was only able to make 1,5bar at maximum, no matter how high I set the boost, even on 1,8bar it did not make more than 1,48bar!

Might the problem be the airfilter (Viper induction cone, without the airram conduct) or the wastegateactuator?
I still pulled the actuatorspring a bit tighter (3turns in) and it seems to be okay as boost comes on strong with or without the AVCR turned on/off) and I reach 1,15bar!
The boost even reaches target with only 25% duty on top!!!
And there is straight boost building like 1,2bar at 4000rpm holding to redline and still going minimal upwards to 1,24bar.

Any ideas?

JimmyBFC

Who set it up and installed it in the first place?

Have you ever used one before?

Austrian Impreza

iTrader: (9)

You mean the Inductioncone?
I installed it myself and secured everything to see if there are leaks and there are none!
The turbo was installed by the best Subaru mechanic in Austria!
I also made sure that there are no leaks yesterday and I was not bale to find one!
Might have to remove the intercooler, but I think there will not be a leak at the pipes below!
At first I have to change the airfilter, I think!
Does anyone use an Viper Inductioncone on a big hp car?

Peanuts

iTrader: (15)

you could always use an apexi induction cone Markus
I used to have one running 1.7bar on an 18g/ej20.

Austrian Impreza

iTrader: (9)

I could do that, if the filter would be in my hands now!
So I have to take another nonamebranded one to see if it works.
Will have to squeeze the fueling afterwards when I change to the Apexi (you sent me) again, well hopefully it´s not that much of work!

JimmyBFC

You know bud, I have an avcr and tbh I wouldn't fvck around with it if I wasn't sure, your best taking it to be set-up properly and set to what you or the mapper are happy with, its your engine your playing about with, I wouldn't bother with learn mode as it isn't up to much anyway tbh.

Peanuts

iTrader: (15)

Good advice ordinarily Jimmy, but Markus is not a complete beginner and the options in Osterreich aren't as plentiful as they are here.
Needs must.
Self learn is actually pretty good as a base to start from

Austrian Impreza

iTrader: (9)

Thanks for the answers, I really seem to know what I do with the AVCR and I thought I missed anything! It all works perfect until I hit the magic level of 1,5bar in 4th gear.
In 5th I can reach 1,63bar!
But I never really come to this level on the quartermile!

Thanks Andy for the explaination of my situation!
I´m really happy that Alan helps me so often, thanks as well!!!

AL99

iTrader: (1)

youre welcome,

Austrian Impreza

iTrader: (9)

Seems as I have to change to the Apexi cone at first and see how it behaves.
Afterwards maybe the exhaust is a restriction, I use a 3" bellmouth DP and stock middlesection with an freeflowing rearmuffler (branded "Laser").

I was able to get boost near to 1,7bar in 5th on the highway, but in the low gears where I need power on dragraces there are only 1,35-1,5bar to reach!

The STI V8 TMIC can´t be a restriction in this way, isn´t it?
I do not want to change to a FMIC (only in the worst way I would do this) as I want the car to be as "stock-looking" as possible!

jaytc2003

iTrader: (1)

you will not get the full boost in your lower gears as your car is accelerating too quickly and you will simply be changing gear before the turbo can spool upto the boost that you require

Austrian Impreza

iTrader: (9)

I set the startduty to very high levels and maybe I have to divide 1st and 2nd gear (as I used them both at the first setting due to using a 6 speeder) to make it work better - okay.
BUT I don´t even hit the target in 3rd and 4th gear!
What can cause this problem?

Mad Hammer

iTrader: (55)

Markus,

Are you using a standard inlet pipe or a silcone replacement ? Also what turbo is it ?

Clive

banny sti

iTrader: (68)

It is normally 5th and 6th that behave the same on the avc-r, if using a 6 speed box.

Banny

Austrian Impreza

iTrader: (9)

It´s a 3" Samco inletpipe with a GT35hybrid turbo, so it should make tons of boost and no collapsing of the pipe too!
I use a Viper inductioncone (with the carbone on the side) so it sucks from the front, have to wait for the Apexi cone arriving, to say if this might be the problem!

@Banny: I thought I use 1st and 2nd together to prevent overshooting in 5th and 6th due to using them seperate.
Anyways it´s even in 3rd and 4th where I can´t reach the target!

Mad Hammer

iTrader: (55)

Okay that throws that theory out of the window.

What are you doing with your gain settings ? You need to get the combination of duty and boost correct first. What have you set your start duties at 1st to 5th ?

Austrian Impreza

iTrader: (9)

Due to the turbo beeing that big, it seems to make no difference how I set the duty before 4000rpm, it pulls near as good with the AVCR turned off, as it does with setting B at 90% duty cycle!

I used 45 in 1st gear (in real terms 1st and 2nd together), then 28% in 2nd (3rd) and 10% in 3rd (real 4th) ... (if I remember right)
But I set the startduty up a lot and it did not make a difference.

I also set the overall duty from 30% (on top of the revs where it reached 1,5bar) to 70% and it did not raise above in 3rd and 4th gear, seemed sometimes it even dropped 0.05bar, so I only got 1,48bar instead of 1,54bar!

It´s really a crazy thing and no matter how the setting is adjusted I never get any overshooting of boost, I had this sometimes with the VF28 when I set it up, but here no way to make it peak!

Mad Hammer

iTrader: (55)

Seems you have tried lots of things there so perhaps the filter or standard centre section exhaust is the problem.

Start duties should be something like this for example -

1st +12
2nd +8
3rd +3
4th 0
5th -4

(please note this is just an example)

Take it you have 'learn gear' turned off ? And you have the correct wiring in to the ECU ?

Austrian Impreza

iTrader: (9)

It might be a problem there, but I don´t think the TMIC is something to worry about, as it would begin to knock on more ignitionadvance, but no matter about boost, isn´t it?
I also thought about the settings, there should not be such huge differences inbetween!

Of course I turned off the selflearningmode and it´s wired correct, otherwise it would not work as it does and I was bale to reach 1,8bar on my SR40 before, this was with the other airfilter on (more free flowing).
When I changed it last Friday my settings gone crazy and I had very rich readings over the whole map, shouldn´t it be the other way - more air leaner AFRs? and at least the car pumped rpm from idle to 2000rpm himself, like the neutralswitch is damaged, is always reved up and down to 2000rpm.
I changed the idle rpm and it settled down again but not to 860rpm as dialed in, just in the region of 1100 +/-100rpm.
After I changed all back as it was before the whole map worked well and the idle settles now to 860rpm, but a bit slow (seems as it takes some seconds until it drops really to 860rpm) can this be because of the stock STI Bov?
With the Viper filter in it works now as it did before.

Oh and I tried to setup the MAF curve to many different values, so I would be bale to get stable AFRs over the map with the free flowing filter, but it was imposible it always read 10s on idle, no matter what I set it to (in the map as well as in the MAF table)

Can a bad filter make such a hugh difference?

I have to add that I use a Q45 MAF and calibrated the curve with the Viperfilter!

Mad Hammer

iTrader: (55)

I think some advise from someone more experience from me is required. The filter could be an issue though, you say you were running the SR40 with a different filter ? Can you swop back to the old filter and check ?

I don't think your stock BOV would cause any issues.

Austrian Impreza

iTrader: (9)

It was the filter I was able to boost to 1.8bar I used on my trail and all played crazy!

Slowboy Racing

Making boost in lower gears is not "only" down to your boost controller there are other factors to consider, like Ignition timing, AFR and so on...

The boost controller is secondary to the engines out put.

Turning up the AVCR to the max settings won’t work as you know, I would suggest looking into the above towards and towards the waste gate.

Once everything is set up correct you will find you can make near the same boost in all gears.

Austrian Impreza

iTrader: (9)

Seems as I was able to serve the problem, can´t say for sure now, as my car is at the mechanic, but I got boost of 1,6bar in 2nd at 6000rpm!
I just changed to the Apexicone, which arrived yesterday (Thanks Andy!!!) and the car runs much smoother even with rich AFRs!
Of course I will have to recalibrate the MAF curve, as it ran lean on top and rich lowdown!
Let you know, how it goes, at them moment it is unbelievable that a expensive Viper cone is not able to deliver the air I need like the Apexi does!
Maybe it´s the problem that I had no direct airfeed onto top of the filter, but just in case it should flow plenty of air, no matter if hot or cold!

Austrian Impreza

iTrader: (9)

Bad news again!
The car doesn´t pull over 1.5bar again in 4th.
Only had time and "enough street" to make a WOT run in 4th.
My mechanic said there might be another problem, he is not sure off...but it is not the exhaust he said.
Does anybody have an idea where the problem could come from?
One thing is sure, it´s not the map and AVCR settings!
I used hhigh dutycycles and boostlevels of 1.8bar and no way to make it boost like this!
I had good results and even overspiking until 1.35bar, but when I set it to 1.8bar it did not make any more boost than 1.5bar in the lower gears.
Maybe it will boost up 1.64bar in 5th again, but where is the relation between the gears and boost in this case, as it doesn´t matter what startduty I set it too and what duty overall!

I have got the stock middlesection in, may this cause the "booststop"?
As mentioned my mechanic said NO!

Austrian Impreza

iTrader: (9)

Problem solved due to changing the exhaust for my Trust 3" system from downpipe on. I will change the exhaust back to 2.5" system, whenever the Prodrive middlesection arrives.
I think this will work as good without restrictions as well, what do you think?
Please let me know, if someone makes big bhp with a full decated 2.5" system or if a 3" system is needed!

By the way the car feels very powerful and I think AL99 will squeeze some more power out of it soon as he did on spoolup region!
Many thanks again for your big help Alan!