[Octavia VRS misfire]

Don't put atmo blow off valve to 1.8T, it's designed to work in closed loop.

If you want to keep position of DV as it is now, just reverse it or put it on TIP like it is now installed.

[Octavia VRS misfire]

Your OEM DV is connected in reverse, it should be rotated by 90 degrees 

[boost pressure drop in 3rd 4th 5th around 5000rpm]

Bad fuel pump

[boost problem heeeelp!]

Authorized Skoda/VW dealer have a fuel pressure tester. Measure it and post back the results. Also pressure test the boost system for leaks.

Do you have a boost gauge?

[1.8T 150/180bhp differences?]

Three type of 1.8T engines where in mk1:

 

AGU - 150hp K03 non-DBW -> stage 1 cca 170hp

AUM - 150hp K03s DBW -> stage 1 cca 205hp

AUQ - 180hp K03s DBW -> stage 1 cca 205hp

[VRS issues at 3000rpm]

Log MB 015&016, misfire counter, via vagcom.

Value should be in all blocks 0 or 1, if its start to rise usually coil pack/packs are on its way out. 

Testing should be done in 3rd or higher gear, from 2000rpm and up.

[S3 INJECTORS]

Better spray pattern with the BAM injectors apparently. Is the standard lambda sensor clever enough to cope with a hike in injector capacity?

 Yes it is, s3 uses the same wideband lambda sensor but also has EGT sensor which octavia doesn`t have.When egt starts to rise ECU dumps more fuel to cool down the motor.

[S3 INJECTORS]

Yes they need mapping,use stock rail and 3 bar fpr. No need for 4 bar fpr, if you need more flow than s3 injectors can provide it`s better to use 440cc green tops.

[S3 INJECTORS]

TT and S3 injectors are the same, injection time doesn`t go over 20ms or 80% IDC, that`s why they are better. 

[S3 INJECTORS]

I do 

[Dyno results, disappointing and confusing, any ideas?]

You say DV (spring stiffness)  is the problem, can you tell how much boost you have @3500rpm and @5500rpm?

Wouldn`t be logical to presume that DV is not the problem, if it can hold 1.2bar@3500rpm but can`t hold 0.7bar@5500rpm?

Maybe I`m wrong 

[Dyno results, disappointing and confusing, any ideas?]

Sytec p3031.1 fuel pump, it`s a good upgrade.

You should log block 031 and see what is going on with AFR, I bet it`s leaning out at higher rpms, also causing boost fluctuation.  

[Dyno results, disappointing and confusing, any ideas?]

How old is the car? 10-12 years? 

I bet it`s a fuel pump 

Flat line after 5000 to a red line indicates fuel issues, clogged injectors or/and failing fuel pump.

Buy this: http://www.motorsport-tools.com/sytec-hi-in-tank-fuel-injection-pump-36mm-in-8mm-out-p30311.html 

[LPG VRS Smells Of Gas Inside In The Mornings?..]

Wot LPG system u got mate?

 

My Subaru Legacy 3000cc 242bhp 6cylinder never missed a beat on BRC LPG :-)

Landi Renzo Omegas system

[LPG VRS Smells Of Gas Inside In The Mornings?..]

6 years on LPG with no problem, 1.8T Stage 2 (225hp, 372Nm).

[Best gauges for closest match to dash]

ebay, this one; http://www.glowshiftdirect.com/Tinted-7-Color-BAR-Boost-Vacuum-Gauge.aspx

[Best gauges for closest match to dash]

I have glow shift boost gauge with green light, work perfectly over 5 years.

[To much boost or not?]

K03s? 1.8Bar?  :wonder: 

[4 bar fuel pump question?]

Does the fuel pump not run at a constant speed, it does in my Audi. The fuel which is not needed by the injectors is pumped back to the fuel tank by the same pump. So the pump in effect always runs at a speed to supply sufficient fuel for full throttle, returning unused fuel back to the tank.

 

It would run at the same speed (flow) if the pressure is constant which isn`t  , pressure in the fuel rail is. When the pressure rises fuel flow drops and vice verse. 

[when does the turbo start to fade out on these standard?]

my vrs holds 0.9bar@6300rpm on 100 octane fuel and 1bar@6300rpm on LPG in 5th gear

[Requested boost vrs actual boost]

stock boost is 0.7bar for AUQ engine

[4 bar fuel reg...]

+1

 

some mappers like REVO map the 4bar FPR into their stage 2 mapping and change the duty cycle of the injectors.

+1 

 

Just to add, if its not maped right ECU will decrease the flow by the same amount which you can check by logging block 032.

[4 bar fuel reg...]

The best and proven combination is BAM injectors+3 bar fpr+LCR fuel pump 

If you go 4 bar fpr route you can expect big problems with irregular flow through the rpm range because by increasing pressure maximum fuel flow drops. Example; @3bar flow is 135LPH but @4bar is 105LPH and also boost pressure plays here big part in equation. @5000rpm stage 2 usually sees 1.2bar, add 4bar base pressure=5.2bar     

[4 bar fuel reg...]

VR6

[N249]

If you don`t map SAI out it will trigger "Secondary Air Injection Pump - Incorrect flow detected" error. This is caused by no flow of air through the combi valve which wideband lambda detects in first 2min.