Low power issue thats bugging me for a year... Seeking help

[ExiledWeegie]

well the chain and tensioner is done, runs spot on, really feels so much smoother and its throwing me back in my seat again, i dont know for deffo if its brough the maf numbers up yet as my laptop is out of charge so ill get on that later and post the results. also managed to do the chain and tensioner without removing timing belt, just cable tied it to the pully tightly, loosened all exhaust cam caps off and the cam popped up enough to get the chain out, then just being carefull to tighten bit by bit to get the cam back down again, all in took 45 mins.

 

[nd-photo.nl]

Thats good news

 

[ExiledWeegie]

well.... the results are hard to understand.

car feels much quicker and smoother now, but the data doesnt show any change with the amount of air going through the maf. this time peak was 164.39g/s with a full 3rd gear wot run.

but the boost is acting a bit funny on my boost gauge i peak at 18psi and hold around 15 psi all the way to red line, but the data says i peak at actual 18.8 psi and then when my maf is pulling the 164.39g/s my actual boost has dropped to 12.1 psi, so thats 2.9psi its showing lost on the data compared to boost gauge and because that extra 2.9psi is lost its obviously limiting how much air is going through the maf so its climbing nicely then boom loss of nearly 3psi.

wether its just data showing this due to some error reporting or it actually is a 2.9psi loss i dont know because the car deffo picks up quicker and holds well, its throwing me back in my seat again and obviously by boost gauge shows im hitting what my stage 2 should see.

 

[nd-photo.nl]

Hmm weird that there is a difference in what the boost gauge is showing vs the data. I would rather trust the vcds data than your boost gauge though. I found some old Torque (android app) screenshots from my MK1.

It was stage 1 tuned when I bought it (didnt know this), and I added a silicone TIP and decat downpipe when I recorded this 176g/s

I replaced the silicone tip with a SFS Overbore / Big Bore TIP and then I recorded even higher g/s (180 g/s). When I got it stage 2 (JD engineering), I let them map out the MAF. I could then run a true BOV instead of a recirculating DV Downside: the TCS will be disabled once you map out the MAF.

Stage 2 dyno readout, we added 7 liters of bio ethanol when mapping it

 

[ExiledWeegie]

ive edited the last post so as not to overinflate the numbers, these now seem to be truer numbers im seeing, ive taken a link for my boost gauge straight from the manifold and not t'd into the dv vac line and seeing a difference in boost but still the same maf numbers.

i dont know if this is correct but...

"your 164 g/s reading is not a sign of a slow car; it is a software calculation illusion caused by your upgraded BAM injectors and modified KRKTE global fuel constant.
Because your mechanical boost gauge proves the turbocharger is delivering a healthy 18 psi peak and 15 psi hold, your engine is physically shifting enough air volume to generate a true 230–240 bhp. The ECU is simply displaying a lower calculated g/s number on VCDS because the fuel injector pulse times are shorter than the stock formula expects."

so according to my boost gauge which reads the same everytime im getting around 1.24 bar (18psi) peak and this drops to 1 bar (15psi) all the way to 5800rpm then drops again to around 0.8 bar (12psi) at red line but still the maf sees a peak of 164g/s.

im deffo a bit lost with this, checked everything and all seems good and since doing the chain it seems to have given it a burst of life now its not -6 degrees retarded constantly.

 

[nd-photo.nl]

Best way to know for sure is to get it on a dyno. The pressures seem to be in line with stage 2, I remember running around 1.3 bar on my RaidHP gauge once it was mapped

 

[ExiledWeegie]

yeah seems like it, all i know now is that its deffo got its kick back and feels much quicker than it did with basically the same maf numbers, so i think i'll leave it right now and maybe get a couple dyno runs at some point see where its at.

 

[nd-photo.nl]

Sounds like a plan, enjoy it my man!