Can someone explain my dyno results? PICS

[blue_reality]

Quick update.

Have made my GFB fully plumback. (The Hyrbid BOV can either vent 50% or you can screw in a cap blocking the atmos port which then recirculates 100%)

Haven't dyno'd it but just did a run and boost is still the same (max 13psi) and it is still losing boost as it revs out (havn't dont a 3rd gear full boost 150km/hour run like the dyno run) but car feels exactly the same as when it was venting 50%.

Is there any different between a DV valve and a 100% recirc Blow Off Valve or are they two different names for the same thing?

Any is it possible that the actual blow off valve enclosure leaks?

[fuzion]

Quick update.

Have made my GFB fully plumback. (The Hyrbid BOV can either vent 50% or you can screw in a cap blocking the atmos port which then recirculates 100%)

Haven't dyno'd it but just did a run and boost is still the same (max 13psi) and it is still losing boost as it revs out (havn't dont a 3rd gear full boost 150km/hour run like the dyno run) but car feels exactly the same as when it was venting 50%.

Is there any different between a DV valve and a 100% recirc Blow Off Valve or are they two different names for the same thing?

Any is it possible that the actual blow off valve enclosure leaks?

have you checked your boost hoses? (intercooler, tip etc)?

disconnect your maf, go for a drive around the block and see what it comes up to ..b lock your n75 valve hose (kink or something, just dont break it) then go for a run and see again?

[SoVeReIgN]

Is there any different between a DV valve and a 100% recirc Blow Off Valve or are they two different names for the same thing?

Any is it possible that the actual blow off valve enclosure leaks?

No difference, I don't know why some people here call them DVs (diverter valve) when the rest of the world calls them plumback bovs.

Yeah it is possible, I don't know about yours but most BOVs have an adjustable spring (and a piston that needs to be oiled), if the spring is set too losely then it will bleed off air prematurely.

Tighten it up if possible, iirc the check is to see if you can see the pison hovering around inside it while the engine is on, it shouldn't be moving at idle.

Agree with Piere, disconnect your MAF and see how it goes, and try reseting your ECU - Turn car off, unplug your batt, tap the brakes, let sit for 5minutes and plug it back in and see how she goes.

[SoVeReIgN]

dave, maybe because i have more mods? who knows.
what did you dyno at anyhow? as your 24psi from sig, im only 18/19!

Maybe you need a BOV

I haven't dynoed it since that day it made 125kw, and I've done some more work since then.

[h100vw]

Boost should be on the side of the piston and therefore not going to lift it off it's seat.

I don't see how one could leak internally, certainly not enough to be noticeable.

VW call them DVs why wouldn't we, it doesn't blow off so BOV isn't correct.

Gavin

[fuzion]

Maybe you need a BOV

I haven't dynoed it since that day it made 125kw, and I've done some more work since then.

nice nice! just dont put big wheels on lol.. i speak frmo exp! hahah.

[blue_reality]

This weekend I'm going to spend a day checking all boost/vacume lines and cleaning MAF and testing for leaks. If I don't come up with anything concrete I think I'm just going to have to take it to a shop and say: "I'm down on boost, I'm down on power and car is running rich - fix it"

Though how much that process actually costs is the bit that worries me

[Nafen]

Have a search of all the dyno sheets round this forum and others, you will see the same thing, they all bleed back boost as the rpm climbs as the pissy little turbo cant keep up.
The AFR's on the other hand as mentioned are more of a concern.

[blue_reality]

Fixed! Took the car back to Peak who did the original tune and this is what they did:

Replaced leaking hose on the manifold.
Changed blow off valve to an S3 DV Valve
Re-aligned throttle body (had a fault code coming up)
Remapped the revo tune.

One, some, or all of the above could have been the culprit but the car is now feeling amazing.

Pulling hard all the way through the rev range and getting 16psi.

Gotta say a big thanks to Peak Performance because when I wasn't entirely happy with how it turned out they took the car in and spent a considerable amount of time (days!) testing, and trying different options to get the car running right again.

I filmed the whole process and will be uploading a video to the mightycarmods site in the next few days outlining how the tune is done and the dyno run afterwards.

It's good to know everything is working properly as it should and now I can putt to work in the 60 zones knowing that the power that I can't actually realistically (or legally) use is there.

[bujna]

That's good to hear mate. I got my flash done at peak too.

Could you post your latest dyno graphs? It would be interesting to see where the graphs differ...

I just installed my boost gauge tonight. I'm getting ~16 psi after a quick test, but i'll have to do some more testing tomorrow and see when it drops off...

I'm waiting for a stronger (yellow) DV Spring + the n75 Race valve which i should get on Monday (They got to Sydney yesterday...sigh)...then i'll be ready to jump on the dyno again too.