All Things Mk5 > Performance Modifications
VWR Intake disappointing
Shoduchi:
--- Quote from: Pudding on August 09, 2017, 11:28:39 am --- :grin:
The trims were very small with the VWR intake on mine, but that's only half the story. The problem with CAIs is they slow down the air speed. The sensor might still see the correct air mass, within a 5% tolerance, but that change in flow dynamics makes it feel lethargic off boost.
The initial hoorah this is great feeling I got from the VWR must have been placebo, because the car feels a lot better to drive with the OEM airbox :happy2:
--- End quote ---
I think you can only feel the difference on WOT. Other situations you don't get the benefit and I guess you notice more the lethargic response of the engine.
Shoduchi:
--- Quote from: Dan_FR on August 09, 2017, 12:16:46 pm ---I gotta say that comprehensive reply frazzled my head a little..... Couple of points:
@AJP No logging needed, just a check of block 032
How relevant is pressure drop on an airbox that is under vacuum and sees no positive pressure? Genuine question.
A flow straightener has very little effect.... tried one, tried multiple mesh designs as close to the OE design as I could find and it made suprisingly little difference to the MAF readings, trims and feel.
Out of curiousity, where does the MAF sit on the VWR intake, centre or nearer the edge of the tube?
As for gains from an intake, it is impossible to give a static number or % in terms of what can be gained as it depends entirely on the car and hardware setup.... A 500rpm difference in spool could be achieved on a larger turbo setup, but on a punchy little K03 that is hitting peak boost by around 2500 rpm - not a chance.
Gains are there in terms of peak numbers, especially when you are on the limit of what the compressor can flow. There are many back to back dyno charts out there proving the gains from an intake alone on a previously tuned car... But as with everything in life, there are negatives to consider but these are almost always overlooked as the priority for most is to chase peak numbers and full throttle performance...
Noise is another drawback for some, although personally I am 29 going on 19 and love all manner of turbo noises.... What is acceptable to me would not be for a lot... Its all about finding the compromise that best suits you.... Whether you want to chase numbers or enjoy the quiet, refined OE drive
--- End quote ---
My K04 is peaking its boost at 2500 rpm. It's only peaking at 1.4 bar with the ECU requesting 1.24 bar, where it drops after not long.
As I said previously, the noticeable gains happen between the 6.000 rpm to the limiter (mine as increased to 7.000 rpm).
pudding:
Did you get a retune after fitting your intake?
I can see there'd be a gain at the top end as a piece of 3" pipe is easier to breathe through than a baffled airbox, but 95% of the time, people live in the idle to 5500rpm range.
Shoduchi:
--- Quote from: Pudding on August 09, 2017, 01:52:52 pm ---Did you get a retune after fitting your intake?
I can see there'd be a gain at the top end as a piece of 3" pipe is easier to breathe through than a baffled airbox, but 95% of the time, people live in the idle to 5500rpm range.
--- End quote ---
I didn't get a retune yet. The difference in power above 6.000 rpm is just from the VWR intake. If I add an octane booster additive the difference is bigger with the CAI than with the OEM airbox.
I'm still waiting to get one to take full advantage of higher octane fuel. I plan of filling up with race fuel on future track days.
I agree that on daily driving you don't notice anything with the CAI. I didn't feel any increased lethargy from the engine response but I rarely drive bellow 2.000 rpm. I prefer driving at least at 2.000 rpm.
pudding:
You are one of the lucky ones being completely happy with yours :happy2:
Maybe I will hang onto it for when I finally fit the TTE420, but for now, OEM it is :smiley:
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