@99hagued Yeah it is shocking. I'm not impressed with the VWR intake at all, probably one of the worst on the market for fitment, but also the most expensive. It does OK on the fuel trims though after they shoved a sleeve into it. Apparently VWR weren't interested in resolving the problem until APR got involved.
@Dave J Makes me laugh. It's like a double glazing company selling you some upgraded windows made-to-measure for your house, but you have to bash half the bricks away to make them to fit. It's forgivable if it's a beta product, but even after APR got involved 6 years ago, it's STILL a beta product!!! There is a rumour circulating that they are working on a improved design. If it's true, they need to offer the revised version to existing customers at a massive discount!
@Dan_FR Don't worry, I'm not giving up yet. I got over myself today, did an oil change and threw the Revo intake back on whilst I was there, but with the ghetto sleeve from the VWR intake shoved up it's hole this time. It's a section of 1mm wall thickness stainless pipe, which is naturally springy and holds itself in place no problem. It drops the diameter down to 63.5mm, so near as dammit stock diameter.
I reset the trims and went out for a test run. After 50 miles, this is what I got. Much, much better
Without the ghetto mod, the trims would shoot up to 8-9% within 30 miles, so this is very encouraging. I will give it a couple of weeks and see where they settle at. Big improvements in idle quality too. A couple of flat spots (compared to the stock intake) but I'm hoping these will smooth out over time.
Yes in that thread I linked to, I'm sure the CTS pipe is mentioned as being a good one, so I'm glad you've found something that works for you
I'm not completely anti intakes, I just want one that works properly. I really like the Revo for it's one piece pipe and a few other bits. No silicon joiners which can create steps in the air flow and introduce turbulence. They kind of knew what they were doing on the one hand, but made the same mistakes as others on the other hand.
I mean, for example, this MAF mounting is absolutely perfect. VWR's is junk and leaked like a sieve until I corrected it.
Lovely smooth transition from 90mm to 70mm
Keeps the airflow happy.
KO4 DV input already built into the pipe. A blanking bung supplied for K03 people. VWR people have to puncture the pipe and fit a fitting themselves
One area that isn't so good with the Revo is the MAF insertion depth. Not even close to central, where the air stream has more velocity. Still, the trims seem to be OK at the moment so I will see how it pans out.
For comparison, VW's MAF insertion depth. Dead centre. We know VW don't use guesswork, therefore we can assume this depth is where it needs to be.
As for why an oval shape, who knows. The TT-S EA113 engine uses a 3" round MAF mounted far away from the turbo, so this is something I may look into in the future.
I suspect it's because on the GTI, the MAF sits so darn close to the turbo and they found an oval gives a more consistent reading. Anyway, it's all good, I like experimenting with this stuff!
