All Things Mk5 > Performance Modifications
Aftermarket Intakes and Fuel Trims.......
pudding:
The best you can achieve in terms of accurate trims is to 3D print an OEM MAF housing and attach to that a tapered turbo intake pipe from an EA888 engine. On other end of that, knock yourself out, any old cone will do.
The crucial part is the laminar flow grid to straighten out the vortex created by the compressor wheel, and gradual tapering down of the intake bore.
Or relocate the battery to the trunk and fit the TT-S airbox, pipework and MAF. You will need a remap though as the TT-S uses a different MAF sensor and bigger MAF bore.....but it's a proper OEM way to increase air flow and air volume into the turbo.
ROH ECHT:
Some points you made Pudding are why I am considering this intake.
https://volant.com/collections/2007-volkswagen-gti-2-0l-l4/products/closed-box-air-intake-411520
It is on the the list and its range was listed similar to OEM trims. I plan to call them to find out the diameter of the turbo inlet end...so to mate with my DV relocate. I hope it is 2.75" Dia.. I have this DV relocate.
https://www.awe-tuning.com/fsi-diverter-valve-kits
I agree and do not understand when I see comments made of how great an intake is....because of its new sounds.
pudding:
I've seen that Volant kit before and it looks great. Well thought out and OEM style, although I've read the build quality isn't great for the money? We can't get it in the UK, so our American chums such as your good self will have to confirm on our behalf. If you do buy one, please do share your thoughts :happy2:
I would also be interested to understand how they arrived at their chosen MAF bore diameter. If it was just a basic translation of an ellipse into a circle, it may have the same trim issues as the other intakes. The problem with MAF is it's logarithmic and not linear like a MAP sensor. The airflow readings are all over the place as rpm and load changes, so it's not easy to get accurate trims across the board.
Honestly, I wish their was an affordable aftermarket DI ECU solution to bin off the stupid MAF, but only Syvecs offer a plug-n-play solution......at $4000!!
I just don't understand the fascination of 4 cylinder choochs, pops, bangs and Darth Vaders. Subaru Boxer, V6 and V8 turbo noises, hell yeah, something to get excited about as they have actual charisma and pleasing tones....but a noisy, droney, raspy, chuffing 4 cylinder just sounds lame - imo :grin:
For proper scorched earth VW turbo power, strap a turbo to an R32. Nothing VAG comes even close for noise and power, not even the RS3/TTRS.
Forgive me, but what's the purpose of that DV relocation kit over the OEM K04 solution?
ROH ECHT:
--- Quote from: Pudding on December 16, 2020, 03:34:56 am ---I've seen that Volant kit before and it looks great. Well thought out and OEM style, although I've read the build quality isn't great for the money? We can't get it in the UK, so our American chums such as your good self will have to confirm on our behalf. If you do buy one, please do share your thoughts :happy2: I have been calling them because I want to know if the opening at the turbo inlet end is 2.75". They aren't answering so far, so I plan to phone ECS Tuning to see if someone there can measure it.
I would also be interested to understand how they arrived at their chosen MAF bore diameter. If it was just a basic translation of an ellipse into a circle, it may have the same trim issues as the other intakes. The problem with MAF is it's logarithmic and not linear like a MAP sensor. The airflow readings are all over the place as rpm and load changes, so it's not easy to get accurate trims across the board.
Honestly, I wish their was an affordable aftermarket DI ECU solution to bin off the stupid MAF, but only Syvecs offer a plug-n-play solution......at $4000!! OUCH!
I just don't understand the fascination of 4 cylinder choochs, pops, bangs and Darth Vaders. Subaru Boxer, V6 and V8 turbo noises, hell yeah, something to get excited about as they have actual charisma and pleasing tones....but a noisy, droney, raspy, chuffing 4 cylinder just sounds lame - imo :grin: I agree.
For proper scorched earth VW turbo power, strap a turbo to an R32. Nothing VAG comes even close for noise and power, not even the RS3/TTRS.
Forgive me, but what's the purpose of that DV relocation kit over the OEM K04 solution?
--- End quote ---
Here...U.S., we didn't have an OEM solution as there were no models(VW or Audi) with a K04 or DV located at the front of the engine bay until the 2012 Golf R. So, prior to then we had DV relocation options. Mine was from AWE Tuning. It utilizes the "sound pipe" we have on the MK5 GTI (N. America Region) and places a K04 DV at the intake to turbo coupler. This was one reason why all tuners here required aftermarket intakes for K04 tunes.
I spent nearly an hour talking with GIAC yesterday. Trying to figure out why mass air differs. Because I was asked by a stage 2+ ED30 guy why my mass air data is 272 g/s(4th gear) to 280 g/s(3rd gear) when his is 240 g/s. Andrew (GIAC) says many things have to do with why the MAF sensor data changes. They were involved with development of an intake for our MK5 and the first version would cause a cut-out under high load and due to disturbed air flow. When testing it...they went to and up a hill....it would just nearly die part way up the hill under heavy load. Anyhow, he says air must be traveling very undisturbed at the MAF...which I already know. So I then asked Andrew to look at the REVO intake. The same intake of the person who asked me what my mass air was. He pulled it up online and immediately said he doesn't like the reduction just upstream of the MAF. So I said look at the RAMAIR next...he said it has the same issue. He added, he isn't sure how those reduction sections just before the MAF will affect air flow, but it will. He said he wouldn't be surprised if the LTFT's for those intakes would be farther from zero than the oem airbox. Also, intakes with multiple connections can have high LTFT additive. He didn't have time to look at the Volant, but given the results of 0% to 5%...I'd say it works well. But quality?....I don't know.
It would be nice to see some LTFT posted for both the RAMAIR and REVO intakes.
pudding:
OK, makes sense. North America always misses out on the decent spec Euro cars. And what Euro cars you do get, are strangled by California emissions controls! You guys have some seriously anal and frankly silly vehicle regulations and laws :grin:
What I don't get is why after all the silly rules and massively strict emissions and safety regs you have, red turn signals are allowed :grin: They are seriously dangerous. Should be amber like the rest of the world :smiley:
Interesting. 240gs equates to roughly 300hp, and you're seeing 350hp. 300hp is a mild boost 'stage 1' over here on the K04. Stage 2+ usually sees similar to your numbers. What map did this ED30 guy have?
The Revo intake is crap. I bought one and after an hour's drive I saw +8% trim :surprised: I removed it and sold it as that's unacceptable.
So let's say the Revo under read 8-10% on this gentleman's ED30, his MAF reading could actually have been 253gs. Remember what intake kits claim - MORE airflow, not less :doh: Classic example of how a poorly designed intake can cost you power, rather than adding it. If the ECU is only seeing 230gs, it's certainly not going to add fuel for 253gs, so you simply won't get 253gs worth of hp, which is approx 316hp.
It would therefore be interesting to see what MAF reading he gets with the standard intake.
Ambient temperature and elevation can also affect MAF readings.
Yeah you don't see big reductions in pipe diameter right next to the MAF on OEM intakes! GIAC are on the ball.
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