All Things Mk5 > Performance Modifications
Aftermarket Intakes and Fuel Trims.......
ROH ECHT:
--- Quote from: Pudding on December 24, 2020, 04:46:24 pm ---OK, makes sense. North America always misses out on the decent spec Euro cars. Right...LOL...it took until mid-2006 to get the MK5 here. VW had to make reductions to it for the lower VWofA price point.
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? I'm not certain what tune it has. He messaged me from the "TFSI Tuning" fb page...and my fb messages have been deleted.
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. The irony of those claims...LOL.
It would therefore be interesting to see what MAF reading he gets with the standard intake. Yes, I mentioned he do this if he still has the stock air box just to see the air volume with it...and to consider the REVO intake has its design flaws.
Ambient temperature and elevation can also affect MAF readings. Funny...his last message said he is back up the mountain and the trims rose to +11%
Yeah you don't see big reductions in pipe diameter right next to the MAF on OEM intakes! GIAC are on the ball.
--- End quote ---
Recently I thought of asking on a local fb page if anyone has the complete "air inlet to turbo", and engine cover, bits from a MK6 Golf R they may be willing to sell me. Wouldn't mind testing this all myself.
pudding:
MK6 R intake parts are exactly the same as K03 GTI, except the panel filter. For some bizarre reason, K04 engines have a slightly thinner filter than K03. Different part number.
In the UK, many tuners have found the standard intake components (inc paper filter) is good for 330 crank hp. Curiously enough, this is exactly the maximum hp Borg Warner themselves quote for the K04.
Higher numbers have been seen with aftermarket intakes for sure, 350 is about all you get, completely strung out. The 380-400hp figures seen on the internet can be ignored as the turbo simply cannot flow enough for that amount of horses.
The airbox to try is the MK2 TT-S with the CDL engine. It has a massive volume compared to the GTI, and a bigger MAF. The battery will need relocating though.
ROH ECHT:
--- Quote from: Pudding on December 31, 2020, 10:40:29 pm ---MK6 R intake parts are exactly the same as K03 GTI, except the panel filter.
--- End quote ---
Not the same here due to the DV location. The tube differs between the air-box and turbo inlet. K03 DV is mounted on the K03...and the K04 DV of the MK6 Golf R is mounted forward near the throttle inlet pipe. I no longer have any of it so I would need it all but with the K04 tube between air-box and turbo.
pyle:
Can't one just build an intake around the stock MAF so as to keep the fuel trim as close to 0? What would be an acceptable trim change since on my old car had a range of +10 to -10 which VAGCOM pointed as acceptable. What are the actual restrictions in the stock airbox/tubes?
pudding:
We used to be able to, using this part - https://www.ecstuning.com/b-42-draft-designs-parts/fsi-maf-housing/1315297~42d/
But sadly it looks like it's no longer available.
The critical thing even that MAF housing doesn't have is the laminar air flow grid. It's critical the air pulled through the MAF is straightened, otherwise you get massive trim errors.
It's something that could easily be 3D printed though, and incorporate a steel mesh. It's time and resources though.
The air coming into the engine, and the burnt gases being shat out of the exhaust are all finely optimised at the factory - end to end. Changing any of the components has an adverse affect on the engine response, be it at the low end or the top end. That's why most people always go back to the factory intake because they either can't stand the noise of an aftermarket system, or the altered throttle response.
If it was easy to build the perfect compromise at an affordable price, it would have been done already :wink:
+/- 10% is a very wild deviation. A healthy running engine should be around 1% on the trims.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version