All Things Mk5 > Performance Modifications

Aftermarket Intakes and Fuel Trims.......

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ROH ECHT:
I found this on Vortex MK6 Golf R Section yesterday. Never saw they did this before but it seems worthy to share. They had people post their fuel trims beginning in 2012, first of two years the MK6 was available here in the US. They had people post their LTFT (MB 032 Group 2) off-idle/partial/multiplicative and the intake they had. Once there were ten cars posted with teach intake they posted a range of trims for each. RamAir, REVO, and some others never made the list. So those could be added if you want to add yours and the list can be updated. Obviously, the MK5 GTI and MK6 Golf R are aging now and the range would likely be skewed more. But would still be interesting to add some that aren't on the list. I am certain those with custom tuning will have better trims than those with shelf tunes. My LTFT is at the high end for a Neuspeed P-Flo = +8% with a GIAC H.O. K04 tune. I have recently done smoke testing and loads of fuel related replacements...and I cannot improve the trims. Thinking about trying another intake made from a type of plastic because a few on the list made of the same have the better trims. The point of the Thread on Vortex was to find out how higher trims were affecting boost and power...and they seemed to conclude they saw higher boost and power once they got an intake with lower LTFTs. I didn't read all of it because there's 80 pages. So here it is....you can add if you like and I will attempt to keep it updated. Not sure if miles driven should be added when LTFT is posted. Mine when I clear codes and drive for 30+ miles is usually nearer +5%...then after a long time it climbs to 8%. Thoughts?

colesey:
I think the revo intake has some decent fuel trims - maybe someone can confirm? Rtech recommend it and their cars typically deliver strong dyno results.

ROH ECHT:
I've seen many posts stating the same on the TFSI Tuning Group page on facebook(Niki's page I believe).
https://www.facebook.com/groups/529405700525327/permalink/2126516754147539/?comment_id=2126655094133705&reply_comment_id=2128514730614408

Likely because of the scaled-down MAF section on the REVO intake.

ROH ECHT:
Anyhow, I hope to get 5 to 10 posts for the RamAir, Autotech, and REVO intakes to add to this. So if you have either, or another popular intake, please post so we could get at least five to ten to show a range of their LTFT (MB 032 Group 2)...that would be helpful.

pudding:

--- Quote from: colesey on December 11, 2020, 06:00:44 am ---I think the revo intake has some decent fuel trims - maybe someone can confirm? Rtech recommend it and their cars typically deliver strong dyno results.

--- End quote ---

Nope, trims were around +8% on my ED30.

I did get my VWR intake down to 5% by sleeving it.

Simple fact of the matter - nothing will ever match the OEM intake for close to zero trims.  The ECU will never accurately fuel the engine if the primary load sensor is misreading.

It's not just about sleeving the MAF pipe down until it gets close to zero, it's also about volume, velocity and laminar flow.  All of this VW spend millions on perfecting. Not one single aftermarket intake comes with a laminar flow grid, not one. Most after market tuners say you only need that to smooth out the turbulence of the factory paper filter, which is absolute nonsense. They simply cannot be arsed, or they lack the skill to incorporate a laminar flow grid into their kits.

It's all a moot point anyway since most people who fit intakes are only interested in chooching noises and (small) gains up top.

For people who value low end response, accurate fuelling and quietness - just stick to the factory air box  :grin:

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