It is gonna work like the original one or need some changes in the programing side?
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to understand ,you not gonna use same plug from oem maf right?A bit of a hasle, but if it is the solution.....Comment
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Well I've seen JP car running 525hp on original maf and wondering how it is working?!If JP can explain us better what maf mods he donne is a less expensive way I think!Comment
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Less expensive?
The HFM5 MAF alone is 140 euros cheaper than the original MAF (and the original MAF price keeps going up - 60 EUR rise in 1 year now). Plus the original MAF needs a custom housing.
Then both options need a remap. Both need plumbing. Moving stock MAF to pressure side needs more work than fitting a HFM5 before turbo.
The connectors for the HFM5 are a couple euros each.
Less expensive? I don't think so. More like the HFM5 solution is parts and labor wise 2-3 times cheaper.
What's the big deal in changing the connector anyhow? A soldering iron, some heat-shrink wrap and you're done.Comment
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I am pretty sure they both used a larger housing as well.
With the stock housing, you can read to about 350hp, after that it's mapping to the last cell, which is not good for the engine.
The reason for using older MAF, trying to enlarge housing, moving it to pressure side etc is because M2.3.2 does not have a linearization table for MAF voltage.
The HFM5 has a completely different curve, so you can not use that without re-writing the logic in ASM inside the ECU that handles how the MAF is read and it's reading converted to load.
It's not enough to edit even all the maps... You can never get it to work by only mapping the ECU without changing the core code.Last edited by prj; 30 January 2011, 12:32.Comment
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I am 99% sure Doug has the standard maf and I am sure Jp will confirm thisChefComment
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Well I've payd for the new maf £90 but the trouble with the new maf is the remap.This it is gonna be expensive .It is easy for you because your are in the bussines but for others it is not as easy.A remap it is £600 and if you already paid another many hundreds for curent setup it is not cheap at all
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Well, then that's just not good, because standard MAF maxes out at about 5.7 volts even with the RS2 turbo.
When you are mapping to the last cell, then as you traverse that cell on spoolup, your fueling goes rich and then it leans up again. Same with timing.
It's possible to make it work - and it does work on full throttle, but you are in essence not using the MAF at all on high load.
That way you can't leave the fuel cut limiter in tact either.
You see, Motronic can work even without a MAF. It has an Alpha-N system as fallback. But that system can never be very precise. Same as mapping after the MAF has maxed out. You can do it, but the ECU is essentially blind after a certain point and uses the same injector latency time and timing for every condition after that point.
It's essentially the same as what happens in a speed density system when maxing out the MAP sensor and then just enriching the last cell / retarding timing in the last cell (or column/row) on the timing map.
I am sure any VEMS user will tell you why that is not good. It will work, but it's just not the way to do it.
600 gbp? For that I can fly to any point in europe, map the car and fly back...Well I've payd for the new maf £90 but the trouble with the new maf is the remap.This it is gonna be expensive .It is easy for you because your are in the bussines but for others it is not as easy.A remap it is £600 and if you already paid another many hundreds for curent setup it is not cheap at all
Why would you pay 600gbp for a remap when you can buy and fit a standalone for that money?
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Anywhere i can get a plug and play kit for that price? By that i mean really plug and play(pray?). would prefer not to spend time changing alot of sensor and doing alot of custom stuff to get them in the right position
95 RS2
97' S6 2.2T 460hp setup
00 GSXR 750
Protected movement - with quattro.Comment
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Well, VEMS PnP is just 120-130 eur more than 600gbp.
You'll have to map it though
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Have gone over all the things i can think of today and all seems fine. even got a another WORKING maf (nr 4...) and still the car is acting like a hooker on crack! So there cant be anything wrong with the maf from what i can se.. When maf plugged in i get a whopping 8,5-9,5 AFR at idle... idling is still in the range of 400-1500 rpms. When reving it seems to kinda missfire and is very rough..
The second i disconnect the maf, reving and idling is just like its a brand new car. AFR in the range of 11,8-12,5
I Think my neighbours almost called the fire station earlier cause all the black smoke
95 RS2
97' S6 2.2T 460hp setup
00 GSXR 750
Protected movement - with quattro.Comment
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The fuel pressure... you said it is 4.5 bar at idle.
Are you sure your car is supposed to run with 5 bar fuel pressure?
AFR should be 14.7 at idle...
Try disconnecting the O2 sensor, maybe it's stuck on lean.Comment
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