maf logs. whats the verdict?

[gulzar]

hey all, went out and did a few runs in the lcr jabba map, logging mass flow rates as i have modified the cold air feed to my bmc-cda and cut some plastic away in the maf resulting in these results. ive edited out out any idle measurements so you see whats happening under load.

checked the car for fault and thankfully nothing showing up. car is pulling like a train thankfully, touch wood.

all feedback appreciated. let me know what you think??

thanks

gulzar.

maf flow is highlighted in red.

Group A: '002
RPM Load Inj. On Time Mass Flow
TIME
STAMP /min 0% ms g/s
0.87 1880 20.3 2.04 7.64
2.17 1960 73.7 7.82 29.14
3.38 2520 109.8 11.56 60.28
4.7 3680 191.7 18.02 167.78
5.99 4880 183.5 15.3 195
17.37 4000 191.7 19.04 174.17
18.57 5600 191.7 16.32 210.97

46.63 2080 75.2 6.8 31.67
47.95 2760 81.2 6.8 39.75
49.24 3280 65.4 5.44 40.25
50.5 3760 100 9.52 82.25
51.77 5600 189.5 15.64 211.61

144.9 2720 82 8.16 48.28
146.3 3200 148.9 14.62 102.03
147.62 4120 191.7 19.38 178.53
148.82 4920 191.7 18.36 200.81
150.13 5680 191.7 17.34 217.72


348.28 4760 191.7 17.68 202.69
349.69 5280 191.7 17.68 208.44
350.89 5640 191.7 17 221.22
352.11 5960 191.7 17 223
353.32 6240 182.7 21.08 219.83
354.71 6520 170.7 19.38 220.86

 

[m.r.davies]

I put a brand new maf on yesterday and it peaked at 200
so I would say yours look good

I'm running a stock air box on mine

I'm just comparing the peak figures though, someone else may comment on the figures at different RPMs

 

[wild willy]

Excellent power being made there. 223g/sec x 1.31 = 292bhp

How about a log of chanel 118 for us to see.

 

[gulzar]

Excellent power being made there. 223g/sec x 1.31 = 292bhp

How about a log of chanel 118 for us to see.

it definately feels quick when heat soak is not happening. will try post up logs of block 118 wild willy. need a front mount asap, altho winter coming soon so hopefully wont suffer so much. is that the rough calculation? i thought it was multiply by a factor of 1.25 altho not too sure.



gulzar

 

[gulzar]

I put a brand new maf on yesterday and it peaked at 200
so I would say yours look good

I'm running a stock air box on mine

I'm just comparing the peak figures though, someone else may comment on the figures at different RPMs

200 on stock air box is impressive m.r.davies. i'd recommend doing the bigger cold air feed mod as it helped me in the past. ive managed to get the cold air feed right down to the front passenger fog light side. allows a forced induction effect.

cheers, gulzar.

 

[m.r.davies]

That's good to hear!,
I was think about doing a cold air feed, did you have to remove the fog light?

 

[wild willy]

it definately feels quick when heat soak is not happening. will try post up logs of block 118 wild willy. need a front mount asap, altho winter coming soon so hopefully wont suffer so much. is that the rough calculation? i thought it was multiply by a factor of 1.25 altho not too sure.



gulzar

Different cars have different factors. some use air mass / 0.8 (x 1.25). A stock 210 LCR makes approx 160g/sec = 1.31.
1.31 has worked out spot on for me on awesome gti's dyno.
Only way to know for sure is to get it RR at a few places and average the results then compare to your g/sec tell us your multiplication factor.

 

[Willie]

i have modified the cold air feed to my bmc-cda and cut some plastic away in the maf resulting in these results.

You got any details on how you did this?

 

[gulzar]

mr davies- yeah had to get rid of the fog lamp, now got a big old pipe entrance bout 3-4inches that runs straight up to the bmc-cda. gets a proper direct ram air effect .

wild willy- thanks for that info and your right, im going to have to do a few rr's to find out for sure but i must say if 1.31 is correct then im welly happy with the potential bhp figure.ive got some requested boost with actual boost logs, will post them up for you to see. not had chance to do block 118 yet.

 

[gulzar]

You got any details on how you did this?

hi willie,

i bought some duct tape, and flexible duct pipe from b & q .
the duct pipe was then wrapped in duct tape for strength. the standard feed that comes with the bmc is only long enough to make it to the back of the headlight. so anyway, i got rid of the plastic border peice behind the headlight that hides the passenger side intercooler. required alot of effort and a bit of cutting i have to add.once this was removed along with the oem air filter duct i could clearly see down to the fog lamp area. now all that was left to do was feed the flexible hose to the front of the car and attach the other end to the bmc-cda.

now here comes the maf part. i took the maf sensor out and on observing it i could see that on the air filter side there are 2 grid type things where the air flows into the sensor. i knew that the grids are there to create a smoother flow to pass over the maf element, but i could see that there were 2. one was plastic and the other a metal mesh with a very fine grid. the internal of the bmc-cda has 3 fins which are designed to speed flow in a spiral, but i knew that when it was hitting the first maf grid which is plastic and very thick so the spiral effect of the air must have been slowing down. anyway, i then removed the big grid from the maf leaving the metal one so that the element still gets laminar flow through a fine grid mesh. i connected it all up and secured the fog light end of the ducting so it gets a blast of air thru the fog lamp hole.


finally did some logs of boost and maf flow. was shocked at the results as was expecting bout 205g/s but i ended up with more.results youve seen. i apologise for the explanation of how it was done as to some it might seem confusing without pictures.


hope you get what i mean tho willy. in person its mince to show.


gulzar

 

[Willie]

I follow you perfectly.
Your explanation was spot on.
It would be interesting if you could replace the plastic 'grid' infront of the MAF back in place and do the logs again to see if there is any difference.
I'll be setting up a proper Cold Air feed for my BMC this winter, I'll have the whole front end off so will make it easier for me. This sounds like a good route.
I was going to mod a head light to give me a direct feed from the front of the car to give me a RAM effect but will see what looks or feels best at the time

 

[gulzar]

I follow you perfectly.
Your explanation was spot on.
It would be interesting if you could replace the plastic 'grid' infront of the MAF back in place and do the logs again to see if there is any difference.
I'll be setting up a proper Cold Air feed for my BMC this winter, I'll have the whole front end off so will make it easier for me. This sounds like a good route.
I was going to mod a head light to give me a direct feed from the front of the car to give me a RAM effect but will see what looks or feels best at the time

hi willie, thanks, was bit worried the explanation may have seemed a bit confusing or not properly explanatory. and as you asked, i have done logs pre maf mod and found it stopped at about 197g/s. just removing the grid allowed the air to flow fluidly through the maf allowing the difference to show and be felt.. i was shocked at the restriction this was causing. im glad i did it as i have to say once i get moving the car pulls like a train. def recommend doing it.

gulzar.

 

[Willie]

Cheers bud, thought I would just ask to see if there was a difference just with the mesh from the MAF.
I'll give this one a bash, cheers

 

[wild willy]

Its been proven on other forums (using pressure tests) that the biggest restriction throughout the entire intake system is the maff element/housing itself. I run a slightly oversized maff housing without any meshing and it is noticeable the difference.
I've never demeshed the stock maff housing as i read on here before that someone tried it without any gains but as i've learn't from experience you have to try these things yourself. The reason for the mesh is to straighten the airflow through the maff houising although when i run demeshed nothing detrimental is felt or logged. You may get a "maff signal too high fault" measured in vagcom but it causes no harm.
The mesh doesn't want to come out of the stock housing to easy though, i may just chop both ends off and have a log. I do like experimenting.

 

[Willie]

I have a MAF on the way out and am getting a new one soon.
I'll do some logs with old one, new one and new one demeshed.
I doubt it will make any difference on an unmapped car though

 

[wild willy]

I have a MAF on the way out and am getting a new one soon.
I'll do some logs with old one, new one and new one demeshed.
I doubt it will make any difference on an unmapped car though

I'm sure it will make a difference. Can't harm thats for sure.
Cold air feeds and custom intakes will all help a stock lcr.

 

[m.r.davies]

Very intresting this
It would be good to see some figures to see how much difference this makes

would you say a cold air feed is a must with this mod?
If so, can it be done without removing fog lights etc?

 

[Willie]

I'll be FULLY investigating this this winter.
I'll be posting the results

 

[wild willy]

i replaced my maff with a new one last night. previous was 232g/sec new one measured 246g/sec so certaining worth doing if its a few years old. My boost has improved since also.

 

[gulzar]

i replaced my maff with a new one last night. previous was 232g/sec new one measured 246g/sec so certaining worth doing if its a few years old. My boost has improved since also.

willy---thats a huge figure willy, ive only removed the plastic grid and managed to get it up to 225g/s, u think removing the mesh completely will make it even higher?


mr davies---- having a cold air feed would defo help matters i think. its all to do with getting more air in.also personally i feel that removing the fog lamp is prob required although dont qoute me as if you can manage to re route the new feed to somewhere else then by all means.


gulzar.

as a note gents, ive upped the timing with custom settings by 2.25 degrees and getting good CF's across the board, also upped the fuelling under load to help make sure i get enough of a bang.i think the slight fuel increase has helped keep the CF's down also. defo noticing more bang. really need to get onto the rollers.