vagcom to determine bhp

[mark garfoot]

hi could anyone talk me through how i can measure my bhp using vagcom many thanks

 

[Damoegan]

You cant...

 

[mark garfoot]

i thought you could do it through maf readings, never mind rolling road it is thanks anyway

 

[truCido]

as a rule of thumb...take the MAF reading and times it by 1.3

 

[mark garfoot]

what measuring block do i use for the maf reading thanks

 

[truCido]

002

 

[mark garfoot]

many thanks truCido will try that first thing
i measured my blocks for boost today i think ive done it correctly i worked it out to just under 1.4bar of boost could you tell me if i have done it right huge thanks if you can, heres a section of my results i got

364.58 3520 185 2260 2320
364.98 3600 181.2 2300 2300
365.49 3720 175.2 2310 2270
365.89 3800 172.2 2250 2250
366.29 3800 163.9 1290 2400

 

[truCido]

You need to do a run in 4th from low ish revs right up to the red line without lifting to get some decent readings. But as you say that top reading is 1.4bar which is about 21 psi....strange that the car was only requesting a lot less than that though and it was actually giving 1.4bar

 

[mark garfoot]

i have been having problems with my maf if that could cause it, i only refitted it before i did the run this morning after giving it a good clean will try a run in 4th tomoz many thanks

 

[mark garfoot]

did my maf run today heres some of the results

9.25 5360 153.4 23.46 155.25
9.66 5520 151.1 23.8 159.92
10.06 5640 149.6 23.8 159.47
10.46 5800 146.6 23.46 161.83
10.86 5920 145.9 23.46 164.19
11.28 6080 143.6 23.12 163.64
11.66 6160 142.1 23.12 167.11
12.17 6400 141.4 22.78 167.64

 

[Tfsi_Mike]

MAF / 0.8 isnt it?

 

[mark garfoot]

do you mean the block? lol if you did i used 002

 

[truCido]

Well your max MAF reading there is 167.64 so times that by 1.3 and you come out with pretty much 218bhp

 

[Tfsi_Mike]

dont know why ive got / 0.8 in my head (maybe its an AFR calc) but Max MAF reading there / 0.8 is 209.5

 

[Damoegan]

AFR=vag-com reading / 14.7, Mike..

The whole BHP calc from MAF reading can be so far out its not something I would rely on. It can also vary, some say MAF * 1.3, some say MAF * 1.2 and some say MAF * 1.25.....

You have to also take into account how boost, timing, intake temp etc etc effect how power is made, not just MAF readings...

 

[Tfsi_Mike]

Cheers for clearing that up Damien

There are quite a few variables and would only use as a guide to be honest

 

[mark garfoot]

thanks for the info guys will see about a rolling road to determine the actual bhp

 

[Damoegan]

A rolling road will still only be a guide but is your best option

Mike, you had yours on the rollers yet?

 

[Tfsi_Mike]

Last time it was on the rollers was 330. Since done De Cat, Heat reflective wrapped inlet and fitted RS4 fuel return valve.

APR has always given tame / safe / conservative figures, going REVO when I move back to England

 

[Damoegan]

Did you net gat a chance to switch to Revo when Awesome changed over?