View Full Version : vag-com bhp plots etc
Just completed a series of plots on my LC with 4 bar remap. The figures below were gained on a standard "A" road that was neither flat or straight.
Max BHP = 198.7bhp, Block 120
Max Torque = 238 N/M
MAF = 169 G/S, Block 002
Boost = peaked at 18.9 psi, Block 115
Anyone care to comment??? These figures seem quite low (bhp, boost) or is this to be expected doing a DIY job using vag-com....anyone else used this method??? what results did you get..
Aye - revo'd cars seem to have lower torque (on vag-com) but the air you're flowing means all is well
Chris Cupra R
29-03-2005, 00:28
vag com can give u a like on the move rolling road?
sorry im new to all this
yeah - it shows an approximation to calculated torque
Fasterbaby
13-04-2005, 09:52
Which block measure torque? Or is that also in with the BHP one, and is that crank or wheel power that it gives? Thanks
Just completed a series of plots on my LC with 4 bar remap. The figures below were gained on a standard "A" road that was neither flat or straight.
Max BHP = 198.7bhp, Block 120
Max Torque = 238 N/M
MAF = 169 G/S, Block 002
Boost = peaked at 18.9 psi, Block 115
Anyone care to comment??? These figures seem quite low (bhp, boost) or is this to be expected doing a DIY job using vag-com....anyone else used this method??? what results did you get..
Taking into account your MAF reading and using the correct conversion your BHP works out to be 221.39. :thumbup:
ibizacupra
13-04-2005, 12:05
Which block measure torque? Or is that also in with the BHP one, and is that crank or wheel power that it gives? Thanks
Block #120 is ASR Torque... BUT its based on the cars original std tables and only a derived flywheel torque based on loads etc.. Remapped cars alter these maps so they do not correspond so well on vag-com logging. Quite handy to track further mods post chip change however.
:cheers:
Fasterbaby
13-04-2005, 12:39
Thanks Bill, i'll try it.
jonathanp
13-04-2005, 14:55
I didn't think multiplying the MAF reading by 1.31 was entirely accurate??
as most people with chipped cars claiming 280bhp+ have around 200g/s which would work out at around 265bhp
Jonothan
they may claim 280hp, but if they're measuring 200g/s through the maf, then 260-265 is nearer the truth.
Mine was showing 250g/s before it went pop, and I've always said it was 310hp ish. I'm sure it would have shown 330-350hp on many rolling roads. In fact it did.
jonathanp
13-04-2005, 19:34
be interesting to see at JBS how the cars compare, just a thought but in the example above they multiplied the maf reading by 1.31 on the leon cupra wouldn't that figure be different for a LCR as it has a larger maf?
I didn't think multiplying the MAF reading by 1.31 was entirely accurate??
as most people with chipped cars claiming 280bhp+ have around 200g/s which would work out at around 265bhp
The LCR in question did 261 at JBS. vag com gave reading of 200 across maf = 260. If that ain,t accurate i,ll eat me hat.
ibizacupra
15-04-2005, 14:35
Jonothan
they may claim 280hp, but if they're measuring 200g/s through the maf, then 260-265 is nearer the truth.
Mine was showing 250g/s before it went pop, and I've always said it was 310hp ish. I'm sure it would have shown 330-350hp on many rolling roads. In fact it did.
so does that mean mine would read 273g/s then on my 'adjusted' MAF? working back from James's RR figures
ibizacupra
15-04-2005, 14:37
be interesting to see at JBS how the cars compare, just a thought but in the example above they multiplied the maf reading by 1.31 on the leon cupra wouldn't that figure be different for a LCR as it has a larger maf?
Larger so velocity is reduced so scaling is appropriate.. remembering this is an air mass sensor.. g/s is mass per unit time, not a velocity measurement in ecu's eyes
so does that mean mine would read 273g/s then on my 'adjusted' MAF? working back from James's RR figures
yep bill. I base mine on 290g/s on an rs4=380hp.
so 360hp would be 270-275g/s :thumbup:
basstard
15-04-2005, 20:20
Never heard of calculating the bhp of a car by its maf reading,,, could someone please tell me the basic physics behind it all?
But more important than that, is there such a thing for a TDI?
Never heard of calculating the bhp of a car by its maf reading,,, could someone please tell me the basic physics behind it all?
Air Fuel ratio at WOT, X amount of fuel & air produces Xbhp
it's a rough, but reasonably accurate method that more than a couple of people in the know (who work in the industry) have mentioned
It's also within about 5% accuracy on std car vag-com butt dyno too.
Std SEAT ibiza Cupra
http://www.seatcupra.net/m0rk/maf_vs_bhp.jpg
0.83 is a bit overly conservative though. 0.8 is about right to me, but .77 ish seems to tie standard maf readings to standard bhp claims on vag cars.
basstard
16-04-2005, 13:30
thanx m0rk. I guess then that I can't use this on my tdi,,, no std air/fuel ratio,,, :(