what is my boost from vagcom log

[davidol]

hiya all,

just used google to convert mbar readings to psi from monday nights logging with jonzy but its its coming up with 2360 mbar is 34ish psi...that cant be right

RPM Load Absolute Pres. Absolute Pres.
TIME
STAMP /min % mbar mbar
0.69 2160 49.6 1010 1110
1.59 2200 88 1940 1120
2.49 2360 133.8 2020 1700
3.39 2560 182 2120 2360
4.29 2760 167.7 2190 2160
5.19 3000 173.7 2290 2250
6.09 3240 177.4 2330 2270
6.98 3480 178.9 2320 2280
7.88 3680 176.7 2310 2260
8.79 3880 178.9 2320 2250
9.68 4080 178.9 2310 2250
10.59 4320 175.9 2260 2200
11.69 4520 171.4 2210 2130
12.59 4680 167.7 2150 2070
13.49 4840 163.9 2090 2000
14.39 4960 160.2 2040 1950
15.29 5080 157.1 2010 1910
16.19 5200 153.4 1990 1880
17.09 5240 150.4 1970 1880
17.99 5360 148.1 1950 1860
18.89 5440 144.4 1930 1830
19.79 5520 142.1 1910 1820
20.69 5600 139.8 1890 1780
21.59 5680 137.6 1840 1760
22.49 5800 135.3 1820 1740
23.39 5840 134.6 1780 1710
24.29 5840 12.8 1010 1480
25.19 5760 7.5 1010 1100
26.09 5600 9 1010 1080
27.18 5400 9 1010 1070
28.08 5280 9 1010 1070
28.98 5080 9 1010 1070
29.88 4960 9 1010 1070
30.78 4800 9 1010 1070

what psi is my car pulling and is the first column actual or requested?

David

 

[Jonzy]

Sorry forgot to say, knock 1000 off the vagcom figure then use google

 

[davidol]

that the definative answer or are you guessing? lol

 

[Jonzy]

Its correct, mine spiked @ 2510 ... 1510 is 21.9psi which is what I expected.

 

[PhilW]

Spikes at nearly 19psi.... hmmm

 

[JKing]

(Boost-1013.25)/1000x14.50377

some for instance: (2300-1013.25)/1000x14.5077 = 18.66 psi

2510mbar = 21.71 psi

 

[JKing]

plotted your data into a graph mate:

 

[bentaw]

always take 1000 away as that is normal atmospheric pressure roughly anyway

 

[davidol]

so im down on boost ever so slightly, any suggestions?

 

[Jonzy]

be pleased, mine looks like steve wonder been giving art lessons!

 

[davidol]

@ matt

still want to know why i could be down a few psi, any suggestions anyone?

 

[CupraSteve]

its not really, mine peaks about 19psi, dont forget jonzy has revo stg2 and sps3 to up his boost, i have an sps3 but dont wanna go any further with the boost really

 

[davidol]

my boost is higher than jonzy's though im sure, my car is set at boost 8, timing 6 or 7 (cant remember) which is pretty much as far as it'll go? i thought that adjusts how the car delivers its boost, not the actual amount of boost

 

[CupraSteve]

yes it only adjusts the peak boost very slightly, just delivers it longer.

Do u have standard hoses?

 

[acidstrato]

perhaps thats the problem dave

my boost is set to lower than 8 i think and i see peaks of 20/21psi

 

[davidol]

hmmmm steve ive got std hoses apart from my forge FMIC which was fitted by myself, im confident i havent got a leak there so maybe acidstrato is right, i might need to turn the boost down to see larger spikes but on the flipside of that shes running fantastically at the moment (touchwood) so i think i'll leave her alone!

 

[CupraSteve]

yeah mine doesnt peak so high either and mine feels like a rocket atm, with a dodgy N75

 

[acidstrato]

aslong as its quick..who cares hehe

 

[davidol]

acidstrato (sorry your name aludes me at the moment ) where we you monday night!!!!

 

[acidstrato]

my names Carl mate

too short notice was my excuse, next time