VAG-COM Logging

**mikepologti** · 24-03-2010, 02:33 AM

didnt log before the install by chance? just curious. i know how you feel noone i feel my boost curve has even out alot since my intake and exhaust mods were done. i done feel that sudden surge and wheel spin as much and i get quite a bit more top end( placebo? still not sure). thats why im going to the dyno day on the 10th of april so i can answer my queries.

**RoSonic** · 24-03-2010, 02:45 AM

I didnt log the temperature before...

but it was a lot hotter - I wasnt able to keep my hand on the intake because it was to hot - and now I can do that.

**noone** · 24-03-2010, 08:47 AM

Originally Posted by RoSonic

Here's some logging I've made a few days ago after installing Forge fmic:

Intake temperature and boost on measuring block 118

Thanks mate. What mods have you done? If you remove the ambient 1000m-bar of atmosphere, looks like you are making 700m-bar of boost?

I don't really get wheelspin, but it has been very different since my suspension work in December.

**RoSonic** · 25-03-2010, 01:49 AM

The only engine mods are the pd160 intake and forge fmic, nothing else.

Think I'll do some logging tonight on block 115 to make a graph of boost values. Will post it here.

**RoSonic** · 25-03-2010, 07:40 AM

This are the logs on 115 block:

both runs are made in 3rd gear.

Any comments about how the graph looks are welcomed

**noone** · 25-03-2010, 09:12 AM

Thanks mate, looks fine to my untrained eyes.

Your boost is currently about 600 m-bar (after removing the standard 1000 m-bar of normal atmospheric pressure, which is about right for stock. With a good chip, the boost rises to 1500-1700 mbar which from my reading is about all the K03s is good for. More pressure creates more heat and is less efficient.

The boost starts to taper off after about 4000-5000 rpm which is pretty normal for the stock turbo.

The mods you have done don't make a huge difference with the stock ECU, do you plan to chip it any time soon?

**RoSonic** · 25-03-2010, 05:37 PM

Yes, the chip tuning will come soon (very soon I hope

).

Here's another graph - rolling start from 1st to 4th gear at full throttle
( rpm on right y-axis, mbar on left y-axis, time in seconds on x-axis )

**noone** · 25-03-2010, 05:44 PM

Interesting.

TBH, I think the best torque is from about 3000 rpm to 4500 rpm, you can see your boost is dropping of soon after each shift.

It will be a different beast after a chip... 6000rpm in 4th, must have been flying...

**RoSonic** · 25-03-2010, 06:11 PM

Right, that's what I'm thinking also - for best acceleration I should shift earlier, as the torque starts to drop after 5000rpm :

There's an example somewhere (on ross-tech website I think) - that makes a "shift point analysis" - by comparing acceleration values in each gear. Will try that to see what it shows.