high oil usage, any ideas?

[heavyd]

Yep, something is really strange. its the 9th stage 3 map I've had now
There was a new shape leon cupra on the rollers before mine at that dyno, and it made 5bhp over stock power with no mods. When I had it on PDTs roller before in stock mode it made 245bhp
Its really driving up teh wall this car now, I would sell it, if I hadnt got evrything else the way I want in, it has all the optional extras fitted etc etc I would only go and buy another Ed30 anyway if I sell it.
I'm going to wait and see what Ben says first Dave. I've spent a small fortune on Dyno runs now
I think he said he took 12degress of timing out of the map its running now compared to the 348bhp map, but dont know what that relates to
Yep, shame that Revo werent willing to sort the map out when I had it on before. I could always sell the HPFP and get Revo stage 2 while its £100 off
I'

[Tfsi_Mike]

More remaps than I've had hot dinners! Lol

[Janner_Sy]

You should have left it as it was before the dsg remap i think. Good figures, no timing pull, no issues etc.

[shark_90]

Did they take a boost reading? Something's very wrong there whether it's a leak or similar. Shame it all worked fine before/immediately after the dsg map. I really don't think it's a software issue with the results that car gave previously.

[PDT]

12degress of timing out of the map its running now compared to the 348bhp map, but dont know what that relates to

12 degrees of timing is massive, at full load a stg2+ sees 25ish degrees of advance. If an engine is running MBT (minimum best timing, i.e the perfect amount of timing) then taking 1 degree out can cause a drop of 8hp easily. 12 degrees can drop 30-50hp easily but it will be massively retarded and cause high combustion temps.

Log the actual spark advance under load, see how many degrees its advancing under full load. You will be looking for 23-26 degrees.  

[heavyd]

You should have left it as it was before the dsg remap i think. Good figures, no timing pull, no issues etc.

Hindsight is a fine thing
It was all ok before I had the Revo DSG done, thats where all the extra revisions came from the aftermath

Did they take a boost reading? Something's very wrong there whether it's a leak or similar. Shame it all worked fine before/immediately after the dsg map. I really don't think it's a software issue with the results that car gave previously.

I havent got a boost gauge Ben, so theres no T for the boost unfortunately
The logs show that the car seems to be making boost ok? Shame I didnt get it on the rollers when I was down at HQ

Log the actual spark advance under load, see how many degrees its advancing under full load. You will be looking for 23-26 degrees.  
[/quote]
Which block would I need to be looking at for that Dave?

[bacillus]

Block 003 for ignition timing.   

[heavyd]

Heres a timing log then

[chungster]

I don't know how accurate the MAF to BHP conversion factor of 0.8 is, but if it's applied to your peak reading of say 249, then you're only at 311bhp!

[martziniuk]

It is getting very lean at high rpm and the ECU is pulling back, look at the throttle angle.

[PDT]

Logs all match up with the power figures you saw today, ECU is pulling back as martziniuk said. Something odd is going on with the timing, should see a steady figure of 20+ degrees under load but all of the logs I have show Timing BTDC but yours shows ATDC (before top dead centre and after top dead centre) so not sure if these numbers are correct or not.

As a test can you flash the stg2 that you have and log all of the blocks as you have done above and the intake air temp block. I know that stg2 map inside out and know exactly what the log should show.

[heavyd]

Thanks Dave, will flash that file tomorrow and go for a brisk run after work
I checked some old logs and they showed BTDC aswell?

[Janner_Sy]

So if one set of logs show btdc and another atdc how do you compare timing, or isnt it possible to comparable

[PDT]

ATDC means that its logging the retardation of the spark (i think, not really used ATDC in vagcom as its a bit pointless)

heres a copy of what sort of figures you should see in the ign log:

 

[PDT]

So if one set of logs show btdc and another atdc how do you compare timing, or isnt it possible to comparable

spark timing should always be BDTC at the point of optimum cylinder pressure i.e the piston has compressed the air and fuel mixture in the combustion chamber and both intake and exhaust valves are closed. The piston is at its highest point in its stroke at TDC (top dead centre).

Fuel takes time to burn so you need to ignite it at a point before TDC so that when the piston is at TDC the combustion is at maximum pressure (the explosion is at its most potent) so that it pushes the piston down with as much force as possible. The point of ignition must be before the piston reaches TDC so its known and measured in degrees before TDC (using crankshaft degrees as a reference)

Heres where the fun starts, if you over advance the ign timing then the peak pressure happens before the piston gets to TDC so as the crank is forcing the piston up the cylinder, the pressure is trying to push it down. This causes 'knock' as the piston rocks around in the cylinder on the axis of the gudgeon pin (pin that holds the piston to the conrod) as it cant control its direction of movement.

If you under advance (retard) the ign timing the maximum point of pressure happens after the point of TDC and the piston is already on its way back down the cylinder so the pressure dissipates and the piston doesnt get the same amount of 'push' back down the bore = less power.

So you are trying to find the precise point that the engine makes most power by advancing and retarding the timing known as MBT i,e the point at which the engine makes the most power with the minimum amount of ign advance. If the ignition is happening before the point of TDC its measured as BTDC and if its too far retarded its happening after TDC so ATDC. The two are directly related but just measured at a different point of the crankshafts stroke.