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I seem to be losing power over time, resetting the tune (going to standard and then back to the 98 tune) seems to fix the problem. Am I imagining the loss of power or is it really happening?? No missing/ CEL / anything.
[QUOTE=Blue9N3;1125505]I seem to be losing power over time, resetting the tune (going to standard and then back to the 98 tune) seems to fix the problem. Am I imagining the loss of power or is it really happening?? No missing/ CEL / anything.
Checked the receipts and I have v2
Sent from my iPhone using Tapatalk[/QUO
Have it scanned for faults and check the fuel trims.
I seem to be losing power over time, resetting the tune (going to standard and then back to the 98 tune) seems to fix the problem. Am I imagining the loss of power or is it really happening?? No missing/ CEL / anything.
Ben (noone) had the same impression
Resident grumpy old fart VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS
As did Bfeboi (years ago). At the 1 dyno day we went to, he pulled a lot more torque than I did. He reset his before the dyno, I hadn't.
The solution; Custom Code. It sucks to pay for something twice, but its cheap for what you get and is a noticeable upgrade from APR with the mods I had.
FYI, V2 is not stage 2, from memory there was a second version of the stage 1, their other option was to bypass the 02 sensor for an upgraded exhaust, but not a re-tune to suit.
APR make good tunes, but the tune for the Polo was conservative (IMO) for how strong the 1.8T and K03 can be. with a dump pipe, upgraded intake section and FMIC, CC is your best bet.
Also, Gav is very good to deal with, so support is just easy.
No codes, fuel trim at -2.3% (same since reset), timing goes to +35 and the drops back to ~5 at full boost?
Noone, you're probably right but I am curious to see what is causing the loss of power, is it an apr thing or Is something wrong with my car? Ie misfire, bad fuel pump .. Or am I just imagining it all!
You should take a set of logs before and after a reset. You'll have something to compare then. Timing is always retarded during boost so the numbers don't mean much in isolation.
No codes, fuel trim at -2.3% (same since reset), timing goes to +35 and the drops back to ~5 at full boost?
Noone, you're probably right but I am curious to see what is causing the loss of power, is it an apr thing or Is something wrong with my car? Ie misfire, bad fuel pump .. Or am I just imagining it all!
Hoping that GuyH could shed some light here.
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Nothing sounds amiss & as mentioned by several other you need good data logs. Ambient & intake temperatures are two factors which always have to be taken into consideration when looking at the data. You can also look at your air mass - but the fuel trims will be a give away (as mentioned) of something out of whack.
Depending on your service history, when we are doing a 10 year old Polo (or any other 10 year old car), we recommend the following items be checked & replaced as a maintenance thing to ensure your software will work as intended.
Compression test
Boost hose condition test (look for oil softening) including all vacuum lines.
Air Mass Meter
Coolant Temperature sensor
Plugs (with correct gaps)
So often these days we find these items have deteriorated to a point where the car is far from optimal - tuned or not!
Thanks Guy. So in other words, the apr tune doesn't normally "lose'power" unless something is amiss. Will do a bit of googling to work out how to check the afm and coolant temp
Sensor
Is your diverter valve all good? Not running the factory one still are you? The N75 died quite recently on my silver polo, though it's a huge difference in power, from having some to none, initially it was intermittent.
Gav/Guy, would it also be worth to log the requested and actual boost values??
Track Car: 06 Polo GTI Red Devil mkII Daily: 2010 VW Jetta Highline Gone but not forgotten: 08 Polo GTI
** All information I provide is probably incorrect until validated by someone else **
Gav, might need to use something better than dashcommand for the logging ....
Sean, consistently Getting 1.2 bar so the n75 must be ok, but not always the power. Hard to explain, seems flat sometimes. Seems to point to either timing or leaking dv perhaps? Have a forge diverter lying around which I'll give a go.
Do you have an intercooler? My guess is heat soak. I don't know anything about dash command, I only use VCDS. There'll be someone nearby with a lead.
If the intake temps go out, it'll pull timing and go "flat". Most turbo cars are like it if you get stuck in traffic and then out into the open road. First couple of KM gets the heat out of the IC.
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