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APR Presents: Audi TT 2.0 TFSI Valvelift ECU Upgrade!

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Discussion starter · #21 ·
MoreGooderTT said:
To be honest, I was expecting more of a delta improvement. I'm not even tempted to risk having my powertrain warranty voided over this. Just sayin.....
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I think we all were, but the turbo isn't very large and the stock air box is fairly restrictive. If you go with a high flow intake, gains up top will be much more impressive. For example, on the MK6 GTI, we picked up 15-20 WHP with a high flow intake system when coupled with software.

As for low end torque, it's very high right out of the box, but also some of that can be attributed to the dyno. We use a loaded dyno that holds and releases at the beginning of the run. We surely showed more power on the road than stock which was evident by the increase in boost pressure, however on the dyno it did not show a great increase leading me to believe loading on the dyno caused more boost down low for stock, bumping up the stock figures quite a bit and limiting the delta.

I say it's worth getting behind the wheel of a friends car if they have the chip or trying the 30 day money back guarantee. You can try it out and if it's not enough, we'll return you back to stock, no questions asked.

imduder said:
Aaron -- Do you have numbers for 91 octane (that is the highest available where I am)?
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I don't, but expect both stock and chipped numbers to drop. Typically the delta is very similar, but only slightly less.
 
#23 ·
walkwg said:
At one point, I sat in the car with the engine running for nearly 10 minutes waitinf for her to come out of store. Based purely on my limited experience with the car I would have expeced about 26 -27 mpg but was surprised to average 28.3 for the day. Very un-scientific and subjective but it seems like mileage has improved slightly in normal driving. Just my two cents worth and as always, your mileage may vary.
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I too noticed improved gas mileage on my VW GTI after flashing. Dunno if VAG just likes to run them a bit rich out of the factory for some reason....
 
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#24 ·
Gman57 said:
With the ECU upgrade is the performance similar to a stock TTS. Also is there as much lag from a start as with the TTS. Thanks
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there's a noticeable increase in lag coming from a TT with the EA88 with valve lift to a TTS with the older generation engine. In stock form, torque peaks at 2500 in the TTS, the new TT valve lift peaks at 1650
 
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#25 ·
I actually think there is less lag after the tune than before. It seems like acceleration from a stop is more linear than stock. I've never driven a TTS so I can't compare them. The lag seems about the same as my old MKIV GTI.
 
Discussion starter · #26 ·
Gman57 said:
With the ECU upgrade is the performance similar to a stock TTS. Also is there as much lag from a start as with the TTS. Thanks
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It will not have the same top power as the TTS but torque will be similar. Spool of the the turbocharger will be instant with no lag like the TTS.

YYC Dubber said:
I too noticed improved gas mileage on my VW GTI after flashing. Dunno if VAG just likes to run them a bit rich out of the factory for some reason....
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Typically they run at lambda 1, until it gets too hot and then jumps to a rich component protection mode. This car was a little different but it was very rich all the time, regardless of what EGT's were. We've restored a sane air fuel ratio for cruising while ensuring it doesn't get too hot and jump into component protection so quickly.
 
#27 ·
Perhaps the Audi engineers wanted the engine to run on the rich side to prevent detonation. If not, why wouldn't they run it close to 1.0 lambda and acheive a better MPG? (I got my ECU education from Google just now. Isn't the internet amazing?)

Another thought: Perhaps the fact that they run this engine "rich" contributes to the valve deposit problem.

I hope there's a logical reason to run the engine rich, otherwise Audi has done a rather poor job on the combustion management.
 
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Discussion starter · #29 ·
MoreGooderTT said:
Perhaps the Audi engineers wanted the engine to run on the rich side to prevent detonation. If not, why wouldn't they run it close to 1.0 lambda and acheive a better MPG? (I got my ECU education from Google just now. Isn't the internet amazing?)

Another thought: Perhaps the fact that they run this engine "rich" contributes to the valve deposit problem.

I hope there's a logical reason to run the engine rich, otherwise Audi has done a rather poor job on the combustion management.
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Most of the stuff you read on the internet is for older unintelligent ECU's. Bosch is very complex. Running at a higher lambda and then switching to a lower lambda is the way it's designed to operate. When it's running at a higher lambda, ignition advance is also adjusted to prevent knock.
 
#31 ·
Arin@APR said:
Most of the stuff you read on the internet is for older unintelligent ECU's. Bosch is very complex. Running at a higher lambda and then switching to a lower lambda is the way it's designed to operate. When it's running at a higher lambda, ignition advance is also adjusted to prevent knock.
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Interesting. Thanks for clarifying. I know that the complexity of the ECU is what makes company's like APR all the more impressive.
 
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Discussion starter · #38 ·
imduder said:
I sent you a PM with the info (actually two -- I'm new to all this and not sure the first one went through). Let me know if you did not get it.
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Got it! I'll get you an answer on monday.

GERMANCARMAN said:
I have one more question, how long will it take the dealer to do the flash????

Will I have to leave my car or is this something that takes an hour or less?

Thank you
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It should only take around an hour.
 
#40 ·
i think the gains are minimal because Audi sandbagged what the posted numbers were. so audi did the gains for us but didn't tell us they were there. so now we have software with minimal gains, because what APR could have tweaked out of the engine, was already done by Audi from the start.

it's great the car makes more power stock than we thought, but it sucks the aftermarket gains are less than we hoped for.
the area under the curve is great thought, i just don't know if it's worth it FOR ME now, especially on a leased vehicle.

and i was the one with the biggest mouth wanting for this to come out.
 
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