Originally Posted by
lokeh
So APR guys are telling me that I should not run that long on upgraded fuel pump and the normal 93 program. I installed the fuel pump today and was planning to get the new APR program tomorrow.
I should keep my RPMs under 3500 and not boost too much. Sucks, but easy enough.
I have read a couple threads on these boards about ppl getting new fuel pump and saying how much they loved it but still without getting the ecu upgrade from APR.... Then of course they like it even more.
Based on those threads though, one would assume they were boosting high and not worrying about RPM levels.
Right now there is this new ECU update from the dealership, which I was planned to get done tomorrow early in the morning, then go to the APR vendor and get upgraded to fuel pump software. To limit my time on the newer fuel pump without the correct software.
Now this APR guy has me worried even more about future upgrades and such.
Is this stock mode and 100 octane program also programmed for the new fuel pump to not cause me a problem when I switch to those?
Curious to hear some thoughts.
Lokeh:
Running Upgraded Pump without Pump Software
There is no huge danger with running the upgraded pump with your existing, non-pump software for a short period of time. However, the control strategy for the fuel pump MUST be upgraded due to the larger flow capabilities of our pump compared to the OEM design. The reason is that the original control strategy for the pump pressurization solenoid is designed around the fuel displacement of the original pump. Since our pump flows up to 40% more fuel, the original solenoid control strategy is no longer valid. This could lead to drivability issues, fuel adaptation issues, etc. If anyone on Audizine knows anything about control systems, they know that the control loop tuning must be right to ensure there is no odd system behavior. Not having the proper pump control software would be like have an improperly tuned N75 valve and expecting your boost pressure to always be on target...it doesn't work.
We recommend that all of our customers get the software installed as soon as the pump goes on the car. However, you should be okay to get the pump installed and drive the car to the APR dealer the next day. However, I would drive normally and not push the system until the correct software is loaded. I am not guaranteeing you will have an issue if you don't obey this rule, but I can guarantee that it is not a good idea to run the car hard with the wrong pump control strategy.
Power/Torque Gains with Upgraded Pump
As far the questions about the power/torque increase for the fuel pump...
We typically see around 10whp and 15lb-ft at the wheels with the upgraded pump on standard 2.0T applications. We have seen better numbers on the 2.0T's with the larger turbos like the Audi S3 where typical gains are around 15whp and 25lb-ft at the wheels. The gains we see on any 2.0T are due to the fact that we can be a little less conservative with the boost pressure in the mid-range where the OEM fuel pump has the most trouble keeping up.
However, the thing to keep in mind about the fuel pump upgrade is that the majority of the gains people are feeling have a lot to do with the "area under the curve" gains that the fuel pump provides, especially in the mid-range. This is where the upgraded pump and software really shines and gives the 2.0T that feeling of great bottom-end torque. Therefore, the gains you see in torque from the fuel pump will actually show in the peak torque numbers because the larger pump is doing what the OEM pump cannot due at the mid-range RPM's where torque is the greatest on these cars. However, the biggest gains for horsepower on a stock turbo car will show in the mid-range RPM's, well before the peak horsepower RPM has occured. This will be that "area under the curve" gain that I spoke of. So, you may not see a PEAK horsepower gain (most people do) but you will see a definite horsepower gain in the mid-range around the same RPM as peak torque. This allows for a broader power band and really helps the car feel punchy and pull hard without any dips in the powerband. Search Audizine for APR Pump and see how many customers can feel that mid-range torque and mid-range horsepower bump. These cars run great when the fueling system has a little bit of headroom.
I hope all of this made sense and I didn't confuse you. The gains are real, they just happen in the mid-range of RPM's.
Preventative Maintenance
Also, and this is the most important thing I can say here..
Did you inspect your camshaft and follower per the instructions in the fuel pump box before you installed the pump? This can be done so quickly and can save you tons of possible headaches in the future due to a warranty issue Audi/VW is having. If you haven't read the instructions in the box...go here...
http://www.goapr.com/Audi/support/fs...stallation.pdf
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