Well, i got the APR chip, and i love it, but i noticed 2 things:

1) WHen i acellerate under partial throttle through say 4k RPM it seams to surge a little. At first i thought it was the road, but it seems to do it regardless.

2)Under partial throttle, i notice much better power and much broader powerband. Expecially at low RPM (between 3.5 and 4.5). But sat full throttle and anywhere above 4.5k, it seems to be lacking in power. It isnt so much that the power goes away, but it doesnt increase. ANd my boost frops at around 4.2k. Is this normal?

 

Mine did the same thing. Then i put on the N75 race valve and that seemed to settle it out alot.

 

it takes some time for ecu to adapt to the chip so the surging is normal...happens to evryone who gets chipped. give it two to three weeks to adapt and the surging should go away. took mine almost 3 weeks before the surging subsided and then I upgraded the N75 and it was totally gone. if not you may want to replace your N75 valve with a "race" type N75. And yes the boost drop around 4000rpm is normal, the tiny K03 can not hold boost throughout the rpm range

 

btw give it some time to adapt before you start going all out WOT

 

Lmao, errr. should have told me that earlier. Lol. I have a heavy foot, and this chip hasnt helped.

 

What spark plugs are you running? Lots of peeps have surgin issues after chipping. With force inducted cars a colder buring plug will always help. A lot of guys use copper plugs like NGK BKR7E' or 6E's. They're a good plugs that will help with surging, but only last ~5K miles. I for some reason foul 7E's, while many others don't. Other options for a longer life plug that also has good results are the side firing Bosch platinums that were used in the older 5cyl turbo audis. Bosch F5DTC & F5DPOR. They are platinum but since the side firing design has a gap that's closer it's acts more like how a true normal design cold copper plug should.

Jeff from AG did some "extensive studies on both F5DPOR as well as other plugs. The F5DPOR's in reality are TWO ranges colder than stock. Bosch uses lower numbers to represent their heat ranges. NGK 6 = Bosch 7 = Denso 20, NGK 7 = Bosch 6 = Denso 21(22), and NGK 8 = Bosch 5 = Denso 24.

Because the F5DPOR's are platinum, they will foul at a much SLOWER rate than that of a copper. People who use F5DPOR's will notice their lower knock levels and lower ignition CF's because:

1 - The colder range of the plug, with more heat disappated
2 - The firing end of the plug is not a projected style plug, meaning it fires to the side closer to the kernel.
3 - It uses a SMALL gap (<0.024") which lowers the amount of combustion and temps.

These plugs that Jordan recommends do work, but I am still not a platinum fan, which is why I use BKR8EIX's at the current moment for my power levels. An "IX" plug is the iridium-equivalent of a BKR8E plug. Those wanting a bit more lifespan out of their BKR7E's, you may want to give the BKR7EIX's a try. The cost about $7-8 a plug, and will last for a good 20k+ (depending on your driving habits and state of tune). If you had a bone stock NA car, they can last as long as 60k+ like normal iridiums plugs should."