Pat

I've had MTM stage three for a year or two now. I've had surging issues and recently changed chips. Apparently, because I live in Denver and can only get 91 octance, Hoppen sent me a chip they use for the Italian stage three, because they have crappy gas there, too. With the first stage three chip, I would spike at 21 psi on 91 octane. With 96 octane (mix), I saw spikes as high as 24 psi.
I now have the "latest and greatest" version of MTM's stage three software, and am only spiking at 16 or 17 psi. It's very smooth, and feels every bit as fast.
I'm wondering if I can get some of the boost back and increase power safely. Any ideas or thoughts as to why there would be such a big difference in chips? Apparently the new program is the American version designed for 93 octane.

Slye A4

euro chip in american car.

phoneyman

how can it feel just as fast with that much less boost?

JA4T

if the program has less peak boost but designed to reach that boost quicker by coming on sooner...may seem just as "fast".
J

shep 1.8T s3

maybe less boost/ better tuning = less to no timing pull = comparable power.

phoneyman

now i get it...real quick haha whats timing pull again?

shep 1.8T s3

the ECU basically tells the engine that something is wrong, in the example above maybe he is pinging. If we can for a second assume that the engines spark plugs fire at Top dead center, when the car pulls timing it will fire a few degrees after top dead center, when compression in the chamber is lessened and the chances of something going wrong (like pinging)greatly reduced. As a result not as much power is made.

phoneyman

thanks

Andy_FL

Though there have been a handful of kits around here, seems like they've all been passed on. Have you discussed your observations with Hoppen? Good luck!

Andy

Pat

FWIW, I've never heard pinging in my car.