So on my way to work at around 9 this morning I had an open stretch of road on 400 before the ramp onto 285E. After dodging a couple of stray bales of hay lying on the edge of the road (WTF?) I laid into it in 5th gear to see how much boost I'd picked up in the cold weather. When my car first got tuned it was on a hot as hell afternoon in Orlando and the most boost we saw was a little over 23psi. This morning I hit 24.7 and probably would have hit 25 if I'd started at a different RPM. hnoes: Time to start datalogging on the way to work to make sure I'm not getting any knock with the extra boost. Anybody else notice the difference?
I was about to post something about the cold weather and how my car now feels especially zippy these last couple of days. No idea what my boost is (lack of boost gauge being the problem there ), but the car does feel much more 'peppy'. Shame that cold sometimes = ice. Nice having the extra power, but not much fun not using it on the back roads I take to work in the morning.
yes sir, on 93 octane the evo9 is good for 23-24psi spikes tapering down to just under 18psi at redline. personally, I'd rather have the extra 500cc of displacement of a 2.5L motor.. but the ability to run a relatively high amount of boost is nice. But now that it's so cold I don't want to overboost too badly.
23 psi on pump must be nice... but my limited knowledge of tuning always told me that safe boost and timing are directly related to octane and compression... whats the compression on an EVO?
8.8:1 CR I hit 25psi even on my way to work today. I did a fourth gear pull and my AFRs were a steady 12.0-12.1. I do believe she's running too lean, captain. I guess I'll do some logging on the way home to see if I'm picking up any knock counts. Last week I was seeing 11.7-11.9 AFRs and I wasn't knocking.. but I get the feeling I'm pushing my luck now! I'm starting to have second thoughts about running a manual boost controller, but frankly I know more people who've gotten headaches than happiness from EBCs.
:fawk:4G63:fawk: stupid strong motor jokes aside, im pretty impressed... u guys have more compression, leaner AFR, and can run more boost on pump... must be sweet... can anyone explain how that works?
Even with forged internals and a cast iron block, it can't run that lean long term. Everyone I have talked too thought it was nuts.
Yeah, I'm gonna d-log it a couple of times and then probably back down the boost. Damn you good weather! :rofl:
Ok so I did a few pulls. I'm no expert tuner but I could see what was happening. With more boost and cold, dense air I was reaching a higher set of load cells and more fuel was needed. I sent the ROM file out to the guy that did my tune and he made some changes. It was pretty cool to see that the changes he made were exactly what I expected to see, it confirms I'm getting the right idea of how to tune. The good news is that even my worst pull only yielded peak knock counts of 7, which isn't bad. It's enough knock to require attention but not enough to burn up anything. So now that I have my original flash file from when I first got tuned and now this updated file - I basically have a "cold weather" and a "warm weather" tune I can switch between depending on the climate. By the way if you have a modified turbo car I can't recommend the Zeitronix wideband enough. With the addition of the Kavlico precision MAP sensor and the LCD display it's invaluable. I don't have the optional EGT probe yet but as soon as I go alky/meth I'll add that as well. You can even get an alarm module that will sound off a siren if you go too lean, EGTs go too high, etc.
Turn your MBC back down to 23 psi if u want your car to last, as that is the highest boost most tuners recommend
Doug retuned my car on Nov 4, fixed the AFRs and the final numbers were 348whp/351tq at around 23psi on pump. Thank you, TopSpeed and thank you cool air.