Quote:
Originally Posted by ZDan
A little more on where my head is at on this. Bear in mind my only hands-on experience with tuning is swapping carburetor jets and modding mechanical advance curve in a distributor... I went from ~225 to 255rwhp on my 3.1 liter 240Z and spent less than $100 on "tuning"!
For cars like this one and S2000, N.A. and making good power/liter given the rev range, I take claimed performance gains from intake/exhaust mods with a huge grain of salt. If interwebz says header X with a tune will give me 25hp, I'm banking on 15hp, 20hp max, real-world back-to-back same day on same dyno (theoretical dyno tests here, that ain't happenin). Figure if tune is required for half of that gain, so I'm *guessing* maybe +10hp max for the header by itself, optimistically. Naturally, I'm *curious* what kind of power/torque (and A/F!) curves I'll see with just the header, before investing in either an OFT tune or (more likely) fully optimizing with EcuTek tune. Which I'll likely do whatever the header-only dyno results are. But at +10hp (optimistically?) header-only, I have to think fuel trims with the factory ECU are going to keep me in a mostly safeish area, also considering that factory ECU should(?) be pretty proactive with cutting timing with any knock detection. Not stating this as if I already know the answers, anybody feel free to comment if I'm way off base here!
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I would say with owning ACE and everything I have learned from it in reading every forum and subject about it, you likely won't see 10HP from the header itself. I can't relate specifically as I got the tune done pretty much right away, but likely you'll have a little more power mid range and very little up top (4-8HP maybe). ACE350 does not do any wonders at peak HP numbers even after a tune, at least not for the average folk. Its strongest gain comes in mid range. Can't comment much on the fuel trims, but again, I don't exactly see a major point in tracking with the header and no tune. If there is even the SLIGHTEST risk of something going wrong... why take it?
In terms of feel before you get the tune, you probably won't feel much of anything up top, but will feel a bump in mid-range.
EDIT: Here's a random thread to take a quick look at that shows the contrary from the big ACE gains you may have seen. Much like you, I took everything with a grain of salt when I was researching and buying into this. Either way I am not disappointed with my results.
https://www.ft86club.com/forums/show...23#post3201023