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Originally Posted by PulsarBeeerz
What is your experience for concluding there would be a lack of gains?
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Where I've seen folks get decent gains in the past with Extrude Honing, it's either been on parts that had pretty poor castings to begin with (E.G. some older watercooled VW intake or exhaust manifolds) and the process in combination with some manual grinding/porting cleaned things up a lot, or where it was used to pretty aggressively increase the volume of the intake runners (E.G. on a Hyundai Tiburon V6 upper and lower intake manifold, which was then also port-matched to the heads - ultimately, with that car, fabricating an entirely new upper manifold was a better option because the plenum also needed to be much larger for better top end).
The casting on the stock 2017+ manifold looks pretty clean already, so I'd be surprised if Extrude Honing improved flow that much. I absolutely could be wrong though.
Quote:
Originally Posted by PulsarBeeerz
2013 IM vs MY17 extrude honed. I never bother bolting the MY17 up before the processing.
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That would make a bit more sense, since it was shown that there are gains with the 2017+ manifold swap alone at the very top end of the power band because it seems to fall off less after the peak than the pre-2017 plastic manifold. Pretty sure there was a Drift Office dyno on it somewhere. Peak HP gains were minimal (1-2 hp at best), but it didn't drop off as badly at the very top.
People seemed to talk all kinds of crap about the manifold just "being pretty" and not doing anything because the dyno only showed a 1-2 hp peak gain, and conveniently ignored the HUGE difference in the post-HP-peak RPM range.
It's kind of like the argument some people have about the BPB's being a waste of money because they don't add a bunch of peak HP (which they don't), but there are substantial gains in "non-peak" areas that make them worthwhile for me because I don't particularly care about the peak numbers, and more about fattening the middle of the curve.
Quote:
Originally Posted by PulsarBeeerz
Oh yeah, I ran the BPBs before with a tune calibrated for them as well. OFT offered it years ago. The more bolts on you add the less they made a difference. I ended up removing them to run E85 which was the best bang for the buck NA.
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I've seen Shiv's posts on what the suggested changes are to his tunes for the BPB's, and have been bearing those in mind while working on my tune. Still early days with that yet, though.
Only other engine mods I'm likely to make will be the ACE A350 headers I have sitting in my attic, a Fluidampr to smooth things out a bit, and *maybe* a Grimmspeed intake. Any further money will be spent either on dialing in the suspension a bit more, or on track time to improve the nut behind the wheel...LOL.
Unfortunately, E85 isn't an option where I live, so I'm stuck with optimizing for Shell 93 octane.
