Virgin Head...Friday night engine porn NSFW :)
#21
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By "nothing fancy" I still mean 180-200whp on pump gas, NA.
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After reading Quinn's build over on cr.net, its had me thinking about building the BP4W head I have sitting on the shelf and skipping VVT, but I'd hate to give up the low/mid range torque.
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I've heard that as an excuse for not installing a larger turbo (don't want the lag of a bigger unit) except that on the track or during spirited driving yours rpm's will already have negated that point. BTW, I'm not advocating a position but just making an observation.
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I've heard that as an excuse for not installing a larger turbo (don't want the lag of a bigger unit) except that on the track or during spirited driving yours rpm's will already have negated that point. BTW, I'm not advocating a position but just making an observation.
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Ah, no. The idea that VVT engines only make additional torque below the lowest RPM seen on track is quite fallacious. Especially with a 5-speed, ~4500rpm is not an unreasonable minimum RPM to expect on a road course.
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My point is that larger turbos have a reputation for producing more lag than smaller turbos, which is true. However, in a track environment your rpm's are usually high enough all the time to keep the turbo spooled up. At a stop sign from idle, different story.
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