What is the normal range of rpm's you find you are using with your 258 under typical road driving experience? What feels or seems like 'red-lining' to you?
Mine seems like it is screaming when I'm over 2k. It feels like I don't gain much power after that. I typically drive around between 1000 and 2000 rpm. Only time I'm above 2k is when I get up on it to merge with traffic. Typically I cruise down the highway at 60mph around 1500rpm in 5th. 33s and 3.31 ratio.
I think Matt's Jeep is the exception and not the norm. I have no doubt Matt's Jeep can do it though. but Matt, wouldn't you agree that the torque is at the low end and you don't run the engine constantly at the high end?
I6s are not V8s. They're not high revving engines.
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My thinking is, the redline on a 258 is 4500 RPM, why not give the entire power curve the advance it needs?
I think my video above proves the 258 will rap out easily above 4K, if tuned well. Before I re-curved, mine struggled to reach 3500 RPM, and it sounded like it was about to explode above 3K.
Agreed. Torque is done by, what, 2,000 rpm. They'll continue to make power to about 3,500 but they're out of breath after that. They just don't have the head flow or camshaft for anything more than that.
I took mine to 4k a couple of times but you could feel the power drop off after 3,500. You're just revving it at that point. Might as well shift.
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