What happens around 3550 to 3600 RPMs?

The truck goes from lug lug lug to ROOOOMP just after 3500 rpms.

I have an AFE intake and can hear a distinct audible difference at the switching point. The intake path opens up, whether it be the TB or valving or something...

I was curious if this is an Atkinson to Otto switch, or just a variable cam adjustment or what? @OVTune may have the most knowledge in this, but I figure others likely know.

Thanks!

 

https://www.google.com/url?sa=t&sou...FjAAegQIBBAB&usg=AOvVaw0JNf88hg64WFhcJj5HVjb8

 

Read the PDF. The answer you seek is in it.

 

Thats 109 pages. Got the cliff notes version?

 

VVTI YO

 

I think it says " at 3500 rpm the engine kicks like a mule and goes from lug lug lug donkey to romp romp like racehorse that's been shot in the ass."

 

People on this forum helpful af on a Friday I see lol.

 

Hey I tried to be helpful.

 

Dude the question was answered many times I don’t know what the deal is.

 

"I know the answer to your question, but instead of telling you I'm going to hand you a 100 page document and tell you to read it, because reasons. Get fucked."

 

It's a small pdf. I can't help it if y'all don't wanna read.

 

that's just as helpful .

ok. ACIS actuated VVTi timing advance.

 

Dude I may shit post with the worst of them but I just gave a link to a pdf the OP and anyone else interested can read and become more knowledgeable about the engine in their truck. That my friend ain't shit posting.

 

Your response was a legit great answer to the question "Hey, does anyone have something I can read to become more knowledgable about the engine in my truck?" Cool resource, bookmarked. Wasn't the OP's question though.

Anyway, now that I've done enough shitposting, thanks to folks who answered, I learned some things.

 

Mind sharing which part of this 109 page document explains it?

 

It’s true. The shitposters drop the best knowledge.

 

That Friday is a bad day to start a thread on info covered a 1000 times in others
Especially if you get hurt easily.

 

Having owned a S2000, I can say that yes this truck drives like it has vtec. More like the B16 though, gutless until 5500, and then less gutless.