Ok so I'm new here just bought a 2010 fit sport manual. I just installed a Takeda cai and took it out for a drive. Its a little more peppy but that not the point. I have read that the vtec on the L15a engages at 3,500 rpm's, well at around 5,000 rpm's I heard a significant change in engine noise I figure maybe resonance in the pip but just curious what you guys think. And yes it sounded exactly like it does on the SI so if its intake resonance it sure is a nice sounding one.

 

It definitely doesn't engage at 3500, I think its 5300

 

according to all the info i have read it does here is a source Jazz VTEC Power some how it could be different but everything I have read up till now says 3,500 rpm's

 

i-vtec on the l15a engages at 3500 for cam timing/phasing, 5k or so for the lobe changeover if I read the system description correctly. My car has the K&N Typhoon short ram, it also seems to have a more distinct 5k bump from the lobe change.

 

What you read is about the first gen Fits, the GD chassis series. It uses a different VTEC system than the engine in the second gen Fits (GE chassis).

The current engine for the 2nd gen Fits is labelled L15a7. Most GDs use L15a1 (some countries use a2 and a4 also).

 

you can hear it, but you cant feel it. vtec.

 

5300 is vtec everything else is vtc.

 

What is vtc? VTEC includes both valve timing and the extent of lift, right? Or is timing also a product of the lobe change? I'm trying to condense my ignorance into a tidy package.

 

VTC is cam phasing adjustment- VTEC is duration and lift- Mark W.

 

Correct me if i'm off but I believe VTC is Variable Timing Control. Yes to your second question, VTEC stands for Variable valve Timing and Lift Electronic Control. iVtec includes those qualities and also uses cam timing..

 

I'd love to hear more detail on this. Does vtc not involve the cam profile at all?

 

^^ Yep- exactly what I said iVTEC isn't those two plus anything- the i signifies VTC, and the VTEC means, well, VTEC- a second (and sometimes third) cam profile which is switched on at certain RPM's based on either rev count or load, depending on tuning.

VTC doesn't change the cam profile- it advances or retards the cam timing to best effect either power or fuel economy, depending on driving needs- Mark W.

 

You guys are all wrong VTEC stands for... "Virtually Torqueless Economy Car"
It essentially means don't worry about racing and enjoy the mpg's.

Sorry couldn't help myself.

 

i can't hear a thing, and it's not fast anyway for me to care lol

 

You guys don't know slow, like I was saying in another thread I have a 96 escort w/ 1.9l sefi. Makes all of 88hp and 92 ftlb. Now that what an engine without vtec and 2 valves makes.

 

The funny thing is this thread is not about speed its about engine operation so how bout
Committobefit08 & EB go troll somewhere else

 

Need to read this, VTC tuning

 

Wait are you saying the L15 @ 5,000 rpm sounds like the K20 @ 5,000 rpm?

 

Oops must have messed up. I traded in my 99 trans am ls1 for a fit. Gas prices . So when I say "exactly" it's close enough in my book from what I was hearing every day

 

Don't get your panties in a twist noob. It's called humor try it sometime.

This is a informative forum...yes..but we like to rag on each other & ourselves sometime too. Remember we are on the same team....don't get defensive. Team Fit FTW.

Here since you have questions read up...

http://asia.vtec.net/Engines/LSERIESG2/index.html