B18C: New cat back, earlier VTEC?

**shebangs** · 18-04-2006 08:12 PM

I just got my cat back put into in my DC2 VTIR. 2.25" mandrel bent custom cat back, 1 resonator into 4" outlet canon. Only other mods I have is Injen RD1450 intake.

Anyways, I've noticed the sound difference isn't noticable anymore when I hit 5800 (previous VTEC kick in point). Now I get a very noticable lift at 4700 but when I go past ~5800, no sound difference at all. It does sound pretty crazy though.

Is it possible the exhaust has changed my VTEC point? Or is this normal and my VTEC is still coming in ~5800 as normal?

And if I can ask a completely different question. On idle, the car makes a very noticable rattling sound. Upon investigation, it's the rear bar vibrating. Only happens on idle. Whats the fix for this? Can I put something in between the rear bad and the canon? Piece of Dynomat sound deadening maybe?

Thanks,

**T-onedc2** · 18-04-2006 08:18 PM

Simply not possible for it to have altered vtec engagement point but can affect flow of gas, ideally positively to gain some extra torque.

As for the rattle get down there and check to see if there's any contact between the exhaust system and part of the car, or perhaps the sound vibrations are causing a loose bumper mount to rattle.

**dudeling7** · 18-04-2006 08:40 PM

maybe because you got the cat back there is a little extra torque down low so its not as much of a hit aroud vtec anymore....the xhasut has smoothened the curve out thus being less noticeable?

**BeeH** · 18-04-2006 09:27 PM

B18C, 5800 kick in point?? thought vtec on a B18C engaged at 4500??

**shebangs** · 18-04-2006 09:49 PM

Originally Posted by BeeH

B18C, 5800 kick in point?? thought vtec on a B18C engaged at 4500??

Thats half my question. Maybe my 5800 was wrong?

Bottom end has definately improved alot, and straightened up a bit. But I havent had a chance to take it for a decent strap.