Quote Originally Posted by on-tec View Post
hey guys, im kinda new to this so im sorry if i posted this in the wrong section ..... but hear goes.

OK so i have an eg 3dr hatch back and its got a b18cR [b18c7] motor in it, dc2R gear box and a few mods such as [ Headers / Intake / and i think its got some sort of brass button clutch witch makes it kinda hard to ride in the clutch ] etc.

i don't know if my ECU has been re mapped or flashed because vtec kicks in at 6000 not 4500 and redlines at 9000 instead of 8200.

anyway hears my Delmar when im driving normaly [i.e changing gears between 3000 - 4500] gear change is smooth and enjoyable........ BUT!! when im changing gears between [ 8000 - 9000 ] going from 2nd - 3rd gear 90% of the time i hear a crunch ! , some times it wont make any noise and feels fantastic but most times it crunches ! , now i have tryed different techniques i.e change from 2nd to 3rd closer to 1st gear, then tryed closer to 5th gear , and obviouslt the striaght forward 3 gear. the only way for me to minimize the risk of a crunch or shaveing sound is by slowly change from 2nd to 3rd........ but then agian it depicts the point of keeping in vtec -_-

i dont know whats making it crunch or shave sound but its realllllllllllllyyyy anoying! it feels like my gear box is going to shit its self!

please someone help me!!!!!!

Gear 'crunching' means that your 2nd-3rd synchro is on it's way out. Very common. Will require removal of gearbox and replacement, which is expensive (I doubt you could get it changed for less than a grand). If you don't want it to crunch then don't change at high-revs, or you can rev your car to 9k in 2nd gear but let the revs drop down to about 2-3k RPM before putting it in 3rd, but then if you're going around 100KM/hour and change into 3rd at 3000RPM or so you will put a lot of strain on the gear itself as the revs will need to jump up.

If you keep crunching it then the synchro will sh!t itself.

This is something you should check for when you buy a Honda.


Also, VTEC is normally about 5200-5500 RPM. After a tune it will often engage around 6000 RPM.