vtec question and ek9 cluster

[samlex]

hi guys,

first post!

i have 2 question that i need answered.

1. vtec: i own a civic coupe vtir with a b16 in it, i have headers and cai.before when i just has the CAI, vtec you used to come on hard and you would know it. now with headers and CAI its not so hard. why is that? would an exhaust fix that?

2. i want to purchase a ek9 type r dash but that revs out to 10k, how will that effect my current dash that revs till 9k?

thanks in advance

[yellows2k]

I've got an ek with a b18c and have a ek9 dash, I had a STD ek cluster before and the needle would drop off and go past the end since installing the ek9 cluster i haven't tried to bounce off the rev limiter but it's screaming at redline
I doubt a change with dash will do anything

[dougie_504]

Maybe your exhaust isn't running as smoothly because you've increased the size of your header but not your cat/cat-back yet, therefore making it flow faster before it gets restricted again at the cat, rather than just running smoothly at one pace?

Also, what headers/how big?

[MikeyG]

What type of headers are they? Did you just change only the headers? Change the catback and Axel n you should be good

[samlex]

headers ae hytec tri -y copies.

correct only changed headers. been searching for a catback system for a while cant find one

[kcokla]

I've got an ek with a b18c and have a ek9 dash, I had a STD ek cluster before and the needle would drop off and go past the end since installing the ek9 cluster i haven't tried to bounce off the rev limiter but it's screaming at redline
I doubt a change with dash will do anything



a changed dash will NOT do anything. except look differnt.

your red line stays at where your ENGINES red line is - you changed the cluster, you visually changed the red line.

[cymax]

Rev limit will vary if you change or tune your ECU. Having said that, with a computer capable of reving higher than factory settings, your engine internals must be properly setup with appropriate settings/parts to cater for high reving.

[dougie_504]

cat and cat-back will free it up for sure :)

[trism]

a changed dash will NOT do anything. except look differnt.

your red line stays at where your ENGINES red line is - you changed the cluster, you visually changed the red line.


you mean rev limit.

[02gzm]

An aggressive vtec crossover is not always a good thing. A smoother crossover generally means a better power curve

[dougie_504]

An aggressive vtec crossover is not always a good thing. A smoother crossover generally means a better power curve


Would you mind explaining this further for me please? I guess it's kinda self-explanatory that if there's less crossover then it just means you have a smoother curve, am I right? If not please elaborate.

Because CRXAustralia just had a dyno day and a few of my mates were laughing at my EF8 because the crossover wasn't really noticeable (I can show you video) whereas my friend's EF8 (with full built head for $5500) had a huge crossover - but he only made 1.3kw more than me, on what the previous owner told me was a stock engine lol.

I made 99.4kw on a "low reading dyno" (according to mechanic) and my car was sort of the surprise-of-the-day thing, with everybody expecting it to pull shit numbers. A B18C7 CRX pulled 84.9kw for comparison.

[02gzm]

Each cam lobe will have it's own power curve. Where these two power curves cross is where you want your vtec crossover to be. That way you are staying at the optimum powerband throughout the rev range. The crossover won't affect the peak power unless the high profile lobe is disabled completely, as by the time you're in the higher revs you will be on the high profile lobe.