I've notice that majority of all prelude has Vtec controller. Is it because the stock vtec cross over sucks? Just want to make sure, where is the stock vtec cross over at? What is the best vtec cross over for a prelude with I/H/E? Sorry, we just bought a Prelude and still learning about it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.8LGSR &raquo;</TD></TR><TR><TD CLASS="quote">I've notice that majority of all prelude has Vtec controller. Is it because the stock vtec cross over sucks? Just want to make sure, where is the stock vtec cross over at? What is the best vtec cross over for a prelude with I/H/E? Sorry, we just bought a Prelude and still learning about it.</TD></TR></TABLE>

The main purpose of VTEC controller is to fine tune the fuel curve. Changing the VTEC engagement point without tuning the curve is pointless. Stock engagement is around 5100k or so. Nobody can tell you where to set the VTEC crossover at. You have dyno tune the VTEC controller to see at what RPM is best to set at.

 

stock vtec crossover is at 5252. but an H22 w/ i/e/h, a vafc is pointless, b/c to tune it right you'd need to pay for dyno time which is mucho $$$. money that could be spent in better places.

 

ok and do you know what you are talking about... with a vafc 2 tuned correctly it is possible to get a midrange bump as high as 20 whp and then when vtec kicks in peak hp can increase to +8 or so.... that is not bad it takes dyno tuning but smooth vtec engagements where you really do not even feel it engage makes power not a kick ----

as far as vtec engagment my jdm h22a hits at 5450 rpms according to V/T Info on vafc -- not yet tuned ......

 

I was seening preludes with I/H/E and vtec controller. But why tune it with only I/H/E? I can see tuning with cams or FI. That was my question.

 

the h22a like almost every honda vtec engine can be leaned out a little in order to make more power... but you need a dyno like they said to find out where your car runs best. You tune a car to your setup and it does not really matter if you have cams and a turbo (which I would not use a VAfc for anyway) or just I/E/H you will gain some horsepower by adjusting your air fuel ratio and lowering the vtec point. Search the forum and look at some dynos, lowering the vtec (most N/a cars runs best at around 5000 rpm engagement) will shift the cruve upward thus making some extra (5-10 whp) peak horsepower... plus they do some awesome monitoring things,,,,

 

not sure about 20 whp w/ i/e/h. thats pushing it

 

i reccomend getting a vafc with i/h/e and oter mods

i gained 7whp from tuning, which brought me to 183 at 100 degree weather...

i spent 140 on tuning and 200 on my vafc2

 

ya, ive got one, and i love the monitoring functions, and with I/H/E, you can see some considerable gains with the right kind of tuning...also depends on the quality of the header and exhaust as well.