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When VTEC opens...
Posted: Thu Dec 31, 2009 6:23 pm
by Owl
Hi all,
Need advice. Everytime when the VTEC opens, the car will be like been pull back by something, like it's becoming heavier. Driving without the air-con. B16A engine running Toda B cam with Power FC; stock intake manifold, stock injector and no brand 4-1 extractor.
Hope to have some advise so can go straight to the cause rather than spending time and money beating about the bushes.
Thanks and a Happy New Year to all!
Posted: Fri Jan 01, 2010 3:36 pm
by Mugen Boi
maybe tis is wat ppl describe as g-force
Posted: Sun Jan 03, 2010 11:31 am
by funksoulbro
i dun think there is anything wrong...at the VTEC crossover, power delivery is very linear, i doubt can feel much of a G-force anyway.
Posted: Sun Jan 03, 2010 3:36 pm
by Owl
Thanks for the replies.
Problem is it seems that the engine is more lively before the VTEC opens, and once the VTEC kicks in, the car is just like becoming heavy and won't go. =( Wonder is it because of the intake manifold that the air flow is not good enough to support the VTEC's air demands? Currently using a stock intake manifold.
Posted: Sun Jan 03, 2010 9:54 pm
by bugis_kid
1. vtec crossover too early . yours 5500 rpm and below open?
2. vtec solenoid spoilt , no vtec
3. fuel not enough
4. exhaust no big enough , or block somewhere
Posted: Tue Jan 05, 2010 10:51 am
by uraco
did you get your power FC tuned? Seems like the AF mixture too lean when Vtec kick in. better get it checked.
Posted: Tue Jan 05, 2010 8:51 pm
by kacy
tuning and perhaps setting of ur cams will be useful?? hmhmhm...
Posted: Wed Jan 06, 2010 2:16 am
by bugis_kid
wish to correct 1 point
fuel too much!
Re: When VTEC opens...
Posted: Tue Jan 26, 2010 3:51 pm
by 18luohan
Owl wrote:Hi all,
Need advice. Everytime when the VTEC opens, the car will be like been pull back by something, like it's becoming heavier. Driving without the air-con. B16A engine running Toda B cam with Power FC; stock intake manifold, stock injector and no brand 4-1 extractor.
Hope to have some advise so can go straight to the cause rather than spending time and money beating about the bushes.
Thanks and a Happy New Year to all!
your abv probl. resolve????
Posted: Sun Feb 07, 2010 7:53 pm
by Shamie
sounds like its running to rich at crossover like the other bros mentioned
Posted: Thu Feb 18, 2010 1:27 am
by Num3ga
Can't open my vtec the past few days. i already cleaned the vtec solenoid, refill engine oil, jump the solenoid... wats left is swapping ecu to see something has gone congo with my fuel maps. Anyone can help tloan a p28? Can't wait for ah hua to open still a few more days and it sucks driving to 5.7 rpm and i get engine stutter when vtec opens and i have to reduce speed. Must be my damned fuel map... grrr