When VTEC opens...

[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!

[Mugen Boi]

maybe tis is wat ppl describe as g-force

[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.

[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.

[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

[uraco]

did you get your power FC tuned? Seems like the AF mixture too lean when Vtec kick in. better get it checked.

[kacy]

tuning and perhaps setting of ur cams will be useful?? hmhmhm...

[bugis_kid]

wish to correct 1 point

fuel too much!

[18luohan]

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????

[Shamie]

sounds like its running to rich at crossover like the other bros mentioned

[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