Yet another VTEC question

[ChrisCantSkate]

Originally posted by RU_Teg
I feel the Vtec kick in in my boys 90 GS...when he hits 4500 rpm you hear a pop in the exhaust and it becomes louder and the car pulls like crazy...

um... 90 integra? no.


the first vtec engines in america were the 91 nsx's followed by the 93 preludes, then the GSR's in the 3rd gens i believe. you guys are hearing your secondary runners opening. vtec on sohc engines is very minimal... even on a stock h22... all you really hear is the runners opening at 4800 then at 5100 when the vtec cam lobe enables there is the power increase. vtec is not like a turbo or anything. do some reading in the high performacne section on vtec. it is not a save all power feature, expecialy for the sohc engines.

oh and vtec engages at 5150rpms on a h22, and somewhere around 5.5-6 for b16's and b18's i beleive. s2k's are also about 6k rpms.