Was it 5750? I don't think it was but whateva. I never liked the idea of having those secondaries anyway. for the stock GSR cam they were cool but not for a more agressive cam like mine.
So if I'm understanding this right, VTEC kicks over twice? Once at 4,400 and again at 5,750?
NO, you got it wrong, at 4400 your vtec kicks in(VTEC ONLY)and at 5750 your secondary butterfly in the intake manifol opens up for more air and that's actually sometimes louder than the vtec itself. NO YOU DON"T HAVE A 2 STAGE VTEC!!!!
Most people assume the VTEC kicks in at a specific rpm, but actually, the ECU decides when it will allow it to kick in with few requirements. The ECU can decide not to activate VTEC if it senses that there is not enough engine load to justify the high-cam usage. Like the ITR P73 ECU, it engages VTEC at 5700 rpm (and NEVER sooner under heavy load conditions (ECU running in open loop or power mode); but if the ECU doesn't sense a heavy load (ECU running in closed loop mode or 14.7 A/F mode *ECU reads O2 sensor to determine 14.7*), the VTEC will only kick in no later than 6200 rpm. So depending on how you drive, the VTEC can kick in anywhere from 5700 to 6200rpm.
For GSR ECU, the concept stands at different preset rpms.
And yeah... VTEC can only switchover once...
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All Integra GSR Parts for Sale, prices are shipped anywhere in the U.S.: Jackson Racing Vtec Controller Brand New in Box
Engine temperature is also (at least) one of the factors.
A year or so ago, I temporarily connected a piezo buzzer to the VTEC solenoid valve which controls the oil pressure to engage VTEC cam, it is clearly evident that until the engine warms up, VTEC did not kick in.
Same thing happens if you left the car in neutral and revving the living-daylight out of the engine the VTEC would still not be engaged, in this case perhaps relating to either engine load or speed sensor output.
Originally posted by Tuan GSR VTEC switchover, kickover, crossover, activation, turn on, hits, ....whatever....
Hybrid Fever: Why do you persist with this question?
You posted this question already on N/A forum and I sent you a PM answering this very very basic question already that has been answered a million times over on Honda boards across the world and all it takes is a simple search.
Do you NOT believe me ?
For the record, VTEC switchover happens once and only once.
The GSR (b18c1) has a 4400 rpm VTEC switchover. The butterfly valves in the GSR dual stage intake manifold (IM) open for the 4 shorter manifold runners at 5750 rpm...this sound in the GSR at 5750 rpm is NOT VTEC: it is 4 extra runners openiing in the IM to allow more air in at the upper rpms (i.e. all 8 runners are now open: 4 short and 4 long).
If you have a Skunk2 single stage IM on the GSR you will not get this "sound" at 5750 rpm. If you plug the IAB dashpot vacuum line on the GSR IM, you will not get this sound at 5750 rpm.
This is so basic, it's sickening.
The b16a has 1 and on1 VTEC switchover...at 5700 rpm.
Can we move on now please?
Ok relax...I didn't check my PM box, I just wanted to know because I'm trying to decide which will be a better street motor. It seems to be the B18c1 would be since it's VTEC crossover happens over 1000 rpms sooner. Thanks for the info.
Ok relax...I didn't check my PM box, I just wanted to know because I'm trying to decide which will be a better street motor. It seems to be the B18c1 would be since it's VTEC crossover happens over 1000 rpms sooner. Thanks for the info.
Is funny because SHO will pop up a box telling you that you have a PM once you login. Anyways, whatever.......
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