Boost - how is it limited?

[Stu C]

I know it's reduced in 1st and 2nd, but is it reduced by other factors as well? Coming from a DOHC VTEC engine, it wouldn't go onto the aggressive cam unless there was enough oil pressure, the engine was at operating temperature and throttle position was at a certain point. How about the MS3?

 

[BlackJack]

From what I hear, the MS3's BOV has a boost control on it.

That and the gear ratios are short.

Then again, i don't know heh.

 

[stevekt]

If you add stickers to the fenders that should free up the boost.

 

[Craighjr]

No the boost isn't like VTEC. Honda was making sure you wouldn't blow up the motor by having low oil pressure and then switching to the big cam (which required oil pressure to acctivate). Our boost is limited in 1 and 2 but it is always limited it isn't dependant on conditions setting to the allow more boost.

 

[dparm1984]

I was under the impression that the reduced power in 1/2 is also due to the drive-by-wire system not opening the throttle completely?

 

[Craighjr]

I was under the impression that the reduced power in 1/2 is also due to the drive-by-wire system not opening the throttle completely?

I don't know if thats true. I think (99% sure) that my Standback runs 15 psi like I programmed with out any throttle control.

 

[redspeed]

I know it's reduced in 1st and 2nd, but is it reduced by other factors as well? Coming from a DOHC VTEC engine, it wouldn't go onto the aggressive cam unless there was enough oil pressure, the engine was at operating temperature and throttle position was at a certain point. How about the MS3?

The ecu controls the boost via the boost selenoid, which is connected to the internal WG. The ecu decides boost level depending on gear, steering angle, throttle position and if it detects wheel spin.

 

[dmention7]

I was under the impression that the reduced power in 1/2 is also due to the drive-by-wire system not opening the throttle completely?

If I'm recalling correctly, the ECU does override the throttle position, but it is at higher RPMs in any gear... part of the reason why the speed3 falls on it's face after 5500rpms.