boost falls off at high revs

[dark_knight]

have seen this on two mates' cars.. the car boosts fine to the preset level -- no creep. the pick is good. a nice strong pull, but.. after about 6.5k revs, boost starts to taper off. possible causes..? one is a glanza v lazymatic (autobox) and the other is a mini cooper -- the new boy in town over here..

 

[triple j]

if u still useing stock actuator on the glanza it could cause that, is it the ct9.

 

[dark_knight]

yes. it's the stock ct9 with the stock actuator.. although coming to think of it, i also had the same occurrence on my td04 setup (internally gated). it was just once though and i'd hit the rev limiter then. hmmm..

 

[omikron]

happpens on myu car with upgraded actuator and ct9b

 

[triple j]

i would say if u changed actuator to a stronger one it could sort that little problem out for u. my gt hits the limiter at around 7400 so the safc says, so u would be loosing boost over the last 900rpm

 

[Murray]

Still on standard cast manifold? This will be causing it to choke higher up the revs. Losing boost.

 

[starletburkie]

my hybrid drops off a tad too

 

[dark_knight]

i noticed it on mine just because my 3rd boost light went out, otherwise i didn't have time to look at my gauge..

 

[omikron]

planning to do a td04 conversion soon with a 5e n/a exh mani (why the 5e mani looks like a better flower than the turbo one is strange to me ) ill look to see if it happens as well

 

[dark_knight]

the stock -fte exhaust mani is restricted because toyota was trying to cram as much engine into an already small car..

 

[ryandlang]

read the title as boot :/ haha

ive ported my cast oem manifold and it pulls hard to redline on a hybrid with hks actuator

 

[dark_knight]

ryandlang, boot falls off at high revs.. LOL! funny man..

 

[mark1991]

blowing engine to manifold gasket or manifold to turbo gasket?