Boost

[UK-Rushy]

hi everyone ow ya doin?

ma mates just baught a 4 door r32 skyline which is pretty much stock... turbo back exhaust, fmic, exhaust manifold, now the question is on his boost gauge its reading 13psi boost but we cannot find a boost controller anywer?? how is the boost been controlled? am i lookin in the rong place?

cheers

[blind_elk]

Should find that boost is controlled by the wastegate actuator on the turbo. Extra boost - over about 10psi - will be controlled by a bleedoff arrangement.

[2LV8ETR]

The wastegate actuator can also be exchanged for one with a different pressure rating.

[UK-Rushy]

yeh i think its got a replacement as i can only see a vacuum line goin from the wastegate to the turbo. also there is a switch in the cabin and when it is pressed it drops revs or puts them higher... depends which way you look at it. what would that be for?

cheers

[Jmaac]

something thats putting additional load on the engine i.e. drawing more current from the alternator or engaging a clutch for belt drive etc.

[SL33K]

Is it an Auto. Some Autos have a switch which i am not sure what it is for. somethin live over drive. it is used when driving on highways and when pressed it drops to a lower gear i think. not sure though

[UK-Rushy]

Is it an Auto. Some Autos have a switch which i am not sure what it is for. somethin live over drive. it is used when driving on highways and when pressed it drops to a lower gear i think. not sure though

no its not an auto. looks aftermarket. not too sure what it is then lol

[r33-sky]

acuator - adjust it.

[mad082]

get pics of both the switch and the actuator.

you say that the hose from the actuator just goes to the turbo. do you mean it is only very short and goes to a nipple on the compressor housing? if so then the turbo isn't the stock one either as the stock turbo doesn't have a nipple on the compressor housing.

as for the switch making the revs drop, it would have to be something that is adding extra load as someone said. how much does it drop it by? only 100 or 200rpm? could possibly be an aircon switch if the stock one is dead. maybe try seeing where the wires go

[UK-Rushy]

get pics of both the switch and the actuator.

you say that the hose from the actuator just goes to the turbo. do you mean it is only very short and goes to a nipple on the compressor housing? if so then the turbo isn't the stock one either as the stock turbo doesn't have a nipple on the compressor housing.

as for the switch making the revs drop, it would have to be something that is adding extra load as someone said. how much does it drop it by? only 100 or 200rpm? could possibly be an aircon switch if the stock one is dead. maybe try seeing where the wires go

oki il get some pics up. as for the switch there are 3 wires from the back of it, 1 disappears into the dash an 2 disappear int the engine bay