black box next to diagnostics box

[pistol pete]

On my turbo rev1 there is a little black box where what looks like a vac hose should go in underneath..

next to it is what i would believe to be the hose but its been blocked by a bolt in the end and a t off for my boost gauge..
is this right what was it meant to do??

the boost on mine is runnin at 14.5 psi (set up to run at this)

cheers

[alan wheeldon]

Im not sure what it actually is but it is to do with the standard boost system. If you have an aftermarket boost controller then I dont think you need it.

Im sure someone will correct me if im wrong though

[Marf]

Its the pressure sensor for the stock gauge I believe

[zombie_dave]

in which case why are they on the na's aswell?

[Marf]

Well on the earlier tubbys I belive the map sensor was used a) to feed the gauge a signal and b) to operate the fuel cut.

On later tubbies the map sensor was used for all fuelling.

So on a rev1/2, it doesnt matter if its not connected, it fuels based on the air flow meter readings.

On an NA you still need a "pressure" sensor as they measure the vacuum the engine is under to work out the fuelling.

[pistol pete]

brill cheers peeps

[Steve-O 2007]

with it disconnected you wont hit fuel cut either

[toxo]

with it disconnected you wont hit fuel cut either

Which is a really good reason not to disconnect it IMHO

Marf's right pretty much. It's the MAP sensor, but the earlier engines don't use it for management.

[loudandproud205]

yup disscinnected mine till i get uprated fcd, how ever i do watch boost gauge alot just incase

[mr2turbo99]

i spliced into the hose that comes from underneath this black box with a T-piece for my EBC pressure. Will this be ok?

[alan wheeldon]

i spliced into the hose that comes from underneath this black box with a T-piece for my EBC pressure. Will this be ok?

Yes.

[Mr2_NA]

in which case why are they on the na's aswell?

Are you on about the diagnostics box with the air flow feed pipe?

Car runs crap with that off, it's just a vac pipe. Leave it

[marc GT Turbo]

also disconnecting the vac line from the map sensor , your dash boost gauge wont work .