Outer Limits 4x4 Board

I have a TD42T GU and i am fitting a boost guage this weekend before i get my Turbo Upgrade done.
Where does the line connect to the engine?


thanks Grant

With my 3.0L i had a fitting brazed into one of the intercooler pipes and plugged onto that.

I'm not up with diesels, but with other turbo street cars the boost gauge (especially one that reads Vacuum as well...) is plumbed directly off the inlet manifold after the throttle body otherwise no vacuum will be read.

It's usually just find a vacuum line off the intake plenum and put a t-piece in to add the boost gauge line.

There should be a little "stub" on the crossover pipe to connect it to.

I searched my inlet manifold and didn't find one useable vacuum line (all had solenoids and crap connected to them). So just went straight for the intercooler pipes.
On my old puslar it wasn't a problem had 100 hoses it could t peice into.

Most diesels dont have throttle bodies so dont read vacuum anyway
Ive got a 30 psi boost/vacuum gauge and it has never dropped below 0 but does reach up around 25 on a good day

There is a line that it T`ed in the crossover pipe that comes from the turbo already, can i connect into there ?

does yours have the factory intercooler,

if so, there should be a line that runs from the intercooler back to the waste gate, (at least there is on the RD28) we teed into there and it works fine,

ozy1 wrote:does yours have the factory intercooler,

if so, there should be a line that runs from the intercooler back to the waste gate, (at least there is on the RD28) we teed into there and it works fine,

No it is a 1999 model before the intercoolers, but it does have a small rubber tube runing from the crossover pipe to the turbo

Yeah just chop that sucker and fit a t piece

GUEEY wrote:

ozy1 wrote:does yours have the factory intercooler,

if so, there should be a line that runs from the intercooler back to the waste gate, (at least there is on the RD28) we teed into there and it works fine,

No it is a 1999 model before the intercoolers, but it does have a small rubber tube runing from the crossover pipe to the turbo

how far along the crossover pipe does that tube connect?

ideally the gauge should be connected into the intake manifold, as fitting it at the turbo end will read differently than at the manifold end. its the pressure in the manifold that counts.

tweak'e wrote:

GUEEY wrote:

ozy1 wrote:does yours have the factory intercooler,

if so, there should be a line that runs from the intercooler back to the waste gate, (at least there is on the RD28) we teed into there and it works fine,

No it is a 1999 model before the intercoolers, but it does have a small rubber tube runing from the crossover pipe to the turbo

how far along the crossover pipe does that tube connect?

ideally the gauge should be connected into the intake manifold, as fitting it at the turbo end will read differently than at the manifold end. its the pressure in the manifold that counts.

definatley shouold be on the manifold to read correct boost pressure. had one fitted to a turbo skyline that had a fuel cut problem it was fitted at intercooler pipe read 12psi. fitted to correct line at manifold and it was actually boosting at 15psi and on the skylines it fuel cuts at 12.5psi. re adjusted the boost controller all good.

ozy1 wrote:does yours have the factory intercooler,

if so, there should be a line that runs from the intercooler back to the waste gate, (at least there is on the RD28) we teed into there and it works fine,

the line i w3as talking about on the intercooled model, is the waste gate actuator line, what waste gate actuator on these models actually gets its pressure form the intercooler, the fittinf is about 50-100mm from the inlet manifold, so its as close as possible without drilling and tappin the inlet manifold,

Had a good look today in daylight.
i dont know what i was smokin last night!
the line from the crossover pipe goes to the a diaphram on top of the fuel pump.
can i connect the boost gauge it that line?

Grant

GUEEY wrote:Had a good look today in daylight.
i dont know what i was smokin last night!
the line from the crossover pipe goes to the a diaphram on top of the fuel pump.
can i connect the boost gauge it that line?

Grant

if im correct, i havnt had a god look before, but id say that is the boost compensator on your fuel pump, so you should realistically be able to TEE into that line, but wait for others opinins first,

when i fitted one to my Rodeo, i was told not to tee into the boost compensation line because you could upset stuff..... i drilled a hole in the crossover about half way between the turbo and inlet and tapped it 1/8 BSPT and put a quick connect fitting in it... worked great! When i intercooled it, i left it in the same spot.

just chop the boost compensator line and put a tee into that. That's what I did and it was quite acurate compared to the dyno it was parked on

By connecting to the boost compensator line, you are effectively delaying the fuel adding process provided by the pump.

It will WORK - there is no doubt about it, but you may be robbing yourself of some power, or at least delaying it. The hose adds volume .... it takes time to fill the extra volume to the same pressure.

Same principal applies to fitting an intercooler - increases lag due to extra volume in the intake manifold.

I tapped a 1/8BSP hole in my x-over piper (close to the manifold) - put a compression fitting in for the boost gauge ... easy ...