New Turbo Setup, Cant Control Boost

[jarrod83]

Hey guys, have just gotten a new top mounted manifold kit with an external wastegate its a gt35r 0.82 on a rb25 with a 44mm tial wastegate being controlled by a blitz sbc i colour

No matter the settings on the controller the boost is very laggy comes on very late, the ebc doesnt have any control on the boost ive tried a few things and I'm stumped.. I've tested the wastegate with 25psi into chamber A and it opens, but air comes out the sides of the wastegate im not sure if thats normal??

i am also having a problem when i put the clutch in the car stalls.. i have a gfb plumback on the car and i thought with it plumbacked it was meant to stop the stalling issue?

anyway any help with the problems would be greatly appreciated

Jarrod

Edited January 2, 2009 by jarrod83

[axe s]

Have you connected the boost controller properly? different for external W/G,

What ecu are u running?

Has it been tuned?

When does it come on boost?

[Bliksem]

What other mods do you have? Aftermarket ECU?

Also What sort of manifold? And what RPM do you start to see boost?

[jarrod83]

pretty sure its set up right as per the blitz sbc manual, the IN goes to the cooler piping, same as the B chamber, n chamber A goes to the OUT on the sbc, the tial instructions are similar

car has only been mildy tuned, slightly on the rich side of things mid 13s on light cruise, and low 11s on boost, havent tuned it up any more because the new 5 puk clutch is already slipping and i cant turn the boost down

starts coming on boost around 4000 and kicks in low 5000rpm... its more when im at say 5000 revs in 3rd n i put the foot down it takes a far few seconds to come on boost

mods plazmaman plenum, nismo 740 injectors, power fc pro, nismo fuel pump, 6boost manifold, tial waste gate, gt35R 0.82 turbo, 3.5inch dump n front pipe n cat 3inch back from there

[l0WRB]

depending what kind of manifold you have, if it's cheap shit id be looking at the tiny pathetic wastegate hole size.

[Bliksem]

6boost manifold, tial waste gate,

There was a thread somewhere where ANDRU had problems controlling boost on the 6boost manifold too. I think he ended up going with a 45 or 50mm gate...

Edited January 3, 2009 by MintR33

[WHITER33GTS-T]

I have heard the same about the 6boost manifolds as the wastegate comes of the collector and doesnt flow properly....?

Either way I bought a 6boost manifold and will find out in a week or so how it goes. I have a 60mm turbosmart gate on my T51r setup.

[femno]

Does it spike to 17 straight up or does it build from say 10psi and then creeps to 17?

Eliminate the boost controller by just running a signal line from the IC piping to the bottom side of the gate and see what happens then.

If it still creeps to 17 then gate is too small or manifold design is rubbish.

If it doesnt creep and is fine, its the controller connection/setup.

[jarrod83]

my wastegate is mounted off the turbo's exhaust housing, was told it offers better boost control

the boost starts building at little after 4000 and slowly builds to abit over 5psi then the big boost hit kicks in n it jumps straight upto the 17psi, its a bit hard to tell if it spikes to 17 or if it holds there cause it all happens pretty quick

I'll hook the wastegate to the cooler piping later when it cools down abit, what sort of boost should it hit when its set up like that

[jarrod83]

Hey guys solved the problem cheers for the input, would of been alot easier if the wastegates come with instructions... never removed any of the springs from the wastegate, opened it up took out the big spring and all good now