no boost at 1st gear ....

[nismo1003]

in driving condition, at 1st gear, my boost gauge read 0 psi at any rpm ? why is that? second gear at 6000rpm , hit 7 psi. is it mean some where boost leak?

For who those who has a T3? at what RPM will you hit full boost?

Vaccum/Boost source line: Manifold > BOV > boost gauge > FMU ? who is using a FMU/ what's ur setup? is it not good if I put everything in the same line ?

[MikeMurphy]

maybe because you dont have enough flow for long enough in 1st gear to make positive pressure?

try maybe accelerating up a steep hill.

are you running the stock exhaust?

[C-Kwik]

If you're running a T3, you should feel boost very quickly in any gear. How does it respond in second? What RPM will it hit max boost at?

I used a splitter to run my FMU, boost gauge and wastegate all off the same signal with no problems. If this were to be a problem, it would likely cause an overboost problem rather than an underboost problem. Any wierd noises? Make sure everything is sealed well, including all hose connections(use a socket wrench to tighten these, not a screwdriver). Check for any leaks in the xhaust manifold as well. You'll probably hear this if there is a leak there...

[Structure240sx]

i make no boost in 1st also. but i'm convinced its jsut cuz there is not enough load to spool up my to4. i have a fidanza 11lb flywheel and enjuku 11lb D/S. its good and bad to me i feel i wont have to worry about traction with no boost but also i could be goin alot faster since ill be upgrading to drag radials full time after the winter and i get my jwt ecu in. so i might swap in a stock resurfaced flywheel i have sittin around not sure yet

[CoolBlue]

The reason there's no boost is because you don't need any in first usually. Now, if you had like a 2.73 rear end, you would definetely see boost in first. If you put my Stock N/A KA up against a 400 hp KA, I could probably keep up in first. After first is a different story. It's somewhat similiar as cruising on the freeway, you see 0 boost, in fact, your mostly in vacumn. Because there's no load, no reason for boost.

[Structure240sx]

umm i had no problem making boost tonight on the highway to jump from 60-100mph pretty quick

[andrave]

he said cruising on the highway, not jumping from 60-100...

[Structure240sx]

so what, im illiterate

[prigo]

You said it, not us

[Structure240sx]

haha

[SloS13]

Do you have your first gear switch wired up to your turbo solenoid? I would check that first.

I can make boost in any gear, and ive got a t3/t4. Something is wrong with your setup I bet. Dunno what though. Is the turbo definitly good? DO NOT, I repeat DO NOT use JDM turbo fluid in your T3. It wont work over here.

[nismo1003]

no, i dont' even have a turbo solenoid installed, so that woudn't be a problem.

I think so too, becuase my friend Sr hit boost at any gear. I think my turbo need to be rebuild. no I don't have any JDM turbo fluid.

[nismo1003]

thank you for all the reply.

[SloS13]

I was jokin about the turbo solenoid. I would imagine that your turbo isnt spinning freely enough. Twist the compressor wheel by hand and see how easy it turns, also wiggle the shaft. Oh yeah baby. wiggle that shaft. Knowing the rest of your setup might help too.

I seriously doubt it would be vaccum related. Vacum problems can cause too much boost. I dont know about them causing 'not enough' boost

[S14tat]

well i can make a full 9 psi on 1st gear with a straight T04B. that is if i can get traction in first gear. if i can hook up then i'll run 9 psi no problem.

[Structure240sx]

i have the same turbo most likely, nsports t04b-r. like i said i think i dont make boost because of the 11lb flywheel and DS not making enough load. so i dont have to worry about traction as much

[cdigity]

i dont really make much boost in first gear either.if i hammer the throttle, then it'll boost in firstbut then there is zero traction.i actually like the fact i dont get full boost i 1stby the time i shift to 2nd, its instantaneousboost throughout the whole gear, pulls much harderwith minimal slip.

oh yeah, im running a k-27 w/ external wastegate.

[huguetpj]

i dont really make much boost in first gear either.if i hammer the throttle, then it'll boost in firstbut then there is zero traction.i actually like the fact i dont get full boost i 1stby the time i shift to 2nd, its instantaneousboost throughout the whole gear, pulls much harderwith minimal slip.

cdigity could have a point there. nismo, are u flooring the throttle in 1st gear? I have a T3/TO4E and hit 4.8PSI at around 3.5k in every gear (and I have boost leaks)