Jump to content
SAU Community

Recommended Posts

Noob question but thought I'd double check..I got my greddy profec b spec 2 controller installed and tuned to 12 low and 14 psi high I removed it and am thinking of getting it installed in my Gtr, can it be put straight in with out needing it retuned

Link to comment
https://www.sau.com.au/forums/topic/388820-boost-controller-question/
Share on other sites

  • 2 weeks later...

OP, what car did it come out of?

It all depends on actuator pressure as the boost controller is a % increase.. i.e. 50% on an RB25 actuator is not the same as 50% on an RB20 actuator

And as said above, I would reset the gain and setgain and tweak them from scratch to suit the setup in the new car.

Start from scratch. Its a pain in the arse to get right too. You need alot of road, alot of patience and alot of trial and error. Its a % over the current actuator setup and as said above, different tensions on different actuators will mean different things when you open your boost controller to 50%. Ive got mine on 0% low boost(14psi) and I think about 40 or 50% high boost for 20psi. Then you got gain, to make sure your boost is nice and consistent. You've also got your warning crap. Set this shit up wrong and you will be ON AND OFF BOOST, you can feel it and hear it loosing then building boost then hitting the limiter, losing boost and then building it up again.

You have set, which is your boost, then you have gain(set gain?) which controls boost falloff. Then you have start boost which is your desired boost -1psi, your warning which is your boost limit, +1psi of target boost(maybe even 2 - 3psi) then you have warning which is how much boost you would like to drop usually about 5 - 10% lower than your set. I had my boost controller, profec b spec 2, setup by CRD and they suggested the warning should be set to 0% all the time. It was perfect on my car. Anything more gave me the symptom I described above(on off)

Best to do it on a dyno where you can graph boost vs rpm so you can safely play with it without crashing your car into a tree or popping your motor because you weren't paying attention to both at once.

Also means you can get the boost curve nice and flat.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Greg speaks wisdom. These dirty old Datsuns are only value when they are cheap. When they are not cheap, there is no value. Sounds contradictory, but it's true. We are now 20 years past the hey day of modifying cheap 90s JDM cars for small amounts of money. This is a different world. If you are rich and can afford not to care about what is effectively wasting money on an old Datto shitter, then I have no reason to argue against it. But if you are wanting to experience what we all experienced back in 2005 (and I bought my car last century!) then there is no way to do it.
    • Short answer: No. Medium answer: No, because you still need to conjure the things out of thin air to bolt them to a NA to make it a NA+T. Long Answer: No - The things you need to conjure - meaning a turbo, intercooling, manifolds, exhaust, intake/manifold/piping, clutch, injectors, fuel pump, AFM (?), ECU + Wiring (woo, N/A loom fun) have to come from somewhere. You could have many scavenged these things from an OEM car that someone had upgraded from and use some of these. This will be cost prohibitive now, especially so in the USA. You'd probably pay the same for newer, upgraded components that are better than old OEM stuff from 25-30 years ago. None of these big ticket items are re-usable for the N/A car. Why not buy new and upgrade while you're there? The only real consideration is turbo and fuel sizing and determining whether you want to stay within the bounds of the OEM engine or get into rebuild territory. These limits ARE lower with a N/A motor and especially N/A gearbox at the starting point. And if you're gonna upgrade those then you may as well consider having them built to begin with. Because everyone here knows you're never far from that next engine rebuild once you start making the power you want... The cars you see on the internet and SAU etc have been built over decades. If you're really clued in... you would sell your US car to somebody for what you paid for it. You would then scour AU JDM pages or SAU and buy a car like Dose's on this forum with your powerful American Dollar. This will save you so much money in the long term. Importing it could be tricky. Or it might not because USA. I have long said the only reason 90's Japanese stuff took off was because a) Japanese people had Japanese cars so that is what they used b) Australians could import these cars to Australia with very minimal changes and use them on the road here c) Neither country had well-priced access to US or EU Sports Cars. I don't believe the JDM scene would have taken off in Australia at all if we had EU priced EU BMW M offerings, or more especially the AUS V8 Scene would never have existed if we had the multitude of US cars like Camaros, Mustangs, Corvettes at the prices you folks do. After all - Do the math. I would say put a V8 in your R34 and that's the smart way forward. It is. I did it. I know this from my own experience. But at that point there's no reason to simply not buy a C5 or C6? It would be simpler and easier and cheaper and bette-
    • Reading all this... hurts lol. I have an ENR34 5MT and I paid an inflated USA price for the car alone, had to do tons of preventative maintenance past that, and so I'm over $30K USD into the car already and haven't even touched power.  I wanted to +t it. Not even trying to make GTR numbers, I'd be happy with 250hp.  Can I get away with paying much less to make that happen?
    • Damn you’ve done well, definitely snapping necks.
    • Great weekend and event. Open fire at the caravan park, perfect weather all day and a great feed and a couple of drinks at at awesome country pub.
×
×
  • Create New...