Jump to content
SAU Community

Recommended Posts

hey i have a BCU+ boost controler on my r33

it holds boost fine at 7psi (low) and even at 11psi (high)

if i jump on the power in low revs it spools and holds 11psi fine but when i do a quick change or punch in above 4000 it spikes like crap to about 14-15psi

is this a tuneing issue or is it just shit?

the only reasion i have it was i got it really cheap

please help!

Link to comment
https://www.sau.com.au/forums/topic/220843-bcu-boost-controler-spikeing/
Share on other sites

hey i have a BCU+ boost controler on my r33

it holds boost fine at 7psi (low) and even at 11psi (high)

if i jump on the power in low revs it spools and holds 11psi fine but when i do a quick change or punch in above 4000 it spikes like crap to about 14-15psi

is this a tuneing issue or is it just shit?

the only reasion i have it was i got it really cheap

please help!

Have you played with the gain, or are the settings out of the box (or auto) - list the the type of BCU and EBC you have. Did it only start doing this after your BCU and EBC? :)

Edited by GeeTR

yer i have played with the gain and start boost but haven’t found a good combo

i had a turbosmart boost T before was spiking too!

the car has front mount intercooler

3" dump hiflow cat with 3.5" cat back

iridium plugs and splitfire coilpacks

i want to run about 12-13psi standard turbo but need to stop the spiking

anyone tuned one of these before

any suggestions?

the BCU+ boost controller can be seen here-

http://www.sportcompactonly.com/Boost-Cont...115_p-79669.htm

LoL, i was quoting "BCU" to take the piss, butt they actually call it a "BCU" :):D

Checking the specs, id say its just a EBC :)

A spike is were boost overshoots target boost for a moment, then settles again, usually due to aggressive gain.

Does yours temporally hit 14, or does it stay rock solid at 14??

Its your gain mate.. What is it set on?

Its difficult to set up originally but put down about 6gain and then dial in 25 on the controller this should net you about 10psi

Dial up the boost to where you want it and then turn up the gain and floor it, take note when it starts to spike and turn the gain down.. then your set..

Make sure you've regapped your plugs to 0.8 too cheers

ok reading this makes me almost certain there's something wrong with my ebc ... it's set to 10psi but the lcd display shows number ranging from -99 up to low positives (it should go to 100 as that's 10psi on this ebc) , going up and down quickly (NEVER settles even for a second)

Weird thing is when they installed it at the shop and put the car on the dyno ..according to their graphs it was holding 10psi. Ah wtf. this is getting ridiculus ...the more money I spend the more problems creep up that I have no friggin idea how to fix.

cheers guys i had a play with it for about an hour tonight and seems much better but still spiking

i got the start boost set on 10psi and the gain set at 60

its going straight to 11-12psi and holding great

but when i take it to 7000 and kick it into 2nd and jump back on the power it still spiking to 13.5-14psi

i got my warning set at 14psi and it hasn’t been going off

will play with the gain abit more tomorrow night to try to get it sweet

but if you have any advice on tuning it please tell!

ps. iridium plugs at 1.1mm seem fine as long as you have splitfire coils

  • 1 month later...

Hi, I know this thread if old but if your still having problems.

The BCU+ unit's start boost function works like this.

Lets say you set boost at 14psi, and start boost at 10psi, what it means is the wastegate will start to open 4 psi.

If boost is 10 and start is 10, it will open straight away.

Its quite a tough unit to tune, have been using it more than a year and the soilenoid stopped working on me today. Took it apart, gave it a nice clean and now its working beautifully again.

I find setting the gain from low then slowly increasing it till it holds boost till redline better, although many people go from up to down. And its sensitive as well, 1-2% gain makes alot of difference. Good luck.

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

    • It is a kunfine Android screen . Does anyone know the wirering diagram of the fuga ??
    • just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Awesome, thanks for sharing!
    • To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
×
×
  • Create New...