Boost Control Problems Stock Boost!

[toffy]

hi everyone, i just fitted a fmic to my r33 and im having alot of trouble with boost spike over 5000rpm. An exact description, ok i put my foot down in any gear and the needle (i know this is a bad way to read your boost level) goes straight to the middle bar between 0 and 7mmhg or whatever () then at about 4800rpm it suddenly spikes to JUST under the 7, as soon as it does it i jump straight off the throttle as im not keen on blowing stuff up, ive fiddled and farted around with vacuum lines hoping it may just be a simple thing but havent had any luck. Right now its running straight off the actuator to the line in that usually goes to the bov and ive blocked off the carbon cannister and used that line for the bov. has anyone had trouble like this?HEEELP

p.s engine mods are:

3in turbo back exh with high flow cat

hard pipe intake thingy

walbro fp and new coilpacks (and fmic now). i am about to fit an avcr and safc but i want to sort this problem out first

[nikr33turb]

Im reasonably new to this stuff myself but if i were u id get a decent boost gauge so u can see it accurately. Are you running stock boost ? or clocked it up?

[R33 S2]

i had the same problem. i ended up putting a nipple on my cooler pipe

[nikr33turb]

i had the same problem. i ended up putting a nipple on my cooler pipe

hey ive heard of this being done...what is it? y is it done? and is it worth it? cheers.

[R33 S2]

have a read of this thread

http://www.skylinesaustralia.com/forums/in...2&hl=nipple

[R33silverS2]

yeh weld a nipple onto the cooler pipe, or you can get threaded ones to screw in. I had the same problem when I installed mine a yr ago. It should be sweet once you get the nipple put onto the cooler pipe. Put it in same location as stock one and run to the actuator. Perhaps till you do this, unpug the stock boost solenoid and it may not go as high.

[toffy]

cheers guys, i didnt think to search for nipple

[WogsRus]

HI toffy, come and see my setup, same issue, i drilled and tapped the cast pipe to the TP ilet and plumed it off that, go an see scott at the purple pig and ask for a nipple connection, he has a few, i have some actually come to think of it.

[charlie25T]

hi everyone, i just fitted a fmic to my r33 and im having alot of trouble with boost spike over 5000rpm. An exact description, ok i put my foot down in any gear and the needle (i know this is a bad way to read your boost level) goes straight to the middle bar between 0 and 7mmhg or whatever ( ) then at about 4800rpm it suddenly spikes to JUST under the 7, as soon as it does it i jump straight off the throttle as im not keen on blowing stuff up, ive fiddled and farted around with vacuum lines hoping it may just be a simple thing but havent had any luck. Right now its running straight off the actuator to the line in that usually goes to the bov and ive blocked off the carbon cannister and used that line for the bov. has anyone had trouble like this?HEEELP

p.s engine mods are:

3in turbo back exh with high flow cat

hard pipe intake thingy

walbro fp and new coilpacks (and fmic now). i am about to fit an avcr and safc but i want to sort this problem out first

hey mate

firstly what kind of boost controler you using

two save your money and dont get a safc and get a pfc..............

the pfc will fix that prob easier