car won't boost past 16psi - wastegate issue?

[go240]

i have redtop with the following mods:
t3/t4 57trim .63 a/r comp, .48 a/r turbine
equal length topmount manifold
3" exhaust
tial 38mm wastegate
fmic
blitz bov
sard fpr
walbro 255lph
650cc injectors
hks 264 step 1 cams
cometic hg
arp studs
apexi power fc
greddy profecBII

the car was being tuned today but it wouldn't go over 16psi. i have a 14 psi spring in the tial. the way i ran the lines for the wg is like this:
line from compressor to boost controller solenoid. line from the solenoid to the top nipple on the wg. line from the side of the wg to the compressor (on a seperate fitting than the line to the solenoid). is this wrong?
or is there another reason they can't get it to boost more than 16psi. i guess it made 270 something at 16psi (mustang dyno)

any help is appreciated

[SpeedMonkeyInc]

Sounds right, so maybe you have you boost control solenoid in and out mixed up. Controller have its pressure source and the line is not crimped? Wastegate fittings secure?

[go240]

yea, the controller is hooked up on one of the fittings over by the throttle body. i'm not sure about pinched lines - there's a possiblity, but i can't verify it until i pick up the car. something just doesn't seem right - it should hold boost well over 16psi with a 14 pound spring. the .48 a/r turbine is a little small, but i calculated that it should be good to the mid 20 psi's

[go240]

what would happen if the 3rd hole (the one that's not going to the wg or compressor) on the solenoid was plugged or partially plugged? i can't remember if that little plastic cap is still in that hole or not. i would check but i don't have the car back in my posession yet

[SpeedMonkeyInc]

Trouble shooting without a car stucks. That plastic plug should be out I think. I wonder if that bleeds off boost?

[go240]

i got the car back today, but i didn't have time to go over it. it's very fast at 272whp, 269wtq (mustang dyno) but it definately should be able to hold more boost. some people are saying that i should have the boost controller going to the fitting on the side of the wg and the top one shouldn't be connected. i may take it to a different dyno in the coming weekends to see if they have any better luck or can spot a problem in how my wg is set-up

[go240]

http://img.photobucket.com/albums/v483/mnaccord/cars/240%20build%20up/scan00201.jpg

wg opens up at like 5000rpm's and keeps the boost to 16psi until redline. hrmm

[driftfactory]

If the wastegate turns out to be ok you may also want to look at the BOV. If the spring is too weak it may be losing pressure though there. A freind of mine had that problem and it took him forever to figure out because his BOV was still blowing off like normal. I would still look at the wastegate first though.

[SpeedMonkeyInc]

Here is how mine hooks up: NC to side port on the wastegate and t-eed off with the compressor pressure port ( Greddy manual says its ok ). COM port to the top port on the wastegate. NO port open to atmosphere. As far as I can tell, my Profec is working perfectly.

[go240]

Here is how mine hooks up: NC to side port on the wastegate and t-eed off with the compressor pressure port ( Greddy manual says its ok ). COM port to the top port on the wastegate. NO port open to atmosphere. As far as I can tell, my Profec is working perfectly.
ok so that's essentially exactly how mine is set-up.



as far as the bov - mine was leaking so bad the car missfired so i got a new one. (blitz) i also have the hard spring that i can install if that's the problem. i'm thinking of taking it to a different shop to get their opinion