Boost issues, in need of msp guru's

[_maklin]

OK, so i little while ago i was having fuel cut (felt like someone was jamming on my breaks when I was at WOT) So i figured it was the WGA. So i bought a new one (Forge adjustible WGA). So now I'm not getting the violent jerking i was before.....I drive it at WOT and i hear the turbo building boost but then it just drops off and disappears around 5k.

So what could it be? Could the actual wategate flap be jammed up? Could the new WGA be operating poorly? Cause it was a b**** to put in, I had to make it as short as possible to get it to fit. I don't really know what to do, Could it just simply be a vacume leak?

My mods are Magnaflow catback, upgraded SMIC, Injen CAI and the Forge WGA.

Any insight would be greatly appreciated!!!!

 

[_maklin]

oh! one more thing. When using this Forge WGA, do you still use the original vacume source? Or do yo tap into something else?

 

[Knox Joe]

Do you have a boost gauge? If so what PSI?

Vac leak wouldn't spool up the turbo to 5k then cut out all of a sudden. Since you changed the BPV and started having the problem that would be where I started.

Does the car blow off when the turbo quits spoolin?

 

[Dpwhitehead1]

i run a vac manifold.. i have independent sources going to the WGA,the BPV, BOV, Boost gauge.

 

[orng1]

It doesn't sound like he has a boost gauge, they are very important on this car. If there are any cracks or leaks from that vac/boost line to the actuator it will not control boost very well. Also boost leaks suck on this car, the turbo will easily max out the MAF and you will get very little boost. Typically there is a crack in the nipple for the BPV. Look around you may find that you have a very minor crack or loose pipe.

 

[Knox Joe]

the turbo will easily max out the MAF

This is what I was thinking, fuel cut, MAF overload whatever. Maybe the actuator is allowing a lot of boost.

How fast is your car OP? I mean does it feel significantly faster than before you changed the wastegate? Like you're possibly running about 14 psi/ basically fully open turbo?

 

[_maklin]

This is what I was thinking, fuel cut, MAF overload whatever. Maybe the actuator is allowing a lot of boost.

How fast is your car OP? I mean does it feel significantly faster than before you changed the wastegate? Like you're possibly running about 14 psi/ basically fully open turbo?

It feels like I have lost a significant amount of power since i put in the WGA. When I stomp on it I hear the turbo begin to spool, but then it dies off very quickly. And the BPV doesn't go off when I let off the throttle.

 

[_maklin]

Do you have a boost gauge? If so what PSI?

Vac leak wouldn't spool up the turbo to 5k then cut out all of a sudden. Since you changed the BPV and started having the problem that would be where I started.

Does the car blow off when the turbo quits spoolin?

Nope, no Boost Guage. But one is one the way. And I changed the WGA, not the BPV.

 

[Knox Joe]

Nope, no Boost Guage. But one is one the way. And I changed the WGA, not the BPV.

Sorry, that's what I meant, wastegate.

Hmmm, then it sounds like possbily the wastegate isn't closing. I'd recheck all the vac lines, maybe run a dedicated line to the WGA.

Shortening the shaft may have had an impact as well...

 

[_maklin]

It doesn't sound like he has a boost gauge, they are very important on this car. If there are any cracks or leaks from that vac/boost line to the actuator it will not control boost very well. Also boost leaks suck on this car, the turbo will easily max out the MAF and you will get very little boost. Typically there is a crack in the nipple for the BPV. Look around you may find that you have a very minor crack or loose pipe.

Just finished checking vac line and nipples, there all solid. IC pipes are good. Starting to wonder if the actual wastegate flap is all jammed up. Anyone ever have tht happen?

 

[orng1]

I had mine stick open and get no boost, well close to no boost. My car was slower than a civic. Base model... I could make 1-2psi if I REALLY tried to. Maybe the rod on the WGA was not set up properly and causing it to stay open. That can happen to those adjustable ones. Try lengthening it and see what it does.

 

[_maklin]

Alright, i'll try lengthening the rod next week. I would do it this week, but i'm tooo busy with work these days. I'll get back to you guys on how it went. Thanks for all the help again!

 

[Wagonbacker9]

if you shortened the WGA all the way to get it on, sounds like your wastegate is stuck, soon as the car builds boost (which is taking a while since you have the WG open to being with) you're WGA is pulling it even further open...

that'd be my bet. try testing your stock wga (blow into the vac port, if no air goes through, put it back on (for now)... taking out the forge aftermarket part might make diagnosis easier.

 

[_maklin]

If I blow compressed air into the vac port...should it be able to go through or not go through. Because i just blew air through the original WGA and it pushed the rod out. lol does this mean nothing is wrong with it? Have i just wasted a whole bunch of time chasing the original problem in the wrong place!!!???

 

[orng1]

Your not supposed to be able to blow enough to move the actuator, if you did then the actuator is bad. 6psi is a lot.

 

[Wagonbacker9]

If I blow compressed air into the vac port...should it be able to go through or not go through. Because i just blew air through the original WGA and it pushed the rod out. lol does this mean nothing is wrong with it? Have i just wasted a whole bunch of time chasing the original problem in the wrong place!!!???

Your not supposed to be able to blow enough to move the actuator, if you did then the actuator is bad. 6psi is a lot.

dead wrong. if he's blowing compressed air into it, it WILL move over 6 psi... as soon as the pressure of the compressed air overcomes the spring pressure on the other side. I would say its probably good (don't throw your tantrum just yet tho), but since you were blowing so much it might have been enough to overcome the leak (which would indicate the origional WGA failed).

try again, but this time use your mouth. tell us if you're able to blow through like a straw, or if its like blowing into a bottle.

 

[orng1]

LOL yeah compresed air I can get about 200psi out of a compresor if I try but out of your mouth is a different story. I think I'd black out trying to get the 6psi.

 

[Wagonbacker9]

LOL yeah compresed air I can get about 200psi out of a compresor if I try but out of your mouth is a different story. I think I'd black out trying to get the 6psi.

yeah, safe bet.

 

[_maklin]

Tried blowing through it...and it was like blowing into a bottle, although the actuator arm did move slightly.

 

[Wagonbacker9]

Tried blowing through it...and it was like blowing into a bottle, although the actuator arm did move slightly.

this means your WGA was fine.