turbo question

[mpettograsso]

just bought typhoon number 866 last week...runs strong, all stock except manual boost valve.......factory boost guage shows 15psi, launches hard...but i noticed one thing wierd.

When i am cruising, and put the pedal down to the floor...it kicks down into gear, pulls, but I hear a lot of air under the hood. I've been in turbo'd cars before, and the boost slowly raises with the engine rpm, but mine stays at 15...seems like a wastegate problem or something like the turbo is not forcing all the air into the motor?.....all hoses are good, new vacuum lines etc. please advise if possible.


:myclone:

 

[kessler]

Re: turbo question

check the Clamp between the Intercooler and TB they have a tendency to pop off.

 

[dgoodhue]

Re: turbo question

If the clamp was loose it wouldn't reach any more than 1 psi of boost. Don't trust the factory boost guage. On my Sy it looked like it hitting 17-18 psi, at 15psi. My Ty was hitting 12 psi but guage said 15 psi.

Could you Ty have an external wastegate or leaking blow off valve?

 

[DynaGlide]

Re: turbo question

Your boost will only rise until you hit maximum boost, then the wastegate will open and vent the excess exhaust pressure. If you have an external wastegate, it might be vented to atmosphere, which would be loud at full boost without a wastegate muffler.

 

[mpettograsso]

Re: turbo question

checked all hoses/ clamps...all tight.......but what i did do on recommendation from one of my employees that owns a 12 sec srt4 neon, was to pull the ecm fuses to "reset" the computer?.....truck runs way better and you can actually hear the turbo spool. i think it fixed it.


thanks

 

[Flyin Ryan]

Re: turbo question

checked all hoses/ clamps...all tight.......but what i did do on recommendation from one of my employees that owns a 12 sec srt4 neon, was to pull the ecm fuses to "reset" the computer?.....truck runs way better and you can actually hear the turbo spool. i think it fixed it.


thanks

why would resetting your ecm correct a loud wind noise from under the hood??

 

[cheezy69TnT]

Re: turbo question

good point sounds like something i had, then i reset the computer and same noise, resetting the computer will only let you boost up to what your actuator tells the computer it can, maybe your actuator is bad or wastegate isnt opening but the vac lines are usually the prob, check your evac, which can cause changes of sound, did on mine.

 

[LIL QIK]

Re: turbo question

I had this exact same thing happen on my Ty. Ended up being the vac plug on my throttle body (the big one on the top) had a rip in it that I couldn't see. Popped the hood and had my bro do a boost brake and boy could you see the pressure just open it up....lol. Easy fix....drove me crazy for a while. I was even reaching 15psi while it was happening.

 

[Aeroking]

Re: turbo question

however you fix it, an aftermarket boost gauge should be #1 on your mod list.

 

[Luke]

Re: turbo question

whatever you do, dont let your neon owning employee work on your new TY. good luck with the fix

 

[mpettograsso]

Re: turbo question

I already spanked the neon, so I think he's concentrating on his own car....rechallenged me at the track when it opens up in the summer.

anyway...very helpful info from everyone...thanks so much.going to work on it this weekend