LagoFD3

This just started when I took out the air box and put cold air filters on. The car before with the original intake box boosted 12PSi with the PFC @ .85kg. Now the car is boosting 7PSi with the PFC reading .52kg . I looked at all the Vac lines and they look fine to me. I can't figure it out. The car still feels like a beast but not Boosting like be4. Anyone help me out on this. I miss my FD and I don't want to drive it like this.

Thanx.

LagoFD3

Forgot to mention that the Turbos were made non-seq.

Mods are the Filters,3'' Downpipe,PFC.

LagoFD3

Anyone have any suggestions on what could cause the low boost now even if the PFC is set @ .90?

really would appreciate the help.


Thanx.

gracer7-rx7

iTrader: (16)

Start here:
http://www.autosportracetech.com/RX-...erOverview.htm

there are a few other links in the stickied FAQ thread.

RLaoFD

iTrader: (6)

Something in your turbo control system is malfunctioning.

http://www.autosportracetech.com/RX-7/rx7stuff.htm

RLaoFD

iTrader: (6)

^^^ same minute... DAMN! HAHA

gafu mazda

Juan,check for any leaks on IC hoses,or any lose vac hoses that may have come off while taking the box out.Do you have a BOV installed?HKS or stock?Start there,and thanks for calling.

LagoFD3

Gafu!...What up?...I have checked them but I will look at them more thoroughly! I had an old BOV that is from Turbo XS that came off of the Turbo II that I have. It did it before that too. Could it be that since there is more air flow now that hoses are pinching? I will take a look at that tomorrow and then let u guys know!

mad_7tist

the only way the intake tubes would collapse now is if the filters are restricted and causing a pressure drop in the intake tube. as said before you prob have a turbo system problem. what is the pattern like? full NS or poormans?

LagoFD3

The car boosts to 7psi/.52kg normally but then holds right there, doesnt go past there. Cruisin I step on it and it boost right up like normal but holds there. Every gear goes up to 7psi/.52kg. The PFC is set for higher. Are the turbos bad?
I'm new to this 3rd gen talk so what is "NS or ppormans"?

RLaoFD

iTrader: (6)

NS is non-sequential.

there is also poor man's non-sequential. do a search to find more info on it.

Mahjik

iTrader: (1)

Did this happen after you made the turbos non-seq? If so, did you replace the vacuum lines from the wastegate actuator to its associated solenoid?

gafu mazda

Mahjik,hes actually been running non-seq for a while now,all he did was remove the air box.

Mahjik

iTrader: (1)

That particular line/actuator is right in that area. It's something that I would check as running off the wastegate spring only will only yield about 7 PSI.

LagoFD3

Yea...I have been running Non-Seq for a few months already. As soon as took off the air box and put filters on it started only boosting 7psi.

So I should check the actuator and see if it's good?

LagoFD3

Maybe I should of asked this before...but how do u check the actuator ?

LagoFD3

I didn't do the NS system. A friend who rebuilt the motor was the one who did the system that way. I know he welded somethings on the turbo's and that this would give me more power. Sucks but thas all I know about the NS system setup.

jmadams74

Did you read the suggested posts (and many many other posts if you search) to get a basic understanding of how the turbos work and what they and their control systems are supposed to be doing. It's hard to trouble shoot if you don't know what to look for. I'm pretty sure Mahjik is pointing you in the right direction. . .you've done something to disable the wastegate (could be vacuum/pressur line or electric, most likely vacuum pressure connection on the wastegate actuator) such that the wastegate is simply operating on the defaut spring pressure which gives you about 7psi. Shouldn't be too difficult to sort out once you know what you are looking for. . .
--Jeff

LagoFD3

Another note: While I was driving the car today cuz I have no other car for the time being. I noticed that my Air Temp on the PFC read -1C and as low as -4C. That seems odd to me. Has this ever happened to anyone else? I have been searching for any other lines but I can't find any leaks. I am still searching on this but that PFC reading was weird. Help on this Please!

Oh and that link that u guys gave me is awesome. i am using that as I search for my problem.