93 vr fd-
stock twins are boosting @ 5psi and i have already checked all the vac lines and now i hate my fd.
what should i be checking.
My fd is running pretty much everything stock -minus
pfc- stock base map
greddy bov
intake and really thats it.

now i have this boost maxing out @ 5psi issue please help where should i start the trouble shooting???
btw it has good vac pressure.


thanks

 

I seem to recall a turbo troubleshooting section in the Factory Service Manual. I also recall seeing a trouble shooting section for boost issues on an individuals website but don't remember which. Try Google.

Or if you are like me, I am taking my FD to a rotary mechanic on Monday to see why my secondary boost fades as RPM increases. My boost pattern is 11-8-9 then gradually drops as RPM increases. I'm too stupid to find the problem let alone fix it.

 

wow!!! i think i just need to get over this initial pissed off mode and relax and re-examine. emotions are clouding my mechanical approach to this issue.

I hate my fd today!!!!

 

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

 

MIKE!! Relax dude, if you don't have it figured out by this weekend; I'll help you. At least your engine isn't cooked like mine...

 

mahjik----- there you are!!!! thanks dude


Archie------ man i feel like crap with my boost issue but, compared to your issue. Youre right I am relaxed or i need to be. It's just well **** man i dont need to explaine. I am all in " i FOOOkin hate my FD mode.

You players let me know what is the plan for your FD, And yes Archie I feel for your ****!!! believe me.... DUDE!!!!!!!

 

Yup. That is the one that I was thinking of. Lost all of my bookmarks recently.

 

hey dhays--- thanks man i am all over this issue right now!!!!! great info on this link and good luck with your issue. I need to turn this hate into love of my fd by this weekend..........

 

Mahjik------- the info on the link is Gold Rock solid. i have figured it out for the most part. went and changed most of the connection vac lines on the turbo Assembly and i am dealing with the primary turbo issue to see why i will not boost over/greater then 8psi..... wish me luck. Boost hunting this weekend..

 

Good luck. Post back if you have specific questions which aren't covered in the guide. There are a lot of experienced members around here who will definitely lend a hand.

 

thanks a million. will do. up until the boost issue i had great boost pattern 10-8-10 with a spike 11.5 around there. the secondary transition was exactly on the money 4500rpm. so i know that nothing major was faulting prior to this issue. How interesting is this, i can already see my weekend playing out.

Saturday is are monthly meet here in San Diego. I will also ask other members and see what i need to check that i have over looked. wow how fun!!!

 

Good luck and I'll see you tomorrow man.

 

redx7---right on thanks!!!



mahjik- the boost is back some what!!!! the primary is kicking 10psi but it seems that the secondary wants to but as soon as the transitions is made the boost fall off around 5psi. what the hell. below the 4500 w/ the primary-t seems like everything is 100% but now i have the secondary issue to look @. where/what am i supposed re-examin @ this point????

 

Well, the trouble shooting guide that Mahjik pointed out has a section on troubleshooting the secondary turbo. Now that your primary seems to be working well, that would be the next step. Make sure though that the primary checks out completely or you may be chasing your tail trying to find a problem in the secondary. I don't understand these things well, but I believe that since the secondary users the boost from the primary to spool up, you need to make the primary is 100% first.

Good luck. I'm taking my FD to the mechanic on Monday morning.

 

Well other people are going to chime in about vacuum hoses and solenoids. So I will leave that work up to them. What I will contribute is this:



I have highlighted the area of interest. Make sure that a C clip is still on there and that linkage is attached. Note it may look attached so wiggle it to make sure. You can acces it from under the car rather easily. Passenger side, right under the airpump, can't miss it.


If that linkage is not connected. You will only boost about 3-5 psi. I speak from experience.

 

montego----- thanks for the info. the part was checked and looked over last night when i checked all the linkage and changed out the vac lines.
now i have the primary working Super nice hell it feels like a new car, how ever when the transitions is made from prim to secondary the boost drops off big time. 3-5psi

i now will check over the pressure chamber and recheck the vac/pressure lines.


allllllllllllllllll of them!!!! back to leak/pressure hunting

 

bump!!!! help

 

It seems like you have a vacuum mis-routing issues. I've fixed this on my car and a friends car in the post. Every time, all I did was rework the vacuum lines. There were usually several just in the wrong spot. I would pull the UIM and check your lines. Also make sure you have the check valves going in the right directions.