boost problem PLEASE HELP ME!

[thomas_mk6]

hey guys i have had this problem since about a week after i bought the car, so i fitted a boost gauge to see what was happening

right symptoms!:
i have what sounds like a blowing comming from the exhaust, either from the downpipe or one of the turbo gaskets
the boost gauge is showing 10 psi on the first turbo then it dropps to about 8.5, then at the change over the second turbo hits just under 10 psi then drops off again to between 8 and 7

i think the car is running quite rich as it does pop every now and then

the only mods i have is breather filters on the air pump lines and some cone filters on the inlet

i have checked the rats nest and cant see any split or popped off hoses

also the boost gauge doesn\'t show a steady reading it does wobble very slightly (is this normal?)

things i am going to check next is try a different boost gauge incase this is faulty and then check all the one way valves



the question i am asking is basically do these symptoms point to any 1 hose or solanoid to look at first or do i just havto check every last one?

thanks for reading lol

[Jono FD3]

unfortunatly it doesn\'t point to one thing the sequential system is a mind bender at the best of times, but when working it is awsome! although.... you cold check the prespool solonoid pipes & actuator!

Jono

[neil_jdmr]

Worth changing all the check valves for viton ones to start.
 
I had a very similar problem which took months to sort and was eventually sorted by pip. my second was creeping to 13psi then the stock ecu was retarding ign and dropping boost to 6psi.

[thomas_mk6]

where can i get these viton check valves from because ive been looking for some for ages?

[thomas_mk6]

any1 else got any ideas?

[Jono FD3]

viton check valves from ebay.com (USA) is the best place to get them
But the set I bought, I found they stuck shut & caused other problems
Jono

[marcusd666]

where can i get these viton check valves from because ive been looking for some for ages?

I got mine off this guy from the USA just send him an email and he should be able to sort you out. I think a set cost about $20 posted.

His Details
Dale Clark
rx7guru@clubrx.org

[neil_jdmr]

Believe he is called Dave Clarke or Dale Clarke but have a search on the US ebay

[Looney]

I\'d start with the blowing exhaust first. Find out where its blowing from and sort that out first, otherwise you could be peeing into wind with trying other things.

[trotter]

hey guys i have had this problem since about a week after i bought the car, so i fitted a boost gauge to see what was happening

right symptoms!:
i have what sounds like a blowing comming from the exhaust, either from the downpipe or one of the turbo gaskets
the boost gauge is showing 10 psi on the first turbo then it dropps to about 8.5, then at the change over the second turbo hits just under 10 psi then drops off again to between 8 and 7
i think the car is running quite rich as it does pop every now and then

the only mods i have is breather filters on the air pump lines and some cone filters on the inlet

i have checked the rats nest and cant see any split or popped off hoses

also the boost gauge doesn\'t show a steady reading it does wobble very slightly (is this normal?)

things i am going to check next is try a different boost gauge incase this is faulty and then check all the one way valves



the question i am asking is basically do these symptoms point to any 1 hose or solanoid to look at first or do i just havto check every last one?

thanks for reading lol

this is the standard boost pattern. 10psig on first turbo, 8-ish at change over, then 10psig when both on song.

If your problem is after changeover that kinda suggests to me a problem with the pipes around the secondary turbo. Although the pressure is the same as with primary alone, any piping on the second turbo lines may have a leak or a hole leading to loss of boost after 10psig.

If that makes sense!!

[neil_jdmr]

Also double check all the silicone couplers especially the one on the top of the y pipe for tiny cracks or even if it looks like its got hard/brittle.
 
As trotter said above it does sound like a leak on your second turbo piping

[thomas_mk6]

i have changed the coupler off the y pipe a while ago because it kept blowing off

quick question tho have any of you had the plastic intercooler pipe comming from the y pipe slpit and leak? because the bracket on mine where it bolts to the block has snapped off, so it could be leaking from there maybe?

[Looney]

the plastic bracket is clipped/glued to the plastic pipe. It shouldn\'t cause a leak there unless its cracked the pipe.
 
Only takes two min to take off and inspect, inside out.
 
You still getting the blowing exhaust sound? Pin pointed where its coming from yet?

[neil_jdmr]

I was getting a very similar problem the other night after i had been working on the car. My boost is set to 0.85 bar but it felt a bit flat and when i checked i was only seeing 0.68bar. I hadnt tightened the intercooler hoses well enough. Be aware they looked solid and didnt really move much but after a turn or two on the jubilee\'s and checking the were all sitting right i instantly retrieved 0.85 bar.
 
Just double check all the hose connections first,
 
Maybe try blanking off your bov to prove thats not leaking, it wont do any harm

[thomas_mk6]

i checked the black plastic hose at work yesterday and couldnt see any cracks but i made up another hose at work and pressure tested it to 35 psi and it was fine, put it on the car and still the same problem, so that is eliminated, havnt found the blowing on the exhaust yet as im sure you can understand it gets a bit tight by the downpipe but the turbos are cumming off next week so i can change all the gaskets. i will try blanking off the blow off though

any1 got any tips for removing the turbos with the engine still in?
i havto get the front crossmember off anyway to fis the leak from the sump, and dont really want to get the engine out if i can help it:Hammer