Strange setup on used MSP?

[jlindbo]

So I just bought a MSP from a Mazda dealer on Friday. It had the mods bellow installed but the dealer claimed it was still covered under its original warranty.

HiBoost FMIC with HKS BOV
AEM Intake
AutoMeter Dual guage pod

After driving the car for a while I noticed the gauge was claiming it was running much higher than factory boost (10PSI) and it seems that I am experiencing fuel cut. I am not able to locate a boost controller anywhere (manual or otherwise) which makes me wonder how the PO got the car to boost above factory (wastegate mod?). When looking at the setup I noticed he was venting the BOV to atmosphere and had an out of place hose run (pictures attached). Any ideas what the purpose of this is? It looks like the nipple on to the charge pipe was welded on after the fact. Forgive me if I am asking an obvious question, I have not been able to locate a setup like this with the forum search.

 

[Spooled]

Woah, WTF? It looks that red hose it running straight from the charge pipe to the intake. You shouldn't be boosting at all. There isn't a valve to keep the boost from leaking right into the intake.

I can't tell from the photos how youare boosting, but you can trace the line from the wastegate actualtor back until you find something that looks like it might be restricting the flow.

I would pull that red hose off and see what the deal is (does it run straight through?). You really need a bypass valve on there. If you get a chance, take some more photos of the engine bay.

 

[Spooled]

Also, where do you live? More than likely there is a member that lives near you that can probably sort it out pretty quickly.

 

[Nightmare]

looks like a recirculating hose to me..

 

[Spooled]

looks like a recirculating hose to me..

Yeah, it is, but there is just a plastic elbow where a BPV should be. Under boost it would just recirc air back into the intake rather than build pressure.

 

[peepsalot]

Yeah, that red hose is just wrong. That's a massive boost leak.

That's an HKS BOV?

 

[ChopstickHero]

Yeah, that red hose is just wrong. That's a massive boost leak.

That's an HKS BOV?

true.. it's a boost leak... leaking back into the intake tract.. hehe...

hmmm... are you experiencing any other driving issues (stalling, stumbling, hesitation) other than fuel cut? if you are having any of those problems, you can try recirculating that BOV back to the intake nipple. then find a cap to put on the nipple on the intercooler pipe. that nipple on the intercooler pipe was put there to allow for dual setup (a bpv and bov).

 

[Fede_italiano]

true.. it's a boost leak... leaking back into the intake tract.. hehe...

hmmm... are you experiencing any other driving issues (stalling, stumbling, hesitation) other than fuel cut? if you are having any of those problems, you can try recirculating that BOV back to the intake nipple. then find a cap to put on the nipple on the intercooler pipe. that nipple on the intercooler pipe was put there to allow for dual setup (a bpv and bov).

You should put a cap in the charge pipe side and connect th hose from the intake to the BOV so that you can recirculate.

Is that BOV old? It almoust looks like a BPV.

 

[jlindbo]

That's an HKS BOV?

Yeah, its an old school HKS that you could get with the HiBoost kit.

I live in Wisconsin and bought the car from Morries Mazda in Chippewa Falls. I wonder what the service manager is going to say about all this when I bring the car in today since his sales people were claiming the car had been inspected and had the remainder of the mfc warranty ;P

Thanks for the quick replies.

 

[kamikaze7]

true.. it's a boost leak... leaking back into the intake tract.. hehe...

hmmm... are you experiencing any other driving issues (stalling, stumbling, hesitation) other than fuel cut? if you are having any of those problems, you can try recirculating that BOV back to the intake nipple. then find a cap to put on the nipple on the intercooler pipe. that nipple on the intercooler pipe was put there to allow for dual setup (a bpv and bov).

If you have no drivability issues then leave it.

True it is a boost leak but it that might not be a problem, not effecient but not a problem. First thing is to follow the vacum line back from the wastegate and see where it is connected. I suspect it is open.

Here's what I'm thinking. If the vacum line to the waste gate is open you will always be operating at full boost. Let's say that the turbo can produce 15psi of boost. Based on the path of least resistance most the pressurized air will flow into the engine thus providing 10psi on your boost guage. The other 5psi will recirculate between the intake pipe and the charge pipe. The turbo will be sucking most of its volume from your intake and part of the volume from the pressurized air leaving the turbo.

 

[jeffmsp]

why would you want that? put the stock bpv back in and have a dual setup. the turbo doesnt like spooling more than it has too, i think you could even do damage over time.

 

[jlindbo]

why would you want that? put the stock bpv back in and have a dual setup. the turbo doesnt like spooling more than it has too, i think you could even do damage over time.

I would but I do not have the stock bpv, I had just purchased the car used.

 

[Buckshot B]

find out what production# your MSP is. SEARCH FORUM

 

[byohndspeed]

i think who ever had it last removed a few parts before getting rid of it. the line going to the bov is the maile line from the mani. you can tell by the sleeve that is on it. it also looks like a small vac line coming of the charge pipe goiong somewhere.

 

[lcruz64]

I have a stock bpv if you want to by it.
But what I would do is relocate the maf between the bov and the throttle body and seal the holes that the tubes are attached to.

 

[jlindbo]

find out what production# your MSP is. SEARCH FORUM

I allready have, production number (1633) is in profile.

 

[Brian MP5T]

That s*** needs to be looked at by a compitent person...

 

[Buckshot B]

agreed.

 

[NoRotorNoMotor]

welcome fellow wisconsin person, i have no idea about turbos so i cant help you with s***

 

[jlindbo]

That s*** needs to be looked at by a compitent person...

Yeah, my feelings extactly. The dealer has agreed to honor the remainder of the mfc warranty if I let them return the thing to stock boost. I am guessing they will cap the inlet on the charge pipe and run the bov to the intake. Of course I will not be able to take it to any other Mazda dealer for work but ...