MSP Turkey: FACTS

[Striker187]

you should get a little fluttering at low boost. i forget the reason why...something like not pulling enough vacuum at low boost or some reason. but at high boost, psshhhtt!!! i say you have the problem solved 505

 

[hotshtsr20]

you guys are silly.

the reason you guys are getting comp surge is because of the teeny weeny size of your BOV and the pipe leading to it. basically, the pipe cant flow enough air to vent out all the boost in the pipes before it reflects back onto the compressor blades.

another reason is because of the teeny weeny pipe leading to the BOV, the thing is like 1/2" ID. this is not enough to vent the pipes either, even with an aftermarket BOV, you will still run into problems.

and, finally, many of you with aftermarket BOV's have probably not adjusted your spring setting. if you are recircing it, then you wont need it to be very stiff, follow the instructions found here http://www.sr20forum.com/showthread.php?t=39898 at the SR20 forums to adjust it properly.

to remedy this turky action, you guys will have to put an aftermarket BOV (or a 1G eclipse one) directly on the IC piping.

if this has already been posted, i am sorry for the repeat, i didnt feel like reading all 3 billion pages.

 

[505zoom]

you should get a little fluttering at low boost. i forget the reason why...something like not pulling enough vacuum at low boost or some reason. but at high boost, psshhhtt!!! i say you have the problem solved 505

Almost...

Hopefully with the stock BPV also in the setup, it won't surge at low boost. Only time will tell.

 

[Striker187]

kinda funny though cause the hks has two valves...a small one for a quick initial release or while under low boost conditions and a larger one to release the bulk of the pressure while under high boost. you think the hks could handle it.

hotsht - people have adjusted their aftermarket bovs from one extreme to the other with no results.

 

[Notorious]

Yeah but with our cars its not the valve anymore. It doesn't matter if the valve is 7 inches and the piping is 1/2 inch. Its gonna be limited by the piping.

 

[hotshtsr20]

Yeah but with our cars its not the valve anymore. It doesn't matter if the valve is 7 inches and the piping is 1/2 inch. Its gonna be limited by the piping.

exactly what i said in my post, or were you correcting the other guy?

and s***.

oh, and bigger isnt necesarily better, i have a GReddy Type R (2"outlet pipe!) and i needed to cut the spring to make it soft enough to open with anything less than 20 psi of boost.

but, putting the BOV right on the IC piping is a good excuse to rid your car of that slightly oversized oil cooler turned intercooler and get a decent sized one with hard pipes.

i will be, sometime in the future, making a setup for Notorious, so you guys can see. if you want to look at my current setup, go here....

http://www.imagestation.com/album/?id=4289769161&code=7234049&mode=invite

and here....

http://www.imagestation.com/album/?id=4290451659&code=7234078&mode=invite

its imagestation, so you need an account.

 

[Notorious]

but, putting the BOV right on the IC piping is a good excuse to rid your car of that slightly oversized oil cooler turned intercooler and get a decent sized one with hard pipes.

i will be, sometime in the future, making a setup for Notorious, so you guys can see. if you want to look at my current setup, go here....

Yea seriously, the ic in the msp sucks. Pulled right off the diesel model.

 

[Striker187]

505 is running hardpipes so he does have the hks flange on there, not the tiny stock tube. should be plenty to vent off a measly 6.5 psi of stock boost. but true, the little 3/4" tube feed to the stock bpv isn't helping any......

 

[jersey_emt]

Couldn't kill the turkey, killed spike instead

505 is running hardpipes so he does have the hks flange on there, not the tiny stock tube. should be plenty to vent off a measly 6.5 psi of stock boost. but true, the little 3/4" tube feed to the stock bpv isn't helping any......

I tried 505's trick on the stock IC pipes and BPV. I gave the wastegate a dedicated vacuum line. I tried giving the BPV a dedicated line. I tried them both first with the MBC @ 8.5 psi, then at stock boost. No luck, still had the turkey. The only good thing out of the day was when the wastegate has it's own vacuum line, my MBC didn't spike as much. So not all was lost.

 

[Striker187]

what'd you use as your source for the wastegate and bpv? and you're still using the stock bpv right? did you vent the stock bpv to atmosphere and cap the injen return tube? cause that return tube is awful small and is probably contributing to the problem....same with the inlet tube to the bpv. maybe you'll get a reduction in turkiness at least

 

[Got_boost02]

not to thread jack, but in the sr20 forums on the adjustment writeup, he stated that you should removed one of the springs inside of the BOV and cut the remaining one?? whats the purpose for this??

 

[SoniCraze]

Re: Couldn't kill the turkey, killed spike instead

FINE! 505!! steal all the credit!!! I DID IT FIRST!! LOL....just it somehow works for you.:wtf:

I tried 505's trick on the stock IC pipes and BPV. I gave the wastegate a dedicated vacuum line. I tried giving the BPV a dedicated line. I tried them both first with the MBC @ 8.5 psi, then at stock boost. No luck, still had the turkey. The only good thing out of the day was when the wastegate has it's own vacuum line, my MBC didn't spike as much. So not all was lost.

ya i didnt get anything different eather man.

 

[CustomMSP]

Awesome thread!! I gave the wastegate and the BPV dedicated lines as well. The "surge" is stll there. I have stock piping aside from a little extension attached to the MAF with a K&N filter on it. The BPV seems a little more responsive and louder, that's about it.

 

[jersey_emt]

Awesome thread!! I gave the wastegate and the BPV dedicated lines as well. The "surge" is stll there. I have stock piping aside from a little extension attached to the MAF with a K&N filter on it. The BPV seems a little more responsive and louder, that's about it.

How are you giving the wastegate AND the BPV dedicated lines?

FINE! 505!! steal all the credit!!! I DID IT FIRST!! LOL....just it somehow works for you.:wtf:
ya i didnt get anything different eather man.

Maybe with a little more experimentation, one of us can finally off the turkey with a single shot

 

[jersey_emt]

what'd you use as your source for the wastegate and bpv? and you're still using the stock bpv right? did you vent the stock bpv to atmosphere and cap the injen return tube? cause that return tube is awful small and is probably contributing to the problem....same with the inlet tube to the bpv. maybe you'll get a reduction in turkiness at least

The line that goes to the tee leading to the wastegate and the BPV...it heads back to the intake manifold. Pulled all of that off and ran a single hose from the mani to the wastegate. Then moved it to the BPV when it didn't work. I unhooked my boost gauge and used that tee to give the wastegate or the BPV (whatever wasn't on the dedicated line) a vacuum source. After I was done experimenting, I just found a new place to splice a tee in for the gauge (wanted to make sure I had no vacuum leaks).

I'm going to try running the stock BPV open vent tomorrow...I was going to do it today, but it was pouring, and I hate driving in the rain at night.

 

[WeldingHank]

get a larger by-pass. Probes like mine are easy to find. also can get them from mx6's. the by-pass outlets are a little larger than 1". should be able to get one for about $10. worth a try isn't it?

 

[CustomMSP]

Justin,
I lied there for a min. I only have one dedicated line like yours...sorry didn't realize that when I typed. I just tee'd off of the wastegate line for the boost gauge. Seems to run fine.

 

[jersey_emt]

Justin,
I lied there for a min. I only have one dedicated line like yours...sorry didn't realize that when I typed. I just tee'd off of the wastegate line for the boost gauge. Seems to run fine.

LOL no prob. But you are right, the stock BPV is louder with this setup...the turkey's still there, but there's an audible 'whoosh' (not loud but noticable) along with it.

 

[CustomMSP]

I couldn't really hear s*** over the rain and the wipers!!:mad: I'm at stock boost for now aswell. You said you're running 8.5psi? execuse me for threadjacking...

 

[jersey_emt]

Yeah, with the warmer weather this week I'm back up to around 9psi again.