Coming back from Michigan today and I had my Greddy Profec B Spec II set to about 9 PSI, boost didn't really kick in until 3k rpms (since I'm running the 19T, I get about 4 right away and then at 3k it jumps up) and AFRs were all good, never went above the low 11s WOT. Anyways, got through Chicago, and now I can barely get it above 5 psi. I didn't touch anything on it. I just check all my vac lines, they're all good, nothing out of place, I'm running a fmic, checked all the couplings, there are no rips or tears that would open up. I can get about 6 or 7 psi in 2nd, but other than that, it won't go above 5. I know the limp mode for the ECU is right around 4 or 5 psi, but the ECU isn't controlling boost. The limiter on the Greddy is set for 15psi and I never hit that. Other than that, the car doesn't feel any different off the line or up until 5 psi. I was really happy to have some boost again, and now I'm back to feeling like I have an NA.

Any thoughts would be greatly appreciated.

 

Sounds about like what happened to me last week when I blew a hole in an intercooler hose. Just wouldn't boost, but I knew it immediately and could hear the pressure leak. Now I'm Stylin but still trying to dial in the MBC

 

Yeah, I'm going to jack up the car this week and take a look at the intercooler couplers to see if anything is suspicious there, but since I'm running the fmic, I don't have a lot of places for a leak.

 

Well, I took my car for another test drive and when it was first warmed up, the car was driving great, I was hitting 10psi no problem, but about 15 mins in when I guess it was "more" warmed up, I went WOT in 3rd, got to 5psi and kind of stumbled, and after that I couldn't get it above 5 psi. Then like five mins later, I could barely boost at all. It was like the warmer everything got, the less I could boost. I wasn't able to hook my BCS back up because I don't have any vac line for the intake pipe, but I don't know if this would maybe be a new symptom of something else. And I don't know if it has anything to do with it, but my cooling fan kicked in several times and it's only 70 degrees out, it seems a bit much.

Thanks.

 

What do you have for a CBV? Maybe the spring? diaphragm? Because of the heat thing maybe the spring is a bit weak get hot loses some of its spring rate. Just an idea.

 

I thought about that. I've never heard of that happening before, but I guess it's a possibility. I'll check that out too when I get some more vac hose and can hook the BCS back up, that will rule out if it's the EBC or not.

 

found my problem. completely blew the hose from the IAC to the vac tree, didn't even think that was a hose that was at risk of blowing. I guess 10psi on the 19T was just too much for that hose. lol. POS.

 

I seem to remember reading over at MVS that someone blew that hose and it was difficult to find a replacement in silicone, which he wanted so it'd match the rest of the hoses.

I guess we want everything!

 

Yeah, they don't make a silicone hose for that, which kind of sucks, because besides the heater core firewall hoses and the expansion tank hose, it's the only rubber hose I have left in the bay.

 

Did you say expansion tank hose?

IPD had a silicone hose kit for the coolant system, but I can't find it on their website at the moment. Maybe it's out of stock, but I know they had one - it's how I learned that the coolant system had five hoses!

 

yeah, I know they have those hoses, but it's a kit, you can't just buy the expansion tank hoses. And I already have SAMCO radiator hoses.

 

quick question about all your vac hoses.
Did you get them as a kit from somewhere, or did you just buy the right sizes and piece it all together yourself?

 

Stylin' Motors sells a silicone kit for the vacuum hoses - they claim it's everything you need. It's on my wish list!

http://www.stylinmotors.com/volvo.html

 

Yeah, my hoses are from stylin. That kit that you get for your car is way more than enough to do all of your hoses, all the hose I got is actually left over from somebody else's kit.

 

All of my hoses are Stylin. Radiator, vacuum, and just recently intake. Like Gilber33 said the vacuum kit has tons of hose. Excellent product and service.

I sent them an email today requesting the IAC hose that also blew out on my car when the upper intercooler hose blew. We'll see if they come through with something.

 

I just got email from Stylin hoses and they are going to make the IAC to vacuum tree hose in reinforced silicone. I'm sending them my blown out one to use as a template.

So all who want one...send them and email and let them know.

As I said they offer a great product and personally I like the fact that they are made in the USA.

 

Did they mention anything about price or colors?

 

No not yet. I think they want to see the hose first. How much could it be it's so short

 

Hmm; four-inch hose with a 90 degree bend, 1 inch diameter, made of silicone? 50 bucks!