Rx7pimpin

I took my car out tonight, the boost was a perfect 12-8-12 and all the sudden I start getting 12-5-5. Any ideas what this might be. I do not see any loose vac. hoses.

Please help!!!

crazyrx7

Its probably your main cat. When the car is cold you get full boost but when the cat warms up it robs you of secondary boost. Thats if you have a main cat. What mods do you have done to your car?

Rx7pimpin

Thanks for the input, but I don't think it is the main cat because it has been running perfect even at normal operating temps. I took it out this morning and the same thing happenend 12-5-5 and it sounds like the BOV is staying open when the second turbo kicks in.

Any and all help is appriecated even if just minor trouble shooting..

Thanks

johnchabin

iTrader: (2)

See if the short 1" hose popped off the turbo side of the CRV.

Rx7pimpin

I looked and I did not see any hose popped off, which side is it on I am not sure which one it is.

My mods on the motor are: Boost controller, greddy FMIC, Koyo Rad, y-pipe,downpipe, catback, remapped ECU

Rx7pimpin

someone please tell me where the CRV is


If anyone has any other suggestions please let me know.

Flybye

Before I would start peaking around the hoses, I'd disconnect the boost controller from the system....

Then afterwards, I'd begin to look over each and every hose, and don't just do a visual. I'd pressure check each hose. Splits in hoses can sometimes only be seen under pressure. Pressure check the vacuum and the pressure tank. When I had my boost problem several years ago, it ended up being a broken nipple on the vacuum tank.

Rx7pimpin

Sorry for all the questions but I am still learning......

When I disconnect the boost controller where should I run the vacuum lines that I disconnect

Thanks

Rx7pimpin

Any other suggestions?

Rx7pimpin

bump

Batmobile

The CRV or Charge Relief Valve is on the backside of the Y-piping....it's like another butterfly that flaps open to allow into the secondary turbo....it looks like mini acuator...I hope that helps

Batmobile

Oops...there is a short vacuum hose that goes from the CRV to the intake...it should be about 2-3 inches long...I was at Cali.Speedway I did two runs and both of them suck...after the second run I stop and did some investigating...checked everything but that hose until a fellow FD owner reminded me to check and bam there it was, popped out! When this hose is popped out...the pimary turbo kicks in but at 5-6k rpm the car might get little or no boost.

rpm_pwr

pull your CRV hose off the airbox and go for a full throttle drive. I bet you it's not closing up at >4500. Double check the hose from the CRV to the manifold. If it's OK then:

Do a search for wargasm + hose diagram get his diagram print it. Your problem is the green from from the CRV. Pull of the strut brace, xover pipe and pressure chamber. Pull off the 2x10mm bolts that hold the wastegate+precontrol solenoids and pull the solenoids away. Behind that you'll see a group of horizontally stacked vacuum hoses. The top one will have blown off. Pop it back on and cable tie the ****** right there. Replace everything and boost away.

Job done

-pete

rpm_pwr

Oh yeah I should have added that if it's not the hose in the vertical stack then your stuffed. The feeder for this hose does dive out of reach at one stage so you have to pull off the whole UIM I'm afraid

-pete

johnchabin

iTrader: (2)

Well, the CRV (Charge Relief Valve) is really the plastic blow-off type valve (similar to the Air Bypass Valve). I think some of the above replies are talking about Charge Control.

I have seen a similar boost pattern when the hose I described in my earlier post popped off. It can also split easily, as it is attached to the y-pipe, and thus sees a lot of heat.

The clamps need to be tight enough so the hose doesn't spin around. It's actually quite easy to access. I made the hose red in the picture. This side of the CRV is under boost. Take off your upper intake hose (the fat ribbed one that goes from your airbox to the rear turbo) and you should be able to see it pretty well.

Good luck.

Rx7pimpin

Thanks for the input.......The hose is not popped off. all hoses seem to be attached properly. My CRV is already vented into the atmosphere. I guess I will now try some of the other options unless anyone has anything more.

Thanks

Rx7pimpin

How can I tell if it is closing up > 4500 it is already vented to the atmosphere.