dubcaps

Hey guys i have finally had it with my 10-5-5 boost pattern and i have decided to try to troubleshoot it today. I've found a few threads about this but i would really like to see some pictures of the wires or hoses that may have been crossed, and also the best way to access them. Any and all help will be appreciated.
-stephen

allrotor93

iTrader: (126)

i have got the same problem. i have my manifold off looking for problems. i had a problem with the idle too. i found a broken check valve toward the front but i have no idea what it will fix.

dubcaps

i know this is a little off subject, but allrotor93 are you going to go to the eastern rx-7 meet on oct 5? just wondering...
-stephen

johnchabin

iTrader: (2)

allrotor93: Which Check Valve? How was it broken (flowed both ways, leaking, clogged)?

If it's the one under the Pressure Chamber and leading to the Pressure Chamber, it can cause your Turbo Control Actuator to transition sluggishly.

Ralgh

What does it mean when I see #-#-# on these posts? I have seen it a lot. I have done no work or tinkering with the turbos on my car. Most of my time has been spent on suspension. Just curious.

Swamp RX-7

Well, your getting 10psi on the primary, so that rules out a boost leak on any of the intercooler hoses. But from looking at your boost pattern I would suspect the CRV hose(pop-off valve for second turbo) The little sucker is exposed to a lot of heat and splits easy. Just feel the hose, if it's hard a rock, replace it, it's junk. Next, check the hose leading to blow-off valve, same here, if it's hard, it's junk. Check all the check-valves, and pressure tank. These should be the first things you check, cuz you'll be pissed off when you take the UIM off just to find out you really didn't need to. Hope this helps. Good luck!

Swamp RX-7

It's the boost pattern for the FD. The first number represents the first turbos boost, the second is the boost at the transition(4500 RPMS) and the third is the second turbos boost. A stock FD should see this pattern...10-8-10.

Ralgh

Thanks. I just read an article on how the sequential turbos work. It is all starting to make sence to me now.

allrotor93

iTrader: (126)

the valve i replaced is a green and black one located under the black plastic box in front of the manifold. the damn thing just split in half. my CRV is vented to the atmosphere. is this a problem?
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dubcaps:
when and where is the meet?

Swamp RX-7

The check valve you are talking about holds pressure in the pressure tank(black placstic box) and it needs pressure to operate all the actuators, so, replace the check valve asap. Venting the CRV to the atmosphere is O.K., I do the same thing on mine.

Quickfini

iTrader: (6)

I've got the same problem as you guys..

I'm getting 10-5-5, but my boost keeps doing down and down so by redline, im only hitting about 2-3 psi..

I've checked the hoses coming off the CRV and i've checked the pressure/vacuum chambers and the check valves under them.. and can't seem to find anything wrong yet.. next step would be under the intake manifold?

Swamp RX-7

Thats the next step. Good luck!

johnchabin

iTrader: (2)

With this Check Valve split open, not only are you venting boost to the atmosphere, but you are never filling the Pressure Chamber. The Pressure Chamber has one function: to hold the pressure which is sent through the Turbo Control Solenoid when it opens at 4500 rpm to the Turbo Control Actuator, then rapidly opening the Turbo Control Valve.

No pressure in the Pressure Chamber means the other Turbo Control Solenoid (vacuum side) has to do the whole job of opening the Turbo Control Valve. That's where you get the sluggish response and the 10-5-5.

Good luck.

jspecracer7

I wonder how many non-sequential guys have problems with boost?

johnchabin

iTrader: (2)

Yeah, I suppose slightly more lag is better than 5 lbs on the second turbo.

I just might try for the hell of it.

pp13bnos

iTrader: (1)

I'm going non-seq. I was tired of running a boost pattern from 10-5-8, to a 14-10-13....other times it would run a 10-8-14. You never knew what to expect with my car. Kinda dissapointing when you take it down to the track and one run you blow off a 12.8@110, then a 13.7@100. I figured to heck with it...I'm going single, when funds allow it. Might as well get use to having the feel of a single, without the power. CJ

jspecracer7

LOL...how you figure? I drove don't be a rikki's FD...is car is FAST AS ****!...probably beating most of the T-04E single guys...

He's got full boost at 3200 rpm's...I SAW IT WITH MY OWN EYES.

pp13bnos

iTrader: (1)

Well, it seems as though, most people with stock ports, and no secret sauce usually get full boost from 4000-4,500. CJ

allrotor93

iTrader: (126)

lets all of us NC guys get together one day and all go non-seq!!!!!! that way i can do it with someone that knows what the f--- they are doing.

dubcaps

allrotor93 that would cool i suppose as long as i could reverse it, it would be worth a try. but i think lag would be horrible with my car being an auto, otherwise i say we go for it.
-stephen
the eastern NC rx-7/car meet. will be on october 5th. We will be meeting in b/w 10 and 11 pm at the "golfin dolfin" which is right before you get on the island (emerald isle) check the SE forum for details