Durandal

Just updating this in case someone stumbles across similar issues with the search function. After installing new inlet link pipes to the turbos and a new IACV VSV, the car seems to be working properly in sequential mode now. On down shifts both turbos kick in.

I've seen oil collect around there from the valve cover or a split vent hose from the valve cover/PCV system. In your pictures it looks like it has leaked all over that area. Could be residue from the intake coming out where your vac leak was as well.

That just looks like some oil as it is all over the connector as well. Possibly from the pipe above it?

I do remember reading through his posts and heard mention of him having a plan to tune the lean spot but couldn't find anything in search. I have fired him an email but I imagine he gets a ton of those haha. I will be swapping back to sequential soon which might help with the lean area in the 3600-3800 RPM range at 1 bar as in sequential there should only be 1 turbo active at that time.

Greddy EMU Will I be able to adjust the fueling in the 3500 RPM column or is the the stock ECU going to fight the changes?

It came off the IACV actuator. I'm just wondering if it's the original or someone replaced the original with this, as the part number don't match. Found another thread with the part numbers which mach mine so I guess the toyodiy number is just an anomaly http://www.mkivsupra.net/vbb/showthread.php?331442-VSV-part-numbers-please

While waiting for VSV to arrive I figured I'd check some other things No1 turbo pipe quite choked off. Probably why the No1 turbo always made a higher pitched noise. Do people bother replacing these with stock ones again or get a different style pipe coupling? I can probably get a some 2 inch hydraulic hose which I'm sure would hold up in the vacuum environment.

So according to toyodiy this is the part number that should should be the IACV VSV But this is what I took off my car. Looks more like the EGCV VSV part. Or are these basicly the same anyway?

Yah I am hoping that is the cause. Waiting for a quote on a replacement. Might order the EGCV VSV as well.

I had read that the IACV and EGCV open at around 0.5. I tested mine and they start to open at around 0.3 bar. Or was the 0.5 the pressure at which they are fully open?

This is the one for a 94 JDM according to toyodiy 89421A SENSOR, TURBO PRESSURE 89421-12111

Update re-checked some things again and it seems the IACV VSV is intermittently reading open so looks like a bad coil. So will need to order one of those and see if it fixes the problem. While testing EGCV VSV i also noticed the WG VSV is also bad although I am using a boost controller solenoid so that is not being used anyway.

So after searching I have found that several people have had the same issue I seem to be having. Boosts fine if you WOT in first or second and shift through gears but down shifting or very gradual ramp up of RPM yields low boost to around 0.4 bar then drops off at around 3800 RPM when the sequential stuff kicks in. I tested the IC piping with a can of spaghetti and ended up launching it across the garage. I've read through Ian C troubleshooting post and some others who have found split hoses. I bought a pressure/vacuum tester and manually tested all my actuators which seem to be working and used an ohm meter and 12 v supply on the VSV they all check out fine as well. So I put the car in TTC temporarily and it boosts great all the time when it is supposed to. The next day I checked and the EGCV and IACV actuators are still wide open so my pressure tank should be in good working order as well. Today I disconnected the hose marked with the pink arrow and used my hand pressure pump to build up to 1.1 bar. The EGBV opened and it very slowly dropped off to 0 bar (10 minutes or so). Felt around all the hoses fed from there and could not feel or hear any air leaking. Is that normal?

I disconnected the hose circled in red and blew into it down the direction of the arrow and it was free flowing. That's not right is it? Edit* Oops that just goes to the Y pipe, pulled that connection off and held my thumb on it so looks like no leaks in the EGBV.

So after installing the SCG-1 boost controller from innovate motorsports I am getting the common intermittent no second turbo on kick down and slow pulls. I'm going through all the hoses but all I have is silicon. Is there a hose kit from Toyota? Buying them all individually would cost a fortune. What a bugger trying to get at the 2 EGBV hoses as well.