HKS EVC V - dummy's guide required/ possible seq problem involved :(

[chris_bramley]

Hey all

 

After months of being too arsed off to care (and cycling to work) I have snapped and gone beserk at trying to get the supra 100% again.

 

I've been trying to plumb the EVC back in, but I can't work out, from the manual and from the various tips off here, exactly where everything goes. It;s all a bit too mish mash for me and so I'm appealing to anyone who has an HKS EVC V or similar that they plumbed in hose-wise from scratch to please give me an exact guide!

 

There are 3 nozzles on the solenoid - B, I and O. B is plumbed across to the ETCS, as it always has been, and the gauges come off that so I'm pretty sure that's fine.

 

The I comes off the top of the first turbo (discharge side) and is on a 3 piece connecting the vacuum pipe it would normally sit on and the solenoid, so all three of those are connected - I can't see a problem there either (according to the manual).

 

So.. the O one says it neesds connecting to the wastegate port. The wastegate is still connected to the turbo outlet underneath the first turbo, so I've connected the other port. Seems to make no difference.

 

Basically, with or without EVC, the car is making .5 bar on the first turbo; this drops to .35 -.4 when the second turbo comes in. the evc is the only boost solenoid present. I can FEEL the car wanting to give a lot more power, but it doesn't happen and that makes me sad.

 

If anyone can verify if this is a) the problem 2/problem 4 scenario Ian C mentions in the sequential checklist, and b) can give me a guide on exactly how to put the evc in, I'll be incredibly grateful.

 

Have replaced EVERY air hose (and most water while I was there), repeat EVERY, in the entire system trying to fix this. the engine bay is a riot of blue, my hands are weals of red, and my brain is melting out my ears.

 

Help!

 

[Ian C]

To be honest if it's gotten to this stage, I'd return the boost control system to stock and go from there You have too many variables and that will remove a good few of them.

 

-Ian

[chris_bramley]

Tried that Ian, same thing! I was trying to get the EVC back in to see if it made a difference - I dont' have the original boost solenoid in the car so didn't know if the car knew what boost it should be running? I reasonaed if it needed a solenoid at least the EVC would provide some help

 

the car's been plumbed as stock for ages and it's made no difference, same boost. Driving me nuts.

[chris_bramley]

I've now tried the TTC test with the vacuum hoses - still getting about .5 of a bar.

 

Would that not suggest it's the EGCV not opening? It's the only thing left I can think of. If so... how do I free it up?!

[chris_bramley]

Right. I'm convinced it's the EGCV. With a fiddle of the balancer box hoses and a bit of tinkering, the first turbo is hitting .6 bar and then it dumps everything and I get about .2 bar.

 

According to the wise Ian C's sequential checklist, and as this doesn't work in TTC, I guess this component is either sticking or faulty.

 

Can anyone give me a hint on

 

a) how to free it up and make it work

b) if not where I can get another egcv

and

c) how much for.

 

Cheers

[Ian C]

Removing it can be tricky as the bolts are heat- and rust-siezed on. If you can winkle it out from underneath then fitting a replacement and/or testing your one isn't that hard. Replacements are an arm and a leg from Toyota and peanuts 2nd hand.

 

-Ian

[chris_bramley]

The armature moves well enough if levered with a screwdriver, so if it's a problem it would be internal to the egcv I suppose - do these go wrong much? I'm sure getting it off won't cause much of an issue relative to recent work.

 

Any clue why the first turbo is running a lower bar than it should? (bpu bits and 1.4 hybrids mean it should be hitting at least 1 bar...)

 

anyone got a working one they can spare?

[Chris Wilson]

You must have been *uggering about with this for over a year now Chris, why not just take it to a specialist and get them to sort it, I can see you weaving baskets soon

[chris_bramley]

Ha, true enough Chris, but you have to understand I also have the worst luck in the world - redundancies, job losses, major ops where they broke half my face up and moved it around, debt, and a couple of other things keep getting in the way. If I'd had the money I'd have driven it to you at the start and left it!

 

Besides, I've learned a lot about the engine...

 

On that note, I've found using a bike pump of all things that the armature on the IACV AND the EGCV both work fine through air pressure. I'd guess that means they are ok... I'm SERIOUSLY considering just trying to finance a single turbo by now! more room, less to go wrong, easier to fix

[Chris Wilson]

Sorry you have had some bad luck, hop you are OK now. With great respect if you can't afford to get a stock set up fixed and working forget about going single. If you mechanically set the thing up to run NONE sequentially does it work OK? There are loads of places detailing how to do this. If it doesn't there is only one VSV that could still be the problem, e-mail me with the results when you have tried this. You DO have a decent mechanical boost gauge, don't you?

[chris_bramley]

I do indeed, and I'll be able to afford it soon - I'm about to start a new job. Every time I've saved money up it's vanished down a hole in the ground over the last year - 2007 wasn't the best for my car or my finances!

 

I've set the car up to run TTC style and taken the two vv's you are mentioning out of the equation, and the very front vsv that comes off the first turbo actuator I replaced with one you sent me ages ago, if that's the one you meant.

 

Either way, I'm getting under .5 bar of boost, seq or ttc. in seq it's about .5-.6 and then drops to .2. All hoses possible replaced. I'll drop this in a mail as well...

[chris_bramley]

I've been reading a VERY old thread on this concerning 6 supies doing similar things, and Chris, you mention the EBV or the EBV VSV being a possible culprit?

 

if the TTC mod takes the IACV and EGCV vsv's out of play, and the first turbo vsv is bypassed or seems ok... am I correct in thinking this is the only one left, and one that cannot be bypassed but MUST work?

 

I'm starting to see this system in my dreams, it seems tantalisingly close to working, almost.

 

Chris, email dropped to you with a list of what I've tried thus far. I guess there is more likely to be an issue with the EBV VSV than the EBV itself...

 

I've also driven and then taken the pressure line off the iacv vsv and had a pretty hefty PISH! of released air, so I'm fairly sure the pressure tank and related bits are ok.

 

Edit: This morning I bypassed the frontmost vsv entirely, same issue, and did a test where I bypassed the ebv vsv. Does this possibly mean it's the ebv (of all the parts to go wrong)?